Open AccessAn innovative model for coal seam gas release and flow and its application in simulation of water-jet slotting enhanced gas drainage
Author(s) -
Xuqian Qin,
Honglian Li,
Jiren Tang,
Johnny Qin
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/545/1/012019
Subject(s) - borehole , drainage , petroleum engineering , jet (fluid) , coal mining , coal , geology , flow (mathematics) , decompression , volumetric flow rate , water jet , mechanics , geotechnical engineering , engineering , mechanical engineering , waste management , thermodynamics , ecology , physics , nozzle , biology
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.