残余水状态下低渗储层气体低速渗流机理  

GAS PERCOLATION MECHANISM OF LOW PERMEABILITY RESERVOIRS WITH LOW SPEED UNDER RESIDUAL WATER CONDITIONS

作　　者：周克明[1] 李宁[1] 袁小玲[1] 

机构地区：[1]中国石油西南油气田分公司勘探开发研究院

出　　处：《天然气工业》2003年第6期103-106,共4页Natural Gas Industry

摘　　要：文章利用低速渗流实验装置 ,在残余水状态下 ,对亲水低渗储层岩石中气体低速渗流机理进行了大量的实验研究。研究成果表明 :在残余水状态下 ,亲水低渗储层岩石中的气体低速渗流具有明显的非达西渗流特征 ;在克氏回归曲线上 ,存在着界定不同渗流机理影响的临界点。在临界点以下 ,气体渗流受毛细管阻力影响 ,表现为气体有效渗透率随净压力增大而递增 ;临界点以上 ,气体渗流受气体分子滑脱效应影响 ,表现为气体有效渗透率随净压力增大而递减。Using experimental facilities of low speed percolation under residual water conditions, a lot of experiments was conducted for gas percolation mechanism with low speed in water-wet low permeability reservoirs. The results show that under residual water conditions gas percolation with low speed in water-wet low permeability reservoirs has obvious characteristics of non-Darcy flow. There are critical points to distinguish different percolation mechanism on Klinkenberg regression line. Below the critical points, capillary resistance affects gas percolation, appearing the gas effective permeability increases as the net pressure increases. Above the critical points, gas percolation is affected by slippage effect of gas molecule, appearing the gas effective permeability decreases as the net pressure increases. The critical pressure reflects the influence of the two different mechanisms caused by capillary resistance and slippage effect of gas molecule on gas percolation with low speed.

关 键 词：低渗透油气藏 储集层 气体低速渗流机理 残余水状态 油气田开发 

分 类 号：TE311[石油与天然气工程—油气田开发工程]