沥青质沉积对轻质油藏CO_2驱的影响  

Effect of Asphalt Deposition on CO_2 Flooding in Light Oil Reservoir

作　　者：陈龙龙 余华贵 汤瑞佳 王维波 姚振杰 

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710075

出　　处：《油田化学》2017年第1期87-91,共5页Oilfield Chemistry

基　　金：国家科技支撑计划项目"陕北煤化工CO2捕集;埋存与提高采收率技术示范"(项目编号2012BAC26B00)

摘　　要：为了解沥青质沉积对轻质油藏CO_2驱的影响,以CO_2及延长轻质原油为介质,在不同压力、不同CO_2与原油物质的量比的实验参数下,研究了CO_2对沥青质的沉积规律以及沥青质沉积对油水界面性质、原油组成、储层渗透率及采收率的影响。研究结果表明:当压力从0 Pa升至20 Pa时,沥青质沉积量从0.17%增至6.27%;沥青质沉积导致的储层渗透率损害程度从1.87%增至13.64%,油水界面张力原来的2.40 mN/m增至16.80 mN/m。压力在25 MPa时原油采收率最大,达到11.83%。In order to study the effect of asphalt deposition on CO2 flooding in light oil reservoir, based on the indoor experiment method, the CO2 and light crude oil from Yanchang oilfleld was used to study the effect of CO2 on the regularity of asphaltene deposition, and effect of asphaltene deposition on characteristics of oil-water interface, crude oil composition, reservoir permeability and oil recovery under different pressure and different molar ratio of CO2-crude oil. The experiment results showed that when the pressure of the CO2 injection was increased from 0 Pa to 20 Pa, the amount of asphaltene deposition increased from 0.17% to 6.27%, which leaded to a increase of the reservoir permeability damage from 1.87% to 13.64%, and oil/water interfacial tension increased from 2.40 mN/m to 16.80 mN/m. Oil recovery reached to maximum when the oressure was of 25 MPa, beine of 11.83%.

关 键 词：CO2驱 沥青质沉积 轻质油藏 原油采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]