液态CO2相变压裂对煤吸附甲烷的影响,Energy & Fuels

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液态CO2相变压裂对煤吸附甲烷的影响
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-01-20 , DOI: 10.1021/acs.energyfuels.2c03770
Gaofeng Liu ₁ , Baolin Li ₁ , Zhen Zhang ₁ , Huan Liu ₁ , Xiao Xiong ₂ , Xiaoming Wang ₃

Affiliation

液态CO ₂相变压裂(LCPTF)是一种提高煤层气(CBM)采收率的新型无水压裂技术。目前相关研究主要集中在探索LCPTF对煤中纳米孔结构的转化作用。然而，其对气体吸附能力的影响却鲜有报道。本研究针对 LCPTF 诱导的煤。通过压汞法、低温 N _{2综合测量评估中孔 (2–50 nm) 和大孔 (>50 nm) 的结构变化及其对气体吸附能力的影响}吸附和等温吸附。结果表明，LCPTF 对大孔具有扩大作用，导致孔径和体积增加以及孔比表面积降低。LCPTF的扩孔转化作用导致孔径增大，中孔孔容和孔比表面积减小。LCPTF后孔结构的变化导致吸附常数a的减小和吸附常数b的增加，表明 LCPTF 对吸附容量的降低作用以及对解吸容量的增强作用。提出了一种基于含气饱和度和临界解吸压力变化的LCPTF提高煤层气可采性效果评价新方法。本研究从吸附和解吸的角度探讨了LCPTF提高煤层气采收率的机理，为LCPTF的技术改进和现场应用优化提供了理论指导，以确保煤层气更可靠、更高效地采收。

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Effects of Liquid CO2 Phase Transition Fracturing on Methane Adsorption of Coal

Liquid CO₂ phase transition fracturing (LCPTF) is a kind of novel waterless fracturing technology for enhancing the coalbed methane (CBM) recovery. Relevant current studies are focused on exploring the transformed effect of LCPTF on the nanopore structure in coal. However, its influence on gas adsorption capacity has been rarely reported. This study addresses coal induced with LCPTF. The structure alterations of mesopores (2–50 nm) and macropores (>50 nm) and their effects on the gas adsorption capacity are evaluated with comprehensive measurements of a mercury intrusion porosimetry, low-temperature N₂ adsorption, and isothermal adsorption. The results indicate that LCPTF has an enlarged effect on macropores, resulting in an increase in pore size and volume and a reduction of the pore specific surface area. The pore-enlarged-transformed effects of LCPTF cause an increase in pore size and a reduction of the pore volume and pore specific surface area of mesopores. The variations of the pore structure after LCPTF cause a reduction of the adsorption constant a and the increase in the adsorption constant b, indicating LCPTF’s reductive effect on adsorption capacity as well as its enhanced effect on desorption capacity. A novel effect evaluation method of LCPTF for improving CBM recoverability is proposed based on the variations of gas saturation and critical desorption pressure. This study examines, from the perspective of adsorption and desorption, the mechanism of LCPTF for enhancing CBM recovery, which provides theoretical guidance for LCPTF’s technical improvement and optimization of field application so as to secure a more reliable and efficient CBM recovery.

更新日期：2023-01-20

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