低渗透砂岩气藏气体渗流机理实验研究现状及新认识  

Experimental research status and several novel understandings on gas percolation mechanism in low-permeability sandstone gas reservoirs

作　　者：高树生[1,2] 熊伟[2] 刘先贵[2] 胡志明[2] 薛惠[2] 

机构地区：[1]中国地质大学(北京)能源学院 [2]中国石油勘探开发研究院廊坊分院

出　　处：《天然气工业》2010年第1期52-55,共4页Natural Gas Industry

基　　金：国家科技支撑计划(编号:2006BAB03B03)的部分成果

摘　　要：研究低渗透气藏的渗流机理,有利于制订合理、有效的开发方案。低渗透砂岩气藏气体的渗流机理实验研究主要集中在气体的滑脱效应、启动压力梯度、高速非达西流效应和含水饱和度影响等4个方面。为此,分析总结了国内外有关低渗透砂岩气藏渗流机理的研究成果,并有针对性地进行了大量低渗透砂岩气体渗流机理的实验研究,获得了一些新认识:①实际生产过程中,由于低渗透气藏的废弃压力很高,故没有必要考虑滑脱效应的影响;②低渗透气藏气体渗流过程中存在启动压力梯度,与渗透率呈反比;③低渗透气藏开发过程中发生高速非达西流效应具有临界渗透率值;④含水饱和度对低渗透气藏气体渗流特征影响很大。上述认识对于低渗透致密砂岩气藏开发具有指导意义。The study on the percolation mechanism of low-permeability gas reservoirs is conducive to establish reasonable and effective development policies.For the low-permeability sand gas reservoirs,experimental studies of gas percolation mechanism mostly focus on four areas,i.e.,gas slippage effect,starting pressure gradient,high-speed non-Darcy flow effect,and the impact of water saturation.The domestic and foreign research data about low-permeability sandstone gas reservoir flow mechanism are analyzed and summarized.After carrying out sufficient experimental studies targeting the gas percolation mechanism of low-permeability sandstone,we got several new understandings:First,in the actual production process,due to the high abandonment pressure,there is no need to consider the effect of slippage for the low-permeability gas reservoirs.Second,the starting pressure gradient,being inverse proportion to the permeability,exists in the seepage of low-permeability gas reservoirs,Third,the occurrence of the high-speed non-Darcy flow effect is with the critical permeability value.Fourth,water saturation has a great impact on the flow characteristics of low-permeability gas reservoirs.These conclusions have directive significance for the development of low-permeability sandstone gas reservoirs.

关 键 词：低渗透气藏 滑脱效应 启动压力 非达西流 含水饱和度 实验 现状 认识 

分 类 号：TE311[石油与天然气工程—油气田开发工程]