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Research on the flow mechanism of coalbed methane
Author(s):
LI Chuanliang
,
PENG Chaoyang
Pages:
9
-
11,19
Year:
2011
Issue:
4
Journal:
Lithologic Reservoirs
Keyword:
coalbed methane
;
cheat
;
matrix
;
adsorption
;
desorption
;
degas
;
diffusion
;
Abstract:
煤层气为自生自储型非常规天然气资源。为了更好地开发煤层气,需要深入研究煤层气的开采机理。煤层气赋存于煤岩层的割理和基质孔隙中,以吸附状态为主,且与地层水共存。煤层气从孔隙壁面上解吸下来之后,才能被开采。开采地层水导致地层压力下降,进而导致煤层气解吸成为自由气,解吸后的煤层气沿割理渗流至井底后被采出地面。煤层气的开采过程包括脱气、解吸和渗流3个阶段。扩散不是煤层气的开采机理。
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