Experimental Study on Active Thermal Protection for Electronic Devices Used in Deep−Downhole−Environment Exploration

Shihong Ma, Shuo Zhang, Jian Wu, Yongmin Zhang, Wenxiao Chu () and Qiuwang Wang
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Shihong Ma: Key Laboratory of Thermo−Fluid Science and Engineering, MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Shuo Zhang: Xi’an Shanguang Energy Co., Ltd., Xi’an 710075, China
Jian Wu: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Yongmin Zhang: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Wenxiao Chu: Key Laboratory of Thermo−Fluid Science and Engineering, MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Qiuwang Wang: Key Laboratory of Thermo−Fluid Science and Engineering, MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2023, vol. 16, issue 3, 1-16

Abstract: Electronic devices are commonly used for exploiting and extracting shale oil in deep downhole environments. However, high−temperature−and−pressure downhole environments jeopardize the safe operation of electronic components due to their severe thermal conditions. In the present study, an active thermal−insulation system is proposed, which consists of a spiral annular cooling plate (ACP), a thermal storage container with phase−change material (PCM) and an aerogel mat (AM). The effect of the ACP’s structure, layout and working−medium flowrate on the heat−protection performance were experimentally measured; temperature−control capability and system−operating time were used as the criteria. The results show that the AM layer is necessary and that the inner−ACP case displays better thermal−protection performance. Next, a dimensionless temperature−control factor (TCF) was proposed to evaluate the trade−off between temperature control and the system’s operating time. Note that the TCF of the spiral ACP can be improved by 1.62 times compared to the spiral−ACP case. Since the lower flowrate allows better TCF and longer operating times, intermittent control of the flowrate with a 1−minute startup and 2−minute stopping time at 200 mL/min can further extend the system’s operating time to 5 h, and the TCF is 3.3 times higher than with a constant flowrate of vm = 200 mL/min.

Keywords: active thermal protection; shale?oil extraction; annular cooling plate; operating time; temperature?control factor; intermittent flowrate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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