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- Title
Analysis of Collapse Mechanism and Anti-collapse Support of Borehole in Deep Tectonic Coal.
- Authors
Jingtao Li; Dingqi Li; Shuren Wang; Yubo Chen
- Abstract
To solve the collapse problem of borehole in tectonic coal, based on the actual collapse and plugging characteristics of the borehole, the numerical model of anti-collapse and support of borehole with borehole-sieve tube was built by using FLAC3D. The collapse mechanism of borehole was revealed, the support scheme of full-length support with setting sieve tube and sealing device from the drill pipe inside was proposed. Combining with field tests of collapse prevention and support of boreholes, the deformation and support characteristics of boreholes in tectonic coal were revealed. Results show that the stress is redistributed after the borehole being completed, and the stress concentration occurs on both sides of the borehole due to the tectonic stress. The stress variation range of the coal around the borehole supported by the screen pipe is smaller. The vertical displacement around the borehole is reduced by 38% and the plastic damage area of that is reduced by 34%. The full-length support and deep borehole sealing technology can significantly improve gas extraction concentration and pre-pumping time. The conclusions obtained in this study can provide the reference to the collapse prevention of the borehole in the tectonic coal.
- Subjects
BOREHOLES; COAL; SEALING devices; SEALING (Technology); GAS well drilling; DRILL pipe; CHEMICAL preconcentration
- Publication
Journal of Engineering Science & Technology Review, 2022, Vol 15, Issue 6, p125
- ISSN
1791-2377
- Publication type
Article
- DOI
10.25103/jestr.156.15