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

doi:10.3969/j.issn.1672-7703.2020.06.014

Abstract

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.

CLC Number:

Tang Jianxin, Zhang Xin, Song Honglu, Chen Yun. Trial and discussion of measuring the fracture parameters of coalbed methane wells using the ‘eccentric potential’ method[J]. China Petroleum Exploration, 2020, 25(6): 129-134.

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