Study on the pressure relief effect in gob‐side coal body during mining an inclined longwall panel

Zhou, Ruoqian; Wang, Hongtu; Shu, Cai; Chu, Tao

doi:10.1002/ese3.923

Cited by 1 publication

(1 citation statement)

References 33 publications

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“…With the increase in coal mining intensity and the rapid growth of mining depth, the problems of gas outbursts are becoming more serious [1][2][3]. Terefore, the predraining boreholes are required to prevent gas outbursts [4][5][6]. Directional drilling technology (DDT) has the advantages of a controllable track, a long efective extraction distance, multiple branch holes, and a large concentrated extraction area, as well as the advantages of a lower drilling construction cost and high-efciency gas extraction [7].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

Shu

Zhao

Mei

et al. 2023

Mathematical Problems in Engineering

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With the wide application of directional drilling technology in coal mine predraining boreholes, the failure problem of the tool joint of the directional drill pipe has become one of the main factors restricting the drilling efficiency. The main reason for the failure problem of the tool joint of the directional drill pipe is the stress concentration. The stress test rig for the tool joint of the directional drill pipe is designed based on the resistance strain measurement method, and the stress of the tool joint of the directional drill pipe is tested. The tool joint’s 3D finite element model was established based on nonlinear contact theory. The experiment verified the accuracy of this model. The stress distribution of the tool joint of the directional drill pipe was obtained. The research shows that the stress of the tool joint of the directional drill pipe is concentrated at the root between the third and the fourth turn of the engaged thread. The work presented in this study is a reliable guide to the design and field use of the tool joint of the directional drill pipe.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

Shu

Zhao

Mei

et al. 2023

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

Study on the pressure relief effect in gob‐side coal body during mining an inclined longwall panel

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 1 publication

References 33 publications

Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

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