煤层气运移产出气水固三相耦合模型

根据达西渗流理论 ,结合Langmuir等温吸附定律和Fick第一定律描述了煤层气由煤基质解吸经扩散进入煤层裂隙系统 ,由裂隙运移至生产井筒产出的气水二相渗流过程 ,又将其和由渗流作用引起的煤体变形场耦合起来 ,形成了煤层气运移产出的气水固三相耦合模型 ,并采用全隐式联立求解方法同时隐式求出了气、水产量和饱和度值 ,实现了模型求解的无条件稳定。在沁水盆地 3 # 煤层气井开采潜能的评价预测中 ,应用该方法分别预测了将该井的动液面置于 3 # 煤底和 15 # 煤底的气、水产量 ,效果良好。

COUPLING MODEL OF THREE PHASE OF GAS WATER SOLID OF COALBED METHANE MIGRATION AND PRODUCTION

Based on the theory of Darcy flow,Langmuir isotherm and Fick's first law, This paper describes the whole process of the desorption and diffusion of coalbed methane from coal matrix to fracture and the two phase flow of gas and water that coalbed methane transports to the well of production from coalbed fracture, and couples it with the deformed field of coal caused by the flowing function of coalbed methane and water to form the coupling model of three phase of gas water solid of coalbed methane migration and production, uses the fully-implicit simultaneous solution method to work out the yield and saturability of gas and water at the same time,and makes the solution of the model positively steady. The method is used to forecast the yield of gas and water of the 3 # coalbed methane well that the equilibrium water level in the well is put to the bottom of 3 # coal and 15 # coal respectively in Qinshui basin. The result is good.