煤层气储层三维渗透率变化规律试验研究.PDFVIP

第41 卷 第4 期 煤田地质与勘探 Vol. 41 No.4 2013 年8 月 COAL GEOLOGY EXPLORATION Aug. 2013 文章编号: 1001-1986(2013)04-0026-05 煤层气储层三维渗透率变化规律实验研究 裴柏林 ( 中国石油大学(北京)气体能源开发与利用教育部工程研究中心，北京 102249) : 煤层气开发过程中，储层的渗透性是制约煤层气开发的重要因素之一。采用煤心室内流动 实验的方法，对不同围压、不同流压下的煤心进行渗透率测试，得出其渗透率变化曲线；进而， 对实验数据进行回归发现，煤心渗透率与围压之间存在幂指数关系，而模型参数与注入压差之间 存在指数关系。分析三维渗透率流动实验过程得出，煤心渗透率变化为非可逆过程，煤心的左右 方向对压力变化更为敏感；同时，在低压区，渗透率变化较快，而高压区变化平缓。因此，在煤 层气开发过程中，要尤其注重低压区压力变化对渗透率的影响。 ：煤层气；三维渗透率；室内流动实验；幂指数；敏感性 ：P618.13 ：A DOI: 10.3969/j.issn.1001-1986.2013.04.007 Experimental research on variation pattern of 3D permeability in coalbed methane reservoir PEI Bolin (Gas Energy Development and Use Engineering Centre of the Ministry of Education, China University of Petroleum, Beijing 102249, China) Abstract: During coalbed methane development, the permeability of reservoir is one of the important restricting factors. The paper, adopting lab flowing test of coal cores, has measured the permeability of coal cores under dif- ferent confining pressure and different flowing pressure, obtained the variation curves of permeability. Furthermore from regression of test data, it was found that there was power exponent relation between the permeability and the ambient pressure in coal cores, and there existed exponential relation between model parameters and injection pressure difference. The analysis of flowing experiment process of 3D permeability indicated that the permeability variation of coal cores is a non-reversible process, the left direction and the right direction of coal cores are more sensible to pressure change. Moreove