C Coalbed methane reservoir model under mining conditions and its application
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摘要: 煤矿区煤层气开发受煤矿采动影响，为实现煤矿采动条件下煤层气井产能数值模拟，抽象概化了采动条件下煤层气开发的地质模型，构建了采动条件下煤层气储层的数学模型，并通过对CBM-SIM软件二次开发，实现了采动条件下煤层气储层的数值模拟。在建模和数值解算软件开发中，基于采动离层量变化曲线公式构建了采动条件下储层渗透率变化曲线公式，利用采动井水位变化规律构建了储层漏失水量变化公式，利用时间卡机制解决了煤储层渗透率及漏失水量的动态求解和循环迭代过程中作为系数和边界条件的调用赋值，实现了渗透率随采动影响的动态变化、储层水漏失降压和储层产气的耦合解算。应用开发的软件对淮南矿区某矿采动条件下煤层气抽采井生产数据进行历史拟合和产量模拟应用，预测煤层气产量曲线与实际生产曲线基本一致，判定系数达到0.92。Abstract: In order to realize the numerical simulation of coalbed methane reservoir under mining conditions, the geological model of coalbed methane development under mining conditions is generalized, the mathematical model of coalbed methane reservoir under mining condition is constructed, through the secondary exploration of CBM-SIM software, the numerical simulation of coalbed methane reservoir under mining conditions is realized. In the process, the formula of reservoir permeability change curve under mining condition is established based on the formula of variation curve of strata separation, the variation formula of water loss in reservoir is established based on the variation law of water level. By the time card mechanism, the dynamic solution of permeability and leakage water quantity of coal reservoir is made, and the call assignment of coefficients and boundary conditions in the iteration process is solved. The coupling calculation of the dynamic change of permeability with mining influence, the reservoir water leakage and reservoir gas production is realized. By using the software development, the production data of coalbed methane extraction well under mining conditions in Huainan mining area are simulated by historical and yield prediction. The production curve is consistent in shape, and the coefficient of judgment is 0.92. Good simulation results have been achieved.
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Keywords:
- mining condition /
- coalbed methane /
- reservoir /
- numerical simulation
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