# Formulas and Calculations for Drilling, Production and Workover

## Description

The most complete manual of its kind, this handy book gives you all the formulas and calculations you are likely to need in drilling operations. New updated material includes conversion tables into metric. Separate chapters deal with calculations for drilling fluids, pressure control, and engineering. Example calculations are provided throughout.Presented in easy-to-use, step-by-step order, Formulas and Calculations is a quick reference for day-to-day work out on the rig. It also serves as a handy study guide for drilling and well control certification courses. Virtually all the mathematics required out on the drilling rig is here in one convenient source, including formulas for pressure gradient, specific gravity, pump output, annular velocity, buoyancy factor, volume and stroke, slug weight, drill string design, cementing, depth of washout, bulk density of cuttings, and stuck pipe.

## Table of Contents

Preface
Chapter 1: Basic Formulas
Pressure Gradient
Hydrostatic Pressure
Converting Pressure into Mud Weight
Specific Gravity
Equivalent Circulating Density
Maximum Allowable Mud Weight
Pump Output
Annular Velocity
Capacity Formulas
Control Drilling
Buoyancy Factor
Hydrostatic Pressure Decrease When Pulling Pipe Out of the Hole
Loss of Overbalance Due to Falling Mud Level
Formation Temperature
Hydraulic Horsepower
Drill Pipe/Drill Collar Calculations
Pump Pressure/Pump Stroke Relationship
Cost Per Foot
Temperature Conversion Formulas
Chapter 2: Basic Calculations
Volumes and Strokes
Slug Calculations
Accumulator Capacity
Bulk Density of Cuttings
Drill String Design (Limitations)
Ton-Mile Calculations
Cementing Calculations
Weighted Cement Calculations
Calculations for the Number of Sacks of Cement Required
Calculations for the Number of Feet to Be Cemented
Setting a Balanced Cement Plug
Differential Hydrostatic Pressure Between Cement in the Annulus and Mud Inside the Casing
Hydraulicing Casing
Depth of a Washout
Lost Returns – Loss of Overbalance
Stuck Pipe Calculations
Calculations Required for Spotting Pills
Pressure Required to Break Circulation
Chapter 3: Drilling Fluids
Increase Mud Density
Dilution
Mixing Fluids of Different Densities
Oil Based Mud Calculations
Solids Analysis
Solids Fractions
Dilution of Mud System
Displacement – Barrels of Water/Slurry Required
Evaluation of Hydrocylone
Evaluation of Centrifuge
Chapter 4: Pressure Control
Kill Sheets and Related Calculations
Prerecorded Information
Kick Analysis
Pressure Analysis
Stripping/Snubbing Calculations
Subsea Considerations
Workover Operations
Chapter 5: Engineering Calculations
Bit Nozzle Selection – Optimized Hydraulics
Hydraulics Analysis
Critical Annular Velocity and Critical Flow Rate
d Exponent
Cuttings Slip Velocity
Surge and Swab Pressures
Equivalent Circulation Density
Fracture Gradient Determination – Surface Application
Directional Drilling Calculations
Miscellaneous Equations and Calculations
Appendix A
Appendix B
Index