drilling formulas calculation

Index PageDrilling Formula Spread Sheet V1.5Applied Drilling FormulasDrill Collar WeightEquivalent Circulating Density (ECD) Using Yield Point for MW less than or equal to 13 ppgEquivalent Circulating Density (ECD) Using Yield Point for MW more than 13 ppgLag timeLight weight spot fill to balance formation pressureLoss of hydrostatic pressure due to filling water into annulus in case of lost returnMargine of OverpullPipe Elongation Due to TemperaturePressure required to break circulationPump out (both duplex and triplex pump)Pump Pressure and Pump Stroke RelationshipStuck Pipe CalculationTon Miles CalculationBasic Drilling FormulasAccumulator capacityAmount of cuttings drilled per foot of hole drilledAnnular CapacityAnnular Velocity (AV)Buoyancy Factor (BF)Convert Temperature UnitConverting Pressure into Mud WeightDepth of washoutD-Exponent and D-Exponent CorrectedDisplacement of plain pipe such as casing, tubing, etc.Drilling Cost Per FootEquivalent Circulating Density (ECD)Formation Integrity Test (FIT)Formation TemperatureHow many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi)Hydrostatic Pressure (HP)Hydrostatic Pressure (HP) Decrease When POOHInner Capacity of open hole, inside cylindrical objectsLeak Off Test (LOT)Pressure and ForcePressure GradientSlug CalculationSpecific Gravity (SG)Total Bit Revolution in Mud MotorDirectional Drilling CalculationDirectional Survey - Angle Averaging MethodDirectional Survey - Radius of Curvature MethodDirectional Survey - Balanced Tangential MethodDirectional Survey - Minimum Curvature MethodDirectional Survey - Tangential MethodDogleg Severity Calculation based on Radius of Curvature MethodDogleg Severity Calculation based on Tangential MethodDrilling Fluid FormulasBulk Density of Cuttings by using Mud BalanceDecrease oil water ratioDetermine oil water ratio from a retort analysisDetermine the density of oil/water mixtureDilution to control LGSIncrease mud weight by adding BariteIncrease mud weight by adding Calcium CarbonateIncrease mud weight by adding HematiteIncrease oil water ratioMixing Fluids of Different Densities with Pit Space LimitationMixing Fluids of Different Densities without Pit Space LimitationReduce mud weight by dilutionEngineering FormulasAnnular Pressure LossCritical RPMCalculate Equivalent Circulating Density with Engineering FormulaHydraulic FormulasCritical Flow RateCutting Carrying IndexCutting Slip Velocity Method#1Cutting Slip Velocity Method#2Effective ViscosityHydraulic Horse Power (HPP)Optimum Flow Rate for basic systemPower Law ConstantPressure Loss AnnulusPressure Loss Annulus With Tool Joint CorrectionPressure Loss DrillstringPressure Loss Drillstring With Tool Joint CorrectionPressure Loss in Surface EquipmentReynold NumberSurge and Swab Pressure Method#1Surge and Swab Pressure Method#2Total Flow Area TableWell Control FormulasActual gas migration rate in a shut in wellAdjusted maximum allowable shut-in casing pressure for new mud weightCalculate Influx HeightEstimate gas migration rate with an empirical equationEstimate type of influxFormation pressure from kick analysisHydrostatic Pressure Loss Due to Gas Cut MudKick Tolerance (Surface Stack and Vertical Well)Kick tolerance factor (KTF)Kill Weight MudMaximum formation pressure (FP)Maximum influx heightMaximum Initial Shut-In Casing Pressure (MISICP)Maximum pit gain from gas kick in water based mudMaximum Surface Pressure from Gas Influx in Water Based MudMaximum surface pressure from kick tolerance informationTrip margin

Specific Gravity (SG)Converting Pressure into Mud WeightSlug CalculationHydrostatic Pressure (HP)Annular Velocity (AV)Pump out (both duplex and triplex pump)Buoyancy Factor (BF)Amount of cuttings drilled per foot of hole drilledPressure GradientConvert Temperature UnitBulk Density of Cuttings by using Mud BalanceHydrostatic Pressure (HP) Decrease When POOHDepth of washoutPressure and ForceAnnular Pressure LossCritical RPMCalculate Equivalent Circulating Density with Engineering FormulaFormation TemperatureHydraulic Horse Power (HPP)Pump Pressure and Pump Stroke RelationshipDrilling Cost Per FootInner Capacity of open hole, inside cylindrical objectsAnnular CapacityHow many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi)Accumulator capacityStuck Pipe CalculationDisplacement of plain pipe such as casing, tubing, etc.Loss of hydrostatic pressure due to filling water into annulus in case of lost returnLight weight spot fill to balance formation pressurePressure required to break circulationIncrease mud weight by adding BariteIncrease mud weight by adding Calcium CarbonateIncrease mud weight by adding HematiteReduce mud weight by dilutionDetermine the density of oil/water mixtureDetermine oil water ratio from a retort analysisIncrease oil water ratioDecrease oil water ratioDilution to control LGSD-Exponent and D-Exponent CorrectedTon Miles CalculationLag timeTrip marginKick tolerance factor (KTF)Maximum surface pressure from kick tolerance informationMaximum formation pressure (FP)Maximum Initial Shut-In Casing Pressure (MISICP)Maximum influx heightAdjusted maximum allowable shut-in casing pressure for new mud weightFormation pressure from kick analysisEstimate type of influxEstimate gas migration rate with an empirical equationEquivalent Circulating Density (ECD)Formation Integrity Test (FIT)Leak Off Test (LOT)Dogleg Severity Calculation based on Radius of Curvature MethodDogleg Severity Calculation based on Tangential MethodDirectional Survey - Angle Averaging MethodDirectional Survey - Radius of Curvature MethodDirectional Survey - Balanced Tangential MethodDirectional Survey - Minimum Curvature MethodDirectional Survey - Tangential MethodMixing Fluids of Different Densities with Pit Space LimitationMixing Fluids of Different Densities without Pit Space LimitationActual gas migration rate in a shut in wellKill Weight MudCalculate Influx HeightHydrostatic Pressure Loss Due to Gas Cut MudMaximum Surface Pressure from Gas Influx in Water Based MudMaximum pit gain from gas kick in water based mudCutting Slip Velocity Method#1Cutting Slip Velocity Method#2Surge and Swab Pressure Method#1Surge and Swab Pressure Method#2Total Flow Area TablePressure Loss DrillstringPressure Loss Drillstring With Tool Joint CorrectionPressure Loss AnnulusPressure Loss in Surface EquipmentEffective ViscosityPower Law ConstantReynold NumberCutting Carrying IndexCritical Flow RateOptimum Flow Rate for basic systemPressure Loss Annulus With Tool Joint CorrectionTotal Bit Revolution in Mud MotorEquivalent Circulating Density (ECD) Using Yield Point for MW less than or equal to 13 ppgEquivalent Circulating Density (ECD) Using Yield Point for MW more than 13 ppgPipe Elongation Due to TemperatureDrill Collar WeightMargine of OverpullKick Tolerance (Surface Stack and Vertical Well)

Kick ToleranceKick Tolerance (Surface Stack and Vertical Well)Input CellsPrevious Casing Shoe MD/TVD5,500ftCalculated CellTD depth MD/TVD9,500ftBack to the first pagePredicted Formation Pressure @ TD12.0ppgPore pressure uncertainty0.5ppgDo you want to have a good oilfield resume? Click Here !!!Planned MW @ TD12.0ppgGas gradient0.11psi/ftReferenceLeak Off Test at casing shoe14.7ppghttp://www.drillingformulas.com/kick-tolerance-concept-and-calculation-for-well-design/Hole size12.3inchDrill pipe size5.0inchAverage BHA size6.5inchBHA length850.0ftAnnular capacity between hole and BHA0.1047bbl/ftAnnular capacity between hole and DP0.1215bbl/ftMaximum anticipated pressure12.5ppgMaximum allowable shut in casing pressure772.2psiKick intensity0.50ppgUnderbalance247psiKick Height1,021.79ft1st case: Gas at the bottom109.89bbl2nd case: Gas at the shoe84.52bblKick Telerance84.52bbl

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Margin of OverpullDrill Collar WeightInput CellsMaximum Allowable Tensile Strenght300KlbCalculated CellHook Load100KlbBack to the first pageMargin of Overpull200ppgSafety Factor3.0Do you want to have a good oilfield resume? Click Here !!!Referencehttp://www.drillingformulas.com/margin-of-overpull-in-drillstring/

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Drill Collar WeightDrill Collar Weight Calculation To Prevent Drill Pipe BucklingVertical WellInput CellsCalculated CellWOB required50,000lbBack to the first pageSafety Factor25%Mud Weight12ppgBuoyancy Factor0.82Drill Collar Weight76,519lbDeviated WellDo you want to have a good oilfield resume? Click Here !!!WOB required50,000lbSafety Factor25%Mud Weight12ppgReferenceInclination30degreehttp://www.drillingformulas.com/drill-collar-weight-calculation-to-prevent-drill-pipe-buckling/Buoyancy Factor0.82Drill Collar Weight88,356lb

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Pipe Elongation TempPipe Elongation Due to TemperaturePipe Length10,000ftInput CellsSurface Temperature80FCalculated CellBottom Hole Temperature375FBack to the first pageAverage Temperature227.5FTemperature Difference147.5FReferencePipe Elongation122.43inchhttp://www.drillingformulas.com/drill-pipe-elongation-due-to-temperature/Do you want to have a good oilfield resume? Click Here !!!

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ECD Yp (2)Equivalent Circulating Density (ECD) Using Yield Point for MW more than 13 ppgMud weight13.5ppgInput CellsReading at 30025Calculated CellReading at 60040Back to the first pageHole ID6.2inchPipe OD4inchReferenceFlow rate200ppghttp://www.drillingformulas.com/equivalent-circulating-density-ecd-using-yield-point-for-mw-more-than-13-ppg/AV218.4ft/minPV15.0Do you want to have a good oilfield resume? Click Here !!!YP10CPEquivalent Circulating Density (ECD)14.2ppg

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ECD YpEquivalent Circulating Density (ECD) Using Yield Point for MW less than 13 ppgMud weight9.2ppgInput CellsReading at 30025Calculated CellReading at 60040Back to the first pageHole ID6.2inchPipe OD4inchReferenceYP10CPhttp://www.drillingformulas.com/equivalent-circulating-density-ecd-using-yield-point-for-mw-less-than-13-ppg/Equivalent Circulating Density (ECD)9.7ppgDo you want to have a good oilfield resume? Click Here !!!

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Total Bit RevolutionTotal Bit Revolution in Mud MotorRotor rpm0.2rev/gpmInput CellsFlow rate300gpmCalculated CellRotary rpm200rpmBack to the first pageTotal Bit Revolution in Mud Motor260rpmDo you want to have a good oilfield resume? Click Here !!!


Pressure drop across a bitPressure Drop Across a BitFlow rate800gpmInput CellsMud Weight9ppgCalculated CellTotal Flow Area0.3728in2Back to the first pagePressure Drop Across a Bit3446psiReferencehttp://www.drillingformulas.com/pressure-drop-across-a-bit/Do you want to have a good oilfield resume? Click Here !!!

Back to the first pageTotal Flow AreaDo you want to have a good oilfield resume? Click Here !!!http://www.drillingformulas.com/pressure-drop-across-a-bit/

Optimum Flow Rate-Basic SystemOptimum Flow Rate - Optimzed at The End of The RunHole Size8.500inchInput CellsDepth at TD6000ftCalculated CellMaxium Surface Pressure4500psiBack to the first pageMud properties at TDMW9.5ppgReferencePV14http://www.drillingformulas.com/determine-optimum-drilling-flow-rate-for-basic-system-drilling-hydraulics/YP113 rpm3Do you want to have a good oilfield resume? Click Here !!!300 rpm30600 rpm33inchDrill pipe OD5inchDrill pipe ID4.2inchTool Joint OD6.5inchTool Joint ID3.5inchDrill collar OD6.75inchDrill collar ID3.5inchLength of Drill Collar800See the table =>Cse (select)5Cpb0.0062434865B2.4Cpa0.0030826856Cp0.009326172Ccb0.016337Cca0.0165598294Cc0.032896Vf1.055788Optimum flow rateMaximum hydraulic horsepower702gpmMaximum Impact Force868gpm

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Critical Flow RateCritical Flow RatePower Law Constant, n0.51Input CellsPower Law Constant, K6.63Calculated CellMud Weight10ppgBack to the first pageHole Diameter (Dh)12.25inOD of pipe/collar (Do)5inReferenceCritical Annular Velocity3.82ft/sechttp://www.drillingformulas.com/critical-flow-rate-drilling-hydraulics/Critical Flow Rate1172gpmDo you want to have a good oilfield resume? Click Here !!!

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CCICutting Carrying IndexMud Weight9.2ppgInput CellsAnnular Velocity140ft/minCalculated CellPlastic viscosity17cpBack to the first pageYield Point15lbs/100 sq ftn0.61472ReferenceK353.71http://www.drillingformulas.com/cutting-carrying-index-simple-tool-to-determine-hole-cleaning/CCI1.14Hole cleaningGood Hole CleaningDo you want to have a good oilfield resume? Click Here !!!If CCI = 1 or greater, the hole cleaning is excellent.If CCI = 0.5 or less poor hole cleaning (expect hole problems).

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Reynold NumberReynold NumberAnnular Velocity6ft/secInput CellsHole Diameter8.5inchCalculated CellDrill pipe OD5inchBack to the first pageMud Weight9.5ppgEffective viscosity42.53centipoiseReferencePower Law Constant0.514http://www.drillingformulas.com/reynold-number-for-drilling-hydraulics/Reynold Number3,781Do you want to have a good oilfield resume? Click Here !!!

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Power Law ConstantPower Law ConstantInput CellsReading at 300 rpm32Calculated CellReading at 3 rpm3Back to Critical Flow Rate Calculationna0.514Back to the first pageKa6.628Referencehttp://www.drillingformulas.com/power-law-constants-n-and-k-calculation/Do you want to have a good oilfield resume? Click Here !!!

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Effective ViscosityEffective ViscosityKa6.629poiseInput Cellsna0.514Calculated CellDh8.5inchBack to the first pageDo5inchFlow rate800gpmReferenceAnnular Velocity7ft/sechttp://www.drillingformulas.com/effective-viscosity-calculation/Effective viscosity42.53centipoiseDo you want to have a good oilfield resume? Click Here !!!

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P loss surface equipmentPressure loss through surface equipmentGeneral coefficient for surface equipment (Cse)8See =>Mud Weight9.5ppgPlastic Viscosity12centipoiseFlow rate600gpmPressure loss through surface equipment155.0psiInput CellsCalculated CellBack to the first pageDo you want to have a good oilfield resume? Click Here !!!


P loss in annulus TJ correctionPressure loss in annulus with corrected coefficientInput CellsCalculated CellLength of drill pipe2500ftBack to the first pageOD of drill pipe5inchOD of drill pipe tool joint6inchLength of drill collar500ftOD of drill collar5inchHole size9inchMud Weight9.5ppgPlastic Viscosity12centipoiseFlow rate600gpmB parameter (see the table)2.4Do you want to have a good oilfield resume? Click Here !!!Coefficient for annulus around drillpipe and tool joint0.0017330143Coefficient for annulus around drill collar0.0016454082Pressure loss in the annulus around drill pipe63psiPressure loss in the annulus around drill collar12psiTotal Pressure loss in the annulus74psi


P loss in annulusPressure loss in annulusInput CellsCalculated CellLength of drill pipe/drill collar2500ftBack to the first pageOD of drill pipe/drill collar5inchHole size8.835inchMud Weight9.5ppgPlastic Viscosity12centipoiseFlow rate600gpmB parameter (see the table)2.4General coefficient0.0019118564Pressure loss in the annulus69psiDo you want to have a good oilfield resume? Click Here !!!


Ploss Drillstring TJ CorrectionPressure loss through the drill string with tool joint coefficientLength of drill pipe5000ftInput CellsID of drill pipe3.34inchCalculated CellTool joint ID of drill pipe2.563inchBack to the first pageLength of drill collar500ftID of drill collar2.8inchDo you want to have a good oilfield resume? Click Here !!!Mud Weight9.5ppgPlastic Viscosity12centipoiseFlow rate600gpmGeneral coefficient for drill pipe0.0204General coefficient for drill collar0.0483Pressure loss through the drill pipe1473psiPressure loss through the drill collar349psiTotal pressure in drill string1821psi


Pressure Loss DrillstringPressure loss through the drill stringLength of drill pipe5000ftInput CellsID of drill pipe3.34inchCalculated CellLength of drill collar500ftBack to the first pageID of drill collar2.8inchMud Weight9.5ppgDo you want to have a good oilfield resume? Click Here !!!Plastic Viscosity12centipoiseFlow rate600gpmGeneral coefficient for drill pipe0.0174General coefficient for drill collar0.0409Pressure loss through the drill pipe1254psiPressure loss through the drill collar295psiTotal pressure in drill string1549psi


TFA TableNozzle size (x/32)1Nozzle2Nozzles3Nozzles4Nozzles5Nozzles6Nozzles7Nozzles8Nozzles9Nozzles70.03760.07520.11270.15030.18790.22550.26310.30070.338280.04910.09820.14730.19630.24540.29450.34360.39270.441890.06210.12430.18640.24850.31060.37280.43490.49700.5591Back to the first page100.07670.15340.23010.30680.38350.46020.53690.61360.6903110.09280.18560.27840.37120.46400.55680.64960.74240.8353Do you want to have a good oilfield resume? Click Here !!!120.11040.22090.33130.44180.55220.66270.77310.88360.9940130.12960.25920.38890.51850.64810.77770.90731.03701.1666140.15030.30070.45100.60130.75170.90201.05231.20261.3530150.17260.34510.51770.69030.86291.03541.20801.38061.5532160.19630.39270.58900.78540.98171.17811.37441.57081.7671170.22170.44330.66500.88661.10831.33001.55161.77331.9949180.24850.49700.74550.99401.24251.49101.73951.98802.2365190.27690.55380.83071.10751.38441.66131.93822.21512.4920200.30680.61360.92041.22721.53401.84082.14762.45442.7612210.33820.67651.01471.35301.69122.02952.36772.70593.0442220.37120.74241.11371.48491.85612.22732.59862.96983.3410230.40570.81151.21721.62302.02872.43442.84023.24593.6516240.44180.88361.32541.76712.20892.65073.09253.53433.9761250.47940.95871.43811.91752.39682.87623.35563.83504.3143260.51851.03701.55552.07392.59243.11093.62944.14794.6664270.55911.11831.67742.23652.79573.35483.91404.47315.0322280.60131.20261.80402.40533.00663.60794.20924.81065.4119290.64501.29011.93512.58023.22523.87024.51535.16035.8054300.69031.38062.07092.76123.45154.14174.83205.52236.2126


Surge Swab 2Surge and swab pressure method#230085600130Input CellsHole diameter9.000inchCalculated CellDrillpipe diameter5inchBack to the first pageDrill collar diameter6.25inchAverage pipe running or pulling speed250ft/minReferenceDrill Pipe Length12000fthttp://www.drillingformulas.com/determine-surge-and-swab-pressure-method-2/Drill collar length800ftWebsiteCurrent Mud Weight12.5ppghttp://www.drillingformulas.com/Well TVD9000ftDo you want to have a good oilfield resume? Click Here !!!PV45n0.613K1.863Fluid Velocity (Closed Ended Pipe) around drill pipe224.1ft/minMaximum pipe velocity around drill pipe336.2ft/minShear rate of mud around drill pipe (Ym)201.7Shear stress of mud around drill pipe (T)48.1Fluid Velocity (Closed Ended Pipe) around drill collar345.4ft/minMaximum pipe velocity around drill collar518.0ft/minEquivalent flow rate around drill collar886.8gpmPressure lose around drill pipe480.5psiPressure loss around drill collar71.8psiTotal Pressure Loss552.2psiSurge: Bottom Hole Pressure6402.2psiSurge: Bottom Hole Pressure in ppg13.7ppgSwab: Bottom Hole Pressure5297.8psiSwab: Bottom Hole Pressure in ppg11.3ppg

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Surge Swab 1Surge and swab pressure method#130047Input Cells60080Calculated CellHole diameter6.35inchBack to the first pageDrill Collar5inchID of drill collar2.25inchReferenceDrillpipe diameter4inchhttp://www.drillingformulas.com/surge-and-swab-calculation-method-1/ID of drill pipe3.34inchWebsiteAverage pipe running or pulling speed20ft/minhttp://www.drillingformulas.com/Drill Pipe Length12270ftDrill Collar Length100ftDo you want to have a good oilfield resume? Click Here !!!Current Mud Weight13.2ppgWell TVD9972ftSelect Criteria --->Open Ended Pipen0.767K0.39400.00Fluid volocity around drill pipe (Open ended pipe)11.7ft/minMaximum pipe velocity around drill pipe17.6ft/minPressure Loss around drill pipe67.6psi00.00Fluid volocity around drill collar (Open ended pipe)28.6ft/minMaximum pipe velocity around drill collar42.8ft/minPressure Loss around drill collar2.9psiTotal pressure loss70.5psiSurge: Bottom Hole Pressure6915.3psiSurge: Bottom Hole Pressure in ppg13.3ppgSwab: Bottom Hole Pressure6774.3psiSwab: Bottom Hole Pressure in ppg13.1ppg

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Cutting Slip Velocity 2Cutting Slip Velocity Method#230032Input Cells60049Calculated CellFlow rate600gpmBack to the first pageHole diameter11.50inchDrillpipe Diameter5inchReferenceDiameter of cutting0.75inchhttp://www.drillingformulas.com/cutting-slip-velocity-calculation-method-2/Density of cutting21.5ppgWebsiteMud Weight9.2ppghttp://www.drillingformulas.com/n0.614Do you want to have a good oilfield resume? Click Here !!!K0.694Viscosity82.40cpAnnular Velocity137.1ft/minMoving UpCutting Slip Velocity76.93ft/minFalling DownNet cutting rise velocity60.1ft/minGood

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Cutting Slip Velocity 1Cutting Slip Velocity Method#1Flow rate600gpmInput CellsHole Diameter11.5inchCalculated CellDrillpipe OD5inchBack to the first pagePV17cpsMW9.2ppgReferenceDiameter of cutting0.75inchhttp://www.drillingformulas.com/cutting-slip-velocity-calculation-method-1/Density of cutting21.5ppgWebsitehttp://www.drillingformulas.com/Annular Velocity137.1ft/minMoving UpCutting Slip Velocity85.34ft/minFalling DownDo you want to have a good oilfield resume? Click Here !!!Net cutting rise velocity51.7ft/minGood

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Max Pit GainMaximum pit gain from gas kick in water based mudExpected formation pressure3620psiInput CellsPit volume gain20bblCalculated CellKill Weight Mud14.5ppgBack to the first pageAnnular Capacity0.1215bbl/ftMaximum pit gain98.5bblReferencehttp://www.drillingformulas.com/maximum-pit-gain-from-gas-kick-in-water-based-mud/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Max P gas influxMaximum Surface Pressure from Gas Influx in Water Based MudExpected formation pressure6378psiInput CellsPit volume gain25bblCalculated CellKill Weight Mud13ppgBack to the first pageAnnular Capacity0.0459bbl/ftMaximum Surface Pressure1344psiReferencehttp://www.drillingformulas.com/maximum-surf3ace-pressure-from-gas-influx-in-water-based-mud/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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HP loss gas cut mudHydrostatic Pressure Loss Due to Gas CutMud weight12ppgInput CellsAnnular Capacity0.0352bbl/ftCalculated CellPit volume gain15bblBack to the first pageHydrostatic Pressure Loss Due to Gas Cut266ftReferencehttp://www.drillingformulas.com/hydrostatic-pressure-loss-due-to-gas-cut-mud/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

Annular CapacityBack to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/hydrostatic-pressure-loss-due-to-gas-cut-mud/Do you want to have a good oilfield resume? Click Here !!!

Calculate Influx HeightCalculate Influx HeightPit volume gain12bblInput CellsAnnular Capacity0.0459bbl/ftCalculated CellInflux height261ftBack to the first pageReferencehttp://www.drillingformulas.com/calculate-influx-height/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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KWMKill Mud WeightShut in Drillpipe Pressure500psiInput CellsCurrent Mud Weight9.5ppgCalculated CellHole TVD9000ftBack to the first pageKill Mud Weight10.6ppgReferencehttp://www.drillingformulas.com/shut-down-pumps-weight-up-mud/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Acutal Gas Migration RateAcutal gas migration rateInput CellsIncrease in pressure200psi/hrCalculated CellMud Weight12ppgBack to the first pageAcutal gas migration rate321ft/hrReferencehttp://www.drillingformulas.com/determine-the-actual-gas-migration-rate/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Estimate gas migration rateEstimate gas migration rate with an empirical equation.Current Mud Weight12ppgInput cellsVg0.14ft/secCalculated cellsVg510ft/hrBack to the first pageReferencehttp://www.drillingformulas.com/estimate-gas-migration-rate-in-a-shut-in-well/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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type of influxEstimate Type of Influx (kick)Shut in casing pressure1050psiInput cellsShut in drill pipe pressure750psiCalculated cellsHeight of influx450ftBack to the first pageCurrent Mud Weight14ppgInflux weight1.2ppgReferenceType of influxGas Influxhttp://www.drillingformulas.com/estimate-type-of-influx-kick/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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formation pressure well shut inFormation Pressure from Kick AnalysisShut in drill pipe pressure550psiInput cellsHole TVD6000ftCalculated cellsCurrent Mud Weight10.2ppgBack to the first pageFormation Pressure3732psiReferencehttp://www.drillingformulas.com/formation-pressure-from-kick-analysis/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Adjusting MASCIPAdjusted maximum allowable shut-in casing pressure for new mud weightLeak off test pressure1000psiInput cellsCasing shoe TVD4500ftCalculated cellsOriginal Mud Weight9.5ppgBack to the first pageCurrent Mud Weight12ppgNew MASICP415psiReferencehttp://www.drillingformulas.com/adjusted-maximum-allowable-shut-in-casing-pressure/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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max influx heightMaximum possible influx height when equal to maximum allowable shut in casing pressureMaximum Allowable Shut-In Casing Pressure (MASICP)874psiInput cellsMud gradient0.52psi/ftCalculated cellsInflux gradient0.12psi/ftBack to the first pageMaximum possible influx height2185ftReferencehttp://www.drillingformulas.com/maximum-influx-height-to-equal-the-maximum-allowable-shut-in-casing-pressure/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Max shut in PressureMaximum Initial Shut-In Casing Pressure (MISICP)Input cellsCalculated cellsLeak off test pressure15ppgBack to the first pageCurrent mud weight12.2ppgCasing shoe depth4000ftReferenceMaximum allowable shut in casing pressure582.4psihttp://www.drillingformulas.com/maximum-initial-shut-in-casing-pressure-misicp/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Max formation pressMaximum formation pressure that can wistand when shut in the well.Kick tolerance factor1.68ppgInput cellsMud weight10ppgCalculated cellsHole TVD10000ftBack to the first pageMaximum formation pressure6,074psiReferencehttp://www.drillingformulas.com/maximum-formation-pressure-that-can-be-controlled-when-we-shut-the-well-in/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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max surface pressMaximum surface pressure from kick tolerance informationKick tolerance factor1.68ppgInput cellsBottom hole, TVD10000ftCalculated cellsMaximum pressure873.6psiBack to the first pageReferencehttp://www.drillingformulas.com/maximum-surface-pressure-from-kick-tolerance-factor/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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KTFKick tolerance factor (KTF)Casing shoe TVD4000ftInput cellsWell depth TVD10000ftCalculated cellsMaximum allowable mud weight14.2ppgBack to the first pageCurrent mud weight10ppgKick tolerance factor (KTF)1.68ppgReferencehttp://www.drillingformulas.com/kick-tolerance-factor-calculation/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Trip MarginTrip margin calculationInput cellsMud Yield Point10lb/100 sq ftCalculated cellsHole Diameter8.5inBack to the first pageDrillpipe Diameter4.5inTrip Margin0.2ppgReferencehttp://www.drillingformulas.com/trip-margin-calculation/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Lag TimeLag Time CalculationPump speed300GPMInput cellsPump Output0.102bbl/strokeCalculated cellsAnnular Volume250bblBack to the first pageLag time in minutes35minutesLag time in strokes2451strokesReferencehttp://www.drillingformulas.com/lag-time-for-drilling-business-and-how-to-calculate-theoretical-lag-time/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Ton MilesTon Mile CalculationRound-trip ton-mileMud Weight10ppgInput cellsMeasured depth (D)5500ftCalculated cellsDrillpipe weight13.3lb/ftBack to the first pagedrill collar weight85lb/ftDo you want to have a good oilfield resume? Click Here !!!drill collar length120ftHWDP weight49lb/ftHWDP length450ftWebsiteBHA weight in air8300lbhttp://www.drillingformulas.com/Length of BHA94ftBlock weight (Wb)95000lbAverage length of one stand (Lp)94ftBuoyancy factor0.847Buoyed weight of drill pipe (Wp)11.27lb/ftBuoyed weight of BHA (drill collar + heavy weight drill pipe + BHA) in mud minus the buoyed weight of the same length of drill pipe (Wc)26,876.24lbReferenceRound-trip ton-mile (RT TM)258.75Ton milehttp://www.drillingformulas.com/round-trip-ton-miles-calculation/Drilling or Connection Ton-milesTon-miles for one round trip of last depth before coming out of hole. (T2)230ton-milesTon-miles for one round trip of first depth that drilling is started. (T1)195ton-milesReferenceTon-miles for drilling (Td)105.00ton-mileshttp://www.drillingformulas.com/drilling-or-connection-ton-miles/Ton-miles for Coring OperationTon-miles for one round trip at depth where coring operation stopped before coming out of hole (T4)200ton-milesTon-miles for one round trip at depth where coring get started (T3)190ton-milesReferenceTon-miles for drilling (TC)20.00ton-mileshttp://www.drillingformulas.com/ton-miles-for-coring-operation/Ton-Miles for Setting CasingMud weight10ppgCasing weight25lb/ftDepht of casing set5200ftTravelling block weight95000lbLength of one joint of casing42ftBuoyancy factor0.847ReferenceTon-Miles for Setting Casing50.73ton-mileshttp://www.drillingformulas.com/ton-miles-for-setting-casing/Ton-Miles for Short TripTon-miles for one round trip at the deeper depth(T6)200ton-milesTon-miles for one round trip at the shallower depth (T5)190ton-milesReferenceTon-miles for drilling (TC)10.00ton-mileshttp://www.drillingformulas.com/ton-miles-while-making-short-trip/

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d exponentd ExponentRate of penetration (R)90f/hrInput cellsRotary drilling speed (N)110rpmCalculated cellsWeight on bit (W)20klbBack to the first pageBit Diameter (D)8.5inchReferenceD-exponent, dimensionless1.20http://www.drillingformulas.com/d-exponent-calculation/d Exponent CorrectedRate of penetration (R)90f/hrReferenceRotary drilling speed (N)110rpmhttp://www.drillingformulas.com/corrected-d-exponent/Weight on bit (W)20klbWebsiteBit Diameter (D)8.5inchhttp://www.drillingformulas.com/Initial mud weight in ppg (MW1)9ppgActual mud weight in ppg (MW2)12ppgDo you want to have a good oilfield resume? Click Here !!!D-exponent, dimensionless0.90

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Dilution LGS controlDilution to Control LGS1st case: Dilution by adding base fluid or waterInput cellsCalculated cellsTotal barrels of mud in circulating system1000Back to the first pagePercent low gravity solids in system6Do you want to have a good oilfield resume? Click Here !!!Percent total low gravity solids desired4ReferenceBarrels of dilution water or base fluid500.0http://www.drillingformulas.com/dilution-of-mud-system-to-control-low-gravity-solid/2nd case: Dilution by adding drilling fluidTotal barrels of mud in circulating system2000ReferencePercent low gravity solids in system7http://www.drillingformulas.com/dilution-of-mud-system-to-control-low-gravity-solid-by-adding-mud/Percent total low gravity solids desired3.5Percent low gravity solids bentonite and/or chemicals added in mud2WebsiteBarrels of dilution water or base fluid4666.7http://www.drillingformulas.com/

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Decrease oil water ratioDecrease oil water ratio% by volume oil56Input cells% by volume water14Calculated cells% by volume solids30Back to the first pageTotal mud volume, bbl300% original oil in liquid phase80%Reference% original water in liquid phase20%http://www.drillingformulas.com/decrease-oil-water-ratio/% new oil in liquip phase70Website% new water in liquid phase30http://www.drillingformulas.com/Water added per 100 bbl of original mud10.00bblTotal volume of water added into the system30.00bblDo you want to have a good oilfield resume? Click Here !!!

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Increase oil water ratioIncrease oil water ratio% by volume oil51Input cells% by volume water17Calculated cells% by volume solids32Back to the first page% original oil in liquid phase75%% original water in liquid phase25%Reference% new oil in liquip phase80http://www.drillingformulas.com/increase-oil-water-ratio/% new water in liquid phase20WebsiteOil added per 100 bbl of original mud17.00bblhttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Oil water ratioDetermine oil water ratio from a retort analysisInput cells% by volume oil56Calculated cells% by volume water14Back to the first page% by volume solids30% oil in liquid phase80%Reference% water in liquid phase20%http://www.drillingformulas.com/calculate-oil-water-ratio-from-retort-data/Oil/Water ratio80/20Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!


density of oil-water mixDetermine the density of oil/water mixtureInput cellsPercentage of oil80Calculated cellsPercentage of water20Back to the first pageDensity of oil7ppgDensity of water8.33ppgReferenceFinal density7.27ppghttp://www.drillingformulas.com/determine-the-density-of-oil-and-water-mixture/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!


Mix different density unlimitMix different fluid density: Case#2 unlimit spaceInput cellsMud Weight#110ppgCalculated cellsMud Weight#214ppgBack to the first pageVolume of Mud#1200bblVolume of Mud#2300bblReferenceTotal volume500bblhttp://www.drillingformulas.com/mixing-fluids-of-different-densities-without-pit-space-limitation/Final Mud Weight12.4ppgWebsitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Mix different density limitMix different fluid density: Case#1 limit spaceInput cellsMud Weight#110ppgCalculated cellsMud Weight#214ppgBack to the first pageFinal Mud Weight12ppgFinal Volume300bblReferenceVolume of Mud#1150bblhttp://www.drillingformulas.com/mixing-fluids-of-different-densities-pit-space-limitation/Volume of Mud#2150bblWebsitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Reduce mud weightReduce mud weight (dilution)Input cellsStrating volume (V1) in bbl200bblCalculated cellsStart drilling fluid weight in ppg (W1)13.8ppgBack to the first pageFinal drilling fluid weight in ppg (W2)10ppgDensity of light weight fluid in ppg (Dw)7.2ppgReferenceLight weight fluid required in bbl271.4bblhttp://www.drillingformulas.com/reduce-mud-weight-by-dilution/Websitehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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Mud Calculation-HematiteIncrease Mud Density by adding HematiteInput cellsCurrent Mud Weight, ppg10.0ppgCalculated cellsNew Mud Weight, ppg13.0ppgBack to the first pageTotal mud in the system500.0bblDo you want to have a good oilfield resume? Click Here !!!Sacks of Barite per 100 bbl of mud186.7sacksReferenceTotal sacks of barite required933.3sackshttp://www.drillingformulas.com/increase-mud-weight-by-adding-hematite/Volume of mud in bbl increase due to mud weight increase by adding HematiteCurrent Mud Weight, ppg10.0ppgNew Mud Weight, ppg13.0ppgTotal mud in the system500.0bblVolume in bbl increase per 100 bbl of mud11.11bblReferenceTotal volume increase in bbl55.56bblhttp://www.drillingformulas.com/volume-of-mud-increases-due-to-adding-hematite/Starting volume in bbl of original mud weight required to achieve a predetermined final volume of desired mud weight with HematiteCurrent Mud Weight in ppg10.0ppgNew Mud Weight in ppg13.0ppgFinal volume in bbl100.0bblReferenceStarting volume in bbl90.00bblhttp://www.drillingformulas.com/starting-volume-weight-up-with-hematite/

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Mud Calculation-CarbonateIncrease Mud Density by adding CarbonateInput cellsCurrent Mud Weight, ppg10.0ppgCalculated cellsNew Mud Weight, ppg13.0ppgBack to the first pageTotal mud in the system500.0bblDo you want to have a good oilfield resume? Click Here !!!Sacks of Barite per 100 bbl of mud298sacksReferenceTotal sacks of barite required1492sackshttp://www.drillingformulas.com/increase-mud-weight-by-adding-calcium-carbonate/Volume of mud in bbl increase due to mud weight increase by adding CarbonateCurrent Mud Weight, ppg10.0ppgNew Mud Weight, ppg13.0ppgTotal mud in the system500.0bblVolume in bbl increase per 100 bbl of mud31.58bblReferenceTotal volume increase in bbl157.89bblhttp://www.drillingformulas.com/volume-of-mud-increase-due-to-adding-calcium-carbonate/Starting volume in bbl of original mud weight required to achieve a predetermined final volume of desired mud weight with CarbonateCurrent Mud Weight in ppg10.0ppgNew Mud Weight in ppg13.0ppgFinal volume in bbl100.0bblReferenceStarting volume in bbl76.00bblhttp://www.drillingformulas.com/starting-volume-of-original-mud-weight-up-with-calcium-carbonate/

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Mud Calculation-BariteIncrease Mud Density by adding BariteInput cellsCurrent Mud Weight, ppg10.1ppgCalculated cellsNew Mud Weight, ppg11.1ppgBack to the first pageTotal mud in the system1000.0bblDo you want to have a good oilfield resume? Click Here !!!Sacks of Barite per 100 bbl of mud61.5sacksReferenceTotal sacks of barite required615.1sackshttp://www.drillingformulas.com/increase-mud-weight-by-adding-barite/Volume of mud in bbl increase due to mud weight increase by adding BariteCurrent Mud Weight, ppg9.2ppgNew Mud Weight, ppg10.1ppgTotal mud in the system650.0bblVolume in bbl increase per 100 bbl of mud3.61bblReferenceTotal volume increase in bbl23.49bblhttp://www.drillingformulas.com/volume-of-mud-increase-due-to-mud-weight-increase-by-adding-barite/Starting volume in bbl of original mud weight required to achieve a predetermined final volume of desired mud weight with BariteCurrent Mud Weight in ppg10.0ppgNew Mud Weight in ppg13.0ppgFinal volume in bbl100.0bblReferenceStarting volume in bbl88.00bblhttp://www.drillingformulas.com/starting-volume-of-original-mud-weight-up-with-barite/Websitehttp://www.drillingformulas.com/

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Pressure to break CCPressure required to break circulationPressure required overcoming the muds gel strength inside the drill string.Input cellsCalculated cells10 min get strenght of mud, lb/100 sq ft12lb/100 sq ftBack to the first pageInside diameter of drill pipe in inch3.32inDo you want to have a good oilfield resume? Click Here !!!Length of drill string in ft11500ftReferencePressure required to break circulation inside drill string138.6psihttp://www.drillingformulas.com/pressure-required-to-break-circulation-inside-drillstring/Pressure required overcoming the muds gel strength in the annulus.10 min get strenght of mud, lb/100 sq ft12lb/100 sq ftOutside diameter of drill pipe in inch4inReferenceHole diameter in inch6.5inhttp://www.drillingformulas.com/pressure-required-to-break-circulation-in-annlus/Length of drill string in ft11500ftWebsitePressure required to break circulation inside drill string184.0psihttp://www.drillingformulas.com/

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light weight spot pillLight weight spot fill to balance formation pressureInput cellsCurrent mud weight, ppg13ppgCalculated cellsOverblance with current mud weight, psi300psiBack to the first pageWeigth of light weight pill, ppg8.3ppgReferenceHeight of light weight pill, ft, in annulus1227fthttp://www.drillingformulas.com/determine-height-of-light-weight-spot-pill-to-balance-formation-pressure/Websitehttp://www.drillingformulas.com/You must ensure than height of light weight pill in the annulus must less than 1227 ft in order to prevent wellcontrol situation.Do you want to have a good oilfield resume? Click Here !!!

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Loss HP due to loss returnsLoss of hydrostatic pressure due to filling water into annulus in case of lost returnCurrent Mud Weight in ppg13ppgInput cellsWater Weight in ppg8.6ppgCalculated cellsTVD in ft6000ftBack to the first pageAnnular Capacity in bbl/ft0.1422bbl/ftDo you want to have a good oilfield resume? Click Here !!!Water filled into annulus in bbl140bblFeet of water in annuls984.5ftReferenceHydrostaic Pressure decrease225.3psihttp://www.drillingformulas.com/loss-of-hydrostatic-pressure-due-to-lost-return/Equivalent Mud Weigth at TD12.3ppgWebsitehttp://www.drillingformulas.com/

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DisplacementDisplacment of plain pipe such as casing, tubing, etc.OD9.625inchInput cellsID8.835inchcalculated cellsDisplacment in bbl/ft0.01417bbl/ftBack to the first pageDo you want to have a good oilfield resume? Click Here !!!Referencehttp://www.drillingformulas.com/pipe-displacement-calculation/Websitehttp://www.drillingformulas.com/


Sutck Pipe CalculationStuck Pipe CalculationStretch in inch5inchInput cellsFree point constant28634.51calculated cellsPull force in Klb100KlbBack to the first pageDepth of stuck pipe1431.73ftDo you want to have a good oilfield resume? Click Here !!!Free Point Constant (FPC) calculationOutside Diameter9.625inchInside Diameter8.835inchFPC28634.51Sutck Pipe Calculation (in case of not know Free Point Constant (FPC))ReferenceStretch in inch5inchhttp://www.drillingformulas.com/determine-how-many-feet-of-free-pipe/Pull force in Klb100Klbhttp://www.drillingformulas.com/determine-free-point-constant-fpc/Outside Diameter9.625inchhttp://www.drillingformulas.com/determine-how-many-feet-of-free-pipe-without-free-pipe-constant-table/Inside Diameter8.835inchDepth of stuck pipe1431.73ft

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accumulator capacityAccumulator CapacitySuface ApplicationInput cellsVolume per bottle10galcalculated cellsPre-charge pressure1000psiBack to the first pageMinimum System Pressure1200psiDo you want to have a good oilfield resume? Click Here !!!Operating Pressure3000psiReferenceUsable Volume per bottle5.00galhttp://www.drillingformulas.com/accumulator-capacity-usable-volume-per-bottle-calculation-surface-stack/Subsea ApplicationVolume per bottle10galPre-charge pressure1000psiMinimum System Pressure1200psiOperating Pressure3000psiReferencePressure gradient of hydraulic fluid0.445psi/fthttp://www.drillingformulas.com/accumulator-capacity-usable-volume-per-bottle-calculation-for-subsea-bop/Water depth1500ftWebsiteUsable Volume per bottle4.38galhttp://www.drillingformulas.com/

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Inner CapacityCalculate inner capacity of open hole, inside cylindrical objects such as tubulars, drill pipe, drill collars, tubing, casing etcCalculate capacity in bbl/ftInput cellsHole size, Casing ID, Tubing ID, etc6.125calculated cellsCapacity in bbl/ft0.0364Back to the first pageDo you want to have a good oilfield resume? Click Here !!!Calculate capacity in ft/bblHole size, Casing ID, Tubing ID, etc6.125ReferenceCapacity in ft/bbl27.4392http://www.drillingformulas.com/calculate-inner-capacity-of-open-holeinside-cylindrical-objects/WebsiteCalculate capacity in gal/fthttp://www.drillingformulas.com/Hole size, Casing ID, Tubing ID, etc6.125Capacity in gal/ft1.5306Calculate capacity in ft/galHole size, Casing ID, Tubing ID, etc6.125Capacity in ft/gal0.6533

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Annular CapacityAnnular capacity between casing or hole and drill pipe, tubing, or casing.Calculate annular capacity in bbl/ftInput cellsHole size, casing ID in inch8.5calculated cellsDrill pipe size, DC size or casing/tubing OD5Back to the first pageAnnular capacity, bbl/ft0.04590Do you want to have a good oilfield resume? Click Here !!!Calculate annular capacity in ft/bblHole size, casing ID in inch6.125ReferenceDrill pipe size, DC size or casing/tubing OD3.5http://www.drillingformulas.com/calculate-annular-capacityAnnular capacity, ft/bbl40.743Websitehttp://www.drillingformulas.com/Calculate annular capacity in gal/ftHole size, casing ID in inch6.125Drill pipe size, DC size or casing/tubing OD3.5Annular capacity, gal/ft1.031Calculate annular capacity in ft/galHole size, casing ID in inch6.125Drill pipe size, DC size or casing/tubing OD3.5Annular capacity, ft/gal0.970

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Cost Per FootCost Per Foot CalculationInput cellsBit cost (B), $27000calculated cellsRig cost (CR), $/hr3500Back to the first pageRotating time (t), hrs50Do you want to have a good oilfield resume? Click Here !!!Round trip time (T), hrs12ReferenceFootage per bit (F), ft5000http://www.drillingformulas.com/drilling-cost-per-foot/Cost per foot , $/ft48.80Websitehttp://www.drillingformulas.com/

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Pump Pressure and strokePump Pressure and Pump Stroke RelationshipBasic CalculationInput cellscalculated cellsCurrent Circulating Pressure, psi2500Back to the first pageOld Pump Rate, SPM40Do you want to have a good oilfield resume? Click Here !!!New Pump Rate, SPM25New Circulating Pressure, psi976.6Advanced calculation (Determine factor)Pressure 1, psi2700Flow rate1, gpm320Pressure 2, psi500Flow rate2, gpm130Factor1.872Current Circulating Pressure, psi2500ReferenceOld Pump Rate, SPM40http://www.drillingformulas.com/pump-pressure-and-pump-stroke-relationship/New Pump Rate, SPM25WebsiteNew Circulating Pressure, psi1037.0http://www.drillingformulas.com/

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Hydraulic Horse PowerHydraulic Horse Power (HPP)Circulating Pressure, psi3500Input cellsFlow rate, GPM800calculated cellsHydraulic Horse Power (HPP)1633.61Back to the first pageDo you want to have a good oilfield resume? Click Here !!!Referencehttp://www.drillingformulas.com/hydraulic-horse-power-calculatin/Websitehttp://www.drillingformulas.com/

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Formation TemperatureFormation TemperatureInput cellsSurface Temperature, F90calculated cellsTemperature Gradient, F/ft0.015Back to the first pageFormation Depth in TVD, ft12000Do you want to have a good oilfield resume? Click Here !!!Formation Temperature, F270Referencehttp://www.drillingformulas.com/formation-temperature/Websitehttp://www.drillingformulas.com/

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Critial RPMCritical RPM to prevent pipe failure due to high vibrationJust rough estimate 15% accurateInput cellscalculated cellsLength of one joint of drill pipe, ft32Back to the first pageOD of drill pipe, inch4Do you want to have a good oilfield resume? Click Here !!!ID of drill pipe, inch3.5ReferenceCritical RPM172http://www.drillingformulas.com/critical-rpm-to-avoid-excessive-vibration/Websitehttp://www.drillingformulas.com/

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ECD CalculationCalculate Equivalent Circulating Density with Engineering FormulaMud weight13.2Input cellsReading at 30047calculated cellsReading at 60080Back to the first pagePV33Do you want to have a good oilfield resume? Click Here !!!Pump rate, gpm165Hole diameter, in6.35Drill pipe OD, in4Drill pipe length, ft12276Drill collar OD, in5Drill collar length, ft100TVD, ft10000n0.767K0.394Annular velocity around DP, ft/min166.2Lamina FlowCritical velocity around DP, ft/min327.9Annular velocity around DC, ft/min263.8Lamina FlowCritical velocity around DC, ft/min462.9Pressure loss around DP378.5ReferencePressure loss around DC8.2http://www.drillingformulas.com/calculate-equivalent-circulation-density-ecd-with-complex-engineering-equations/Total annular pressure loss386.7WebsiteECD at 10000' TVD in ppg13.94http://www.drillingformulas.com/

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Annular Pressure LossAnnular Pressure LossMud Weight in ppg13.0Input cellsLength in ft8000.0calculated cellsFlow rate in GPM320.0Back to the first pageDh, in6.50Dp, in4.00Referencevelocity, ft/min298.7http://www.drillingformulas.com/calcuate-annular-pressure-loss/P loss annular in psi531.65Websitehttp://www.drillingformulas.com/

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Angle Averaing MethodDirecional Survey CalculationAngle Averaging MethodInput cellsSurvey1Survey2calculated cellsDepth (ft)74827782Back to the first pageInclination (degree)48Do you want to have a good oilfield resume? Click Here !!!Azimuth (degree)1035North28.97ftReferenceEast12.00fthttp://www.drillingformulas.com/angle-averaging-method-in-directional-drilling-calculation/Vertical298.36ftWebsitehttp://www.drillingformulas.com/

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Radius of Curvature MethodDirecional Survey CalculationRadius of Curvature MethodInput cellsSurvey1Survey2calculated cellsDepth (ft)74827782Back to the first pageInclination (degree)48Do you want to have a good oilfield resume? Click Here !!!Azimuth (degree)1035ReferenceNorth28.74fthttp://www.drillingformulas.com/radius-of-curvature-method/East11.90ftWebsiteVertical298.30fthttp://www.drillingformulas.com/

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Balanced Tangential MethodDirecional Survey CalculationBalanced Tangential MethodInput cellsSurvey1Survey2calculated cellsDepth (ft)35003600Back to the first pageInclination (degree)1525Do you want to have a good oilfield resume? Click Here !!!Azimuth (degree)2045ReferenceNorth27.10fthttp://www.drillingformulas.com/balanced-tangential-method-calculation/East19.37ftWebsiteVertical93.61fthttp://www.drillingformulas.com/

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Minimum Curvature MethodDirecional Survey CalculationMinimum Curvature MethodInput cellscalculated cellsSurvey1Survey2Back to the first pageDepth (ft)35003600Do you want to have a good oilfield resume? Click Here !!!Inclination (degree)15.0025.00Azimuth (degree)20.0045.000.22605radiansReferenceRF1.00428http://www.drillingformulas.com/minimum-curvature-method/North27.22ftWebsiteEast19.45fthttp://www.drillingformulas.com/Vertical94.01ft

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Tangential MethodDirecional Survey CalculationTangential MethodInput cellsSurvey1Survey2calculated cellsDepth (ft)35003600Back to the first pageInclination (degree)15.0025.00Do you want to have a good oilfield resume? Click Here !!!Azimuth (degree)20.0045.00ReferenceNorth29.88fthttp://www.drillingformulas.com/tangential-method-calculation/East29.88ftWebsiteVertical90.63fthttp://www.drillingformulas.com/


Dogleg Radius CCalculate dogleg severity between 2 survey points based on Radius of Curvature MethodSurvey1Survey2Depth (ft)42314262Input cellsInclination (degree)13.514.7calculated cellsAzimuth (degree)1019Back to the first pageDo you want to have a good oilfield resume? Click Here !!!Dogleg severity8.05degree/100 ftReferencehttp://www.drillingformulas.com/dogleg-severity-calculationbased-on-radius-of-curvature-method/Websitehttp://www.drillingformulas.com/

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Dogleg TangentCalculate dogleg severity between 2 survey points based on tangential methodSurvey1Survey2Input cellsDepth (ft)42314262calculated cellsInclination (degree)13.514.7Back to the first pageAzimuth (degree)1019Do you want to have a good oilfield resume? Click Here !!!ReferenceDogleg severity3.23degree/100 fthttp://www.drillingformulas.com/dogleg-severity-calculation-based-on-tangential-method/Websitehttp://www.drillingformulas.com/

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Pressure and forceDetermine force with given pressure and areaPressure500psiInput cellsArea3in2calculated cellsForce1500lbBack to the first pageDo you want to have a good oilfield resume? Click Here !!!orDetermine force with given pressure and diameterReferencePressure500psihttp://www.drillingformulas.com/pressure-and-force-relationship-and-applications/Diameter3inWebsiteForce3534.3lbhttp://www.drillingformulas.com/

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LOTLeak Off Test Pressure Converted to Equivalent Mud Weight (LOT)LOT pressure (psi)1600psiInput cellsMud Weight (ppg)9.2ppgcalculated cellsShoe Depth (TVD)4000ftBack to the first pageLOT equivalent mud weight16.9ppgDo you want to have a good oilfield resume? Click Here !!!Referencehttp://www.drillingformulas.com/leak-off-test-procedures-and-calcuation-2/Websitehttp://www.drillingformulas.com/

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FITPressure Required Formation Integrity Test (FIT)FIT required (ppg)14.5ppgInput cellsMud Weight (ppg)9.2ppgcalculated cellsShoe Depth (TVD)4000ftBack to the first pagePressure required (psi)1102.4Do you want to have a good oilfield resume? Click Here !!!Referencehttp://www.drillingformulas.com/formation-integrity-test-fit/Websitehttp://www.drillingformulas.com/

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ECDEquivalent Circulating Density (ECD), ppgAnnular pressure loss(psi)400psiInput cellsMud weight (ppg)10ppgcalculated cellsTVD (ft)8000ftBack to the first pageECD11.0PPGDo you want to have a good oilfield resume? Click Here !!!Referencehttp://www.drillingformulas.com/equivalent-circulating-density-ecd-in-ppg/Websitehttp://www.drillingformulas.com/

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Specific Gravity (SG)Specific Gravity (SG)Specific gravity using mud weight, ppgInput cellsMud weight (ppg)13ppgcalculated cellsSG1.56Back to the first pageSpecific gravity using pressure gradient, psi/ftDo you want to have a good oilfield resume? Click Here !!!Pressure gradient (psi/ft)0.50psi/ftWebsiteSG1.15http://www.drillingformulas.com/Specific gravity using mud weight, lb/ft3ReferenceMud weight (lb/ft3)90.00lb/ft3http://www.drillingformulas.com/calculate-specific-gravity-sg-in-oilfield-unit/SG1.44Convert specific gravity to mud weight, ppgSG1.50ReferenceMW (ppg)12.50ppghttp://www.drillingformulas.com/convert-specific-gravity-to-mud-weight-ppg-and-lbft3-and-pressure-gradient-psift/Convert specific gravity to pressure gradient, psi/ftSG1.50Pressure Gradient (psi/ft)0.650psi/ftConvert specific gravity to mud weight, lb/ft3SG1.50Mud weight (lb/ft3)93.600lb/ft3

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Pressure to MWConverting Pressure into Mud WeightConvert pressure, psi, into mud weight, ppg using feet as the unit of measureInput cellsPressure (psi)5000psicalculated cellsTVD (ft)8000ftBack to the first pageMW (ppg)12.0PPGDo you want to have a good oilfield resume? Click Here !!!Convert pressure, psi, into mud weight, ppg using meters as the unit of measureReferencePressure (psi)5000psihttp://www.drillingformulas.com/convert-pressure-into-equivalent-mud-weight/TVD (m)2500mWebsiteMW (ppg)11.7PPGhttp://www.drillingformulas.com/

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Slug CalculationBarrels of slug required for a desired length of dry pipeDesired length of dry pipe (ft)400ftInput cellsDrill pipe capacity (bbl/ft)0.015bbl/ftcalculated cellsCurrent MW (PPG)11.5ppgBack to the first pageSlug Weight (PPG)12.5ppgDo you want to have a good oilfield resume? Click Here !!!Hydrostatic pressure required to give desired drop inside drill pipe239.2psiWebsiteDifference in pressure gradient bw slug and current MW0.052psi/fthttp://www.drillingformulas.com/Length of slug in drill pipe (ft)4600ftReferenceSlug Volume69.00bblhttp://www.drillingformulas.com/barrels-of-slug-required-for-desired-length-of-dry-pipe/Weight of slug required for a desired length of dry pipe with a set volume of slugDesired length of dry pipe (ft)400ftSlug Volume (bbl)30bblDrill pipe capacity (bbl/ft)0.015bbl/ftCurrent MW (PPG)11.5ppgSlug length (ft)2000.0ftHydrostatic Pressure required (psi)239.2psiReferenceWeight of slug (PPG)13.8ppghttp://www.drillingformulas.com/weight-of-slug-required-for-desired-length-of-dry-pipe-with-set-volume-of-slug/

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Hydrostatic Pressure (HP)Hydrostatic Pressure (HP)Hydrostatic pressure using ppg and feet as the units of measureMud weight12ppgInput cellsTVD (ft)10000ftcalculated cellsHydrostatic Pressure (psi)6240.0psiBack to the first pageHydrostatic pressure, psi, using pressure gradient, psi/ftDo you want to have a good oilfield resume? Click Here !!!Pressure gradient (psi/ft)0.5psi/ftReferenceTVD (ft)10000fthttp://www.drillingformulas.com/hydrostatic-pressure-calculation/Hydrostatic Pressure (psi)5000.0psiWebsiteHydrostatic pressure, psi, using mud weight, lb/ft3http://www.drillingformulas.com/Mud weight (lb/ft3)80lb/ft3TVD (ft)10000ftHydrostatic Pressure (psi)5555.2psiHydrostatic pressure, psi, using meters as unit of depthMud weight12ppgTVD (m)5000mHydrostatic Pressure (psi)10236.7psi


Annular Velocity (AV)Annular Velocity (AV) in ft/minFormula 1: AV = pump output, bbl/min annular capacity, bbl/ftPump out put (bbl/min)10bbl/minInput cellsAnnular capacity (bbl/ft)0.13bbl/ftcalculated cellsAnnular Velocity (AV)76.92ft/minBack to the first pageFormula 2: Flow rate in gpm and diameter between 2 diametersDo you want to have a good oilfield resume? Click Here !!!Flow rate (gpm)800gpmBigger diameter (in)10insuch as hole size, casing ID, etcReferenceSmaller diameter (in)5insuch as drill pipe OD, tubing OD, etchttp://www.drillingformulas.com/annular-velocity-calculation/Annular Velocity (AV)261.33ft/minWebsiteFormula 3: flow rate in bbl/min and diameterhttp://www.drillingformulas.com/Flow rate (bbl/min)13bbl/minBigger diameter (in)10insuch as hole size, casing ID, etcSmaller diameter (in)5insuch as drill pipe OD, tubing OD, etcAnnular Velocity (AV)178.43ft/minAnnular velocity (AV), ft/secFormula 1: Flow rate in bbl/min and diameter between 2 diametersFlow rate (bbl/min)13bbl/minBigger diameter (in)10inSmaller diameter (in)5inAnnular Velocity (AV)2.97ft/secPump output in gpm required for a desired annular velocity, ft/mimAnnular Velocity (ft/min)120ft/minBigger diameter (in)10inSmaller diameter (in)5inRequired pump rate (gpm)367.35gpmStrokes per minute (SPM) required for a given annular velocityAnnular Velocity (ft/min)150ft/minBigger diameter (in)10inSmaller diameter (in)5inPump out put (bbl/stk)0.1bbl/stkSPM required109.29spm

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Pump OutPump outTriplex Pump, bbl/stkInput cellsefficiency (%)97calculated cellsLiner diameter (in)6inBack to the first pageStroke length (in)12inDo you want to have a good oilfield resume? Click Here !!!PO (bbl/stk)0.10183bbl/stkDuplex Pump , bbl/stkefficiency (%)85Liner diameter (in)6inReferenceRod diameter (in)2inhttp://www.drillingformulas.com/pump-output-calculation-for-duplex-pump-and-triplex-pump/Stroke length (in)12inWebsitePO (bbl/stk)0.11236bbl/stkhttp://www.drillingformulas.com/

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Bouyancy FactorBuoyancy Factor (BF)Buoyancy factor using mud weight, PPGInput cellsMW (PPG)13calculated cellsBF0.802Back to the first pageDo you want to have a good oilfield resume? Click Here !!!Buoyancy factor using mud weight, lb/ft3ReferenceMW (lb/ft3)100http://www.drillingformulas.com/buoyancy-factor-calculation/BF0.796Websitehttp://www.drillingformulas.com/

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Amount of cutting drilledAmount of cuttings drilled per foot of hole drilleda) BARRELS of cuttings drilled per foot of hole drilled:Porosity(%)25Input cellsHole diameter (in)6.125calculated cellsBBL/ft0.0273331249bbl/footage drilledBack to the first pageb) CUBIC FEET of cuttings drilled per foot of hole drilled:Do you want to have a good oilfield resume? Click Here !!!Porosity(%)25Hole diameter (in)6.125cu-ft/ft0.1534623535cu.ft/footage drilledReferencec) Total solids generated:http://www.drillingformulas.com/amount-of-cuttings-total-solid-generated/Hole diameter (in)6.125WebsiteHole capacity (bbl/ft)0.0364441665http://www.drillingformulas.com/Footage drilled (ft)100Porosity(%)25Cutting Density (gm/cc)2.2Solid generated(pounds)2104.6506156499pound

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Pressure GradientPressure Gradient CalculationPressure gradient, psi/ft, using mud weight, ppgMW (ppg)9PPGInput cellsPressure gradient (psi/ft)0.468psi/ftcalculated cellsPressure gradient, psi/ft, using mud weight, lb/ft3Back to the first pageMW (lb/ft3)80lb/ft3Do you want to have a good oilfield resume? Click Here !!!Pressure gradient (psi/ft)0.556psi/ftPressure gradient, psi/ft, using mud weight, specific gravity (SG)ReferenceMW sg2http://www.drillingformulas.com/calculate-pressure-gradient/Pressure gradient (psi/ft)0.866psi/ftWebsiteConvert pressure gradient, psi/ft, to mud weight, ppghttp://www.drillingformulas.com/Pressure gradient (psi/ft)0.5psi/ftMW (ppg)9.62PPGConvert pressure gradient, psi/ft, to mud weight, lb/ft3Pressure gradient (psi/ft)0.5psi/ftMW (ppg)72.00lb/ft3Convert pressure gradient, psi/ft, to mud weight specific gravity (SG)Pressure gradient (psi/ft)0.5psi/ftSpecific Gravity1.155

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Temp ConvertConvert temperature, Fahrenheit (F) to Celsius (C)F347Input cellsC175.0calculated cellsBack to the first pageConvert temperature, Celsius (C) to FahrenheitDo you want to have a good oilfield resume? Click Here !!!C26.667F80.0Referencehttp://www.drillingformulas.com/temperature-conversion-formulas/Convert temperature, Celsius (C) to Kelvin (K)WebsiteC23http://www.drillingformulas.com/K296.2Convert temperature, Fahrenheit (F) to Rankine (R)F150R609.7

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Accumulator pressureAccumulator Pre-charge PressureP start3000Input cellsP final2000calculated cellsVolume removed25Back to the first pageVolume total200Do you want to have a good oilfield resume? Click Here !!!Average pre charge pressure750


Bulk Density CalculationBulk Density of Cuttings by using Mud BalanceProcedure to obtain RW:Input cells1. Cuttings must be washed free of mud. In oil base mud, diesel oil can be used instead of water.calculated cells2. Set mud balance at 8.33 ppg.Back to the first page3. Fill the mud balance with cuttings until a balance is obtained with the lid in place.Do you want to have a good oilfield resume? Click Here !!!4. Remove lid, fill cup with water (cuttings included), replace lid, and dry outside of mud balance.Reference5. Move counterweight to obtain new balance. This value is Rw = resulting weight with cuttings plus water, ppg.http://www.drillingformulas.com/bulk-density-cuttings-using-mud-balance/WebsiteRW, ppg14http://www.drillingformulas.com/SG3.13

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ft pulled to lose HPHow many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi) when pull dry.Hydrostatic pressure to lose200psiCasing capacity0.0873bbl/ftInput cellsPipe displacement0.01876bbl/ftcalculated cellsMud weight12PPGBack to the first pageFeet of drill pipe pulled1171ftDo you want to have a good oilfield resume? Click Here !!!How many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi) when pull wet.% of volume in drill pipe out of hole100%Hydrostatic pressure to lose200psiPipe displacement0.0055bbl/ftReferencePipe capacity0.01876bbl/fthttp://www.drillingformulas.com/drill-pipe-pulled-to-lose-hydrostatic-pressure/Casing capacity0.0873bbl/ftWebsiteMud Weight12PPGhttp://www.drillingformulas.com/Feet of drill pipe pulled833ft


HP decrease w POOHHydrostatic Pressure (HP) Decrease When POOHWhen pulling DRY pipeInput cellsStands pulled10standscalculated cellsLength per stand91ftBack to the first pagePipe displacement0.0055bbl/ftDo you want to have a good oilfield resume? Click Here !!!Casing capacity0.0873bbl/ftMud Weight12PPGReferenceBBL displace5.01bblhttp://www.drillingformulas.com/hydrostatic-pressure-decrease-when-pooh/HP decrease (psi)38.18psiWebsitehttp://www.drillingformulas.com/When pulling WET pipe% of volume in drill pipe out of hole100Stands pulled10standsLength per stand91ftPipe displacement0.0055bbl/ftPipe capacity0.01876bbl/ftCasing capacity0.0873bbl/ftMud Weight12.0PPGBBL displace22.08bblHP decrease (psi)218.52Psi


Depth of WashoutDepth of washoutMethod 1:The concept of this method is to pump plugging material to plug the wash out. We will know how many stroks pump till pressure increase then we can calculate back where the washout is.Strokes pumped till pressure increase400strokesInput cellsInternal capacity of drill pipe0.00742bbl/ftcalculated cellsPump output0.0855bbl/stkBack to the first pageDepth of washout4609ftDo you want to have a good oilfield resume? Click Here !!!Method 2:The concept of this method is to pump material that can be easily observed from drill pipe pass through wash out into annulus and over the surface. We can calculate the depth of washout bases on the combination volume of internal drill pipe volume and annulus volume.Strokes pumped till material seen2500strokesInternal capacity of drill pipe0.00742bbl/ftAnnulus capacity0.0455bbl/ftReferencePump output0.0855bbl/stkhttp://www.drillingformulas.com/depth-of-washout/Volume from bell nipple to shale shakers10bblWebsiteDepth of washout3850fthttp://www.drillingformulas.com/


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