Resistivity response of coal under hydraulic fracturing with different injection rates:A laboratory study

作     者：Mingyang Song Quangui Li Qianting Hu Yanqing Wu Guanhua Ni Yangcheng Xu Yuebing Zhang Liangping Hu Jialin Shi Jichuan Liu Yize Deng Mingyang Song;Quangui Li;Qianting Hu;Yanqing Wu;Guanhua Ni;Yangcheng Xu;Yuebing Zhang;Liangping Hu;Jialin Shi;Jichuan Liu;Yize Deng

作者机构：State Key Laboratory of Coal Mine Disaster Dynamics and ControlChongqing UniversityChongqing 400044China School of Resources and Safety EngineeringChongqing UniversityChongqing 400044China College of Safety and Environmental EngineeringShandong University of Science and TechnologyQingdao 266510China 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2022年第32卷第4期

页      面：807-819页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0819[工学-矿业工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：supported by the National Key R&D Program of China (No. 2018YFC0807805) the National Natural Science Foundation of China (No. 52074049)。 

主　　题：Resistivity Hydraulic fracturing Injection rate Fracture extension Acoustic emission 

摘      要：Resistivity will have different response characteristics to the hydraulic fracture propagation process. In this work, a resistivity testing system for hydraulic fracturing specimens was established. Resistivity and acoustic emission(AE) information were jointly analysed to determine the dynamic response characteristics of resistivity during hydraulic fracture propagation. The results show that the water and fracture exert a competitive influence on the connection structure of the circuit, and there are two significant peak resistivity points in the curve, presenting a double peak therein. The peak resistivity data of the specimen with a larger fracture area are much different from the initial value. With the increase of the rate of injection, the range of variation of the highest value that can be reached with the specimen resistivity decreases. High resistivity rates or high resistivity fluctuations exhibit rapid a release of fracture energy. The fracture failure mode dominated by shear fractures makes the formation produce a “series+parallel electrical connection structure;a calculation model of formation resistivity based on shear and tensile failure was proposed to characterize the proportion of different types of hydraulic fractures and elucidate the control effect of matrix resistivity on the electrical performance of the overall circuit structure.