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IADC Contact Information:

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All Rights Reserved by International Association of Drilling Contractors

The IADC Drilling Manual Published by Technical Toolboxes, Inc.

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Acknowledgements

The 1991 Drilling Technology Committee of IADC, chaired by W.M. “Sonny” Rogers,

authorized the preparation of the eleventh edition of this manual. This edition is the

eBook version of the entire eleventh edition. This version is fully searchable and has new

color graphics and photographs.

Jay Norton, Chairman of the Drilling Manual Subcommittee and many of the Industry’s

most knowledgeable people have reviewed, rewritten, and added chapters for the benefit

of the user. Their time, effort, and dedication, in spite of difficult economic times for the

industry, is greatly appreciated.

The Association would again like to express its appreciation to the many contributors to

previous editions. Without their early interest, the manual would not have evolved to its

present status.

The following people served on the 1991-92 Rewrite Subcommittee and as Chairman for

the Chapter rewrite task groups:

John Altermann Reading and Bates

Robert Bennett Millpark Drilling Fluids

Bill Bingham MH Koomey

Sonny Cain SWACO

Jerry Cerkovnik Hughes Christiansen

Otis Danielson Consultant

John Gieck Baker Hughes

Bill Halliday Millpard Drilling Fluids

Bruce Harwell DI Industries

Larry Jones Consultant

Jay Norton Norton Drilling

Paul O’Connor O’Connor and Young Drilling

Chuck Rayburn Grasso Oil Services

Chris Reinsvold Hughes Christiansen

W.M. “Sonny” Rogers Tuboscope

Jim Senger Security Dresser

Jim Sikes Sonat Offshore

Jack Smith Baker Hughes

Tom Smith Tom Smith Consulting

Mickey Thomas Halliburton Services

Jim West PETEX

Wayne Wilson Tuboscope

Special Acknowledgement for the eBook version

Special thanks are due to Hal Kendall of Noble Drilling Corporation for providing many of

the enhanced graphics and illustrations used in this electronic version of the 11th Edition

of the "IADC Drilling Manual".

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International Association of Drilling Contractors 1

Table of Contents

Table of Contents - IADC Drilling Manual

Chapter A - Bit Classification and Grading..................A-1

A-1 First Revision To The IADC Fixed Cutter Dull Grading System .......................................................... A-7

Contributors ...................................................................................................................................... A-7

Summary ........................................................................................................................................... A-7

Abstract ............................................................................................................................................ A-7

Introduction .......................................................................................................................................

...