偏心电位法测定煤层气井裂缝参数的尝试和探讨  

Trial and discussion on measuring fracture parameters of coalbed methane wells by eccentric potential method

作　　者：唐建信[1] 张鑫[2] 宋鸿璐 陈韵 Tang Jianxin;Zhang Xin;Song Honglu;Chen Yun(Sinopec East China Oil&Gas Company;PetroChina Research Institute of Petroleum Exploration&Development;Unconventional Technology Research Institute of Drilling&Production Company,CNOOC Energy Technology&Services Limited)

机构地区：[1]中国石化华东油气分公司 [2]中国石油勘探开发研究院 [3]中海油能源发展股份有限公司工程技术分公司非常规技术研究院

出　　处：《中国石油勘探》2020年第6期129-134,共6页China Petroleum Exploration

摘　　要：为了解决复杂地貌条件下,压裂裂缝方位等参数测试的生产难题,提出了通过偏心电位获取煤层气井压裂裂缝方位等参数的测量方法。在远离压裂井的某一平坦区域布置测网,通过实时测量压裂过程中由注入的高矿化度压裂液和岩石破裂所产生的低电位异常而引起的地面电位梯度变化来达到解释煤层气井压裂裂缝方位等参数的目的。应用该方法在贵州织金煤层气区块和四川盆地川东彭水页岩气区块现场测试28井次,成功率达100%;测得的压裂裂缝方位(北北西—南南东)与现代区域主应力场方向吻合。为评价压裂效果、求取压裂施工参数和制定上述区块整体开发方案提供了重要依据。In order to solve the problem of hydraulic fracture parameters testing such as fracture azimuth under complex geomorphic conditions, a measurement method for obtaining these parameters by eccentric potential is proposed. By deploying a survey network in a flat area far away from the fracturing well, interpretation of hydraulic fracture parameters such as fracture azimuth of the coalbed methane wells can be achieved by measuring the ground potential gradient changes caused by the injected high-salinity fracturing fluid and the lowpotential abnormality generated by the rock fracture during the fracturing process. This method has been applied to the on-site testing in the Guizhou Zhijin coalbed methane block and the Pengshui shale gas block in the east of Sichuan Basin for 28 wells/times, with a success rate of 100%. The measured fracture azimuth(NNW-SSE) is consistent with the direction of the current regional principal stress field. It provides an important basis for evaluating the effect of fracturing, obtaining the fracturing operation parameters, and formulating the overall development plan for the above-mentioned blocks.

关 键 词：偏心电位法 测试原理 工作方法 压裂裂缝 主应力场方向 

分 类 号：TE37[石油与天然气工程—油气田开发工程]