Downhole Measurements of Drill String Forces and Motions

[+] Author and Article Information
F. H. Deily, D. W. Dareing, G. H. Paff, J. E. Ortloff, R. D. Lynn

Esso Production Research Company, Houston, Texas

J. Eng. Ind 90(2), 217-225 (May 01, 1968) (9 pages) doi:10.1115/1.3604617 History: Received June 22, 1967; Online August 25, 2011


A self-contained downhole recording instrument was developed and used to measure and record drilling string forces and motions. The eight signals recorded by pulse-width modulation on magnetic tape were: axial, torsional, and bending loads; axial, angular, and lateral accelerations; and internal (pipe) and external (annular) pressure. The device was used over a two-year period to collect data in fifteen wells under a wide range of drilling conditions. After about nine minutes of cumulative recording time, the tool was retrieved and brought to the surface. Data were converted from the magnetic tape to analog type oscillograph display and, in some cases, were digitized for analysis purposes. Normal variations in measured downhole bit load usually ranged between 25 and 50 percent of the mean value. Maximum bit loads reached over 3.5 times mean loads in some instances. Frequencies of weight, torque and bending traces showed evidences of rock bit tooth action, of cone action, of rotation, and also of pump pulsations. Large annular pressure variations accompanied large load variations.

Copyright © 1968 by ASME
Your Session has timed out. Please sign back in to continue.






Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In