Principle and technology of in-situ magnetically controlled multidirectional pressure-preserved coring in the coal mine

Authors

LIU Guikang, State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaFollow
LI Cong, State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaFollow
YOU Zhenxi, School of Mechanical Engineering, Sichuan University, Chengdu 610065, China
HU Yunqi, School of Mechanical Engineering, Sichuan University, Chengdu 610065, China
HUANG Wei, School of Mechanical Engineering, Sichuan University, Chengdu 610065, China
WANG Ruize, CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China
XU Meng, School of Mechanical Engineering, Sichuan University, Chengdu 610065, China

Abstract

Obtaining the in-situ physical and mechanical parameters of coal-rock mass is the primary task for the development of deep coal resource. Accurate measurement of the in-situ parameters of gas is the basic guarantee to realize the safe mining of coal. In view of the technical challenges of inaccurate measurement of in-situ gas parameters in coal mine, the idea of multi-directional pressure-preserved coring technology based on magnetic force control was proposed with consideration to the technical characteristics of coring in underground coal mines. Specifically, a self-triggered magnetically controlled pressure-preserved controller was designed based on the characteristics of the composite magnetic field. The triggering and sealing structure for coring was optimized. The key pressure-preserved components realized the non-contact self-triggering and self-sealing by magnetic force control, thus improving the fault tolerance of the pressure-preserved trigger. Besides, a test platform functioning for multi-directional pressure-preserved coring was developed independently. With the self-developed test platform, it was verified that the pressure-preserved controller had a good triggering and self-sealing ability at different coring angles. In addition, a magnetically controlled pressure-preserved module was integrated to form a multidirectional pressure-preserved coring device. Moreover, laboratory tests were conducted to verify that the device could realize the pressure-preserved coring in multiple directions, and the pressure-preserved capacity could reach 6 MPa, which meets the condition of pressure-preserved coring in coal mines. The research results provide technical support for the multidirectional pressure-preserved coring in deep coal mines and provide a new idea for the design of pressure-preserved control structure.

Keywords

in-situ gas, multidirectional pressure-preserved coring, magnetic force control, self-triggering, self-sealing

DOI

10.12363/issn.1001-1986.22.12.0935

Recommended Citation

LIU Guikang, LI Cong, YOU Zhenxi, et al. (2023) "Principle and technology of in-situ magnetically controlled multidirectional pressure-preserved coring in the coal mine," Coal Geology & Exploration: Vol. 51: Iss. 8, Article 3.
DOI: 10.12363/issn.1001-1986.22.12.0935
Available at: https://cge.researchcommons.org/journal/vol51/iss8/3

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