Study on guided slot-oriented hydraulic fracturing and enhanced permeability application technology in Pingdingshan coal mine

To address the issue of low permeability in the coal seam of Pingdingshan coal mine, this study proposes a directional hydraulic fracturing technique enhanced by a preset guide groove, aimed at improving coal seam extraction efficiency. The COMSOL Multiphysics simulation software is utilized to develop a coupling model that integrates coal rock stress, damage, and permeability during hydraulic fracturing. The study examines the changes in the elastic damage modulus and effective extraction radius under the influence of the guide groove, with field tests conducted on the 24130 working face. Results from both numerical simulations and field tests reveal that the horizontal principal stress exceeds the vertical principal stress under the influence of the guide channel, leading to horizontal tensile fractures in the rock stratum. Post-fracturing, the average gas concentration in the extraction borehole reached 42.4%, with an average pure gas extraction rate of 0.0098 m3/min, and an effective extraction radius of 3.6 m, aligning well with the simulation results.

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Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025)