Freezing temperature field characteristics of multi-loop pipers under different working conditions at the interface of deep thick sand and clay

Authors

YANG Qing, School of Civil and Architecture Engineering, Chuzhou University, Chuzhou 239000, China; Engineering Research Center of the Ministry of Education on Underground Mining Engineering of Anhui University of Technology, Huainan 232001, China
RONG Chuanxin, School of Civil Engi-neering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; Engineering Research Center of the Ministry of Education on Underground Mining Engineering of Anhui University of Technology, Huainan 232001, China
LI Mingjing, School of Civil Engi-neering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
YANG Guobing, Anhui Chuzhou Technician College, Chuzhou 239000, China

Abstract

When drilling in a complex heterogeneous formation, due to the limitation of bit crown shape, the cutters of each part of the bit are subjected to non-uniform force, and the cutters at the local location are subjected to large impact load, which lead to the occurrence of bit vortex. In order to solve the problem, a “multi-level force balance” cutter circumferential arrangement scheme is proposed. By establishing the rock breaking finite element simulation model of the bit, the mechanical characteristics of the cutter and the bit under three circumferential cutter distribution modes(clockwise, counterclockwise and “multi-level force balance”) are analyzed. Simulation results show that comparing with the clockwise and counterclockwise circumferential cutter arrangement modes, the load distribution of each blade is more uniform under the “multi-level force balance” cutter arrangement mode, the ability and aggression of the bit are improved, and the rock-breaking efficiency of the bit is improved by more than 28%, for the clockwise circumferential cutter arrangement mode, the lateral force of the bit is the highest and the stability of the bit is the worst; while for the counterclockwise circumferential cutter arrangement mode, the weight on bit is relatively higher, and the bit is less aggressive, the rock-breaking efficiency is the lowest. The above research results can provide a theoretical basis for the design of circumferential cutter distribution of the PDC bit. It is suggested that, in the future, the research on the cutter load distribution along the radial of the bit under the “multi-level force balance” cutter circumferential arrangement scheme should be strengthened, so as to guide the optimal design of the anti-vortex stable PDC bit.

Keywords

cutter arrangement pattern, multi-level force balance, numerical simulation, rock-breaking load, rock-breaking efficiency

DOI

10.3969/j.issn.1001-1986.2020.06.030

Recommended Citation

YANG Qing, RONG Chuanxin, LI Mingjing, et al. (2020) "Freezing temperature field characteristics of multi-loop pipers under different working conditions at the interface of deep thick sand and clay," Coal Geology & Exploration: Vol. 48: Iss. 6, Article 31.
DOI: 10.3969/j.issn.1001-1986.2020.06.030
Available at: https://cge.researchcommons.org/journal/vol48/iss6/31

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