23煤层气开采井间压力干扰特征研究邵长金.doc

煤层气开采井间压力干扰特征研究邵长金， 1964年生，教授，博士；2005年毕业于中国石油大学，现在中国石油大学任教，主要从事油气藏渗流与提高采收率研究工作。地址：（102249）北京市昌平区府学路18号。电话：（010E-mail:physics@cup.edu.cn 邵长金1李相方1 徐兵祥1 赵明1 胡爱梅2 陈东2 张冬玲3 中国石油大学 北京102249；2.中联煤层气国家工程研究中心有限责任公司 北京100095；3.中石油煤层气有限责任公司 北京100028） 摘要： 正确认识井间压力传递规律，确定井间干扰发生的时间，是获取最优井网密度的关键。以H矿区3#层为例对象，用数值模拟方法研究了多井生产时井间压力干扰问题，结果表明： 不压裂时，井距越小，压力干扰产生的压力下降速度越大；压裂时，压力下降不平滑并出现了两个区段，压裂裂缝中的压降速度是介质中的100倍； X方向的压裂不仅对X方向介质中压力干扰的时间和压降速度有影响，也对Y方向以及对角连线方向有显著作用。 关键词： 数值模拟；压力干扰；压裂；割理 Characteristics of pressure interference among coalbed methane wells SHAO Changjin1 LI Xiangfang1 XU Bingxiang1 HU xiaohu1 HU Aimei2 CHEN Dong2 ZHANG Dongling3 (1. China University of Petroleum, Beijing 102249, China; 2. China United Coalbed Methane State Engineering Research Center Corp., Ltd. Beijing 100095, China; 3. Petrochina Coalbed Methane Company Limited,Beijing 100013,China ) Abstract: It is the key issue for well pattern optimization to correctly know the propagation law of the pressure drop among coalbed methane wells and identify the starting time of pressure drops. This is done by numerical modeling method with an example of 3# layer in H coalbed methane producing area, which has multiple wells working simultaneously . The simulated results show that: The smaller the well spacing, the bigger the pressure drop velocity caused by pressure interference among adjacent wells under un-fractured condition. If the wells are fractured, there will exist two regions having different pressure drop velocities corresponding to the part of being fractured and the part of un-fractured matrix. The pressure drop velocity of the part being fractured maybe is 100 times of that in the un-fractured matrix part. Meanwhile, the well fracturing in face cleats has not only effects on the starting time of pressure drops and pressure drop velocity in face cleats direction ,but also on that in butt cleats direction. From this point, it can be concluded that it is necessary to consider the effects of fracturing