Previous research in stability of drillstrings was based on the assumption of constant material specific force, i.e., a bit force that is proportional to the area of cut. Moreover, earlier work used a simplified bit model that consisted of planar radial blades. In this paper, correlation between the material specific force and area of cut is obtained for Sierra White granite and Berea sandstone from test data developed at Sandia National Laboratories in Albuquerque, NM. These correlations, together with an improved bit model in which cylindrical cutters are arrayed in an overlapping pattern over a flat surface, are used to obtain the stability equations. Laboratory testing shows good correlation between measured bit vibrations and relative instability as predicted by the stability equations. These results are useful in predicting the appropriate operating conditions for stable drilling and serve as a basis for future development of more accurate models of PDC bits.
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e-mail: melsayed@louisiana.edu
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June 2001
Technical Papers
Drillstring Stability Based on Variable Material Specific Force and Using a Sharp Three-Insert Polycrystalline Diamond Compact (PDC) Coring Bit
M. A. Elsayed, Mem. ASME,
e-mail: melsayed@louisiana.edu
M. A. Elsayed, Mem. ASME
Mechanical Engineering Department, University of Louisiana at Lafayette, Lafayette, LA 70504
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L. F. Washington, Mem. ASME
e-mail: lfw915@louisiana.edu
L. F. Washington, Mem. ASME
Mechanical Engineering Department, University of Louisiana at Lafayette, Lafayette, LA 70504
Search for other works by this author on:
M. A. Elsayed, Mem. ASME
Mechanical Engineering Department, University of Louisiana at Lafayette, Lafayette, LA 70504
e-mail: melsayed@louisiana.edu
L. F. Washington, Mem. ASME
Mechanical Engineering Department, University of Louisiana at Lafayette, Lafayette, LA 70504
e-mail: lfw915@louisiana.edu
Contributed by the Petroleum Division for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received by the Petroleum Division, February 26, 1999; revised manuscript received November 6, 2000. Associate Editor: A. Wojtanowicz.
J. Energy Resour. Technol. Jun 2001, 123(2): 138-143 (6 pages)
Published Online: November 6, 2000
Article history
Received:
February 26, 1999
Revised:
November 6, 2000
Citation
Elsayed, M. A., and Washington, L. F. (November 6, 2000). "Drillstring Stability Based on Variable Material Specific Force and Using a Sharp Three-Insert Polycrystalline Diamond Compact (PDC) Coring Bit ." ASME. J. Energy Resour. Technol. June 2001; 123(2): 138–143. https://doi.org/10.1115/1.1367857
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