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TECHNICAL PAPERS

A New Approach for Determining In-Situ Rock Strength While Drilling

[+] Author and Article Information
L. L. Hoberock, G. J. Bratcher

School of Mechanical and Aerospace Engineering, Oklahoma State University, 218 Engineering North, Stillwater, OK 74078-5016

J. Energy Resour. Technol 118(4), 249-255 (Dec 01, 1996) (7 pages) doi:10.1115/1.2793870 History: Received September 26, 1995; Revised August 19, 1996; Online November 06, 2007

Abstract

A new method is developed for determining rock strength while drilling with a tri-cone roller bit. The technique employs the well-known “drill-off” test, using commonly measured drilling data, and does not require knowledge of drill bit parameters. The method was evaluated with drill-off test data collected from the Gas Research Institute’s SFE (staged field experiment) well no. 4 and compared with calculated in-situ compressive rock strengths provided by Hareland (1992). The results indicate that the proposed approach produces reasonable results and is easily implemented.

Copyright © 1996 by The American Society of Mechanical Engineers
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