樊冬艳;姚军;金强;孙海;曾慧;

• 1:中国石油大学(华东)地质资源与地质工程博士后流动站

• 2:中国石油大学(华东)石油工程学院

摘要(Abstract)：

针对页岩气藏中水平井结合体积压裂开采、吸附气和游离气共存的方式,建立考虑储层改造体积的页岩气藏复合模型,定义新的参数表征基质中吸附解吸气量与游离气弹性释放量的比值,且将储层分为人工主裂缝区域、储层改造区域和未改造区域,其中人工主裂缝基于离散裂缝模型降维处理,储层改造区域为双孔双渗模型,未改造区域为单孔隙介质模型;模型采用有限元方法进行求解,与双重介质解析解对比验证算法的正确性.结果表明:页岩气藏水平井体积压裂复合模型主要存在主裂缝周围线性流、过渡区域拟稳态、窜流阶段、未改造区域的拟径向流动和到达边界后的拟稳态等5个主要流动阶段,且考虑吸附解吸后,定产量生产所需压差小,压力波传播到边界时间长,压力导数曲线凹槽更加明显,定井底流压生产时压裂水平井产量更大,稳产时间更长;储层改造体积越大,到达区域拟稳态流越晚,可判定储层改造体积;Langmuir吸附体积越大,压力波传播越慢,所需压差越小,压力导数曲线凹槽越深,页岩气藏稳产时间越长,产量越大,但产量的增幅越来越小.

关键词(KeyWords)：页岩气藏;体积压裂;储层改造区域;复合模型;有限元法

Abstract:

Keywords:

基金项目(Foundation):国家自然科学基金重点项目(51234007);; 山东省自然科学基金项目(ZR2014EL016,ZR2014EEP018);; 中国博士后科学基金项目(2014M551989)

作者(Author):樊冬艳;姚军;金强;孙海;曾慧;

Email:

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