煤层气生产井排采制度研究与优化

Research and Optimization of Drainage System of Coalbed Methane Production Wells

国内煤层气勘探开发技术日趋成熟,相关开发单位针对性技术成果交流、借鉴和共享较为普遍,极大地促进了煤层气科学技术的不断优化调整。目前,我国针对煤层气生产井排采技术主要为5大研究机构所引导,虽在排采阶段划分的精细程度和理论深度上有很大差异,但是主要还是围绕“煤层气生产井全生命周期”的井底流压、套管压力、产水量和产气量,这4大关键参数。其中,长期稳定的高产气量为终极目标。在研究国内煤层气排采成果的基础上,根据控制产气量的地质因素和工程因素,提出“六段五控”排采方案,供业内工作者参考。

Domestic coalbed methane exploration and development technology is becoming more and more mature,and the common exchange,learning,and sharing of specific technical achievements among relevant development units foster continuous optimization and adjustment of coalbed methane science and technology.At present,the drainage technology of coalbed methane production wells in China is mainly guided by five major research institutions.While variations in fine degree and theoretical depth exist in the classification of drainage and production stages,they predominantly revolve around the four pivotal parameters of the“whole life cycle of coalbed methane production wells”:bottom-hole flow pressure,casing pressure,water production,and gas production.The ultimate objective is to achieve long-term and stable gas production.Based on studying the results of coalbed methane drainage and production in China,according to the geological and engineering factors controlling gas production,a“six-stage and fivecontrol”drainage and production scheme is put forward for the reference of the industry.