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Analysis of Effects of CO_2 Injection on Coalbed Permeability: Implications for Coal Seam CO_2 Sequestration

机译：注入CO_2对煤层渗透率的影响分析：对煤层CO_2固存的意义

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摘要

A proper understanding of permeability reductions of CH4-containing coal seams after CO2 injection is essential, as coal permeability is the key parameter influencing the efficiency of enhanced coalbed methane recovery with CO2 sequestration and theoretical research on it is lacking. The main objective of this study was to accurately quantify the effects of CO2 injection on coalbed permeability. Therefore, permeability decrease coefficients and permeability rebound and recovery pressures of a binary gas (CH4 + CO2) are proposed based on the Shi-Durucan and extended Langmuir models. Then, the trends of these parameters under the influence of the main influencing factors are detailed. Specifically, the permeability decrease coefficient increased with an increase in CO2 proportion and increased rapidly when the reservoir gas pressure was low. Permeability recovery pressure decreased with an increase in CO2 proportion; the range of decrease was larger at low CO2 proportions. CO2 proportion had little effect on the permeability rebound pressure. Besides, the larger the Langmuir volume constant of CO2, the larger was the permeability decrease coefficient and permeability rebound pressure, and the smaller the permeability recovery pressure. However, the effect of the Langmuir pressure constant on these parameters was relatively weak. Finally, in light of these results, the implications of different characteristics of permeability evolution for CO2 injection pressure adjustment in the process of enhanced coalbed methane recovery with CO2 sequestration are discussed from a macroscopic perspective. The results of this study may provide a reference to select appropriate coal seams and injection pressures for CO2 sequestration.
机译：正确认识注入CO2后含CH4煤层的渗透率降低是至关重要的，因为煤的渗透率是影响CO2固存提高煤层气采收率的关键参数，因此缺乏理论研究。这项研究的主要目的是准确量化注入二氧化碳对煤层渗透率的影响。因此，基于Shi-Durucan模型和扩展的Langmuir模型，提出了二元气体（CH4 + CO2）的渗透率降低系数，渗透率反弹和恢复压力。然后，详细说明了这些参数在主要影响因素的影响下的趋势。具体地，渗透率降低系数随着CO 2比例的增加而增加，并且在储层气压低时迅速增加。渗透率恢复压力随着CO2比例的增加而降低；在低CO2比例下，下降幅度更大。 CO 2的比例对渗透率回弹压力影响很小。此外，CO 2的朗缪尔体积常数越大，渗透率降低系数和渗透率回弹压力越大，渗透率恢复压力越小。但是，朗缪尔压力常数对这些参数的影响相对较弱。最后，根据这些结果，从宏观的角度讨论了渗透率演变的不同特征对于通过CO 2固存提高煤层气采收率过程中CO 2注入压力调节的意义。这项研究的结果可为选择合适的煤层和封存二氧化碳的注入压力提供参考。

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  • 来源
    《Energy & fuels》 |2019年第7期|6606-6615|共10页
  • 作者

    Su Erlei; Liang Yunpei; Zou Quanle; Niu Fanfan; Li Lei;

  • 作者单位

    Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;

    Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;

    Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;

    Zhengzhou Engn Co Ltd, China Railway Grp 7, Zhengzhou 450052, Peoples R China;

    Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China|State Key Lab Gas Disaster Monitoring & Emergency, Chongqing 400037, Peoples R China|China Coal Technol & Engn Grp Chongqing Res Inst, Chongqing 400037, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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