油气地质与采收率2012，Vol.19Issue(3)：67-70,4.
低渗透油藏二氧化碳混相驱油机理数值模拟
Numerical simulation of CO2 miscible flooding in low-permeability oil reservoir
摘要
Abstract
CO2 miscible flooding is a important oil recovery enhancing measure, but the studies on the mechanism of C02 miscible flooding are mostly limited in laboratory now, the mechanism and influencing elements of CO2 miscible flooding are not well understood systematically so far, therefore, the numerical simulation is used in Hei59 block of Daqingzi oilfield which selected as the pilot area to study the mechanism, at the same time, water-injection and C02 -injection is studied comparatively. As the result, the oil recovery enhancing mechanism of CO2 miscible flooding is that the CO2 gas is dissolve into rude oil to improve the fluid mobility and exchange ingredients with oil phase until they reach miscibility status in order to improve oil displacement efficiency considerably, and the individual well producing rate through CO2 driving is about two times than that through water driving, and the ultimate recovery can by increased by above 14% through CO2 driving than water driving, and the study can provide valuable theoretical instruction for CO2 miscible flooding in this reservoir and other similar oil fields and can provide important proofs for practical projects. After the CO2 miscible flooding project was executed in Hei59 block of Daqingzi oilfield, the individual well producing rate reached 10.2 t/d, 2.4 times that that through water driving, and the water cut is declined by 23.2% , the practical production status accords well with theoretical studying.关键词
二氧化碳混相驱/驱油机理/低渗透油藏/油藏数值模拟/大情字油田Key words
C02 miscible flooding/ oil displacement mechanism/ low - permeability reservoir/ reservoir numerical simulation/ Daqingzi oilfield分类
能源科技引用本文复制引用
吴忠宝,甘俊奇,曾倩..低渗透油藏二氧化碳混相驱油机理数值模拟[J].油气地质与采收率,2012,19(3):67-70,4.基金项目
中国石油天然气股份有限公司科技重大专项03号课题“吉林大情字油田含CO2天然气开发及CO2埋存”(2007D-1503-03). （2007D-1503-03）
