煤层气垂直井排采过程中压降传播规律研究
Pressure Drop Propagation Law in Vertical CBM Well Drainage and Mining Process
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摘要: 在分析煤层气垂直井排采过程中井底压力变化特征的基础上，将煤层气井排采过程分为降压排采阶段和稳压排采阶段。重点研究了不同的储层边界条件下煤层气井在2种排采阶段中煤储层压力曲线传播规律，根据压降曲线变化特征将开放性边界条件下压降曲线划分为Ⅱ、V、Λ和O 4种类型；将封闭性边界条件下压降曲线划分为Ⅱ、V1、V2和V3 4种类型。排采过程中压降曲线受边界条件、储层物性和排采时间等因素的影响而形态各异，其变化规律可由以上几种类型曲线的选择性组合来表述。Abstract: Based on the analysis on variation characteristics of bottom hole pressure of coalbed gas wells during drainage and extraction phases, the whole drainage and extraction process of coalbed gas well is divided into pressure drop phase and stable pressure stage, the propagation laws of the pressure curve of coal reservoir in the two stages of drainage and mining under different reservoir boundary conditions are emphatically studied. The production curve is divided into four types:II, V, Λ and O according to the characteristics of pressure drop curves under open boundary condition, and four types:II, V1,V2 and V3 under closed boundary condition. The pressure drop curve in the process of drainage and mining varies in shape due to factors such as boundary conditions, reservoir property and drainage and mining time.
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