A Study on the Mechanism and Heat Generation Law of PDC Wear Tooth Cutting

doi:10.11885/j.issn.1674-5086.2020.06.04.03

Abstract

Abstract: To explore the cutting process of deep drilling PDC bit cutting teeth in the wear state, the single tooth cutting experiment is carried out by selecting PDC cutting teeth with different wear degrees on the deep drilling PDC bit. The stress state, temperature change law and crack propagation process are analyzed by stress test system, high speed camera and thermal infrared imager. The results show that the cutting force, temperature change and large volume cuttings are more obvious than the non-wear teeth, which will lead to the outburst of drill bit vibration and the sharp acceleration of wear, seriously affecting its service life. On the other hand, when cutting granite, the problem of cutting force increase and heating up is more prominent, but volume breakage is more likely to happen and produce larger block cuttings. The research results will help to re-understand the rock breaking and temperature variation law of real bottom wear teeth, and provide important reference for bit design and downhole life evaluation.

Key words: wear teeth, single tooth cutting, rock breaking process, temperature change, working performance

CLC Number:

TE921

YANG Yingxin, XIE Song, CAI Can, CAO Yulei, LI Bangrun. A Study on the Mechanism and Heat Generation Law of PDC Wear Tooth Cutting[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(1): 180-188.

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