Category

Drilling Engineering

235 items

Accumulator capacity

Accumulator precharge pressure

Amount of additive required to achieve a required cement slurry density

Amount of cement to be left in casing

Amount of mud required to displace cement in drillpipe

Angle of twist - Rod subjected to torque

Annular capacity between casing and multiple strings of tubing

Annular capacity between casing and multiple tubing strings

Annular velocity - Using circulation rate in Gpm

Annular velocity - Using pump output in bbl/min

Annular velocity for a given circulation rate

Annular velocity for a given pump output

Annular volume capacity of pipe

API water loss calculations

Area below the casing shoe

Axial loads in slips

Beam force

Bit nozzle pressure loss

Bit nozzle selection - Optimized hydraulics for two and three jets

Borehole torsion - Cylindrical helical method

Bottomhole annulus pressure

Bottomhole assembly length required for a desired weight on bit

Bulk density of cuttings - Using the mud balance

Bulk modulus using Poisson's ratio and Young's modulus

Buoyancy weight

Buoyancy factor

Buoyancy factor using mud weight

Calculations for the number of feet to be cemented

Calculations required for spotting pills

Capacity formulas - bbl/ft

Capacity formulas - gal/ft

Capacity of tubulars and open-hole

Combined solubility - Hydrocarbon gas, CO2, and H2S - in each of the mud components

Control drilling - Maximum drilling rate

Conversion of pressure into the mud weight

Cost per foot during drilling

Cost per foot of coring

Critical annular velocity and critical flow rate

Critical flow rate for flow regime change

Critical velocity for change in flow regime

Crown block capacity

Current drag force - Offshore

Curvature radius for a borehole

Cutting slip velocity

Cuttings produced per foot of hole drilled - bbls

Cuttings produced per foot of hole drilled - lbs

D-Exponent

Depth of a washout - Method 1

Depth of a washout - Method 2

Derrick efficiency factor

Difference in pressure gradient between the cement and mud

Differential hydrostatic pressure between cement in the annulus and mud inside the casing

Dilution of a mud system

Direction of dip

Directional curvature for a deviated well

Downward force or weight of casing

Drill pipe or drill collar capacity

Drill pipe or drill collar displacement and weight

Drill string design - Drill pipe length for bottomhole assembly

Drilled gas entry rate

Drilling cost per foot

Drilling ton miles - Coring operation ton miles

Drilling ton miles - Drilling/connection ton miles

Drilling ton miles - Round trip ton miles

Drilling ton miles - While making short trip ton miles

Drilling ton miles - Setting casing ton miles

Duplex pump factor

Duplex pump output - Using liner diameter

Duplex pump output - Using rod diameter

Duplex pump output by using liner and rod diameters

Dynamically coupled linear flow - Formation invasion

Effective weight during drilling

Effective wellbore radius for finite-conductivity fractures

Effective wellbore radius in infinite-conductivity fractures

Efficiency of block and tackle system

Equivalent area of pipe subject to uniform axial force

Equivalent circulating density

Equivalent density of a wellbore fluid

Equivalent formation water resistivity from SP log

Equivalent mud weight - Deviated well

Equivalent mud weight - Vertical well

Evaluation of centrifuge

Evaluation of hydrocyclone

Fluid volume required to spot a plug

Force applied to stretch material

Force exerted by the fluid on the solid surface of flow through an annulus

Friction factor in drill pipe

Front displacement of a particle in the reservoir - Formation invasion

Gas migration velocity

Gas solubility in a mud system

Gas/mud ratio

Gel strength - Optimal solid removal efficiency

Gel strength - Solid control efficiency

Gel strength - Solids build-up in system

Height of cement in the annulus

Hydraulic horsepower

Hydraulics analysis

Hydromechanical specific energy

Hydrostatic pulling

Hydrostatic pulling wet pipe out of the hole

Hydrostatic pressure in annulus due to slug

Hydrostatic pressure decrease at total depth caused by gas-cut mud

Impact force - Nozzle hydraulic analysis

Impringing jet

Increase mud density by barite

Increase mud density by calcium carbonate

Increase mud density by hematite

Increase volume by barite

Increase volume by calcium carbonate

Increase volume by hematite

Initial volume required to achieve a volume with barite

Initial volume required to achieve a volume with calcium carbonate

Initial volume required to achieve a volume with hematite

Injection/casing pressure required to open valve

Input power of a pump - Using fuel consumption rate

Jet velocity - Nozzle hydraulic analysis

Kick analysis - Influx

Kick analysis - Formation pressure with well shut-in on a kick

Kick analysis - Maximum pit gain from a gas kick in water-based mud

Kick analysis - Maximum surface pressure from a gas kick in water-based mud

Kick analysis - Shut-in drill pipe pressure

Kick analysis - Height of influx

Kill weight mud determination - Moore equation

Kinetic friction

Laser specific energy

Lateral load imposed on a casing centralizer - Cementing

Lateral load imposed on a casing centralizer with a dogleg - Cementing

Linear annular capacity of pipe

Linear capacity of pipe

Load to break cement bond - Cementing

Mass rate of flow through annulus

Matching conditions at the cake-to-rock interface - Formation invasion

Maximum allowable mud weight

Maximum drilling rate - Larger holes

Maximum equivalent derrick load

Maximum length of a slanted well in a given reservoir thickness

Maximum length of drillpipe for a specific bottomhole assembly

Maximum recommended low-gravity solids

Maximum recommended solids fractions in drilling fluids

Maximum weight on bit

Mechanical energy balance for wellbore fluids

Mechanical specific energy

Mud rheology - Herschel and Buckley law

Mud rheology - Power-law model - Consistency index

Mud rheology - Power-law model - Power-law index

Mud rheology - Power-law

Mud rheology calculations - Bingham plastic model

Mud weight increase required to balance pressure

Mud weight reduction by dilution - Water/diesel/any liquid

Mudcake growth equation - Formation invasion

Mudcake growth equation 2 - Formation invasion

Mudcake permeability - Formation invasion

New pump circulating pressure

Nozzle area calculation

Number of sacks of cement required

Number of sacks of cement required for a given length of plug

Number of sacks of lead cement required for annulus

Number of sacks of tail cement required for casing

Open-ended displacement volume of pipe

Overall efficiency - Diesel engines to mud pump

Overall power system efficiency

Penetration rate - Drill-rate model - Alternative equation

Penetration rate - Drill-rate model - Basic equation

Percentage of bit nozzle pressure loss

Plastic viscosity - Bingham plastic model

Plug length to set a balanced cement plug

Polar moment of inertia

Polished rod horsepower - Sucker-rod pump

Pore-pressure gradient - Rehm and McClendon

Pore-pressure gradient - Zamora

Pressure analysis - Pressure by each barrel of mud in casing

Pressure analysis - Surface pressure during drill stem test

Pressure gradient

Pressure required to break circulation - Annulus

Pressure required to break circulation - Drill string

Pressure required to overcome gel strength of mud inside the drill string

Pressure required to overcome mud's gel strength in annulus

Pump calculation - Pump pressure

Pump calculations - Power required

Pump displacement

Pump flow rate

Pump head rating

Pump output - gpm

Pump output triplex pump

Pump pressure/pump stroke relationship

Radial force related to axial load - Cementing

Range of load - Sucker-Rod pump

Rate of fuel consumption by a pump

Rate of gas portion that enters the mud

Relationship between traveling block speed and fast line speed

Rock removal rate

Rotating horsepower

Side force at bit in anisotropic formation

Sinusoidal buckling

Slurry density for cementing calculations

Solids analysis-High-salt content muds

Solids analysis low-salt content muds

Spacer volume behind slurry required to balance the plug

Specific gravity of cuttings by using mud balance

Stripping/snubbing calculations - Breakover point between stripping and snubbing

Stripping/snubbing calculations - Height gain and casing pressure from stripping into influx

Stripping/snubbing calculations - Maximum Allowable surface pressure governed by casing burst pressure

Stripping/snubbing calculations-Maximum allowable surface pressure governed by formation

Stripping/snubbing calculations - Minimum surface pressure before stripping

Stripping/snubbing calculations - Constant BHP with a gas bubble rising

Stroke per minute required for a given annular velocity

Stuck pipe calculations - Method-1

Stuck pipe calculations - Method-2

Subsea considerations - Adjusting choke line pressure loss for higher mud weight

Subsea considerations - Casing burst pressure-subsea stack

Subsea considerations - Choke line pressure loss

Subsea considerations - Maximum allowable mud weight - Subsea stack from leakoff test

Subsea considerations - Casing pressure decrease when bringing well on choke

Subsea considerations - Velocity through choke line

Surface test pressure required to frac the formation

Total amount of solids generated during drilling

Total heat energy consumed by the engine

Total number of sacks of tail cement required

Total water requirement per sack of cement

Triplex pump factor

Upward force acting at the bottom of the casing shoe

Vertical curvature for deviated wells

Viscous shear stress at the outer mudcake boundary

Volume of cuttings generated per foot of hole drilled

Volume of dilution water or mud required to maintain circulating volume

Volume of fluid displaced for duplex pumps

Volume of fluid displaced for single-acting pump

Volume of fluid displaced for triplex pump

Volume of liquid (oil plus water) required to prepare a desired volume of mud

Volume of slurry per sack of cement

Volumes and strokes-Annular volume

Volumes and strokes - Drill string volume

Volumes and strokes - Total strokes

Weight of additive per sack of cement

Weighted cementing calculations

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