Experimental Study on Force of PDC Cutter Breaking Rock

Abstract:

Because the anisotropy of shale formation should result in that wellbore deviations is unpredictable, the bit-rock interaction should be fully lucubrated in order to eliminate this problem. The impact of shale rock anisotropy and the cutting velocity on the load of PDC cutter wasn’t considered by the existing cutter-rock interaction models. On the basis of experiments of cutting shale with PDC cutter, using the stress tensor analysis theory, the relationship between the shale rock anisotropy and the cutter’s force is proposed in this paper. A new cutter-rock interaction model was established, and then a new bit-rock interaction model was set up. That applying these models to the ROP prediction of directional PDC bit can improve forecast accuracy is found.

• Periodical: Applied Mechanics and Materials (Volumes 602-605)
• Pages: 361-364
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.602-605.361
• Online since: August 2014
• Authors: Jia Jun Wang*, De Yong Zou
• Keywords: Cutting Velocity, Interaction Model, PDC Bits, Shale Formation

References

[1] Menand S, Sellami H, Simon C, et al. How bit profile and gauges affect well trajectory [J]. SPE drilling & completion, 2003, 18(01): 22-32.

DOI: 10.2118/82412-pa

[2] Menand S, Sellami H, Simon C. PDC Bit Classification According to Steer ability [J]. SPE Drilling & Completion, 2004, 19(01): 5-12.

DOI: 10.2118/87837-pa

[3] Fairhurst C. Some Possibilities and Limitations of Rotary Drilling in Hard Rocks [J]. Trans, (1955).

[4] Gray K E, Armstrong F, Gatlin C. Two-dimensional study of rock breakage in drag-bit drilling at atmospheric pressure[J]. Journal of Petroleum Technology, 1962, 14(01): 93-98.

DOI: 10.2118/164-pa

[5] Roxborough F F, Pedroncelli E J. Practical evaluation of some coal-cutting theories using a continuous miner [J]. Mining Engineer, 1982, 142: 145-56.

[6] Dagrain F, Tshibangu J P. Use of the D3 model for the estimation of forces acting on a cutter in rock cutting and drilling[C]/SPE/ISRM Rock Mechanics Conference. Society of Petroleum Engineers, (2002).

DOI: 10.2118/78242-ms

[7] Pelfrene G, Sellami H, Gerbaud L. Mitigating Stick-Slip In Deep Drilling Based On Optimization Of PDC Bit Design[C]/SPE/IADC Drilling Conference and Exhibition Proceedings. (2011).

DOI: 10.2118/139839-ms

[8] Hartley R R, Behringer R P. Logarithmic rate dependence of force networks in sheared granular materials [J]. Nature, 2003, 421(6926): 928-931.

DOI: 10.1038/nature01394

[9] Gerbaud L, Menand S, Sellami H. PDC bits: all comes from the cutter rock interaction[C]/IADC/SPE Drilling Conference. (2006).

DOI: 10.2118/98988-ms