页岩气藏纳米孔隙微观渗流动态研究  

Shale Gas Reservoir Nanometer-pore Microscopic Seepage Dynamic Research

作　　者：李勇明[1] 姚锋盛[1] 赵金洲[1] 张雪萍[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室西南石油大学,成都610500

出　　处：《科学技术与工程》2013年第10期2657-2661,共5页Science Technology and Engineering

基　　金：中国石油科技创新基金(2011D-5006-0201);新世纪优秀人才支持计划(NCET-11-1062);四川省杰青学术带头人资助计划(2012JO0010);西南石油大学研究生创新基金(GIFSS0706)资助

摘　　要：页岩储层孔隙结构复杂,孔隙空间小,纳米结构所占比例大,气体主要吸附于纳米孔隙表面。基于分析页岩纳米孔隙结构和划分孔隙内流态后,考虑克努森扩散、气体滑脱、解吸和干酪根扩散等多种现象,推导微观孔隙内气体渗流物理模型的物理渗流模型,并将得到的计算结果与达西流情况进行对比,发现多种效应存在下的渗流机制复杂,压降慢,累计产量大,生产周期长。Shale gas reservoirs is characterized by complex pore structure, small pore space, large proportion of nanostructures, and gas adsorbed on the surface of the nanometer-pores. A seepage model is established in microscopic pore based on the analysis of the nanometer-pores structure and division flow pattern in pore, the consideration of multiple phenomena, for exanlple Knudsen diffusion, gas slippage, desorption and kerogen diffusion. After comparing the calculation results of this seepage model to Darcy flow, indicate extremely complex seepage mechanism under the presence of multiple effects, and slow pressure drop, large cumulative production, long production cycle.

关 键 词：页岩气 纳米孔隙 流态划分 滑脱-扩散-解吸 渗流动态 

分 类 号：TE312[石油与天然气工程—油气田开发工程]