The organic matter and pyrite in coal are prone to oxidative dissolved, transforming solid-phase dissolution into multi-gas transport spaces. Therefore, it is necessary to explore the feasibility and potential assessment of enhancing recovery of coalbed methane (CBM) by oxidative dissolution. Guided by the idea of “contradiction transformation-net material removal”, based on theory analysis and numerical simulations, the concept of oxidation treatment synergistic hydraulic fracturing in CBM reservoirs is demonstrated. Furthermore, the recovery enchantment potential of CBM wells by oxidation treatment is evaluated. The dissolution of organic matter and pyrite in coal lead to the initiation of a large number of dissolved pores and fractures. The concept of oxidation treatment synergistic hydraulic fracturing in CBM reservoirs focuses on the characteristics of low permeability, difficulty in CBM desorption, which often lead to formation damage during reservoir stimulation. Leveraging the differential oxidative dissolution of coal, promoting the extension of fractures to form oxidation treatment synergistic hydraulic fracturing fractures with high conductivity. Simultaneously, the oxidant dissolves coal fines, reducing coal fines particle size. Compared with hydraulic fractured CBM wells, oxidation treatment synergistic hydraulic fracturing well achieves an earlier peak gas production. Over 20 years, there’s a maximum increase of 56.24% in cumulative gas production of oxidation treatment synergistic hydraulic fracturing well, further validating the feasibility of enhancing recovery of CBM reservoirs by oxidation treatment. This method offers a new approach to enhance recovery in tight CBM reservoirs, holding significant implications for the economic development of such reserves in the future.

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Feasibility and Potential Evaluation of Recovery Enhancement for Coalbed Methane Reservoir by Oxidation Treatment

  • Yu Lu,
  • Yan-chao Li,
  • Teng Zhang,
  • Yi-li Kang,
  • Chong Lin,
  • Yue Hu,
  • Hao Jiang

摘要

The organic matter and pyrite in coal are prone to oxidative dissolved, transforming solid-phase dissolution into multi-gas transport spaces. Therefore, it is necessary to explore the feasibility and potential assessment of enhancing recovery of coalbed methane (CBM) by oxidative dissolution. Guided by the idea of “contradiction transformation-net material removal”, based on theory analysis and numerical simulations, the concept of oxidation treatment synergistic hydraulic fracturing in CBM reservoirs is demonstrated. Furthermore, the recovery enchantment potential of CBM wells by oxidation treatment is evaluated. The dissolution of organic matter and pyrite in coal lead to the initiation of a large number of dissolved pores and fractures. The concept of oxidation treatment synergistic hydraulic fracturing in CBM reservoirs focuses on the characteristics of low permeability, difficulty in CBM desorption, which often lead to formation damage during reservoir stimulation. Leveraging the differential oxidative dissolution of coal, promoting the extension of fractures to form oxidation treatment synergistic hydraulic fracturing fractures with high conductivity. Simultaneously, the oxidant dissolves coal fines, reducing coal fines particle size. Compared with hydraulic fractured CBM wells, oxidation treatment synergistic hydraulic fracturing well achieves an earlier peak gas production. Over 20 years, there’s a maximum increase of 56.24% in cumulative gas production of oxidation treatment synergistic hydraulic fracturing well, further validating the feasibility of enhancing recovery of CBM reservoirs by oxidation treatment. This method offers a new approach to enhance recovery in tight CBM reservoirs, holding significant implications for the economic development of such reserves in the future.