Evolution law of the pore structure of CO2-H2O-coal in liquid CO2-ECBM

IF 7.2 2区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY Journal of CO2 Utilization Pub Date : 2024-11-01 DOI:10.1016/j.jcou.2024.102971
Xiaojiao Cheng , Hu Wen , Shixing Fan , Bocong Liu , Rijun Li , Yanhui Xu , Wen Wang
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Abstract

Liquid CO2 enhancing coalbed methane recovery (CO2-ECBM) is an effective and intrinsically reliable gas drainage technology. Injection of liquid CO2 into coal seam has the dual effect of increasing the permeability of the coal and rock and strengthening the recovery of gas, which is manifested primarily as “pressure cracking, low temperature frostbite, physical extraction and chemical corrosion, phase change pressurization, low viscosity permeability, competitive adsorption”. In this paper, the acidification and corrosion of CO2-H2O-coal was studied in physical and chemical extraction by experimental test and comparative analysis. The liquid CO2 acidification reference group and the variable group experiment were designed. On the basis of the pH value of the aqueous solution, the content of major elements and minerals in coal, the minerals involved in chemical reaction, and their specific gravity were deduced. Variation in pore volume, specific surface area, and pore fractal characteristics were quantitatively and qualitatively analyzed. The experimental results show that the higher the pressure, the higher the content of carbonic acid dissolved in water and the amount of H+ ionized by carbonic acid. The longer the reaction time, the greater the mineral content involved in the chemical reaction, and the H+ in the water sample is consumed in large quantities. The elements of Na, K, Ca, Mg, Al, Si, S, P, and Ti decreased with increasing pressure, and the maximum decreases were 0.004 %, 0.024 %, 1.095 %, 0.028 %, 0.220 %, 0.304 %, 0.006 %, 0.003 % and 0.029 %, respectively. The decrease in Ca element was the largest, indicating that Ca-bearing minerals participate in the reaction. Calcite, kaolinite, and illite were the main minerals involved in the chemical reaction of CO2-H2O-coal. The pores (d > 100 nm) and transition pores (10 < d < 100 nm) in the sample were further developed, and the pore volume increased significantly, forming a good gas migration channel. In addition, the number of new micropores (2 < d < 10 nm) increases, the specific surface area increases significantly, and the complexity of the pores increases, forming a good reservoir.
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液态 CO2-ECBM 中 CO2-H2O 煤孔隙结构的演变规律
液态二氧化碳提高煤层气采收率(CO2-ECBM)是一种有效且内在可靠的瓦斯抽采技术。向煤层注入液态 CO2 具有提高煤岩透气性和强化瓦斯采收的双重作用,主要表现为 "压力裂解、低温冻伤、物理抽采和化学腐蚀、相变增压、低粘度渗透、竞争吸附 "等。本文通过实验测试和对比分析,研究了 CO2-H2O 煤在物理萃取和化学萃取中的酸化和腐蚀问题。设计了液态 CO2 酸化参照组和变量组实验。根据水溶液的 pH 值,推断出煤中主要元素和矿物质的含量、参与化学反应的矿物质及其比重。对孔隙体积、比表面积和孔隙分形特征的变化进行了定量和定性分析。实验结果表明,压力越高,水中溶解的碳酸含量和碳酸电离出的 H+ 量越高。反应时间越长,参与化学反应的矿物质含量越高,水样中的 H+ 被大量消耗。随着压力的增加,Na、K、Ca、Mg、Al、Si、S、P、Ti 元素的含量分别减少了 0.004 %、0.024 %、1.095 %、0.028 %、0.220 %、0.304 %、0.006 %、0.003 % 和 0.029 %。钙元素的降幅最大,表明含钙矿物参与了反应。方解石、高岭石和伊利石是参与 CO2-H2O 煤化学反应的主要矿物。样品中的孔隙(d > 100 nm)和过渡孔隙(10 < d < 100 nm)进一步发育,孔隙体积明显增大,形成了良好的气体迁移通道。此外,新的微孔(2 < d < 10 nm)数量增加,比表面积显著增大,孔隙的复杂性增加,形成了良好的储层。
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来源期刊
Journal of CO2 Utilization
Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.90
自引率
10.40%
发文量
406
审稿时长
2.8 months
期刊介绍: The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.
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