低渗油藏CO_2/原油及N_2/原油间油气相渗实验  

EXPERIMENTS ON CO_2/OIL AND N_2/OIL RELATIVE PERMEABILITY CURVES FOR LOW PERMEABILITY RESERVOIRS

作　　者：王锐[1,2] 吕成远[1,2] 伦增珉[1,2] 赵淑霞[1,2] 王海涛[1,2] 

机构地区：[1]中国石油化工集团公司海相油气藏开发重点实验室,北京100083 [2]中国石化石油勘探开发研究院采收率所,北京100083

出　　处：《大庆石油地质与开发》2015年第6期114-117,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家(863)项目"二氧化碳提高石油采收率与封存关键技术研究"(2009AA063406)

摘　　要：CO_2驱以其良好的注入性和驱油效果成为低渗透油藏有效提高采收率方法。油气相渗曲线是研究CO_2驱油效果的关键参数。通过非稳态油气相渗实验及JBN方法,分别进行了CO_2/原油、N_2/原油的油气相对渗透率实验,并从气测渗透率、黏度、界面张力等分析了2种气体相渗曲线的差异。研究结果表明:CO_2驱过程中的油气相渗曲线的两相共渗区要明显宽于N_2驱,且残余油饱和度小于N_2驱;随着含气饱和度的升高和含油饱和度的降低,CO_2与N_2的油相相渗比值急剧增大,气相相渗比值缓慢上升;相比于N_2,CO_2气测渗透率较大、黏度和油气界面张力较低,低渗透油藏中CO_2的渗流能力强于N_2。Due to the better injectivity and displacement effects, CO2 flooding has become one of the effective EOR methods for low-permeability reservoirs. Oil-gas relative permeability curve is the crucial parameter to evaluate the effects. With the help of unsteady oil-gas relative permeability and JBN method, the experiments on CO2/oil and N2/oil relative permeability are made to analyze the difference between the two gases in the relative permeability curves from the perspectives of the gas-measured permeability, viscosity, interfacial tension and so on. The results show that two-phase co-flow zone of the CO2 flooding is wider than that of N2 flooding, and moreover the resid- ual oil saturation of the CO2 flooding is pretty less ; with the rise of the gas saturation and drop of the oil saturation, the oil-phase permeability ratios of the CO2 and N2 increase rapidly, while the one of the gas phase rises slowly; comparing with the N2 , the gas-measured permeability of the CO2 is rather bigger, the viscosity and interracial tension are pretty lower, so the CO2 flow is much better than that of the N2 in low-permeability oil reservoirs.

关 键 词：CO2 N2 油气相渗 渗透率 界面张力 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]