桑树勋. 二氧化碳地质存储与煤层气强化开发有效性研究述评[J]. 煤田地质与勘探, 2018, 46(5): 1-9. DOI: 10.3969/j.issn.1001-1986.2018.05.001
引用本文: 桑树勋. 二氧化碳地质存储与煤层气强化开发有效性研究述评[J]. 煤田地质与勘探, 2018, 46(5): 1-9. DOI: 10.3969/j.issn.1001-1986.2018.05.001
SANG Shuxun. Research review on technical effectiveness of CO2 geological storage and enhanced coalbed methane recovery[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 1-9. DOI: 10.3969/j.issn.1001-1986.2018.05.001
Citation: SANG Shuxun. Research review on technical effectiveness of CO2 geological storage and enhanced coalbed methane recovery[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 1-9. DOI: 10.3969/j.issn.1001-1986.2018.05.001

二氧化碳地质存储与煤层气强化开发有效性研究述评

Research review on technical effectiveness of CO2 geological storage and enhanced coalbed methane recovery

  • 摘要: 煤层CO2地质存储与CH4强化开采(CO2-ECBM)技术融温室气体减排与化石新能源开发为一体,极具发展前景。CO2-ECBM技术有效性是经济性、长期性和安全性的基础和前提,建立深部煤层CO2-ECBM有效性理论和生产技术在中国的需求尤为迫切。中国、美国、英国、澳大利亚、日本等国家在该领域开展了大量实验模拟、数值模拟和工程探索研究。研究工作表明:CO2可注性、CO2封存机制与存储容量、CH4增产效果构成了CO2-ECBM有效性的核心内涵,其中CO2可注性更为关键;CO2注入时煤储层发生体积应变效应和地球化学反应效应,其导致的渗透率快速衰减与可注性变差制约着CO2-ECBM的有效性;CO2/CH4竞争吸附与置换是主要的CO2封存机制,地层条件下CO2/CH4竞争吸附与置换封存决定了有效存储容量的主体,对于超临界CO2,改进的吸附势模型(Modified D-R model)表征计算结果与实验模拟结果的拟合度最好;通过优化注入参数、间歇性注入、先压后注、与N2交替注入等方式可以提高深部煤层的CO2可注性,试验井组煤层气生产井可实现最高3.8倍的增产效果;沁水盆地深部无烟煤CO2-ECBM技术的有效性已得到实验室研究和工程试验的初步证实。中国科学家在持续开展和不断深化CO2-ECBM技术的研究工作,CO2-ECBM有效性的关键科学技术问题有望在中国得到破解。

     

    Abstract: Technology of CO2 geological storage in coal seams for enhancement of coalbed methane recovery exhibits a promising prospect for greenhouse gas emission reduction and new fossil energy development. Technical effectiveness of CO2 enhanced coalbed methane recovery(CO2-ECBM)is a foundation for the economical, long-term and safe CO2 geological storage and CH4 production. Therefore, it is an urgent mission to establish effectiveness theory and production technology of CO2-ECBM in deep coal seams in China. Many investigations from China, US, UK, Australia, Japan and other countries have been conducted on CO2-ECBM related experimental simulation, numerical modeling and engineering implementation. The results shows that CO2 injectivity, CO2 containment mechanism, CO2 storage capacity and CH4 yield-enhancing effect constitute core connotations in the technical effectiveness of CO2-ECBM. Therein, CO2 injectivity has been the focus. CO2 injection into coal seams contributes to volumetric strain and geochemical reaction and further results in a rapid decline of permeability and CO2 injectivity, which restrict the effectiveness of CO2-ECBM. Competitive adsorption between CO2 and CH4 and their exchange could be considered as the major CO2 containment mechanism and in fact they determine the main body of the effective storage capacity under in-situ reservoir environment. As for supercritical CO2, the modified D-R model shows a best fitting with the experimental results. By means of injection parameter optimization, periodic injection, injection after fracturing, alternant injection using N2 and other adaptive approaches, CO2 injectivity could be significantly improved. After CO2 injection, the CBM yield of well group increased up to 3.8 times. Technical effectiveness of CO2-ECBM into deep anthracite in Qinshui basin has been preliminarily validated by laboratory investigations and engineering implementations. Chinese scholars devote their best to conduct and expand related research and technology on CO2-ECBM, and whereby key points of its technical effectiveness are expected to be solved in China.

     

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