论文部分内容阅读
考虑煤层气解吸、扩散、渗流规律,建立了煤储层基质孔隙和裂隙双重介质的气、水两相排采数学模型,对刘家区复杂地质条件下的水平井排采煤层气进行了数值模拟研究,并结合经济效益约束方程,研究了储层中垂向井位对水平井产能、经济效益的影响,从水平井长度、井筒直径方面对水平井结构进行了优化设计,最后确定了优化后水平井的排采强度。结果表明:模拟结果与现场监测生产曲线吻合较好,表明所建数学模型和地质模型是可靠的;水平井的产气量和经济效益与储层的渗透率密切相关,渗透率最大的层位产能、效益最好;存在一个产能最优水平段长度、最优井筒直径。
Considering the law of desorption, diffusion and seepage of coalbed methane, a mathematic model of gas-water two-phase extraction of dual porosity and fissure medium in coal reservoir was established. The coalbed methane discharged from horizontal well under complex geological conditions in Liujia District Numerical simulation and the economic benefit constraint equation, the influence of vertical well position on productivity and economic benefits of horizontal well is studied. The horizontal well structure is optimally designed from horizontal well length and wellbore diameter. Finally, the optimization Rear horizontal well discharge intensity. The results show that the simulation results are in good agreement with the on-site monitoring production curve, indicating that the mathematical model and the geological model are reliable. The gas production and economic benefits of horizontal wells are closely related to the permeability of reservoirs. The maximum permeability , The best benefit; there is a production capacity of the best horizontal section length, the optimal wellbore diameter.