摘要
本研究旨在从孔隙结构和分形维数的角度,揭示二硫化碳(CS_(2))萃取对煤中纳米孔隙的影响。研究中采用高压压汞、低温液氮吸附和低温二氧化碳吸附联合测试技术,并以分形理论为理论依据。结果表明,CS_(2)萃取煤中大孔的体积增大,分形维数减小,即扩孔效应和降维效应。介孔的体积和分形维数均增大,即扩孔效应和升维效应。而微孔的体积和分形维数均减小,即扩孔转化效应和降维效应。分析认为,CS_(2)萃取的扩孔效应有助于改善孔隙的连通性,而降维效应有利于降低孔隙结构的非均质性,提高煤层气的解吸能力,本研究为CS_(2)萃取应用于煤储层的增透改造提供了理论基础。
The study aims to reveal the effect of carbon disulfide(CS_(2))extraction on nanopores in coal from the perspective of pore structure and fractal dimension.High pressure mercury intrusion,low temperature liquid nitrogen adsorption and low temperature carbon dioxide adsorption were used in the study,and fractal theory was used as the theoretical basis.The results show that the volume of macropores in CS_(2) extracted coal increases and the fractal dimension decreases,called the pore enlarged effect and dimension reduced effect.The volume and fractal dimension of mesopores increase,called the pore enlarged effect and dimension increased effect.However,the volume and fractal dimension of micropores both decrease,called the pore enlarged and transformed effect and dimension reduced effect.The analysis shows that the pore enlarged effect of CS_(2) extraction is helpful to improve the connectivity of pores,while the dimension reduced effect is conducive to reducing the heterogeneity of pore structure and improve the desorption capacity of gas.This study provides a theoretical basis for the application of CS_(2) extraction in the permeability enhancement of coal reservoirs.
作者
任威
张利军
乔磊
REN Wei;ZHANG Lijun;QIAO Lei(Shanxi Gaohe Energy Co.,Ltd,Changzhi 047100,China)
出处
《煤》
2026年第2期43-47,共5页
Coal
