58316079 drilling formulas calculation shee v1

Applied Drilling Formula

Basic Formula

Directional Drilling Calculation

Drilling Fluid

Engineering Formula

Hydraulic Formula

Well Control Formula

Lag timeLight weight spot fill to balance formation pressureLoss of hydrostatic pressure due to filling water into annulus in case of lost returnPressure required to break circulationPump out (both duplex and triplex pump)Pump Pressure and Pump Stroke Relationship Sutck Pipe CalculationTon Miles CalculationAccumulator capacityAmount of cuttings drilled per foot of hole drilledAnnular Capacity Annular Velocity (AV)Buoyancy Factor (BF)Convert Temperature UnitConverting Pressure into Mud WeightDrilling Cost Per FootD-Exponent and D-Exponent CorrectedDepth of washoutDisplacment of plain pipe such as casing, tubing, etc.Equivalent Circulating Density (ECD)Formation Integrity Test (FIT)Leak Off Test (LOT)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 objects Pressure and ForcePressure GradientSlug CalculationSpecific Gravity (SG)Directional 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 MethodBulk Density of Cuttings by using Mud BalanceDecrease oil water ratioDetermine oil water ratio from a retort analysisDetermine the density of oil/water mixture Dilution 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 dilutionAnnular Pressure LossCritical RPMCalculate Equivalent Circulating Density with Engineering FormulaHydraulic Horse Power (HPP)Adjusted maximum allowable shut-in casing pressure for new mud weightEstimate gas migration rate with an empirical equationActual gas migration rate in a shut in wellEstimate type of inluxFormaton pressure from kick analysisKick tolerance factor (KTF)Maximum Initial Shut-In Casing Pressure (MISICP)Maximum formation pressure (FP)Maximum influx heightMaximum suface pressure from kick tolerance informationTrip margin

Acutal gas migration rateInput Cells

Increase in pressure 200 psi/hr Calculated CellMud Weight 12 ppgAcutal gas migration rate 321 ft/hr

Reference

Website

Back to the first page

http://www.drillingformulas.com/determine-the-actual-gas-migration-rate/

http://www.drillingformulas.com/



Estimate gas migration rate with an empirical equation.

Current Mud Weight 12 ppg Input cellsVg 0.14 ft/sec Calculated cellsVg 510 ft/hr

Reference

Website


http://www.drillingformulas.com/estimate-gas-migration-rate-in-a-shut-in-well/




Estimate Type of Influx (kick)

Shut in casing pressure 1050 psi Input cellsShut in drill pipe pressure 750 psi Calculated cellsHeight of influx 450 ftCurrent Mud Weight 14 ppgInflux weight 1.2 ppg ReferenceType of influx Gas Influx http://www.drillingformulas.com/estimate-type-of-influx-kick/

Website




http://www.drillingformulas.com/estimate-type-of-influx-kick/

Formation Pressure from Kick Analysis

Shut in drill pipe pressure 550 psi Input cellsHole TVD 6000 ft Calculated cellsCurrent Mud Weight 10.2 ppgFormation Pressure 3732 psi

Reference

Website


http://www.drillingformulas.com/formation-pressure-from-kick-analysis/




Adjusted maximum allowable shut-in casing pressure for new mud weight

Leak off test pressure 1000 psi Input cellsCasing shoe TVD 4500 ft Calculated cellsOriginal Mud Weight 9.5 ppgCurrent Mud Weight 12 ppgNew MASICP 415 psi Reference

Website


http://www.drillingformulas.com/adjusted-maximum-allowable-shut-in-casing-pressure/




Maximum possible influx height when equal to maximum allowable shut in casing pressure

Maximum Allowable Shut-In Casing Pressure (MASICP) 874 psiMud gradient 0.52 psi/ftInflux gradient 0.12 psi/ftMaximum possible influx height 2185 ft

Maximum possible influx height when equal to maximum allowable shut in casing pressure

Input cellsCalculated cells

Reference

Website


http://www.drillingformulas.com/maximum-influx-height-to-equal-the-maximum-allowable-shut-in-casing-pressure/




Maximum Initial Shut-In Casing Pressure (MISICP)

Leak off test pressure 15 ppg Input cellsCurrent mud weight 12.2 ppg Calculated cellsCasing shoe depth 4000 ftMaximum allowable shut in casing pressure 582.4 psi

Reference

Website


http://www.drillingformulas.com/maximum-initial-shut-in-casing-pressure-misicp/




Maximum formation pressure that can wistand when shut in the well.

Kick tolerance factor 1.68 ppg Input cellsMud weight 10 ppg Calculated cellsHole TVD 10000 ftMaximum formation pressure 6,074 psi

Reference

Website


http://www.drillingformulas.com/maximum-formation-pressure-that-can-be-controlled-when-we-shut-the-well-in/




Maximum surface pressure from kick tolerance information

Kick tolerance factor 1.68 ppg Input cellsBottom hole, TVD 10000 ft Calculated cellsMaximum pressure 873.6 psi

Reference

Website


http://www.drillingformulas.com/maximum-surface-pressure-from-kick-tolerance-factor/




Kick tolerance factor (KTF)

Casing shoe TVD 4000 ft Input cellsWell depth TVD 10000 ft Calculated cellsMaximum allowable mud weight 14.2 ppgCurrent mud weight 10 ppgKick tolerance factor (KTF) 1.68 ppg Reference

Website


http://www.drillingformulas.com/kick-tolerance-factor-calculation/




Trip margin calculation

Mud Yield Point 10 lb/100 sq ft Input cellsHole Diameter 8.5 in Calculated cellsDrillpipe Diameter 4.5 inTrip Margin 0.2 ppg

Reference

Website


http://www.drillingformulas.com/trip-margin-calculation/




Lag Time CalculationPump speed 300 GPM Input cellsPump Output 0.102 bbl/stroke Calculated cellsAnnular Volume 250 bblLag time in minutes 35 minutesLag time in strokes 2451 strokes Reference

Website


http://www.drillingformulas.com/lag-time-for-drilling-business-and-how-to-calculate-theoretical-lag-time/




Ton Mile Calculation

Round-trip ton-mileMud Weight 10 ppgMeasured depth (D) 5500 ftDrillpipe weight 13.3 lb/ftdrill collar weight 85 lb/ftdrill collar length 120 ftHWDP weight 49 lb/ftHWDP length 450 ftBHA weight in air 8300 lbLength of BHA 94 ftBlock weight (Wb) 95000 lbAverage length of one stand (Lp) 94 ftBuoyancy factor 0.847Buoyed weight of drill pipe (Wp) 11.27 lb/ft

26,876.24 lb258.75 Ton mile

Drilling or Connection Ton-miles

230 ton-miles

195 ton-milesTon-miles for drilling (Td) 105.00 ton-miles

Ton-miles for Coring Operation

200 ton-miles

190 ton-milesTon-miles for drilling (TC) 20.00 ton-miles

Ton-Miles for Setting CasingMud weight 10 ppgCasing weight 25 lb/ftDepht of casing set 5200 ftTravelling block weight 95000 lbLength of one joint of casing 42 ftBuoyancy factor 0.847Ton-Miles for Setting Casing 50.73 ton-miles

Ton-Miles for Short Trip

200 ton-miles

190 ton-milesTon-miles for drilling (TC) 10.00 ton-miles

Buoyed weight of BHA (drill collar + heavy weight drill pipe + BHA) in mud minus the buoyed weight of the same length of drill pipe (Wc)Round-trip ton-mile (RT TM)

Ton-miles for one round trip of last depth before coming out of hole. (T2)

Ton-miles for one round trip of first depth that drilling is started. (T1)

Ton-miles for one round trip at depth where coring operation stopped before coming out of hole (T4)

Ton-miles for one round trip at depth where coring get started (T3)

Ton-miles for one round trip at the deeper depth(T6)

Ton-miles for one round trip at the shallower depth (T5)


Website

Reference

Reference

Reference

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http://www.drillingformulas.com/round-trip-ton-miles-calculation/

http://www.drillingformulas.com/drilling-or-connection-ton-miles/

http://www.drillingformulas.com/ton-miles-for-coring-operation/

http://www.drillingformulas.com/ton-miles-for-setting-casing/

http://www.drillingformulas.com/ton-miles-while-making-short-trip/


http://www.drillingformulas.com/round-trip-ton-miles-calculation/

http://www.drillingformulas.com/drilling-or-connection-ton-miles/

http://www.drillingformulas.com/ton-miles-for-coring-operation/

http://www.drillingformulas.com/ton-miles-for-setting-casing/

http://www.drillingformulas.com/ton-miles-while-making-short-trip/

“d” ExponentRate of penetration (R) 90 f/hr Input cellsRotary drilling speed (N) 110 rpm Calculated cellsWeight on bit (W) 20 klbBit Diameter (D) 8.5 inch ReferenceD-exponent, dimensionless 1.20

“d” Exponent CorrectedRate of penetration (R) 90 f/hr ReferenceRotary drilling speed (N) 110 rpmWeight on bit (W) 20 klb WebsiteBit Diameter (D) 8.5 inchInitial mud weight in ppg (MW1) 9 ppgActual mud weight in ppg (MW2) 12 ppgD-exponent, dimensionless 0.90


http://www.drillingformulas.com/d-exponent-calculation/

http://www.drillingformulas.com/corrected-d-exponent/





Dilution to Control LGS

1st case: Dilution by adding base fluid or water Input cellsCalculated cells

Total barrels of mud in circulating system 1000Percent low gravity solids in system 6Percent total low gravity solids desired 4 ReferenceBarrels of dilution water or base fluid 500.0

2nd case: Dilution by adding drilling fluid

Total barrels of mud in circulating system 2000 ReferencePercent low gravity solids in system 7Percent total low gravity solids desired 3.5

2 WebsiteBarrels of dilution water or base fluid 4666.7


http://www.drillingformulas.com/dilution-of-mud-system-to-control-low-gravity-solid/

http://www.drillingformulas.com/dilution-of-mud-system-to-control-low-gravity-solid-by-adding-mud/

Percent low gravity solids bentonite and/or chemicals added in mud





Decrease oil water ratio% by volume oil 56 Input cells% by volume water 14 Calculated cells% by volume solids 30Total mud volume, bbl 300

80% Reference20%

70 Website30

10.00 bblTotal volume of water added into the system 30.00 bbl


% original oil in liquid phase% original water in liquid phase http://www.drillingformulas.com/decrease-oil-water-ratio/% new oil in liquip phase% new water in liquid phase http://www.drillingformulas.com/Water added per 100 bbl of original mud

http://www.drillingformulas.com/decrease-oil-water-ratio/


Increase oil water ratio% by volume oil 51 Input cells% by volume water 17 Calculated cells% by volume solids 32

75%25% Reference

8020 Website

Oil added per 100 bbl of original mud 17.00 bbl

Back to the first page% original oil in liquid phase% original water in liquid phase% new oil in liquip phase http://www.drillingformulas.com/increase-oil-water-ratio/% new water in liquid phase


http://www.drillingformulas.com/increase-oil-water-ratio/


Determine oil water ratio from a retort analysis

% by volume oil 56 Input cells% by volume water 14 Calculated cells% by volume solids 30% oil in liquid phase 80%% water in liquid phase 20% ReferenceOil/Water ratio 80/20 http://www.drillingformulas.com/calculate-oil-water-ratio-from-retort-data/

Website




http://www.drillingformulas.com/calculate-oil-water-ratio-from-retort-data/

Determine the density of oil/water mixture

Percentage of oil 80 Input cellsPercentage of water 20 Calculated cellsDensity of oil 7 ppgDensity of water 8.33 ppgFinal density 7.27 ppg Reference

http://www.drillingformulas.com/determine-the-density-of-oil-and-water-mixture/Website




http://www.drillingformulas.com/determine-the-density-of-oil-and-water-mixture/

Input cellsMud Weight#1 10 ppg Calculated cellsMud Weight#2 14 ppgVolume of Mud#1 200 bblVolume of Mud#2 300 bbl ReferenceTotal volume 500 bblFinal Mud Weight 12.4 ppg Website

Mix different fluid density: Case#2 unlimit space


http://www.drillingformulas.com/mixing-fluids-of-different-densities-without-pit-space-limitation/




Mud Weight#1 10 ppg Input cellsMud Weight#2 14 ppg Calculated cellsFinal Mud Weight 12 ppgFinal Volume 300 bblVolume of Mud#1 150 bbl ReferenceVolume of Mud#2 150 bbl

Website

Mix different fluid density: Case#1 limit space


http://www.drillingformulas.com/mixing-fluids-of-different-densities-pit-space-limitation/




Reduce mud weight (dilution)

Strating volume (V1) in bbl 200 bbl Input cellsStart drilling fluid weight in ppg (W1) 13.8 ppg Calculated cellsFinal drilling fluid weight in ppg (W2) 10 ppgDensity of light weight fluid in ppg (Dw) 7.2 ppgLight weight fluid required in bbl 271.4 bbl Reference

Website


http://www.drillingformulas.com/reduce-mud-weight-by-dilution/




Current Mud Weight, ppg 10.0 ppgNew Mud Weight, ppg 13.0 ppgTotal mud in the system 500.0 bblSacks of Barite per 100 bbl of mud 186.7 sacksTotal sacks of barite required 933.3 sacks

Current Mud Weight, ppg 10.0 ppgNew Mud Weight, ppg 13.0 ppgTotal mud in the system 500.0 bblVolume in bbl increase per 100 bbl of mud 11.11 bblTotal volume increase in bbl 55.56 bbl

Current Mud Weight in ppg 10.0 ppgNew Mud Weight in ppg 13.0 ppgFinal volume in bbl 100.0 bblStarting volume in bbl 90.00 bbl

Increase Mud Density by adding Hematite

Volume of mud in bbl increase due to mud weight increase by adding Hematite

Starting volume in bbl of original mud weight required to achieve a predetermined final volume of desired mud weight with


Reference

Reference

Reference


http://www.drillingformulas.com/increase-mud-weight-by-adding-hematite/

http://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 Hematite

http://www.drillingformulas.com/starting-volume-weight-up-with-hematite/

http://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/

Current Mud Weight, ppg 10.0 ppgNew Mud Weight, ppg 13.0 ppgTotal mud in the system 500.0 bblSacks of Barite per 100 bbl of mud 298 sacksTotal sacks of barite required 1492 sacks



Increase Mud Density by adding Carbonate

Volume of mud in bbl increase due to mud weight increase by adding Carbonate



Reference

Reference

Reference


http://www.drillingformulas.com/increase-mud-weight-by-adding-calcium-carbonate/

http://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 Carbonate

http://www.drillingformulas.com/starting-volume-of-original-mud-weight-up-with-calcium-carbonate/

http://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/

Current Mud Weight, ppg 10.0 ppgNew Mud Weight, ppg 13.0 ppgTotal mud in the system 500.0 bblSacks of Barite per 100 bbl of mud 200.5 sacksTotal sacks of barite required 1002.3 sacks



Increase Mud Density by adding Barite

Volume of mud in bbl increase due to mud weight increase by adding Barite



Reference

Reference

Reference

Website


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/

Starting volume in bbl of original mud weight required to achieve a predetermined final volume of desired mud weight with Barite

http://www.drillingformulas.com/starting-volume-of-original-mud-weight-up-with-barite/


http://www.drillingformulas.com/increase-mud-weight-by-adding-barite/


http://www.drillingformulas.com/starting-volume-of-original-mud-weight-up-with-barite/


Pressure required to break circulation

10 min get strenght of mud, lb/100 sq ft 12 lb/100 sq ftInside diameter of drill pipe in inch 3.32 inLength of drill string in ft 11500 ftPressure required to break circulation inside drill string 138.6 psi

10 min get strenght of mud, lb/100 sq ft 12 lb/100 sq ftOutside diameter of drill pipe in inch 4 inHole diameter in inch 6.5 inLength of drill string in ft 11500 ftPressure required to break circulation inside drill string 184.0 psi

Pressure required overcoming the mud’s gel strength inside the drill string.

Pressure required overcoming the mud’s gel strength in the annulus.


Reference

Reference

Website


http://www.drillingformulas.com/pressure-required-to-break-circulation-inside-drillstring/

http://www.drillingformulas.com/pressure-required-to-break-circulation-in-annlus/


http://www.drillingformulas.com/pressure-required-to-break-circulation-inside-drillstring/

http://www.drillingformulas.com/pressure-required-to-break-circulation-in-annlus/


Light weight spot fill to balance formation pressureInput cells

Current mud weight, ppg 13 ppg Calculated cellsOverblance with current mud weight, psi 300 psiWeigth of light weight pill, ppg 8.3 ppg ReferenceHeight of light weight pill, ft, in annulus 1227 ft

Website

You must ensure than height of light weight pill in the annulus must less than 1227 ft in order to prevent wellcontrol situation.


http://www.drillingformulas.com/determine-height-of-light-weight-spot-pill-to-balance-formation-pressure/




You must ensure than height of light weight pill in the annulus must less than 1227 ft in order to prevent wellcontrol situation.





Loss of hydrostatic pressure due to filling water into annulus in case of lost return

Current Mud Weight in ppg 13 ppg Input cellsWater Weight in ppg 8.6 ppg Calculated cellsTVD in ft 6000 ftAnnular Capacity in bbl/ft 0.1422 bbl/ftWater filled into annulus in bbl 140 bblFeet of water in annuls 984.5 ft ReferenceHydrostaic Pressure decrease 225.3 psiEquivalent Mud Weigth at TD 12.3 ppg Website


http://www.drillingformulas.com/loss-of-hydrostatic-pressure-due-to-lost-return/




Displacment of plain pipe such as casing, tubing, etc.

OD 9.625 inch Input cellsID 8.835 inch calculated cellsDisplacment in bbl/ft 0.01417 bbl/ft

Referencehttp://www.drillingformulas.com/pipe-displacement-calculation/Website




http://www.drillingformulas.com/pipe-displacement-calculation/

Sutck Pipe Calculation

Stretch in inch 5 inch Input cellsFree point constant 28634.51 calculated cellsPull force in Klb 100 KlbDepth of stuck pipe 1431.73 ft

Free Point Constant (FPC) calculationOutside Diameter 9.625 inchInside Diameter 8.835 inchFPC 28634.51

Sutck Pipe Calculation (in case of not know Free Point Constant (FPC))

Stretch in inch 5 inchPull force in Klb 100 KlbOutside Diameter 9.625 inchInside Diameter 8.835 inchDepth of stuck pipe 1431.73 ft


Accumulator Capacity

Suface Application Input cellsVolume per bottle 10 gal calculated cellsPre-charge pressure 1000 psiMinimum System Pressure 1200 psiOperating Pressure 3000 psi ReferenceUsable Volume per bottle 5.00 gal

Subsea ApplicationVolume per bottle 10 galPre-charge pressure 1000 psiMinimum System Pressure 1200 psiOperating Pressure 3000 psi ReferencePressure gradient of hydraulic fluid 0.445 psi/ftWater depth 1500 ft WebsiteUsable Volume per bottle 4.38 gal


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/





Input cellsHole size, Casing ID, Tubing ID, etc 6.125 calculated cells

0.0364

Hole size, Casing ID, Tubing ID, etc 6.125 Reference27.4392

Website

Hole size, Casing ID, Tubing ID, etc 6.1251.5306

Hole size, Casing ID, Tubing ID, etc 6.1250.6533

Calculate inner capacity of open hole, inside cylindrical objects such as tubulars, drill pipe, drill collars, tubing, casing etc

Calculate capacity in bbl/ft

Capacity in bbl/ft Back to the first page

Calculate capacity in ft/bbl

Capacity in ft/bbl http://www.drillingformulas.com/calculate-inner-capacity-of-open-holeinside-cylindrical-objects/

Calculate capacity in gal/ft http://www.drillingformulas.com/

Capacity in gal/ft

Calculate capacity in ft/gal

Capacity in ft/gal

http://www.drillingformulas.com/calculate-inner-capacity-of-open-holeinside-cylindrical-objects/


Calculate inner capacity of open hole, inside cylindrical objects such as tubulars, drill pipe, drill collars, tubing, casing



Annular capacity between casing or hole and drill pipe, tubing, or casing.

Input cellsHole size, casing ID in inch 8.5 calculated cellsDrill pipe size, DC size or casing/tubing OD 5

0.04590

Hole size, casing ID in inch 6.125 ReferenceDrill pipe size, DC size or casing/tubing OD 3.5

40.743 Website

Hole size, casing ID in inch 6.125Drill pipe size, DC size or casing/tubing OD 3.5

1.031

Hole size, casing ID in inch 6.125Drill pipe size, DC size or casing/tubing OD 3.5

0.970

Calculate annular capacity in bbl/ft

Back to the first pageAnnular capacity, bbl/ft

Calculate annular capacity in ft/bbl

http://www.drillingformulas.com/calculate-annular-capacityAnnular capacity, ft/bbl

http://www.drillingformulas.com/Calculate annular capacity in gal/ft

Annular capacity, gal/ft

Calculate annular capacity in ft/gal

Annular capacity, ft/gal

http://www.drillingformulas.com/calculate-annular-capacity


Cost Per Foot CalculationInput cells

Bit cost (B), $ 27000 calculated cellsRig cost (CR), $/hr 3500Rotating time (t), hrs 50Round trip time (T), hrs 12 ReferenceFootage per bit (F), ft 5000Cost per foot , $/ft 48.80 Website


http://www.drillingformulas.com/drilling-cost-per-footdrilling-cost-per-foot/




Pump Pressure and Pump Stroke Relationship

Basic Calculation Input cellscalculated cells

Current Circulating Pressure, psi 2500Old Pump Rate, SPM 40New Pump Rate, SPM 25New Circulating Pressure, psi 976.6

Advanced calculation (Determine factor)

Pressure 1, psi 2700Flow rate1, gpm 320Pressure 2, psi 500Flow rate2, gpm 130Factor 1.872Current Circulating Pressure, psi 2500 ReferenceOld Pump Rate, SPM 40New Pump Rate, SPM 25 WebsiteNew Circulating Pressure, psi 1037.0


http://www.drillingformulas.com/pump-pressure-and-pump-stroke-relationship/




Hydraulic Horse Power (HPP)

Circulating Pressure, psi 3500 Input cellsFlow rate, GPM 800 calculated cellsHydraulic Horse Power (HPP) 1633.61

Reference

Website


http://www.drillingformulas.com/hydraulic-horse-power-calculatin/




Formation TemperatureInput cells

Surface Temperature, F 90 calculated cellsTemperature Gradient, F/ft 0.015Formation Depth in TVD, ft 12000Formation Temperature, F 270 Reference

Website


http://www.drillingformulas.com/formation-temperature/




Critical RPM to prevent pipe failure due to high vibrationJust rough estimate 15% accurate Input cells

calculated cellsLength of one joint of drill pipe, ft 32OD of drill pipe, inch 4ID of drill pipe, inch 3.5 ReferenceCritical RPM 172

Website


http://www.drillingformulas.com/critical-rpm-to-avoid-excessive-vibration/




Calculate Equivalent Circulating Density with Engineering Formula

Mud weight 12.4 Input cellsReading at 300 51 calculated cellsReading at 600 87PV 36Pump rate, gpm 110Hole diameter, in 6.2Drill pipe OD, in 4Drill pipe length, ft 12616Drill collar OD, in 5Drill collar length, ft 50TVD, ft 9344

n 0.770K 0.419Annular velocity around DP, ft/min 120.1 Lamina FlowCritical velocity around DP, ft/min 383.5Annular velocity around DC, ft/min 200.5 Lamina FlowCritical velocity around DC, ft/min 560.6Pressure loss around DP 367.7 ReferencePressure loss around DC 4.3Total annular pressure loss 372.0 Website

ECD at 9344' TVD in ppg 13.17


http://www.drillingformulas.com/calculate-equivalent-circulation-density-ecd-with-complex-engineering-equations/




Annular Pressure Loss

Mud Weight in ppg 13.0 Input cellsLength in ft 8000.0 calculated cellsFlow rate in GPM 320.0Dh, in 6.50Dp, in 4.00 Referencevelocity, ft/min 298.7P loss annular in psi 531.65 Website


http://www.drillingformulas.com/calcuate-annular-pressure-loss/




Direcional Survey CalculationAngle Averaging Method

Survey1 Survey2Depth (ft) 7482 7782 Input cellsInclination (degree) 4 8 calculated cellsAzimuth (degree) 10 35

North 28.97 ft ReferenceEast 12.00 ftVertical 298.36 ft Website


http://www.drillingformulas.com/angle-averaging-method-in-directional-drilling-calculation/




Direcional Survey CalculationRadius of Curvature Method

Input cellsSurvey1 Survey2 calculated cells

Depth (ft) 7482 7782Inclination (degree) 4 8Azimuth (degree) 10 35

ReferenceNorth 28.74 ftEast 11.90 ft WebsiteVertical 298.30 ft


http://www.drillingformulas.com/radius-of-curvature-method/




Direcional Survey CalculationBalanced Tangential Method


Depth (ft) 3500 3600Inclination (degree) 15 25Azimuth (degree) 20 45

ReferenceNorth 27.10 ftEast 19.37 ft WebsiteVertical 93.61 ft


http://www.drillingformulas.com/balanced-tangential-method-calculation/




Direcional Survey CalculationMinimum Curvature Method Input cells

calculated cellsSurvey1 Survey2

Depth (ft) 3500 3600Inclination (degree) 15.00 25.00Azimuth (degree) 20.00 45.00

β 0.22605 radians ReferenceRF 1.00428North 27.22 ft WebsiteEast 19.45 ftVertical 94.01 ft


http://www.drillingformulas.com/minimum-curvature-method/




Direcional Survey CalculationTangential Method


Depth (ft) 3500 3600Inclination (degree) 15.00 25.00Azimuth (degree) 20.00 45.00

ReferenceNorth 29.88 ft http://www.drillingformulas.com/tangential-method-calculation/East 29.88 ft WebsiteVertical 90.63 ft




http://www.drillingformulas.com/tangential-method-calculation/

Survey1 Survey2Depth (ft) 4231 4262 Input cellsInclination (degree) 13.5 14.7 calculated cellsAzimuth (degree) 10 19

Dogleg severity 8.05 degree/100 ft Reference

Website

Calculate dogleg severity between 2 survey points based on Radius of Curvature Method


http://www.drillingformulas.com/dogleg-severity-calculationbased-on-radius-of-curvature-method/




Radius of Curvature Method



Survey1 Survey2 Input cellsDepth (ft) 4231 4262 calculated cellsInclination (degree) 13.5 14.7Azimuth (degree) 10 19

ReferenceDogleg severity 3.23 degree/100 ft

Website

Calculate dogleg severity between 2 survey points based on tangential method


http://www.drillingformulas.com/dogleg-severity-calculation-based-on-tangential-method/




Determine force with given pressure and areaPressure 500 psi Input cells

Area 3 calculated cellsForce 1500 lb

orDetermine force with given pressure and diameter ReferencePressure 500 psiDiameter 3 in WebsiteForce 3534.3 lb

in2


http://www.drillingformulas.com/pressure-and-force-relationship-and-applications/




Leak Off Test Pressure Converted to Equivalent Mud Weight (LOT)

LOT pressure (psi) 1600 psi Input cellsMud Weight (ppg) 9.2 ppg calculated cellsShoe Depth (TVD) 4000 ftLOT equivalent mud weight 16.9 ppg

Reference

Website


http://www.drillingformulas.com/leak-off-test-procedures-and-calcuation-2/




Pressure Required Formation Integrity Test (FIT)FIT required (ppg) 14.5 ppgMud Weight (ppg) 9.2 ppgShoe Depth (TVD) 4000 ftPressure required (psi) 1102.4

Input cellscalculated cells

Reference

Website


http://www.drillingformulas.com/formation-integrity-test-fit/


http://www.drillingformulas.com/formation-integrity-test-fit/


Equivalent Circulating Density (ECD), ppgAnnular pressure loss(psi) 400 psi Input cellsMud weight (ppg) 10 ppg calculated cellsTVD (ft) 8000 ftECD 11.0 PPG

Reference

Website


http://www.drillingformulas.com/equivalent-circulating-density-ecd-in-ppg/




Specific Gravity (SG)Specific gravity using mud weight, ppgMud weight (ppg) 13 ppgSG 1.56

Specific gravity using pressure gradient, psi/ftPressure gradient (psi/ft) 0.50 psi/ftSG 1.15

Mud weight (lb/ft3) 90.00 lb/ft3SG 1.44

Convert specific gravity to mud weight, ppgSG 1.50MW (ppg) 12.50 ppg

Convert specific gravity to pressure gradient, psi/ftSG 1.50Pressure Gradient (psi/ft) 0.650 psi/ft

SG 1.50Mud weight (lb/ft3) 93.600 lb/ft3

Specific gravity using mud weight, lb/ft3

Convert specific gravity to mud weight, lb/ft3


Website

Reference

Reference



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/


http://www.drillingformulas.com/calculate-specific-gravity-sg-in-oilfield-unit/


Converting Pressure into Mud WeightConvert pressure, psi, into mud weight, ppg using feet as the unit of measurePressure (psi) 5000 psiTVD (ft) 8000 ftMW (ppg) 12.0 PPG

Convert pressure, psi, into mud weight, ppg using meters as the unit of measurePressure (psi) 5000 psiTVD (m) 2500 mMW (ppg) 11.7 PPG


Reference

Website


http://www.drillingformulas.com/convert-pressure-into-equivalent-mud-weight/


http://www.drillingformulas.com/convert-pressure-into-equivalent-mud-weight/


Barrels of slug required for a desired length of dry pipe

Desired length of dry pipe (ft) 400 ftDrill pipe capacity (bbl/ft) 0.015 bbl/ftCurrent MW (PPG) 11.5 ppgSlug Weight (PPG) 12.5 ppg

Hydrostatic pressure required to give desired drop inside drill pipe 239.2 psiDifference in pressure gradient bw slug and current MW 0.052 psi/ftLength of slug in drill pipe (ft) 4600 ftSlug Volume 69.00 bbl

Weight of slug required for a desired length of dry pipe with a set volume of slug

Desired length of dry pipe (ft) 400 ftSlug Volume (bbl) 30 bblDrill pipe capacity (bbl/ft) 0.015 bbl/ftCurrent MW (PPG) 11.5 ppg

Slug length (ft) 2000.0 ftHydrostatic Pressure required (psi) 239.2 psiWeight of slug (PPG) 13.8 ppg


Website

Referencehttp://www.drillingformulas.com/barrels-of-slug-required-for-desired-length-of-dry-pipe/

Reference



http://www.drillingformulas.com/weight-of-slug-required-for-desired-length-of-dry-pipe-with-set-volume-of-slug/



Hydrostatic Pressure (HP)Hydrostatic pressure using ppg and feet as the units of measureMud weight 12 ppg Input cellsTVD (ft) 10000 ft calculated cellsHydrostatic Pressure (psi) 6240.0 psi

Hydrostatic pressure, psi, using pressure gradient, psi/ftPressure gradient (psi/ft) 0.5 psi/ft ReferenceTVD (ft) 10000 ft http://www.drillingformulas.com/hydrostatic-pressure-calculation/Hydrostatic Pressure (psi) 5000.0 psi Website

Mud weight (lb/ft3) 80 lb/ft3TVD (ft) 10000 ftHydrostatic Pressure (psi) 5555.2 psi

Hydrostatic pressure, psi, using meters as unit of depthMud weight 12 ppgTVD (m) 5000 mHydrostatic Pressure (psi) 10236.7 psi


Hydrostatic pressure, psi, using mud weight, lb/ft3 http://www.drillingformulas.com/


http://www.drillingformulas.com/hydrostatic-pressure-calculation/

Annular Velocity (AV) in ft/minFormula 1: AV = pump output, bbl/min ÷ annular capacity, bbl/ftPump out put (bbl/min) 10 bbl/minAnnular capacity (bbl/ft) 0.13 bbl/ftAnnular Velocity (AV) 76.92 ft/minFormula 2: Flow rate in gpm and diameter between 2 diametersFlow rate (gpm) 800 gpmBigger diameter (in) 10 in such as hole size, casing ID, etcSmaller diameter (in) 5 in such as drill pipe OD, tubing OD, etcAnnular Velocity (AV) 261.33 ft/minFormula 3: flow rate in bbl/min and diameterFlow rate (bbl/min) 13 bbl/minBigger diameter (in) 10 in such as hole size, casing ID, etcSmaller diameter (in) 5 in such as drill pipe OD, tubing OD, etcAnnular Velocity (AV) 178.43 ft/min

Annular velocity (AV), ft/secFormula 1: Flow rate in bbl/min and diameter between 2 diametersFlow rate (bbl/min) 13 bbl/minBigger diameter (in) 10 inSmaller diameter (in) 5 inAnnular Velocity (AV) 2.97 ft/secPump output in gpm required for a desired annular velocity, ft/mimAnnular Velocity (ft/min) 120 ft/minBigger diameter (in) 10 inSmaller diameter (in) 5 inRequired pump rate (gpm) 367.35 gpmStrokes per minute (SPM) required for a given annular velocityAnnular Velocity (ft/min) 150 ft/minBigger diameter (in) 10 inSmaller diameter (in) 5 inPump out put (bbl/stk) 0.1 bbl/stkSPM required 109.29 spm


Reference

Website


http://www.drillingformulas.com/annular-velocity-calculation/


http://www.drillingformulas.com/annular-velocity-calculation/


Pump outTriplex Pump, bbl/stk Input cellsefficiency (%) 97 calculated cellsLiner diameter (in) 6 inStroke length (in) 12 inPO (bbl/stk) 0.10183 bbl/stk

Duplex Pump , bbl/stkefficiency (%) 85Liner diameter (in) 6 in ReferenceRod diameter (in) 2 inStroke length (in) 12 in WebsitePO (bbl/stk) 0.11236 bbl/stk


http://www.drillingformulas.com/pump-output-calculation-for-duplex-pump-and-triplex-pump/




Buoyancy Factor (BF)

Buoyancy factor using mud weight, PPG Input cellsMW (PPG) 13 calculated cellsBF 0.802

ReferenceMW (lb/ft3) 100BF 0.796 Website


Buoyancy factor using mud weight, lb/ft3

http://www.drillingformulas.com/buoyancy-factor-calculation/




Amount of cuttings drilled per foot of hole drilled

a) BARRELS of cuttings drilled per foot of hole drilled:Porosity(%) 25Hole diameter (in) 6.125

BBL/ft 0.027333 bbl/footage drilledb) CUBIC FEET of cuttings drilled per foot of hole drilled:Porosity(%) 25Hole diameter (in) 6.125

cu-ft/ft 0.153462 cu.ft/footage drilledc) Total solids generated:Hole diameter (in) 6.125Hole capacity (bbl/ft) 0.036444Footage drilled (ft) 100Porosity(%) 25Cutting Density (gm/cc) 2.2Solid generated(pounds) 2104.651 pound


Reference

Website


http://www.drillingformulas.com/amount-of-cuttings-total-solid-generated/


http://www.drillingformulas.com/amount-of-cuttings-total-solid-generated/


Pressure Gradient CalculationPressure gradient, psi/ft, using mud weight, ppgMW (ppg) 9 PPGPressure gradient (psi/ft) 0.468 psi/ft

MW (lb/ft3) 80 lb/ft3Pressure gradient (psi/ft) 0.556 psi/ft

Pressure gradient, psi/ft, using mud weight, specific gravity (SG)MW sg 2Pressure gradient (psi/ft) 0.866 psi/ft

Convert pressure gradient, psi/ft, to mud weight, ppgPressure gradient (psi/ft) 0.5 psi/ftMW (ppg) 9.62 PPG

Convert pressure gradient, psi/ft, to mud weight, lb/ft3Pressure gradient (psi/ft) 0.5 psi/ftMW (ppg) 72.00 lb/ft3

Convert pressure gradient, psi/ft, to mud weight specific gravity (SG)Pressure gradient (psi/ft) 0.5 psi/ftSpecific Gravity 1.155

Pressure gradient, psi/ft, using mud weight, lb/ft3


Reference

Website


http://www.drillingformulas.com/calculate-pressure-gradient/


http://www.drillingformulas.com/calculate-pressure-gradient/


Convert temperature, °Fahrenheit (F) to °Celsius (C)F 347 Input cellsC 175.0 calculated cells

Convert temperature, °Celsius (C) to °FahrenheitC 26.667F 80.0 Reference

Convert temperature, ° Celsius (C) to °Kelvin (K) WebsiteC 23K 296.2

Convert temperature, °Fahrenheit (F) to °Rankine (R)F 150R 609.7


http://www.drillingformulas.com/temperature-conversion-formulas/




Accumulator Pre-charge Pressure

P start 3000 Input cellsP final 2000 calculated cellsVolume removed 25Volume total 200Average pre charge pressure 750


Bulk Density of Cuttings by using Mud BalanceProcedure to obtain RW:1. Cuttings must be washed free of mud. In oil base mud, diesel oil can be used instead of water.2. Set mud balance at 8.33 ppg.3. Fill the mud balance with cuttings until a balance is obtained with the lid in place.4. Remove lid, fill cup with water (cuttings included), replace lid, and dry outside of mud balance.

RW, ppg 14SG 3.12

5. Move counterweight to obtain new balance. This value is “Rw” = resulting weight with cuttings plus water, ppg.


Reference

Website


This value is “Rw” = resulting weight with cuttings plus water, ppg. http://www.drillingformulas.com/bulk-density-cuttings-using-mud-balance/


http://www.drillingformulas.com/bulk-density-cuttings-using-mud-balance/


Hydrostatic pressure to lose 200 psiCasing capacity 0.0873 bbl/ft Input cellsPipe displacement 0.01876 bbl/ft calculated cellsMud weight 12 PPGFeet of drill pipe pulled 1171 ft

% of volume in drill pipe out of hole 100 %Hydrostatic pressure to lose 200 psiPipe displacement 0.0055 bbl/ft ReferencePipe capacity 0.01876 bbl/ft http://www.drillingformulas.com/drill-pipe-pulled-to-lose-hydrostatic-pressure/Casing capacity 0.0873 bbl/ft WebsiteMud Weight 12 PPGFeet of drill pipe pulled 833 ft

How many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi) when


How many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi) when



http://www.drillingformulas.com/drill-pipe-pulled-to-lose-hydrostatic-pressure/

How many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi) when pull dry.

How many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi) when pull wet.

Hydrostatic Pressure (HP) Decrease When POOHWhen pulling DRY pipe Input cellsStands pulled 10 stands calculated cellsLength per stand 91 ftPipe displacement 0.0055 bbl/ftCasing capacity 0.0873 bbl/ftMud Weight 12 PPG ReferenceBBL displace 5.01 bbl http://www.drillingformulas.com/hydrostatic-pressure-decrease-when-pooh/HP decrease (psi) 38.18 psi Website

When pulling WET pipe

100Stands pulled 10 standsLength per stand 91 ftPipe displacement 0.0055 bbl/ftPipe capacity 0.01876 bbl/ftCasing capacity 0.0873 bbl/ftMud Weight 12.0 PPGBBL displace 22.08 bblHP decrease (psi) 218.52 Psi



% of volume in drill pipe out of hole


http://www.drillingformulas.com/hydrostatic-pressure-decrease-when-pooh/



Depth of washout

Method 1:

Strokes pumped till pressure increase 400 strokes Input cellsInternal capacity of drill pipe 0.00742 bbl/ft calculated cellsPump output 0.0855 bbl/stkDepth of washout 4609 ft

Method 2:

Strokes pumped till material seen 2500 strokesInternal capacity of drill pipe 0.00742 bbl/ftAnnulus capacity 0.0455 bbl/ft ReferencePump output 0.0855 bbl/stk http://www.drillingformulas.com/depth-of-washout/Volume from bell nipple to shale shakers 10 bbl WebsiteDepth of washout 3850 ft

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.


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.



http://www.drillingformulas.com/depth-of-washout/

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.

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.



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