Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 1: 144 - 152

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.01.017

Drilling & Production Engineering

Optimization of process parameters for microwave-enhanced coalbed methane mining technology at mine scale

  • WANG Xiyou ,
  • QIN Yang ,
  • LIU Ziwei ,
  • ZHU Jingyi ,
  • XIE Shiyi ,
  • JIN Xinxiu ,
  • DU Bodi ,
  • YU Jialu
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  • 1. PetroChina Liaohe Oilfield Company, Panjin, Liaoning 124010, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    3. PetroChina Changqing Oilfield Company, Xi′an, Shaanxi 710018, China;
    4. PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China;
    5. PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, China;
    6. The University of New South Wales, Sydney 1466, Australia

Received date: 2023-04-24

  Revised date: 2024-11-24

  Online published: 2025-05-13

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Abstract

Enhancing the recovery rate of coalbed methane is an essential requirement for achieving large-scale and effective development of coalbed methane. Existing studies have shown that microwaves have the feasibility of improving coalbed methane recovery rate at the core scale, but relevant studies at the mine scale are relatively scarce. For this reason, a microwave heating well model at the mine scale is established to couple the electromagnetic field, temperature field and mechanical field within the coalbed, to explore the influencing factors of microwave heating parameters, and to optimize the process parameters, thereby ensuring the effectiveness and stability of microwave heating wells. The study shows that: Microwave heating wells are mainly vertical or horizontal wells, which are made of copper waveguides (BJ 22 or BJ 26 type) and ceramic casing materials, the temperature and thermal stress in the coalbed and wellbore are positively correlated with microwave power and heating time. The coalbed in the vicinity of the well generates heat by its own dielectric loss, while the coalbed in the area far from the well mainly relies on contact heat transfer to increase temperature. A microwave operating mode of 500 W to 100 W over 33 days has improved the effectiveness and operational stability of the coalbed. Optimizing process parameters alone cannot meet practical application requirements; therefore, a combination of intermittent cyclic variable power microwave heating patterns, microwave-absorbing medium enhanced coalbed thermal conduction technology, and hydraulic fracturing techniques should be employed to enhance the practical effects of microwave heating of the reservoir. The study results can provide technical support for the promotion and application of microwave-enhanced coalbed methane mining technology.

Key words： coal rock; coalbed methane; microwave heating; thermal stress; finite element software

Cite this article

WANG Xiyou , QIN Yang , LIU Ziwei , ZHU Jingyi , XIE Shiyi , JIN Xinxiu , DU Bodi , YU Jialu . Optimization of process parameters for microwave-enhanced coalbed methane mining technology at mine scale[J]. Special Oil & Gas Reservoirs, 2025 , 32(1) : 144 -152 . DOI: 10.3969/j.issn.1006-6535.2025.01.017

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