well control formulas drillingformulas.com 1

Index PageWell Control and Related FormulasBasic FormulasAnnular CapacityAnnular Velocity (AV)Converting Pressure into Mud WeightDisplacement of plain pipe such as casing, tubing, etc.How many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi)Hydrostatic Pressure (HP) CalculationHydrostatic Pressure (HP) Decrease When POOHInner Capacity of open hole, inside cylindrical objectsPressure GradientSlug CalculationSpecific Gravity (SG)PumpPump out (both duplex and triplex pump)Pump Pressure and Pump Stroke RelationshipFIT/LOTFormation Integrity Test (FIT)Leak Off Test (LOT)Weight UpIncrease mud weight by adding BariteIncrease mud weight by adding Calcium CarbonateIncrease mud weight by adding HematiteEquivalent Circulating DensityEquivalent Circulating Density (ECD)Equivalent 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 ppgCalculate Equivalent Circulating Density with Engineering FormulaSurge and SwabSurge and Swab Pressure Method#1Surge and Swab Pressure Method#2Well Control FormulasAccumulator capacityActual 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 influxFinal Circulating Pressure (FCP)Formation pressure from kick analysisHydrostatic Pressure Loss Due to Gas Cut MudInitial Circulating Pressure (ICP)Kick Tolerance (Surface Stack and Vertical Well)Kick tolerance factor (KTF)Kill Weight Mud (KWM)Maximum 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 informationNew Pressure Loss With New Mud (psi)New Pump Pressure With New Strokes (psi)Riser MarginTrip margin

Specific Gravity (SG)Converting Pressure into Mud WeightSlug CalculationHydrostatic Pressure (HP) CalculationAnnular Velocity (AV)Pump out (both duplex and triplex pump)Pressure GradientHydrostatic Pressure (HP) Decrease When POOHCalculate Equivalent Circulating Density with Engineering FormulaPump Pressure and Pump Stroke RelationshipInner Capacity of open hole, inside cylindrical objectsAnnular CapacityHow many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi)Accumulator capacityDisplacement of plain pipe such as casing, tubing, etc.Increase mud weight by adding BariteIncrease mud weight by adding Calcium CarbonateIncrease mud weight by adding HematiteTrip 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)Actual gas migration rate in a shut in wellKill Weight Mud (KWM)Calculate 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 mudSurge and Swab Pressure Method#1Surge and Swab Pressure Method#2Kick Tolerance (Surface Stack and Vertical Well)Equivalent 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 ppgInitial Circulating Pressure (ICP)Final Circulating Pressure (FCP)New Pump Pressure With New Strokes (psi)New Pressure Loss With New Mud (psi)Riser Margin

Riser MarginRiser MarginAir Gap60ftInput CellsWater Depth1,600ftCalculated CellMud Weight9.30ppgBack to the first pageSea Water Weight8.60ppgDepth (TVD)3,000ftRefRiser Margin1.25ppghttp://www.drillingformulas.com/riser-margin-one-of-important-concepts-for-deep-water-drilling/

Back to the first pagehttp://www.drillingformulas.com/riser-margin-one-of-important-concepts-for-deep-water-drilling/

New Pump PNew Pump Pressure With New Strokes (psi)Current Pressure1,600psiInput CellsSPM 170strks.Calculated CellSPM 2110strks.Back to the first pageNew Pump Pressure3,951psi

Back to the first page

New Pump P (2)New Pressure Loss With New Mud (psi)Original Pressure Loss1,400psiInput CellsMud Weight#111.50ppgCalculated CellMud Weight#212.50ppgBack to the first pageNew Pressure Loss1,522psi


FCPInitial Circulating Pressure (psi)Input CellsSCR Pressure450psiCalculated CellKill Mud Weight12.00ppgBack to the first pageOriginal Mud Weight10.00ppgFCP540psi


ICPInitial Circulating Pressure (psi)Input CellsSCR Pressure400psiCalculated CellSIDPP500psiBack to the first pageICP900psi


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

Back to the first pageDo you want to have a good oilfield resume? Click Here !!!http://www.drillingformulas.com/kick-tolerance-concept-and-calculation-for-well-design/

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

Back to the first pageDo you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pageDo you want to have a good oilfield resume? Click Here !!!http://www.drillingformulas.com/equivalent-circulating-density-ecd-using-yield-point-for-mw-less-than-13-ppg/

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/

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

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/determine-surge-and-swab-pressure-method-2/Do you want to have a good oilfield resume? Click Here !!!

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

Back to the first pagehttp://www.drillingformulas.com/surge-and-swab-calculation-method-1/http://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/Expected formation pressureKill Weight MudAnnular Capacityhttp://www.drillingformulas.com/maximum-pit-gain-from-gas-kick-in-water-based-mud/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/Expected formation pressureKill Weight MudAnnular Capacityhttp://www.drillingformulas.com/maximum-surf3ace-pressure-from-gas-influx-in-water-based-mud/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/calculate-influx-height/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/shut-down-pumps-weight-up-mud/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

http://www.drillingformulas.com/determine-the-actual-gas-migration-rate/http://www.drillingformulas.com/Back to the first pageDo you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/estimate-gas-migration-rate-in-a-shut-in-well/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/formation-pressure-from-kick-analysis/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/adjusted-maximum-allowable-shut-in-casing-pressure/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/maximum-influx-height-to-equal-the-maximum-allowable-shut-in-casing-pressure/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/maximum-initial-shut-in-casing-pressure-misicp/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/maximum-formation-pressure-that-can-be-controlled-when-we-shut-the-well-in/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/maximum-surface-pressure-from-kick-tolerance-factor/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/kick-tolerance-factor-calculation/Do you want to have a good oilfield resume? Click Here !!!

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 !!!

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/trip-margin-calculation/Do you want to have a good oilfield resume? Click Here !!!

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/

Back to the first pagehttp://www.drillingformulas.com/increase-mud-weight-by-adding-hematite/http://www.drillingformulas.com/volume-of-mud-increases-due-to-adding-hematite/http://www.drillingformulas.com/starting-volume-weight-up-with-hematite/Do you want to have a good oilfield resume? Click Here !!!

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/

Back to the first pagehttp://www.drillingformulas.com/increase-mud-weight-by-adding-calcium-carbonate/http://www.drillingformulas.com/volume-of-mud-increase-due-to-adding-calcium-carbonate/http://www.drillingformulas.com/starting-volume-of-original-mud-weight-up-with-calcium-carbonate/Do you want to have a good oilfield resume? Click Here !!!

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/

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/increase-mud-weight-by-adding-barite/http://www.drillingformulas.com/volume-of-mud-increase-due-to-mud-weight-increase-by-adding-barite/http://www.drillingformulas.com/starting-volume-of-original-mud-weight-up-with-barite/Do you want to have a good oilfield resume? Click Here !!!

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/


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/

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/accumulator-capacity-usable-volume-per-bottle-calculation-surface-stack/http://www.drillingformulas.com/accumulator-capacity-usable-volume-per-bottle-calculation-for-subsea-bop/Do you want to have a good oilfield resume? Click Here !!!

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

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/calculate-inner-capacity-of-open-holeinside-cylindrical-objects/Do you want to have a good oilfield resume? Click Here !!!

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

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/calculate-annular-capacityDo you want to have a good oilfield resume? Click Here !!!

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/

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/pump-pressure-and-pump-stroke-relationship/Do you want to have a good oilfield resume? Click Here !!!

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/

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/calculate-equivalent-circulation-density-ecd-with-complex-engineering-equations/Do you want to have a good oilfield resume? Click Here !!!

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/

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/leak-off-test-procedures-and-calcuation-2/Do you want to have a good oilfield resume? Click Here !!!

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/

http://www.drillingformulas.com/Back to the first pagehttp://www.drillingformulas.com/formation-integrity-test-fit/Do you want to have a good oilfield resume? Click Here !!!

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/

http://www.drillingformulas.com/Back to the first pagehttp://www.drillingformulas.com/equivalent-circulating-density-ecd-in-ppg/Do you want to have a good oilfield resume? Click Here !!!

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

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/calculate-specific-gravity-sg-in-oilfield-unit/http://www.drillingformulas.com/convert-specific-gravity-to-mud-weight-ppg-and-lbft3-and-pressure-gradient-psift/Do you want to have a good oilfield resume? Click Here !!!

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/

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/convert-pressure-into-equivalent-mud-weight/Do you want to have a good oilfield resume? Click Here !!!

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/

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/weight-of-slug-required-for-desired-length-of-dry-pipe-with-set-volume-of-slug/Do you want to have a good oilfield resume? Click Here !!!

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

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/annular-velocity-calculation/Do you want to have a good oilfield resume? Click Here !!!

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/

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/pump-output-calculation-for-duplex-pump-and-triplex-pump/Do you want to have a good oilfield resume? Click Here !!!

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

Back to the first pagehttp://www.drillingformulas.com/http://www.drillingformulas.com/calculate-pressure-gradient/Do you want to have a good oilfield resume? Click Here !!!

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

Back to the first pageDo you want to have a good oilfield resume? Click Here !!!

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


well control formulas drillingformulas.com 1

Documents