煤层气井排采过程中储层压力传播规律研究

 煤储层压力是影响煤层气产出的关键因素,查明煤储层压力在煤层气井排采过程中的传播规律对于煤层气的开发具有重要的指导意义。为此,本文在分析煤层气井排采机理的基础上,重点研究了煤储层压力在不同的煤储层边界条件和排采制度下的传播规律。研究表明：在不同的煤储层边界条件和排采制度下,储层压力传播形成的压降曲线各异;煤储层压力的传播过程可分为两个阶段,即压力传播到储层边界之前为第一阶段,传到储层边界之后为第二阶段。

Research on pressure transmission regularity in the process of draining coalbed methane

Reservoir pressure is a major factor influencing gas output, and it is beneficial to study its spread regularity in the process of coalbed methane (CBM) drainage. Based on the CBM drainage mechanism, this paper analyses the spread regularity under the different boundary conditions and drainage technologies. The results show that for different boundary conditions and drainage technologies, the pressure-drop curves are different, and there are two stages in the process of pressure transmission, while the diverse stages are decide by the time when pressure transmits to the reservoir boundary.