**Drilling Formulas Spread Sheet V1.7 **is the latest version of Drilling Formula Spread Sheet. There are few new cement plug formulas and all formulas are unlocked so you can apply the formulas for your work. The formulas in this spreadsheet are as follows;

**Applied Drilling Formulas**

Drill Collar Weight

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

Margin of Over Pull (MOP)

Maximum ROP Before Fracturing Formation

Pipe Elongation Due to Temperature

Pressure required to break circulation

Pump out (both duplex and triplex pump)

Pump Pressure and Pump Stroke Relationship

Stuck Pipe Calculation

Ton Miles Calculation

Volume Gain from Slug

Volume of Cutting Generated While Drilling

**Basic Drilling Formulas**

Accumulator Capacity

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

Buoyed Weight of Tubular With Different Fluid Weight Outside and Inside

Buoyed Weight of Tubular With Fluid in Pipe

Buoyed Weight of Tubular Without Fluid in Close Ended Pipe (Empty Pipe)

Closed-Ended Pipe Displacement

Convert Temperature Unit

Converting Pressure into Mud Weight

Coring Cost Per Footage Recovered

Depth of washout

D-Exponent and 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)

Open-Ended Pipe Displacement

Pressure Acting Against Tubular

Pressure and Force

Pressure Gradient

Slug Calculation

Specific Gravity (SG)

Total Bit Revolution in Mud Motor

**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

Increase mud weight by adding Calcium Carbonate

Increase mud weight by adding 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

**Hydraulic Formulas**

Bi Nozzle Velocity

Bit Aggressiveness

Bit Hydraulic Horsepower

Bit Hydraulic Horsepower Per Area of Dril Bit (HSI)

Critical Flow Rate

Cross Flow Velocity Under a Drilling Bit

Cutting Carrying Index

Cutting Slip Velocity Method#1

Cutting Slip Velocity Method#2

Effective Viscosity

Hydraulic Horse Power (HPP)

Impact Force of Jet Nozzles on Bottom Hole

Mechanical Specific Energy

Minimum Flow Rate PDC bit

Optimum Flow Rate for basic system

Power Law Constant

Pressure Drop Across Bit

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

Total Flow Area Table

**Well Control Formulas**

Actual gas migration rate in a shut in well

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

Average Fluid Density

Bottle Capacity Required in Accumulator

Brine Weight with Temperature Correction

Calculate Influx Height

Drill Pipe Pressure Schedule (Wait and Weight)

Estimate gas migration rate with an empirical equation

Estimate type of influx

Final Circulating Pressure (FCP)

Formation Fracture Pressure

Formation pressure from kick analysis

Hydrostatic Pressure Gained per Volume Lubricated into A Well

Hydrostatic Pressure Loss Due to Gas Cut Mud

Initial Circulating Pressure (ICP)

Initial Hydrostatic Pressure

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

Mud Weight from API Gravity

New Pressure Loss With New Mud (psi)

New Pump Pressure With New Strokes (psi)

Overbalance Due to Peforming Lubricate and Bleed

Riser Margin

Trip margin

Kick tolerance factor (KTF)

Kick Intensity

Maximum Kick Intensity

Increase in Casing Pressure due to Kick Penetration

Lube Increment

Mud Increment

Time To Penetrate Kick

Bullheading Pressure Schedule from End of Tubing to Top of Perforation (psi per required strokes)

Bullheading Pressure Schedule From Surface to End of Tubing (psi per required strokes)

Bullheading Volume

Maximum End of Tubing Surface Pressure When KWM at End of Tubing

Maximum Final Surface Tubing Pressure when KWM at Perforation

Maximum Initial Surface Pressue

Balance Point of Filled Pipe (Snubbing)

Balance Point of Unfilled Closed-End Pipe (Snubbing)

Effective Area of Snubbing Jacks

Maximum Down Force on Jacks

Snub Force

**Drill String**

Tensile Capacity of Drill String

**Cementing**

Balance Cement Plug Above Retainer

Squeeze Below Retainer and Balance Cement Plug Above Retainer

Balance Cement Plug Inside Casing and Above Cement Retainer

Open Hole Kick off Plug with Stringer in the old casing stump

Open Hole Kick off Plug with Stringer NOT in the old casing stump

Surface Kick off Plug with Stringer in the old casing stump

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