摘要
利用渗流理论,通过对陕西韩城WL1井组、山西晋城潘河示范区的排采数据以及煤层气排采动态资料的分析,将套压参数划分为3个类型。套压小于0.3 MPa时,地层处在泄压阶段,产气不稳定,是排采的初级阶段;套压为0.3～1.1 MPa时,排采曲线基本符合达西定律,为线性曲线;当套压大于1.1 MPa时,曲线反映的是二次函数,属于紊流状态,产气不稳定。实践表明,套压参数对产气量的影响很大,曲线类型的划分对煤层气的排采工作具有一定的指导意义。指出:线性曲线,基本符合达西定律。
The Draining and collection data River demonstration area, Shanxi and dynamic of WL1 wells in Shaanxi Hancheng Group, Pan data are analyzed based on percolation theory in the paper, as a result of partitioning case pressure into three types. When case pressure is les than 0.3Mpa, the strata are at release pressure state, gas production is unstable at the elementa- ry period. When case pressure is 0.3-1.1MPa, the production curve satisfies basically the Dacy＇s law and is linear curve. When case pressure is bigger than 1.1Mpa, the curve reflects t quadratic function with turbulence state and gas production is unstable. The real data show that case pressure has a big influence on gas production, and the partition of curve type has a signifi- cant to guiding the draining and collection of coal bed methane （CBM）. Case pressure should be controlled to make draining and collecting curve into linear curve and satisfying Darcy＇s law.
出处
《中国煤炭》
北大核心
2009年第12期102-104,共3页
China Coal
关键词
煤层气排采
渗流理论
套压
产气量
draining and collection for CBM
percolation theory
case pressure
production volume
