Optimization of Slips Structure for Preventing Upward Sliding of Drill Pipe Based on Experimental and Numerical Simulation

doi:10.11885/j.issn.1674-5086.2019.10.15.01

Abstract

Abstract: There are few researches on prevention upward sliding of drill pipe, which is caused by high casing pressure after well shut-in, mature equipment to solve the problem have remained elusive. This problem can be solved effectively by the drilling pipe anti-jacking device designed in this paper. The slips used in the device bear a large clamping force during the working process, and the tooth tip is prone to wear, which directly affects the anchoring energy of the anti-jacking device. Through laboratory test and numerical simulation, this paper analyzed the working process of the slips, and analyzed the parameters such as the tooth rake angle α, tooth top round chamfer R and slips tooth tip distance d, which affect the stress distribution on the drill pipe, meanwhile, we obtained the Mises stress distribution and contact stress distribution of the drillpipe, the change law of axial displacement with each parameter. The results indicated that the tooth rake angle α=60° and tooth top round chamfer R=0.3 mm is the most reasonable slips tooth type, and this conclusion was well verified by laboratory experiments. The research results provide a theoretical basis for the optimal design of the slips structure of the anti-jacking device.

Key words: slips structure, anti-jacking device, tooth rake angle, tooth top round chamfer, tip distance

CLC Number:

TE92

DONG Xuecheng, XIONG Kerui, WANG Guorong, WANG Pengcheng, KUANG Shengping. Optimization of Slips Structure for Preventing Upward Sliding of Drill Pipe Based on Experimental and Numerical Simulation[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(1): 167-175.

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