drilling formulas calculation shee v1.1 1

7/29/2019 Drilling Formulas Calculation Shee V1.1 1

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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 RelationshipSutck Pipe Calculation

Ton Miles CalculationAccumulator capacityAmount of cuttings drilled per foot of hole drilledAnnular CapacityAnnular 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 objectsPressure 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 Method

Dogleg 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 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 Limitation

Reduce mud weight by dilution

Annular Pressure LossCritical RPM

Calculate Equivalent Circulating Density with Engineering FormulaHydraulic Formula Hydraulic Horse Power (HPP)

Actual 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 inluxFormaton pressure from kick analysisHydrostatic Pressure Loss Due to Gas Cut MudKick 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 suface pressure from kick tolerance informationMaximum Surface Pressure from Gas Influx in Water Based MudTrip margin

Well Control Formula

Basic Formula

Applied Drilling Formula

Directional Drilling Calculation

Drilling Fluid

Engineering Formula


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Maximum pit gain from gas kick in water based mud.doc

Expected formation pressure 3620 psi

Pit volume gain 20 bblKill Weight Mud 14.5 ppgAnnular Capacity 0.1215 bbl/ft

Maximum pit gain 98.5 bbl


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Input Cells

Calculated Cell

Back to the first page

Reference

http://www.drillingformulas.com/maximum-pit-gain-from-gas-kick-in-water-based-mud/

Website

http://www.drillingformulas.com/
http://www.drillingformulas.com/maximum-pit-gain-from-gas-kick-in-water-based-mud/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/maximum-pit-gain-from-gas-kick-in-water-based-mud/


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Maximum Surface Pressure from Gas Influx in Water Based Mud

Expected formation pressure 6378 psi

Pit volume gain 25 bblKill Weight Mud 13 ppgAnnular Capacity 0.0459 bbl/ft

Maximum Surface Pressure 1344 psi


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Input Cells

Calculated Cell


Reference

http://www.drillingformulas.com/maximum-surf3ace-pressure-from-gas-influx-in-water-based-mud/

Website

http://www.drillingformulas.com/maximum-surf3ace-pressure-from-gas-influx-in-water-based-mud/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/maximum-surf3ace-pressure-from-gas-influx-in-water-based-mud/


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Hydrostatic Pressure Loss Due to Gas Cut

Mud weight 12 ppg

Annular Capacity 0.0352 bbl/ft

Pit volume gain 15 bbl

Hydrostatic Pressure Loss Due to Gas Cut 266 ft


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Input CellsCalculated Cell


Reference

http://www.drillingformulas.com/hydrostatic-pressure-loss-due-to-gas-cut-mud/

Website

http://www.drillingformulas.com/hydrostatic-pressure-loss-due-to-gas-cut-mud/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/hydrostatic-pressure-loss-due-to-gas-cut-mud/


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Calculate Influx Height

Pit volume gain 12 bbl

Annular Capacity 0.0459 bbl/ft

Influx height 261 ft


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Input Cells

Calculated Cell


Reference

http://www.drillingformulas.com/calculate-influx-height/

Website

http://www.drillingformulas.com/calculate-influx-height/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/calculate-influx-height/


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Kill Mud Weight

Shut in Drillpipe Pressure 500 psi Input CellsCurrent Mud Weight 9.5 ppg Calculated CellHole TVD 9000 ft Back to the first pageKill Mud Weight 10.6 ppg

Reference

http://www.drillingformulas.com/shut-

Website

http://www.drillingformulas.com/shut-down-pumps-weight-up-mud/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/shut-down-pumps-weight-up-mud/


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Acutal gas migration rate

Input CellsIncrease in pressure 200 psi/hr Calculated CellMud Weight 12 ppg Back to the first pageAcutal gas migration rate 321 ft/hr

Reference

http://www.drillingformulas.com/determine-the-actu

Website

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


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Estimate gas migration rate with an empirical equation.

Current Mud Weight 12 ppg Input cells

Vg 0.14 ft/sec Calculated cells

Vg 510 ft/hr Back to the first page

Reference

http://www.drillingformulas.com/estimate-gas-mi

Website

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


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Estimate Type of Influx (kick)

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

Websitehttp://www.drillingformulas.com/
http://www.drillingformulas.com/http://www.drillingformulas.com/


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Formation Pressure from Kick Analysis

Shut in drill pipe pressure 550 psi Input cells

Hole TVD 6000 ft Calculated cells

Current Mud Weight 10.2 ppg Back to the first pageFormation Pressure 3732 psi

Reference

http://www.drillingformulas.com/formWebsite

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


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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 ppg Back to the first pageCurrent Mud Weight 12 ppg

New MASICP 415 psi Referencehttp://www.drillingformulas.com/adjuWebsite

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


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

Maximum Allowable Shut-In Casing Pressure (MASICP) 874 psi

Mud gradient 0.52 psi/ft

Influx gradient 0.12 psi/ft

Maximum possible influx height 2185 ft


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Input cells

Calculated cells


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

Website

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


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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 ft Back to the first pageMaximum allowable shut in casing pressure 582.4 psi

Reference

http://www.drillingformulaWebsite

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


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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 ft Back to the first pageMaximum formation pressure 6,074 psi

Reference

http://www.drillingformulas.com/maxiWebsite

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


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Maximum surface pressure from kick tolerance information

Kick tolerance factor 1.68 ppg Input cellsBottom hole, TVD 10000 ft Calculated cells

Maximum pressure 873.6 psi Back to the first pageReference

http://www.drillingformulas.com/maximum-surfaWebsite

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


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Kick tolerance factor (KTF)

Casing shoe TVD 4000 ft Input cellsWell depth TVD 10000 ft Calculated cells

Maximum allowable mud weight 14.2 ppg Back to the first pageCurrent mud weight 10 ppg

Kick tolerance factor (KTF) 1.68 ppg Referencehttp://www.drillingformulas.com/kick-tolerance-fa

Website

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


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Trip margin calculation

Mud Yield Point 10 lb/100 sq ft Input cellsHole Diameter 8.5 in Calculated cellsDrillpipe Diameter 4.5 in Back to the first pageTrip Margin 0.2 ppg

Reference

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

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


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Lag Time Calculation

Pump speed 300 GPM Input cells

Pump Output 0.102 bbl/stroke Calculated cells

Annular Volume 250 bbl Back to the first page

Lag time in minutes 35 minutesLag time in strokes 2451 strokes Reference

http://www.drillingformulas.com/lag-time-for-driWebsite

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


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Ton Mile Calculation

Round-trip ton-mile

Mud Weight 10 ppgMeasured depth (D) 5500 ftDrillpipe weight 13.3 lb/ft

drill collar weight 85 lb/ftdrill collar length 120 ft

HWDP weight 49 lb/ftHWDP length 450 ftBHA weight in air 8300 lbLength of BHA 94 ftBlock weight (Wb) 95000 lb

Average length of one stand (Lp) 94 ftBuoyancy factor 0.847Buoyed weight of drill pipe (Wp) 11.27 lb/ftBuoyed weight of BHA (drill collar + heavyweight drill pipe + BHA) in mud minus thebuoyed weight of the same length of drillpipe (Wc) 26,876.24 lbRound-trip ton-mile (RT TM) 258.75 Ton mile

Drilling or Connection Ton-miles

Ton-miles for one round trip of last depthbefore coming out of hole. (T2) 230 ton-milesTon-miles for one round trip of first depththat drilling is started. (T1) 195 ton-milesTon-miles for drilling (Td) 105.00 ton-miles

Ton-miles for Coring Operation

Ton-miles for one round trip at depth wherecoring operation stopped before coming outof hole (T4) 200 ton-miles

Ton-miles for one round trip at depth wherecoring get started (T3) 190 ton-milesTon-miles for drilling (TC) 20.00 ton-miles

Ton-Miles for Setting Casing

Mud weight 10 ppgCasing weight 25 lb/ftDepht of casing set 5200 ftTravelling block weight 95000 lbLength of one joint of casing 42 ftBuoyancy factor 0.847

Ton-Miles for Setting Casing 50.73 ton-miles

Ton-Miles for Short TripTon-miles for one round trip at the deeperdepth(T6) 200 ton-milesTon-miles for one round trip at theshallower depth (T5) 190 ton-milesTon-miles for drilling (TC) 10.00 ton-miles


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Input cellsCalculated cellsBack to the first page

Website


Reference

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

Reference

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

Reference

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

Reference

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

Reference

http://www.drillingformulas.com/ton-miles-while-making-short-trip/
http://www.drillingformulas.com/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/ton-miles-while-making-short-trip/http://www.drillingformulas.com/ton-miles-for-setting-casing/http://www.drillingformulas.com/ton-miles-for-coring-operation/http://www.drillingformulas.com/drilling-or-connection-ton-miles/http://www.drillingformulas.com/round-trip-ton-miles-calculation/http://www.drillingformulas.com/


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d ExponentRate of penetration (R) 90 f/hr Input cellsRotary drilling speed (N) 110 rpm Calculated cellsWeight on bit (W) 20 klb Back to the first pageBit Diameter (D) 8.5 inch ReferenceD-exponent, dimensionless 1.20 http://www.drillingformul

d Exponent CorrectedRate of penetration (R) 90 f/hr ReferenceRotary drilling speed (N) 110 rpm http://www.drillingformul

Weight on bit (W) 20 klb WebsiteBit Diameter (D) 8.5 inch http://www.drillingformulInitial 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/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/corrected-d-exponent/http://www.drillingformulas.com/d-exponent-calculation/


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las.com/corrected-d-exponent/

las.com/


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Dilution to Control LGS

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

Calculated cellsTotal barrels of mud in circulating system 1000 Back to the first pagePercent low gravity solids in system 6

Percent total low gravity solids desired 4 ReferenceBarrels of dilution water or base fluid 500.0 http://www.drillingformulas.com/dilu

2nd case: Dilution by adding drilling fluid

Total barrels of mud in circulating system 2000 ReferencePercent low gravity solids in system 7 http://www.drillingformulas.com/diluPercent total low gravity solids desired 3.5Percent low gravity solids bentonite and/orchemicals added in mud 2 WebsiteBarrels of dilution water or base fluid 4666.7 http://www.drillingformulas.com/
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/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/dilution-of-mud-system-to-control-low-gravity-solid-by-adding-mud/http://www.drillingformulas.com/dilution-of-mud-system-to-control-low-gravity-solid/


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Decrease oil water ratio% by volume oil 56 Input cells% by volume water 14 Calculated cells% by volume solids 30 Back to the first pageTotal mud volume, bbl 300% original oil in liquid phase 80% Reference% original water in liquid phase 20% http://www.drillingformu% new oil in liquip phase 70 Website% new water in liquid phase 30 http://www.drillingformuWateradded per100 bbl of original mud 10.00 bblTotal volume of water added into the system 30.00 bbl
http://www.drillingformulas.com/decrease-oil-water-ratio/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/decrease-oil-water-ratio/


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Increase oil water ratio

% by volume oil 51 Input cells% by volume water 17 Calculated cells% by volume solids 32 Back to the first page% original oil in liquid phase 75%% original water in liquid phase 25% Reference% new oil in liquip phase 80 http://www.drillingformulas.com/inc% new water in liquid phase 20 WebsiteOil added per 100 bbl of original mud 17.00 bbl http://www.drillingformulas.com/
http://www.drillingformulas.com/increase-oil-water-ratio/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/increase-oil-water-ratio/


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Determine oil water ratio from a retort analysis

% by volume oil 56 Input cells% by volume water 14 Calculated cells% by volume solids 30 Back to the first page% oil in liquid phase 80%% water in liquid phase 20% ReferenceOil/Water ratio 80/20 http://www.drillingformulas.com/calculate-oil-w

Website



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Determine the density of oil/water mixture

Percentage of oil 80 Input cellsPercentage of water 20 Calculated cellsDensity of oil 7 ppg Back to the first pageDensity of water 8.33 ppgFinal density 7.27 ppg Reference

http://www.drillingformulas.com/determine-the-

Website



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Mix different fluid density: Case#2 unlimit space

Input cellsMud Weight#1 10 ppg Calculated cellsMud Weight#2 14 ppg Back to the first pageVolume of Mud#1 200 bblVolume of Mud#2 300 bbl ReferenceTotal volume 500 bbl http://www.drillingformulas.com/mixing-fluids-of-different-dFinal Mud Weight 12.4 ppg Website

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


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Mix different fluid density: Case#1 limit space

Mud Weight#1 10 ppg Input cellsMud Weight#2 14 ppg Calculated cellsFinal Mud Weight 12 ppg Back to the first pageFinal Volume 300 bblVolume of Mud#1 150 bbl ReferenceVolume of Mud#2 150 bbl http://www.drillingformulas.com/mixing-fluids-o

Website

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


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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 ppg Back to the first pageDensity of light weight fluid in ppg (Dw) 7.2 ppgLight weight fluid required in bbl 271.4 bbl Reference

http://www.drillingformulas.com/reduce-mud-w

Website

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


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Increase Mud Density by adding Hematite

Current Mud Weight, ppg 10.0 ppg

New Mud Weight, ppg 13.0 ppgTotal mud in the system 500.0 bbl

Sacks of Barite per 100 bbl of mud 186.7 sacksTotal sacks of barite required 933.3 sacks

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

Current Mud Weight, ppg 10.0 ppgNew Mud Weight, ppg 13.0 ppgTotal mud in the system 500.0 bbl

Volume in bbl increase per 100 bbl of mud 11.11 bblTotal volume increase in bbl 55.56 bbl

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

Current Mud Weight in ppg 10.0 ppgNew Mud Weight in ppg 13.0 ppg

Final volume in bbl 100.0 bblStarting volume in bbl 90.00 bbl


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Input cells

Calculated cellsBack to the first page

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

Reference

http://www.drillingformulas.com/volume-of-mud-increases-due-to-adding-hematite/

olume of desired mud weight with Hematite

Reference

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/http://www.drillingformulas.com/starting-volume-weight-up-with-hematite/http://www.drillingformulas.com/volume-of-mud-increases-due-to-adding-hematite/http://www.drillingformulas.com/increase-mud-weight-by-adding-hematite/


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Increase Mud Density by adding Carbonate

Current Mud Weight, ppg 10.0 ppg

New Mud Weight, ppg 13.0 ppgTotal mud in the system 500.0 bbl

Sacks of Barite per 100 bbl of mud 298 sacksTotal sacks of barite required 1492 sacks

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

Current Mud Weight, ppg 10.0 ppgNew Mud Weight, ppg 13.0 ppgTotal mud in the system 500.0 bbl

Volume in bbl increase per 100 bbl of mud 31.58 bblTotal volume increase in bbl 157.89 bbl


Current Mud Weight in ppg 10.0 ppgNew Mud Weight in ppg 13.0 ppg

Final volume in bbl 100.0 bblStarting volume in bbl 76.00 bbl


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Input cellsCalculated cells


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

Reference

http://www.drillingformulas.com/volume-of-mud-increase-due-to-adding-calcium-carbonate/

olume of desired mud weight with Carbonate

Reference

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/http://www.drillingformulas.com/starting-volume-of-original-mud-weight-up-with-calcium-carbonate/http://www.drillingformulas.com/volume-of-mud-increase-due-to-adding-calcium-carbonate/http://www.drillingformulas.com/increase-mud-weight-by-adding-calcium-carbonate/


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Increase Mud Density by adding Barite

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

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

Current Mud Weight, ppg 10.0 ppgNew Mud Weight, ppg 13.0 ppg

Total mud in the system 500.0 bblVolume in bbl increase per 100 bbl of mud 13.64 bblTotal volume increase in bbl 68.18 bbl


Current Mud Weight in ppg 10.0 ppg

New Mud Weight in ppg 13.0 ppgFinal volume in bbl 100.0 bblStarting volume in bbl 88.00 bbl


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Input cells

Calculated cellsBack to the first page

Reference

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

Reference

http://www.drillingformulas.com/volume-of-mud-increase-due-to-mud-weight-increase-by-adding-barite/

olume of desired mud weight with Barite

Reference

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

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/http://www.drillingformulas.com/starting-volume-of-original-mud-weight-up-with-barite/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/starting-volume-of-original-mud-weight-up-with-barite/http://www.drillingformulas.com/volume-of-mud-increase-due-to-mud-weight-increase-by-adding-barite/http://www.drillingformulas.com/increase-mud-weight-by-adding-barite/


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Pressure required to break circulation

Pressure required overcoming the muds gel strength inside the drill string.

10 min get strenght of mud, lb/100 sq ft 12 lb/100 sq ftInside diameter of drill pipe in inch 3.32 in

Length of drill string in ft 11500 ftPressure required to break circulation inside drill string 138.6 psi

Pressure required overcoming the muds gel strength in the annulus.

10 min get strenght of mud, lb/100 sq ft 12 lb/100 sq ftOutside diameter of drill pipe in inch 4 in

Hole diameter in inch 6.5 inLength of drill string in ft 11500 ftPressure required to break circulation inside drill string 184.0 psi


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Input cellsCalculated cellsBack to the first page

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

Reference

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

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


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Light weight spot fill to balance formation pressure

Input cellsCurrent mud weight, ppg 13 ppg Calculated cells

Overblance with current mud weight, psi 300 psi Back to the first pageWeigth of light weight pill, ppg 8.3 ppg ReferenceHeight of light weight pill, ft, in annulus 1227 ft http://www.drillingformu

Websitehttp://www.drillingformu

You must ensure than height of light weight pill in the annulus must less than 1227 ft in order
http://www.drillingformulas.com/determine-height-of-light-weight-spot-pill-to-balance-formation-pressure/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/determine-height-of-light-weight-spot-pill-to-balance-formation-pressure/


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las.com/determine-height-of-light-weight-spot-pill-to-balance-formation-pressure/

las.com/o prevent wellcontrol situation.


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

Current Mud Weight in ppg 13 ppg Input cells

Water Weight in ppg 8.6 ppg Calculated cellsTVD in ft 6000 ft Back to the first pageAnnular Capacity in bbl/ft 0.1422 bbl/ft

Water filled into annulus in bbl 140 bblFeet of water in annuls 984.5 ft ReferenceHydrostaic Pressure decrease 225.3 psi http://www.drillingformulas.com/loss-of-hydEquivalent Mud Weigth at TD 12.3 ppg Website

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


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

OD 9.625 inch Input cells

ID 8.835 inch calculated cellsDisplacment in bbl/ft 0.01417 bbl/ft Back to the first page

Referencehttp://www.drillingformulas.com/pipe-displace

Website



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Sutck Pipe Calculation

Stretch in inch 5 inch Input cells

Free point constant 28634.51 calculated cellsPull force in Klb 100 Klb Back to the first pageDepth of stuck pipe 1431.73 ft

Free Point Constant (FPC) calculation

Outside 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 inch

Depth of stuck pipe 1431.73 ft


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Accumulator Capacity

Suface Application Input cells

Volume per bottle 10 gal calculated cellsPre-charge pressure 1000 psi Back to the first pageMinimum System Pressure 1200 psi

Operating Pressure 3000 psi ReferenceUsable Volume per bottle 5.00 gal http://www.drillingformulas.com/a

Subsea Application

Volume per bottle 10 galPre-charge pressure 1000 psiMinimum System Pressure 1200 psi

Operating Pressure 3000 psi ReferencePressure gradient of hydraulic fluid 0.445 psi/ft http://www.drillingformulas.com/aWater depth 1500 ft WebsiteUsable Volume per bottle 4.38 gal http://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/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/accumulator-capacity-usable-volume-per-bottle-calculation-for-subsea-bop/http://www.drillingformulas.com/accumulator-capacity-usable-volume-per-bottle-calculation-surface-stack/


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cumulator-capacity-usable-volume-per-bottle-calculation-for-subsea-bop/


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Calculate capacity in bbl/ft Input cells

Hole size, Casing ID, Tubing ID, etc 6.125 calculated cellsCapacity in bbl/ft 0.0364 Back to the first page

Calculate capacity in ft/bbl

Hole size, Casing ID, Tubing ID, etc 6.125 ReferenceCapacity in ft/bbl 27.4392 http://www.drillingformulas.com/cal

Website

Calculate capacity in gal/ft http://www.drillingformulas.com/Hole size, Casing ID, Tubing ID, etc 6.125Capacity in gal/ft 1.5306

Calculate capacity in ft/gal

Hole size, Casing ID, Tubing ID, etc 6.125Capacity in ft/gal 0.6533

Calculate inner capacity of open hole, inside cylindrical objects such as tubulars, drill pipe, drill coll

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


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ars, tubing, casing


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

Calculate annular capacity in bbl/ft Input cellsHole size, casing ID in inch 8.5 calculated cellsDrill pipe size, DC size or casing/tubing OD 5 Back to the first pageAnnular capacity, bbl/ft 0.04590

Calculate annular capacity in ft/bbl

Hole size, casing ID in inch 6.125 ReferenceDrill pipe size, DC size or casing/tubing OD 3.5 http://www.drillingformuAnnular capacity, ft/bbl 40.743 Website

http://www.drillingformu

Calculate annular capacity in gal/ft

Hole size, casing ID in inch 6.125Drill pipe size, DC size or casing/tubing OD 3.5Annular capacity, gal/ft 1.031

Calculate annular capacity in ft/gal

Hole size, casing ID in inch 6.125Drill pipe size, DC size or casing/tubing OD 3.5Annular capacity, ft/gal 0.970
http://www.drillingformulas.com/calculate-annular-capacityhttp://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/calculate-annular-capacity


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las.com/calculate-annular-capacity

las.com/


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Cost Per Foot Calculation

Input cellsBit cost (B), $ 27000 calculated cells

Rig cost (CR), $/hr 3500 Back to the first pageRotating time (t), hrs 50Round trip time (T), hrs 12 Reference

Footage per bit (F), ft 5000 http://www.drillingformulas.com/drilling-cost-pCost per foot , $/ft 48.80 Website

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


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Pump Pressure and Pump Stroke Relationship

Basic Calculation Input cells

calculated cellsCurrent Circulating Pressure, psi 2500 Back to the first pageOld Pump Rate, SPM 40

New Pump Rate, SPM 25New Circulating Pressure, psi 976.6

Advanced calculation (Determine factor)

Pressure 1, psi 2700Flow rate1, gpm 320Pressure 2, psi 500

Flow rate2, gpm 130Factor 1.872Current Circulating Pressure, psi 2500 ReferenceOld Pump Rate, SPM 40 http://www.drillingformulas.com/pu

New Pump Rate, SPM 25 WebsiteNew Circulating Pressure, psi 1037.0 http://www.drillingformulas.com/
http://www.drillingformulas.com/pump-pressure-and-pump-stroke-relationship/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/pump-pressure-and-pump-stroke-relationship/


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Hydraulic Horse Power (HPP)

Circulating Pressure, psi 3500 Input cells

Flow rate, GPM 800 calculated cellsHydraulic Horse Power (HPP) 1633.61 Back to the first page

Reference

http://www.drillingformulas.com/hydraulic-hors

Website

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


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Formation TemperatureInput cells

Surface Temperature, F 90 calculated cellsTemperature Gradient, F/ft 0.015 Back to the first page

Formation Depth in TVD, ft 12000

Formation Temperature, F 270 Referencehttp://www.drillingformulas.com/formation-tem

Website

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


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Critical RPM to prevent pipe failure due to high vibration

Just rough estimate 15% accurate Input cellscalculated cells

Length of one joint of drill pipe, ft 32 Back to the first pageOD of drill pipe, inch 4ID of drill pipe, inch 3.5 Reference

Critical RPM 172 http://www.drillingformulas.com/critWebsite

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


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Calculate Equivalent Circulating Density with Engineering Formula

Mud weight 12.4 Input cells

Reading at 300 51 calculated cellsReading at 600 87 Back to the first pagePV 36

Pump 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 383.5

Annular 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 4.3 http://www.drillingformulas.com/calTotal annular pressure loss 372.0 Website

ECD at 9344' TVD in ppg 13.17 http://www.drillingformulas.com/
http://www.drillingformulas.com/calculate-equivalent-circulation-density-ecd-with-complex-engineering-equations/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/calculate-equivalent-circulation-density-ecd-with-complex-engineering-equations/


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Annular Pressure Loss

Mud Weight in ppg 13.0 Input cells

Length in ft 8000.0 calculated cellsFlow rate in GPM 320.0 Back to the first pageDh, in 6.50

Dp, in 4.00 Referencevelocity, ft/min 298.7 http://www.drillingformulas.com/calcuate-annulP loss annular in psi 531.65 Website

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


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Direcional Survey Calculation

Angle Averaging Method

Survey1 Survey2Depth (ft) 7482 7782 Input cellsInclination (degree) 4 8 calculated cells

Azimuth (degree) 10 35 Back to the first page

North 28.97 ft ReferenceEast 12.00 ft http://www.drillingformulas.com/angle-averagiVertical 298.36 ft Website

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


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Radius of Curvature Method

Input cells

Survey1 Survey2 calculated cellsDepth (ft) 7482 7782 Back to the first pageInclination (degree) 4 8

Azimuth (degree) 10 35Reference

North 28.74 ft http://www.drillingformulas.com/radius-of-curvEast 11.90 ft WebsiteVertical 298.30 ft http://www.drillingformulas.com/
http://www.drillingformulas.com/radius-of-curvature-method/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/radius-of-curvature-method/


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Balanced Tangential Method

Input cells

Survey1 Survey2 calculated cellsDepth (ft) 3500 3600 Back to the first pageInclination (degree) 15 25

Azimuth (degree) 20 45Reference

North 27.10 ft http://www.drillingformulas.com/balanced-tangEast 19.37 ft WebsiteVertical 93.61 ft http://www.drillingformulas.com/
http://www.drillingformulas.com/balanced-tangential-method-calculation/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/balanced-tangential-method-calculation/


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Minimum Curvature Method Input cellscalculated cells

Survey1 Survey2 Back to the first pageDepth (ft) 3500 3600Inclination (degree) 15.00 25.00

Azimuth (degree) 20.00 45.00

0.22605 radians ReferenceRF 1.00428 http://www.drillingformulas.com/minimum-curvNorth 27.22 ft WebsiteEast 19.45 ft http://www.drillingformulas.com/Vertical 94.01 ft
http://www.drillingformulas.com/minimum-curvature-method/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/minimum-curvature-method/


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Tangential Method

Input cells

Survey1 Survey2 calculated cellsDepth (ft) 3500 3600 Back to the first pageInclination (degree) 15.00 25.00

Azimuth (degree) 20.00 45.00Reference

North 29.88 ft http://www.drillingformulas.com/tangential-metEast 29.88 ft WebsiteVertical 90.63 ft http://www.drillingformulas.com/


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Calculate dogleg severity between 2 survey points based on Radius of Curvature MetSurvey1 Survey2

Depth (ft) 4231 4262 Input cellsInclination (degree) 13.5 14.7 calculated cellsAzimuth (degree) 10 19 Back to the first page

Dogleg severity 8.05 degree/100 ft Referencehttp://www.drillingformulas.com/do

Website

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


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leg-severity-calculationbased-on-radius-of-curvature-method/


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Calculate dogleg severity between 2 survey points based on tangential methodSurvey1 Survey2 Input cells

Depth (ft) 4231 4262 calculated cellsInclination (degree) 13.5 14.7 Back to the first pageAzimuth (degree) 10 19

Reference

Dogleg severity 3.23 degree/100 ft http://www.drillingformulas.com/doWebsite

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


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Determine force with given pressure and area

Pressure 500 psi Input cells

Area 3 in2 calculated cellsForce 1500 lb Back to the first page

or

Determine force with given pressure and diameter Reference

Pressure 500 psi http://www.drillingformulas.com/preDiameter 3 in WebsiteForce 3534.3 lb http://www.drillingformulas.com/
http://www.drillingformulas.com/pressure-and-force-relationship-and-applications/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/pressure-and-force-relationship-and-applications/


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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 ft Back to the first pageLOT equivalent mud weight 16.9 ppg

Reference


Website

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


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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


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Input cellscalculated cellsBack to the first page

Reference

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

Website

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


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Equivalent Circulating Density (ECD), ppgAnnular pressure loss(psi) 400 psi Input cellsMud weight (ppg) 10 ppg calculated cellsTVD (ft) 8000 ft Back to the first pageECD 11.0 PPG

Reference

http://www.drillingformulas.com/equivalent-circWebsite

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


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

Specific gravity using pressure gradient, psi/ft

Pressure gradient (psi/ft) 0.50 psi/ftSG 1.15

Specific gravity using mud weight, lb/ft3Mud 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

Convert specific gravity to mud weight, lb/ft3SG 1.50Mud weight (lb/ft3) 93.600 lb/ft3


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Input cells

calculated cellsBack to the first page

Websitehttp://www.drillingformulas.com/

Reference

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

Reference

http://www.drillingformulas.com/convert-specific-gravity-to-mud-weight-ppg-and-lbft3-and-pressure-grad
http://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/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/http://www.drillingformulas.com/


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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


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Input cells


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

Website

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


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Barrels of slug required for a desired length of dry pipe

Desired length of dry pipe (ft) 400 ft

Drill 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 ft

Slug Volume 69.00 bbl

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

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


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Input cells


Website


Reference

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


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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 Back to the first page

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

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


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Annular Velocity (AV) in ft/minFormula 1: AV = pump output, bbl/min annular capacity, bbl/ft

Pump out put (bbl/min) 10 bbl/minAnnular capacity (bbl/ft) 0.13 bbl/ft

Annular Velocity (AV) 76.92 ft/min

Formula 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/min

Formula 3: flow rate in bbl/min and diameter

Flow 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, etc

Annular 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/sec

Pump output in gpm required for a desired annular velocity, ft/mim

Annular Velocity (ft/min) 120 ft/minBigger diameter (in) 10 in

Smaller diameter (in) 5 inRequired pump rate (gpm) 367.35 gpm

Strokes per minute (SPM) required for a given annular velocity

Annular Velocity (ft/min) 150 ft/min

Bigger diameter (in) 10 inSmaller diameter (in) 5 inPump out put (bbl/stk) 0.1 bbl/stkSPM required 109.29 spm


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Input cellscalculated cells


Reference

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

Website

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


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Pump outTriplex Pump, bbl/stk Input cellsefficiency (%) 97 calculated cellsLiner diameter (in) 6 in Back to the first pageStroke length (in) 12 in

PO (bbl/stk) 0.10183 bbl/stk

Duplex Pump , bbl/stkefficiency (%) 85Liner diameter (in) 6 in ReferenceRod diameter (in) 2 in http://www.drillingformulas.com/pump-output-calculation-fStroke length (in) 12 in WebsitePO (bbl/stk) 0.11236 bbl/stk http://www.drillingformulas.com/
http://www.drillingformulas.com/pump-output-calculation-for-duplex-pump-and-triplex-pump/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/pump-output-calculation-for-duplex-pump-and-triplex-pump/


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Buoyancy Factor (BF)

Buoyancy factor using mud weight, PPG Input cellsMW (PPG) 13 calculated cellsBF 0.802 Back to the first page

Buoyancy factor using mud weight, lb/ft3

Reference

MW (lb/ft3) 100 http://www.drillingformulas.com/buBF 0.796 Website

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


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oyancy-factor-calculation/


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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


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Reference

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

Website

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


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

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

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


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Reference

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

Website

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


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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

http://www.drillingformul

Convert temperature, Celsius (C) to Kelvin (K) WebsiteC 23 http://www.drillingformulK 296.2

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

R 609.7
http://www.drillingformulas.com/temperature-conversion-formulas/http://www.drillingformulas.com/http://www.drillingformulas.com/http://www.drillingformulas.com/temperature-conversion-formulas/


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las.com/temperature-conversion-formulas/

las.com/


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Accumulator Pre-charge Pressure

P start 3000 Input cells

P final 2000 calculated cellsVolume removed 25 Back to the first pageVolume total 200

Average pre charge pressure 750


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Bulk Density of Cuttings by using Mud Balance

Procedure 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.

5. Move counterweight to obtain new balance. This value is Rw = resulting weight with cuttings p

RW, ppg 14

SG 3.13


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Reference

lus water, ppg. http://www.drillingformulas.com/bulk-density-cuttings-using-mud-balance/Website

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


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How many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (pHydrostatic pressure to lose 200 psiCasing capacity 0.0873 bbl/ft Input cells

Pipe displacement 0.01876 bbl/ft calculated cellsMud weight 12 PPG Back to the first pageFeet of drill pipe pulled 1171 ft

How many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (p% 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/drilCasing capacity 0.0873 bbl/ft WebsiteMud Weight 12 PPG http://www.drillingformulas.com/Feet of drill pipe pulled 833 ft


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si) when pull dry.

si) when pull wet.

l-pipe-pulled-to-lose-hydrostatic-pressure/


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Hydrostatic Pressure (HP) Decrease When POOHWhen pulling DRY pipe Input cellsStands pulled 10 stands calculated cellsLength per stand 91 ft Back to the first pagePipe displacement 0.0055 bbl/ft

Casing capacity 0.0873 bbl/ftMud Weight 12 PPG ReferenceBBL displace 5.01 bbl http://www.drillingformuHP decrease (psi) 38.18 psi Website


When pulling WET pipe

% of volume in drill pipe outof hole 100Stands pulled 10 standsLength per stand 91 ftPipe displacement 0.0055 bbl/ftPipe capacity 0.01876 bbl/ft

Casing capacity 0.0873 bbl/ftMud Weight 12.0 PPGBBL displace 22.08 bblHP decrease (psi) 218.52 Psi


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las.com/hydrostatic-pressure-decrease-when-pooh/

las.com/


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Depth of washout

Method 1:

Strokes pumped till pressure increase 400 strokes Input cellsInternal capacity of drill pipe 0.00742 bbl/ft calculated cells

Pump output 0.0855 bbl/stk Back to the first pageDepth of washout 4609 ft

Method 2:

Strokes pumped till material seen 2500 strokesInternal capacity of drill pipe 0.00742 bbl/ft

Annulus capacity 0.0455 bbl/ft ReferencePump output 0.0855 bbl/stk http://www.drillingformulVolume from bell nipple to shale shakers 10 bbl WebsiteDepth of washout 3850 ft http://www.drillingformul

The concept of this method is to pump plugging material tpump till pressure increase then we can calculate back wh

The concept of this method is to pump material that can binto annulus and over the surface. We can calculate the dinternal drill pipe volume and annulus volume.


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as.com/depth-of-washout/

as.com/

plug the wash out. We will know how many stroksere the washout is.

easily observed from drill pipe pass through wash outepth of washout bases on the combination volume of

drilling formulas calculation shee v1.1 1

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