中国石油勘探 ›› 2020, Vol. 25 ›› Issue (6): 129-134.DOI: 10.3969/j.issn.1672-7703.2020.06.014

• 工程技术 • 上一篇    

偏心电位法测定煤层气井裂缝参数的尝试和探讨

唐建信1,张鑫2,宋鸿璐3,陈韵3   

  1. 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
  • 出版日期:2020-11-12 发布日期:2020-11-12
  • 基金资助:
     

Trial and discussion of measuring the fracture parameters of coalbed methane wells using the ‘eccentric potential’ method

Tang Jianxin1,Zhang Xin2,Song Honglu3,Chen Yun3   

  1. 1 Sinopec East China Oil & Gas Company; 2 PetroChina Research Institute of Petroleum Exploration & Development; 3 Unconventional Technology Research Institute of Drilling & Production Company, CNOOC Energy Technology & Services Limited
  • Online:2020-11-12 Published:2020-11-12
  • Supported by:
     

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。

 

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

Abstract: The ‘eccentric potential’ method is proposed as a measurement method for monitoring hydraulic fracture parameters under complex geomorphic conditions. A survey network is deployed in a flat area at a distance from the fracturing well, allowing interpretation of hydraulic fracture parameters such as fracture azimuth of coalbed methane wells by measuring the gradients of ground potential changes following the injection of high-salinity fracturing fluid and the low-potential abnormalities generated by rock fractures during the fracturing process. The method has been applied in on-site measurement of 28 wells in the Zhijin coalbed methane block of the Guizhou province and in the Pengshui shale gas block in the eastern part of the Sichuan Basin, with a success rate of 100%. In each case, the measured fracture azimuth (NNW-SSE) was consistent with the direction of the regional principal stress field. This provides an important basis for evaluating the effect of fracturing, obtaining operational parameters for fracturing, and formulating an overall development plan for these blocks.

中图分类号: