高温高压致密砂岩储集层气水相渗曲线测试方法  

Gas-water relative permeability measurement of high temperature and high pressure tight gas reservoirs

作　　者：方建龙[1] 郭平[1] 肖香姣[2] 杜建芬[1] 董超[1] 熊燏铭 龙芳[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) [2]中国石油塔里木油田公司

出　　处：《石油勘探与开发》2015年第1期84-87,共4页Petroleum Exploration and Development

基　　金：国家油气重大专项"塔里木盆地库车前陆冲断带油气开发示范工程"(2011ZX05046)

摘　　要：致密气气水相渗曲线一般在常温常压下应用非稳态气水相渗测试方法通过实验测得,所得结果与高温高压下气水相渗曲线相差很大。采用常规标准方法,用氮气和地层水测试3块岩心在常温常压下的气驱水相渗曲线,之后将3块岩心按照实验流程处理,采用自研全直径渗流装置(200℃,200 MPa)对这3块岩心在地层条件下(温度160℃,116 MPa)进行气驱水相渗曲线测试。结果表明,高温高压相渗曲线具有更大的两相共渗区,且束缚水饱和度更低;在相同含气饱和度下,高温高压气相相对渗透率比常温常压的高,说明地层条件下致密气气水两相的渗流能力更强,实际束缚水含量更低。高温高压下,气水黏度比、密度比以及界面张力更低,气驱水波及效率更高。Generally, gas-water relative permeability curves of tight gas reservoirs are obtained from unsteady experiment under room temperature and normal pressure, which greatly differs from the curves under high temperature and high pressure. In this research, the relative permeability curves of three cores were firstly measured using conventional standard method by displacing formation water with nitrogen under room temperature and normal pressure. Then the relative permeability curves of the same cores were measured by displacing formation water with natural gas on one self-developed full-diameter seepage flow equipment （200 ~C, 200 MPa） under reservoir conditions （160 ~C, 116 MPa） after several processing of the cores. Difference between the relative permeability curves obtained by the two methods shows that, under high temperature and high pressure, there exists a larger two-phase seepage zone and lower irreducible water saturation. At the same gas saturation, gas relative permeability under high temperature and high pressure is higher than that under room temperature and normal pressure, which means, under reservoir situation, the two-phase flow ability of gas and water is stronger and the irreducible water saturation is lower in tight gas reservoirs. The gas-water viscosity ratio, gas-water density ratio and interfacial tension are lower under this situation, which leads to higher sweep efficiency.

关 键 词：高温 高压 致密气藏 非稳态 气水相渗曲线 全直径岩心 

分 类 号：TE37[石油与天然气工程—油气田开发工程]