Drilling Formulas application is developed by DrillingFormulas.com in order to help oilfield personnel to access oilfield formulas via mobile Android devices. In this application, there are a total of 119 helpful drilling formulas which cover several areas such as Applied Drilling, Basic Drilling Formulas, Directional Drilling, Drilling Fluid, Drilling Engineering, Hydraulics, Well Control and Drill String. This is excellent for people working on drilling, workover and completion, etc.

Download App Here – Drilling Formula App

The app is very easy to use. Users can scroll down to the calculation and click, and then they will see the input cells. Once the input cells are input, click a “Calculate” to figure out the result or a “Clear” to delete input data.

The main page of the app is shown in the image below.

Drilling Formulas App Screen Shot

Download App Here – Drilling Formula App

These drilling formulas are in this current version (March-2015).

Applied Drilling Formulas

• Drill Collar Weight for Vertical Wells
• Drill Collar Weight for Deviated Wells
• Effective Mud Density
• Equivalent Circulating Density (ECD) Using Yield Point for MW less than or equal to 13 ppg
• Equivalent Circulating Density (ECD) Using Yield Point for MW more than 13 ppg
• Lag time
• Light weight spot fill to balance formation pressure
• Loss of hydrostatic pressure due to filling water into annulus in case of lost return
• Margine of Overpull
• Maximum ROP Before Fracturing Formation
• Pipe Elongation Due to Temperature
• Pressure required to break circulation inside drillstring
• Pressure required to break circulation in annulus
• Pump out (Triplex pump)
• Pump out (Duplex pump)
• Pump Pressure and Pump Stroke Relationship – Simple Formula
• Pump Pressure and Pump Stroke Relationship – Advanced Formula
• Stuck Pipe Calculation
• Free Point Constant for Stuck Pipe Calculation
• Stuck Pipe Calculation – Not Know Free Point Constant
• Ton Miles Calculation
• Volume of Cutting Generated While Drilling

Basic Drilling Formulas

• Accumulator Capacity for Surface Stack
• Accumulator Capacity for Subsea Stack
• Amount of cuttings drilled per foot of hole drilled
• Annular Capacity
• Annular Velocity (AV)
• Buoyancy Factor (BF)
• Buoyancy Factor (BF) with different fluid weight inside and outside
• Convert Temperature Unit
• Converting Pressure into Mud Weight
• Coring Cost Per Footage Recovered
• Depth of washout
• D-Exponent
• D-Exponent Corrected
• Displacement of plain pipe such as casing, tubing, etc.
• Drilling Cost Per Foot
• Equivalent Circulating Density (ECD)
• Formation Integrity Test (FIT)
• Formation Temperature
• How many feet of drill pipe pulled to lose certain amount of hydrostatic pressure (psi)
• Hydrostatic Pressure (HP)
• Hydrostatic Pressure (HP) Decrease When POOH
• Inner Capacity of open hole, inside cylindrical objects
• Leak Off Test (LOT)
• Pressure and Force
• Pressure Gradient
• Slug Calculation – Barrels of slug required for a desired length of dry pipe
• Slug Calculation – Weight of slug required for a desired length of dry pipe with a set volume of slug
• Specific Gravity (SG)

Directional Drilling Calculation

• Directional Survey – Angle Averaging Method
• Directional Survey – Radius of Curvature Method
• Directional Survey – Balanced Tangential Method
• Directional Survey – Minimum Curvature Method
• Directional Survey – Tangential Method
• Dogleg Severity Calculation based on Radius of Curvature Method
• Dogleg Severity Calculation based on Tangential Method

Drilling Fluid Formulas

• Bulk Density of Cuttings by using Mud Balance
• Decrease oil water ratio
• Determine oil water ratio from a retort analysis
• Determine the density of oil/water mixture
• Dilution to control LGS
• Increase mud weight by adding Barite
• Volume of mud in bbl increase due to mud weight increase by adding Barite
• Starting volume of original mud – weight up with Barite
• Increase mud weight by adding Calcium Carbonate
• Volume of mud in bbl increase due to mud weight increase by adding Carbonate
• Starting volume of original mud – weight up with Carbonate
• Increase mud weight by adding Hematite
• Volume of mud in bbl increase due to mud weight increase by adding Hematite
• Starting volume of original mud – weight up with Hematite
• Increase oil water ratio
• Mixing Fluids of Different Densities with Pit Space Limitation
• Mixing Fluids of Different Densities without Pit Space Limitation
• Plastic Viscosity (PV) and Yield Point (YP) from mud test
• Reduce mud weight by dilution
• Solid Density From Retort Analysis

Engineering Formulas

• Annular Pressure Loss
• Critical RPM
• Calculate Equivalent Circulating Density with Engineering Formula
• Bottom Hole Pressure from Wellhead Pressure in a Dry Gas Well

Drilling Hydraulic Formulas

• Critical Flow Rate
• Cutting Carrying Index
• Cutting Slip Velocity Method#1
• Cutting Slip Velocity Method#2
• Effective Viscosity
• Hydraulic Horse Power (HPP)
• Optimum Flow Rate for basic system
• Power Law Constant
• Pressure Loss Annulus
• Pressure Loss Annulus With Tool Joint Correction
• Pressure Loss Drillstring
• Pressure Loss Drillstring With Tool Joint Correction
• Pressure Loss in Surface Equipment
• Reynold Number
• Surge and Swab Pressure Method#1
• Surge and Swab Pressure Method#2

Well Control Formulas

• Actual gas migration rate in a shut in well
• Adjusted maximum allowable shut-in casing pressure for new mud weight
• Calculate Influx Height
• Estimate gas migration rate with an empirical equation
• Estimate type of influx
• Formation pressure from kick analysis
• Hydrostatic Pressure Loss Due to Gas Cut Mud
• Kick tolerance factor (KTF)
• Kill Weight Mud
• Maximum formation pressure (FP)
• Maximum influx height
• Maximum Initial Shut-In Casing Pressure (MISICP)
• Maximum pit gain from gas kick in water based mud
• Maximum Surface Pressure from Gas Influx in Water Based Mud
• Maximum surface pressure from kick tolerance information
• Trip margin
• Initial Circulating Pressure (ICP)
• Final Circulating Pressure (FCP)
• New Pump Pressure With New Strokes (psi)
• New Pressure Loss With New Mud (psi)
• Riser Margin

Drill String

• Tensile Capacity of Drill String