ArticleACS omega2025
Establishment and Application of a Theoretical Model for Gas Extraction Considering the Influence of Borehole Cross-Section Instability.
Article in ACS omega, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
To resolve poor gas extraction efficiency and short service life due to borehole instability in deep coal seams, this study established a theoretical gas extraction model incorporating borehole cross-section deformation shapes via combined experimentation and numerical simulation, analyzing the impact mechanisms of instability. The results demonstrate that (1) Under increasing extraction negative pressure (10-55 kPa), the extraction flow and unit pressure drop of five instability models follow quadratic growth, with sudden deformation exhibiting maximal pressure loss (unit pressure drop ≤ 59.9 Pa/m), gradual deformation minimal loss (55% of sudden model), and irregular cross-section intermediate loss (72% of sudden model); (2) a modified negative pressure loss model quantifies the local effects of unstable cross-sections, revealing that the local loss coefficient (ξ) and Reynolds number (
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