储层压力条件下低渗砂岩气藏气体渗流特征  

Percolation characteristics of gas in sandstone gas reservoir with low permeability under reservoir pressure

作　　者：叶礼友[1] 高树生[1,2] 熊伟[1,2] 朱光亚[1,2] 胡志明[1,2] 

机构地区：[1]中国科学院渗流流体力学研究所,河北廊坊065007 [2]中国石油天然气股份有限公司勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《复杂油气藏》2011年第1期59-62,共4页Complex Hydrocarbon Reservoirs

基　　金：国家科技支撑计划(2006BAB03B03)资助

摘　　要：针对低渗砂岩气藏开展了储层压力条件下的气体渗流特征理论和实验研究,包括研究滑脱效应的定压差高压渗流实验和研究高速非达西流现象的定回压高压渗流实验。研究结果表明:低渗砂岩气藏储层中气体渗流的滑脱效应可以忽略不计;实验气测岩样绝对渗透率时,应用加回压提高平均压力的实验方法测得的绝对渗透率更为准确;压力梯度达到一定的临界值后,低渗砂岩岩样中出现非达西流,这表明在低渗储层中压力梯度很大的区域,如近井地带,存在非达西流,且储层渗透率越高,出现非达西流的临界压力梯度越低,非达西流现象越明显。Theory analysis and experiments have been done to study on percolation characteristics of gas in sandstone gas reservoir with low-permeability under reservoir pressure,including gas slippage effect and the phenomenon of high-speed non-Darcy flow.The experimental results show that the gas slippage effect of low-permeable reservoirs can be neglected;when absolute permeability of rock samples were measured by gas,the data,which were measured under the increased average pressure by adding back pressure,is more accurate.After pressure gradient reaches a certain critical value,non-Darcy flow can be observed.This indicates that in the area with high pressure gradient,such as the near wellbore area,non-Darcy flow exsites.And the higher the permeability is,the lower the ctitical presure gradient is,and the more obvious the non-Darcy flow phenomenon is.

关 键 词：低渗透砂岩气藏 高压渗流特征 滑脱效应 

分 类 号：TE312[石油与天然气工程—油气田开发工程]