页岩气吸附实验中自由空间体积的变化及其对吸附的影响Change of Void Volume in Shale Gas Adsorption Experiment and Its Influence on Adsorption
王瑞;雷虎林;吴繁华;刘壮;陈星;李永军;付美涛;
摘要(Abstract):
选取页岩样品,并以煤样为对比进行了容量法等温吸附实验,建立了考虑吸附相和基质膨胀及压缩变形的自由空间体积和吸附量计算模型,以此讨论了自由空间体积在吸附过程中随吸附平衡压力的变化趋势及其对吸附的影响。研究表明:页岩气的容量法等温吸附实验中,随着吸附平衡压力的增加,因吸附相的存在引起自由空间体积持续减小并最终趋于恒定,吸附导致基质膨胀引起自由空间体积仅有微量减小,基质压缩引起自由空间体积持续增大;在三种机理共同作用下,随吸附平衡压力的增加自由空间体积持续减小,其后趋于恒定,并再有增大的趋势;自由空间体积的变化导致吸附量发生变化,其变化趋势与自由空间体积的变化趋势相反。
关键词(KeyWords): 页岩气等温吸附;容量法;自由空间体积;吸附平衡压力
基金项目(Foundation): 油气藏地质及开发工程国家重点实验室(西南石大学)开放基金课题“深层页岩气藏气体吸附平衡诱导下的基质孔隙变形研究”(PLN2021-24);; 陕西省自然科学基础研究计划项目“储层外来流体对页岩气吸附解吸的影响研究”(AA2018JQ5148);; 陕西省教育厅自然科学研究项目“储层外来流体对页岩气产出的影响研究”(18JK0612);; 西安石油大学青年科研创新团队“复杂地层钻采工程力学行为表征及控制理论与技术”(2019QNKYCXTD04)
作者(Authors): 王瑞;雷虎林;吴繁华;刘壮;陈星;李永军;付美涛;
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