页岩气渗流数学模型

被引:23
作者
夏阳 [1 ]
金衍 [1 ]
陈勉 [1 ]
陈康平 [1 ,2 ]
机构
[1] 中国石油大学(北京)石油工程教育部重点实验室
[2] School for Engineering of Matter,Transport and Energy,Arizona State
基金
国家杰出青年科学基金; 国家自然科学基金重大项目;
关键词
页岩气; 渗流; 非平衡吸附理论; 数值模拟;
D O I
暂无
中图分类号
TE312 [油气水渗流力学];
学科分类号
摘要
针对页岩气藏流体运移机理复杂、传统模型难以准确描述的难题,本文综合考虑页岩气在孔隙中的黏性流动、Knudsen扩散以及吸附气的表面扩散和因岩石变形引起的滑移分别建立自由气和吸附气扩散方程,建立页岩气在基质与裂缝中的渗流数学模型,并采用非线性非平衡Langmuir吸附理论分析页岩气渗流过程中的解吸附机理.通过数值模拟方法研究了不同流动机制对页岩气产量的影响,结果表明,吸附气的表面扩散与滑移对页岩气产量的影响均在0.1%以下,可以忽略;黏性流动与Knudsen扩散主导页岩气的渗流;非平衡吸附速率对页岩气产量影响较大,吸附速率越大,产量越大.本文建立的模型能较好地揭示页岩气的复杂渗流机理,并为页岩气藏的开发提供了科学基础.
引用
收藏
页码:2259 / 2271
页数:13
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