Rig Math

Trouble-Free Drilling

This book is intended to help drilling personnel improve their understanding of the down hole mechanics of drilling. The focus of this book is the physics of stuck pipe.The mechanics of what causes stuck pipe is explained in great detail.Warning signs, preventive measures, and various freeing procedures are also discussed.Some of this material is based on personal observations and experiments and has never been presented before.Most of the information, however, is based on the hundreds of technical papers I researched while writing this book.

The drilling industry has devoted a lot of effort to the problem of stuck pipe in research facilities around the world.The first technical paper on this subject was written in 1937; today, the topic of stuck pipe appears in more than 8,000 technical papers and books.Unfortunately, most of the men and women working on rigs are not even aware that this research exists.This information is of no use if it does not reach the people in the field.The primary goal of this book is to get this information to rig-based engineers and supervisors in an easy-to-understand format.

Table of Contents:

Chapter 1Stuck Pipe and Other Unscheduled Events
Chapter 2Saving Money, The Root of all Evil
Chapter 3Communication and Morale
Chapter 4Problem Solving
Chapter 5Well Planning
Chapter 6Stuck Pipe Mechanisms
Chapter 7Hole Cleaning
Hole Cleaning Efficiency in Vertical Wells
Hole Cleaning Efficiency in Directional Wells
Air and Foam Drilling
Summary
When to Expect Hole Cleaning Problems
Preventive Measures
Warning Signs
Freeing Procedures
Test your understanding of Hole Cleaning
Chapter 8Well Bore Instability
Rock Mechanics Terminology
Stresses Around the Well Bore
Factors Affecting Stability
Types of Failures
Determination of Stresses
Summary
When to Expect Shale Instability Problems
Preventive Measures
Warning Signs
Freeing Procedures
Test your understanding of Wellbore Instability
Chapter 9Differential Sticking
The Mechanisms of Differential Sticking
Factors Influencing Differential Sticking
Summary
When to Expect Differential Sticking
Preventive Measures
Warning Signs
Freeing Procedures
Test your knowledge of Differential Sticking
Chapter 10Well Bore Geometry
Doglegs
Keyseats
Stiff Assembly
Micro-Doglegs
Ledges
Squeezing Formations
Under-gauge Hole
Warning Signs, Prevention, and freeing procedures
Chapter 11Drilling Trends and Recorders
Trends
Mechanical vs. Computerized Charts
Trend Analysis and Pattern Recognition
Chapter 12Problems Associated with Stuck Pipe
Chapter 13Tripping Practices
Conclusion
Appendix AHole Cleaning Charts (for wells with full pipe rotation)
Appendix BEquations
Appendix CVolume of fluid in a horizontal tank
Appendix DConversion Factors
Table of Figures
Index
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Copyright© 2011 Drilbert Engineering