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Investigation on the microwave heating technology for coalbed methane recovery

机译：煤层气回收微波加热技术研究

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摘要

Microwave heating is an efficient thermal stimulation approach in developing coalbed methane (CBM). In this paper, a new microwave heating technology for CBM is proposed and two structure schemes of waveguide antennas for heating are designed. After characterizing the mathematical model of the microwave coaxial antenna radiation, the numerical model of coal reservoir heated by microwave is established, which couples both the electromagnetic field and the heat transfer. The electromagnetic field distribution and the temperature changing law in coal reservoir during microwave heating process are solved numerically and verified by the designed experiment. A parametric study on heating effect yields an optimized structure of the microwave antenna, which is SD 6 x R8 and alpha = 15 degrees. After irradiated by the optimal antenna for 120 min, the average temperature rises to 62 degrees C (from 20 degrees C) and the energy efficiency reaches 85%. In different coal reservoirs, the maximum temperature ranges from 169 degrees C to 1586 degrees C and the maximum temperature gradient ranges from 2.52 degrees C/mm to 37.19 degrees C/mm, which are beneficial to the crack propagation. The microwave heating technology can provide fast and sufficient energy to raise the temperature of coal reservoir and is feasible for enhancing the CBM recovery. (C) 2021 Elsevier Ltd. All rights reserved.
机译：微波加热是开发煤层气（CBM）的有效热刺激方法。在本文中，提出了一种用于CBM的新微波加热技术，并设计了用于加热的波导天线的两个结构方案。在表征微波同轴天线辐射的数学模型之后，建立了微波加热的煤储层的数值模型，其耦合电磁场和传热。微波加热过程中煤储层的电磁场分布和温度变化法在数字上通过设计实验进行了验证。加热效果的参数研究产生了微波天线的优化结构，其是SD 6 x R8和α= 15度。在由最佳天线照射120分钟后，平均温度升至62℃（从20摄氏度），能量效率达到85％。在不同的煤储层中，最大温度范围从169摄氏度到1586℃，最高温度梯度范围为2.52摄氏度至37.19摄氏度，这有利于裂纹传播。微波加热技术可以提供快速且充分的能量以提高煤储层的温度，可用于增强CBM恢复。 （c）2021 elestvier有限公司保留所有权利。

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  • 来源
    《Energy》 |2021年第1期|121450.1-121450.12|共12页
  • 作者

    Lan Wenjian; Wang Hanxiang; Liu Qihu; Zhang Xin; Chen Jingkai; Li Ziling; Feng Kun; Chen Shengshan;

  • 作者单位

    China Univ Petr East China Natl Engn Lab Offshore Geophys & Explorat Equipme Qingdao 266580 Peoples R China|China Univ Petr East China Coll Mech & Elect Engn Qingdao 266580 Peoples R China;

    China Univ Petr East China Natl Engn Lab Offshore Geophys & Explorat Equipme Qingdao 266580 Peoples R China|China Univ Petr East China Coll Mech & Elect Engn Qingdao 266580 Peoples R China;

    PetroChina Coalbed Methane Co Ltd Beijing 100028 Peoples R China;

    China Univ Petr East China Natl Engn Lab Offshore Geophys & Explorat Equipme Qingdao 266580 Peoples R China|China Univ Petr East China Coll Mech & Elect Engn Qingdao 266580 Peoples R China;

    China Univ Petr East China Natl Engn Lab Offshore Geophys & Explorat Equipme Qingdao 266580 Peoples R China|China Univ Petr East China Coll Mech & Elect Engn Qingdao 266580 Peoples R China;

    PetroChina Coalbed Methane Co Ltd Beijing 100028 Peoples R China;

    PetroChina Coalbed Methane Co Ltd Beijing 100028 Peoples R China;

    China Univ Petr East China Natl Engn Lab Offshore Geophys & Explorat Equipme Qingdao 266580 Peoples R China|China Univ Petr East China Coll Mech & Elect Engn Qingdao 266580 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Coal reservoir; Microwave heating; Coalbed methane (CBM); Temperature; Microwave antenna;

    机译：煤储层;微波加热;煤层甲烷（CBM）;温度;微波天线;

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