SONG Ge FU Xue-hai GE Yan-yan LI Sheng, . Fluid Effect During Coalbed Methane Well Drainage of High Rank Coal Reservoir Under Pressure Control[J]. COAL SCIENCE AND TECHNOLOGY, 2014, (8).
Citation:
SONG Ge FU Xue-hai GE Yan-yan LI Sheng, . Fluid Effect During Coalbed Methane Well Drainage of High Rank Coal Reservoir Under Pressure Control[J]. COAL SCIENCE AND TECHNOLOGY, 2014, (8).
SONG Ge FU Xue-hai GE Yan-yan LI Sheng, . Fluid Effect During Coalbed Methane Well Drainage of High Rank Coal Reservoir Under Pressure Control[J]. COAL SCIENCE AND TECHNOLOGY, 2014, (8).
Citation:
SONG Ge FU Xue-hai GE Yan-yan LI Sheng, . Fluid Effect During Coalbed Methane Well Drainage of High Rank Coal Reservoir Under Pressure Control[J]. COAL SCIENCE AND TECHNOLOGY, 2014, (8).
School of Resources and Geoscience, China University of Mining and Technology Key Laboratory of CBM Resources and Dynamic Accumulation Process, Ministry of Education School of Geology and Mining Engineering, Xinjiang University
In order to obtain the dynamic eqilibrium relationship among pressure, gas and water production in coalbed methane well drainage of high rank coal res ervoir, and reveal coalbed methane drainage effect as well as its mechanism under pressure control, taking X1 well and X2 well in southern Qinshui basin as examples, and based on drainage stages classification of X1 well, fluid effect and desorption laws in the two coalbed methane wells drainage were analyzed under changing press ure, relationships among gas production and casing pressure, dynamic liquid level height, pressure of downhose, depletion pressure were discussed and researched, a nd the variation characteristics of gas production before and after pressure control of X2 well were numerically simulated. The results showed that fluid effect in coalbed methane wells depend on control of casing pressure in the initial stage of drainage, a shutoff pressure and controlling pressure production system could contribute to co albed methane well productivity effectively.
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