An innovative model for coal seam gas release and flow and its application in simulation of water-jet slotting enhanced gas drainage. Issue 1 (July 2020)

• Record Type: Journal Article
• Authors: Qin, Xuqian; Li, Honglian; Tang, Jiren; Qin, Johnny
• Is Part Of: IOP conference series. Volume 545:Issue 1(2020)
• Publication Date: 2020-07
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/545/1/012019
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: In order to better understand the mechanism of water jet slotting in enhancing gas drainage, based on the Langmuir equation, we constructed an innovative model to simulate the gas release and flow law. The simulation results show that the pressure in the coal seam of the slotting case reduces faster than that without slotting. At 21 day, the gas flowrate from the slotting case is 52% larger than that of without slotting. The gas desorbed from the coal seam not only flows to the borehole but also flows to the rock strata. The decompression and venting area starts near the borehole and gradually extends to the whole area.