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| Preliminary exploration into the monitoring technology for distributed weak electric field during hydraulic fracturing for shale gas extraction |
WU Wen1( ), WANG Meng1,2(), YANG Di-Kun3, CHEN Mo1, REN Lin-Bin1 |
1. School of Geophysics and Information Technology, China University of Geosciences(Beijing), Beijing 100083,China
2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences(Beijing), Beijing 100083, China
3. Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen 518055,China |
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Abstract In the process of hydraulic fracturing for shale gas extraction, the injection, flowback, retention, and absorption of fracturing fluids will cause changes in electric fields in the case of the excitation by the electromagnetic field from an artificial source in a far area or the excitation by the geoelectric field. The time-dependent change in the information on fracturing can be reflected by monitoring the change in weak electric fields above the hydraulic fracturing area. To meet the needs of the real-time monitoring of the fracturing field, this study focuses on the preliminary study of the monitoring technology based on the nodal acquisition devices of distributed weak electric fields. The monitoring system only collects two horizontally orthogonal electric field signals, monitors the real-time information on the electric field within a certain range, and transmits the preliminarily processed data back to the data center in a wireless way. Test results show that the monitoring system has stable performance, a standby time of more than 10 days, and high sealing performance, and is applicable to complex field environments. Therefore, this monitoring system can provide important technical support for obtaining images of fracturing fluid migration in the future.
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Received: 20 August 2021
Published: 21 June 2022
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Corresponding Authors:
WANG Meng
E-mail: 2010200030@cugb.edu.cn;wangmeng@cugb.edu.cn
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Schematic diagram of weak electric field monitoring in fracturing
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Overall structure block diagram of monitoring system
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Schematic diagram of x-direction electric field signal conditioning circuit
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Physical diagram of core acquisition circuit
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Front (left) and back (right) of the mechanical package
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Block diagram
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Upper computer running interface
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Schematic diagram of field test
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East West test data of instrument A on May 29
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