Numerical study on the injection of heated CO
            <sub>2</sub>
            to enhance CH
            <sub>4</sub>
            recovery in water-bearing coal reservoirs

Mu, Yongliang; Fan, Yu; Wang, Jiren; Fan, Nan

doi:10.1080/15567036.2019.1683654

Cited by 11 publications

(2 citation statements)

References 32 publications

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“…For instance, Fan et al simulated the injection of mixed gas (N 2 /CO 2 ) into the coal reservoir and found that the migration radius will increase with the injection pressure and N 2 injection accelerates the desorption and migration of CH 4 , which promotes the temperature drop near the production well. Mu et al, on the basis of the established thermal–fluid–solid coupling model, found that the initial water saturation in the reservoir is negatively related to the migration distance of CO 2 . In addition, water retards the permeability decline caused by CO 2 adsorption by hindering CO 2 migration.…”

Section: Modelings Of General Performances In Co2-ecbmmentioning

confidence: 99%

Recent Advances and Perspectives of CO₂-Enhanced Coalbed Methane: Experimental, Modeling, and Technological Development

et al. 2023

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Carbon dioxide (CO2)-enhanced coalbed methane recovery (CO2-ECBM) is a critical way to increase methane production and reduce greenhouse gas (CO2 and CH4) emissions. As captured CO2 is continuously injected in the coal seams, a low cost of CO2 sequestration and high efficiency of CH4 recovery can be achieved via the flooding and replacing effects driven by the injected CO2 flow. Scientific insights into the complex process of CO2-ECBM in experiments, modelings, and technological developments need to be made to propose appropriate countermeasures. This review first highlights the progress of CO2-ECBM under laboratory conditions, e.g., the binary gas competitive adsorption and gas displacement experiments in the macroscale and porous structure tests using technologies of nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), and computed tomography (CT) in the microscale. Then, the advances of mathematical models for changing in coal permeability and porosity during CO2-ECBM are reviewed, accompanying with the multi-field and multi-phase coupling responses of competitive sorption, diffusion, gas–water seepage, heat transfer, and solid deformation. Furthermore, the field pilot tests of CO2-ECBM in various countries and regions are also covered to reveal the key technical challenges confronted with the development of CO2-ECBM technology. The perspectives in experiments, models, and field pilots of CO2-ECBM are made, which include but are not limited to the following: conducting a core CH4/CO2 flooding test under in situ conditions, modeling CO2-ECBM with real fractures/faults and coal failure, developing a new method for gas migration and leakage monitoring in the field, and enacting relevant standards, laws, and regulations to promote CO2-ECBM.

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Section: Modelings Of General Performances In Co2-ecbmmentioning

confidence: 99%

Recent Advances and Perspectives of CO₂-Enhanced Coalbed Methane: Experimental, Modeling, and Technological Development

et al. 2023

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“…The experimental results showed that the microwave heating method could significantly improve the desorption capacity of methane. Multiple numerical simulation results have shown that the heat-injection method can improve the CBM recovery rate. , Xie and Zhao developed a thermal-fluid–solid coupling mathematical model suitable for low-permeability coalbed methane mining. The results showed that the temperature of the coal seam directly affects the CBM output.…”

Section: Introductionmentioning

confidence: 99%

Theory and Engineering Practice of Intermittent Heat Injection-Enhanced Coalbed Methane Extraction

Hu,

Feng,

Zhou

2023

ACS Omega

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Because of the strong adsorption characteristics of methane and the low permeability of coal seams, the extraction efficiency of coalbed methane (CBM) is very low. Here, based on the energy conservation equation, we propose the theory of heat injection-enhanced CBM extraction. We developed a device for heat injection-enhanced CBM extraction and performed an on-site heat injection test in the Chengzhuang coal mine. The results showed that when the water injection rate was 0.5 m3/h, the heat injection temperature was 145 °C, with two heat injections, yielding the best CBM extraction effect. This could fully utilize the heat injection equipment and achieve a fast, safe, and efficient extraction. The gas production law of the intermittent heat injection-enhanced CBM extraction method had obvious stages; the CBM concentration and daily gas production were very low during the heat injection stage but were greatly improved during the extraction stage after heat injection. The highest CBM concentration reached 100%, and the maximum daily gas production of CBM increased by 1269 times. The variation law of the cumulative gas production with time was fitted using Wang’s empirical formula. Comparative analysis showed that, compared to traditional extraction, intermittent heat injection shortened the extraction time by 6.6 years. Compared with other enhanced CBM extraction methods, the intermittent heat injection method had obvious technical advantages and greater improvements in concentration and CBM extraction speed. Therefore, the results are of great significance for improving the recovery rate of CBM and for reducing greenhouse gas emissions.

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Reasonable start time of carbon dioxide injection in enhanced coalbed methane recovery involving thermal-hydraulic-mechanical couplings

et al. 2023

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Numerical study on the injection of heated CO ₂ to enhance CH ₄ recovery in water-bearing coal reservoirs

Cited by 11 publications

References 32 publications

Recent Advances and Perspectives of CO₂-Enhanced Coalbed Methane: Experimental, Modeling, and Technological Development

Recent Advances and Perspectives of CO₂-Enhanced Coalbed Methane: Experimental, Modeling, and Technological Development

Theory and Engineering Practice of Intermittent Heat Injection-Enhanced Coalbed Methane Extraction

Reasonable start time of carbon dioxide injection in enhanced coalbed methane recovery involving thermal-hydraulic-mechanical couplings

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Numerical study on the injection of heated CO 2 to enhance CH 4 recovery in water-bearing coal reservoirs

Cited by 11 publications

References 32 publications

Recent Advances and Perspectives of CO2-Enhanced Coalbed Methane: Experimental, Modeling, and Technological Development

Recent Advances and Perspectives of CO2-Enhanced Coalbed Methane: Experimental, Modeling, and Technological Development

Theory and Engineering Practice of Intermittent Heat Injection-Enhanced Coalbed Methane Extraction

Reasonable start time of carbon dioxide injection in enhanced coalbed methane recovery involving thermal-hydraulic-mechanical couplings

Contact Info

Product

Resources

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Numerical study on the injection of heated CO ₂ to enhance CH ₄ recovery in water-bearing coal reservoirs

Recent Advances and Perspectives of CO₂-Enhanced Coalbed Methane: Experimental, Modeling, and Technological Development

Recent Advances and Perspectives of CO₂-Enhanced Coalbed Methane: Experimental, Modeling, and Technological Development