【作者】 邓泽； 康永尚； 刘洪林； 李贵中； 王勃；

【Author】 Deng Ze;Kang Yongshang;Liu Honglin;Li Guizhong;Wang Bo;Faculty of Natural Resources and Information Technology,China University of Petroleum;Langfang Branch of Petrochina Research Institute of Petroleum Exploration & Development;National Key Laboratory for Oil and Gas Resources and prospecting,China University of Petroleum;

【机构】 中国石油大学资源与信息学院； 中石油勘探开发研究院廊坊分院； 中国石油大学油气资源与探测国家重点实验室；

【摘要】 我国煤层气资源丰富,但部分生产井产量低、衰减快。除我国煤层气地质本身构造复杂、储层渗透率低等客观条件外,排采工作制度不合理是影响煤层气产量的一个决定性因素。作为低渗敏感储层,排采过程中煤储层同时受到有效应力效应、基质收缩效应和克林肯伯格效应影响,其渗透率处于动态变化中,与此同时,排采工作制度也需作相应的调整和优化。目前对该动态变化特征仍认识不清,排采工作制度基础理论研究尚有待深入。本文通过引用P&M模型,以沁水煤层气田二叠系山西组3号煤储层为例,预测了开发过程中煤储层渗透率动态变化,指出该区块煤层气井排采中后期有较大的产气前景,并通过敏感性分析,认为杨氏模量越大,基质收缩效果越显著以及含气饱和度越高,越有利于改善煤储层渗透率。更多还原

【Abstract】 China is rich in CBM resources,but so far,most of the tested wells presented low production and rapid decline trend.In addition to these objective factors such as low permeability and complexity of geological structure of CBM reservoir,there is still the most important cause of the exploitation techniques,especially the problem of the depletion work system.As sensitive reservoir with low permeability,its permeability varies dynamically during depletion,restrained by three effects of effective stress,matrix shrinkage and Klinkenberg.But now this vairation is not clear yet,and more basic research need to do for depletion.Using P&M model and parameters form 3# coal seam of Qinshui basin,this paper predicted the permeability vairation,revealing good depletion prospect of this CBM field,and pointed that higher Young’s modulus,more obvious matrix shrinkage and higher gas saturation is favour of permeability improvement through sensitivity analysis.更多还原