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Drilling Engineering
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Drilling Engineering
235 items
Accumulator capacity
Annular velocity - Using pump output in bbl/min
Hydrostatic pulling
Accumulator precharge pressure
Borehole torsion - Cylindrical helical method
Specific gravity of cuttings by using mud balance
Amount of additive required to achieve a required cement slurry density
Capacity formulas - bbl/ft
Amount of cement to be left in casing
Critical flow rate for flow regime change
Amount of mud required to displace cement in drillpipe
Depth of a washout - Method 2
Angle of twist - Rod subjected to torque
Drill string design - Drill pipe length for bottomhole assembly
Annular capacity between casing and multiple strings of tubing
Duplex pump output - Using rod diameter
Annular capacity between casing and multiple tubing strings
Equivalent formation water resistivity from SP log
Annular velocity - Using circulation rate in Gpm
Gas migration velocity
Annular velocity for a given circulation rate
Increase volume by calcium carbonate
Annular velocity for a given pump output
Kick analysis - Maximum pit gain from a gas kick in water-based mud
Annular volume capacity of pipe
Linear capacity of pipe
API water loss calculations
Maximum recommended solids fractions in drilling fluids
Area below the casing shoe
Mud weight reduction by dilution - Water/diesel/any liquid
Axial loads in slips
Open-ended displacement volume of pipe
Beam force
Pore-pressure gradient - Rehm and McClendon
Bit nozzle pressure loss
Pump calculations - Power required
Bit nozzle selection - Optimized hydraulics for two and three jets
Rate of gas portion that enters the mud
Bottomhole annulus pressure
Subsea considerations - Adjusting choke line pressure loss for higher mud weight
Bottomhole assembly length required for a desired weight on bit
Total water requirement per sack of cement
Bulk density of cuttings - Using the mud balance
Volume of liquid (oil plus water) required to prepare a desired volume of mud
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 - 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 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
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
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 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 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 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 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 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 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
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 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
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
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 - 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 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
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
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 - 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
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 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