كتاب درلينج مانويال دليل الحفر-Drilling Manual| IADC
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Contributors
B. D. Brandon* and Jerry Cerkovnik**, Eastman Christensen; Earl Koskie, DBS; B. B. Bayoud*, EastmanChristensen; Fred Colston, Smith Diamond; R. I. Clayton*, Security; M. E. Anderson*, Christensen K.
T. Hollister*, Hycalog; Jim Senger*, Security Division Dresser Industries; and Ralph Niemi*, Cliffs
* SPE Member; ** IADC and SPE Member.
Summary
This paper was prepared for presentation at the 1992 IADC/SPE Drilling Conference held in New Orleans,
Louisiana, February 18-21, 1992.
This paper was selected for presentation by an IADC/SPE Program Committee following review of information
contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed
by the Society of Petroleum Engineers or the International Association of Drilling Contractors and are subject to
correction by the author(s). The material, as presented, does not necessarily reflect any position of the IADC or
SPE, their officers, or members. Papers presented at IADC/SPE meetings are subject to publication review by
Editorial Committees of the IADC and SPE. Permission to copy is restricted to an abstract of not more than 300
words. Illustrations may not be copied. The abstract should contain conspicuous acknowledgment of where and by
whom the paper is presented. Write Librarian, SPE, P. O. Box 833836, Richardson, TX 75083-3836 U.S.A., Telex
730989 SPEDAL.
Copyright 1992, IADC/SPE Drilling Conference
Abstract
This paper is one of two describing changes to the IADC Classification and Dull Grading Systems for fixed cutter
bits. Dull grading system revisions, described herein, were implemented to improve utilization and effectiveness of
the dull grading system.
Classification system changes were required as a result of improvements in bit technology and applications, and
are detailed in the companion paper SPE 23940.
Introduction
The IADC Fixed Cutter Work Group this year audited the 1987 Fixed Cutter Dull Grading System and determined
that some minor refinement was necessary. As was the case with introduction of the fixed cutter dull grading
system in 1987, the objective of this revision was to facilitate creation of a "mental picture" of a worn bit's physical
condition through a standardized evaluation of certain bit characteristics?
Because the system provides an industry-wide standard for recording the physical condition of the worn bit for
future reference, the meaning of a dull grade should be subject to as little misinterpretation as possible. Therefore,
committee discussions focused on two specific areas: improving the definition of "usable cutter height" as it relates
to evaluation of PDC cutter wear, and making minor enhancements to the wear characteristic codes
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