Rock Breaking Process and Efficiency Analysis of Conical Cutting Teeth under Rotary and Torsional Impact

HU Sicheng; GUAN Zhichuan; LU Baoping; LIANG Deyang; HU Huaigang; YAN Yan; TAO Xinghua

doi:10.11911/syztjs.2021035

Volume 49 Issue 3

May 2021

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Petroleum Drilling Techniques > 2021 > 49(3): 87-93. > DOI: 10.11911/syztjs.2021035

HU Sicheng, GUAN Zhichuan, LU Baoping, LIANG Deyang, HU Huaigang, YAN Yan, TAO Xinghua. Rock Breaking Process and Efficiency Analysis of Conical Cutting Teeth under Rotary and Torsional Impact[J]. Petroleum Drilling Techniques, 2021, 49(3): 87-93. DOI: 10.11911/syztjs.2021035

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Rock Breaking Process and Efficiency Analysis of Conical Cutting Teeth under Rotary and Torsional Impact

1.
School of Petroleum Engineering, China University of Petroleum(East China), Qingdao, Shandong, 266580, China
2.
Shandong Ultra-Deep Drilling Process Control Technology Research & Development Center, Qingdao, Shandong, 266580, China
3.
Sinopec Research Institute of Petroleum Engineering, Beijing, 102206, China

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Received Date: July 22, 2020
Revised Date: March 17, 2021
Available Online: March 22, 2021

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Abstract

Abstract

In order to gain a better understanding of the rock-breaking process and efficiency of conical cutting teeth under rotary and torsional impact loads, numerical simulation and experimental data verification were conducted to study the rock’s internal stress changes, damage characteristics, breaking volume, depth and rock breaking specific work by the two methods at different impact amplitudes and frequencies. The numerical simulation and analysis results showed that both the rock-breaking processes of conical cutters under rotary impact and torsional impact could be divided into four stages: cutter intruding into rock, damage through crack initiation, damage through crack propagation, and rock cuttings avalanche. The tensile stress is the main reason for the cracks from the inside to the surface of rock, and the internal damage and micro-cracks appear mainly due to compressive shear stress. With the increase of impact amplitude and impact frequency, the broken volume of rock will increase in both the two ways. When the impact amplitude and frequency are increased to certain values, the increase of rock-breaking volume tends to be mild, and the maximum rock-breaking volume under rotary impact is higher than that under torsional impact. Among the three rock breaking methods - conventional cutting, rotary impact and torsional impact - the rock breaking specific work of conventional cutting is the greatest, and the rock breaking specific work under the conditions of different impact amplitudes and frequency of torsional impact is generally lower than that of rotary impact.
- conical cutter,
- rotary impact,
- torsional impact,
- rock breaking process,
- rock breaking efficiency,
- rock breaking specific work

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