摘要
南堡凹陷柳赞北区古近系沙三;亚段(Es;)油藏构造完整,上覆稳定区域盖层,圈闭密封性好;地层倾角大,储层连通性好,有利于形成重力驱。气驱实验表明,天然气具有增溶膨胀能力、有效降低原油黏度、增大原油流动性特点,可大幅提高采收率。基于柳北油藏地质条件,开展天然气重力驱提高采收率关键技术政策研究。结果表明:高注低采交错注采井网,水平井与定向井结合,注采高差100~120m,注采井距100~150m,可有效动用油层顶部、构造高部位剩余油。围绕提高波及体积及驱油效率,将开发划分为温和注气采油、强化注气采油、注水采气增效3个阶段,分别优化开发方式、注采方式、注气速度、采液速度、压力保持水平、转阶段时机等关键参数。通过构建天然气重力驱提高采收率新模式,探索水驱开发油藏高含水开发后期可持续发展技术路径,对渤海湾地区同类型油藏开发具有借鉴意义。
The Es;Reservoir in northern Liuzan Block of Nanpu Sag is complete in structure, stable in overlying mudstone stratum and good for trap sealing. The reservoir is favorable for gravity drive thanks to its large formation dip angle and good conductivity. The gas drive test indicates that natural gas is able for solubilization and expansion, effective reduction of crude oil viscosity, and increase of crude oil fluidity. Therefore, it can substantially improve the productivity. Based on the geological conditions of the reservoir in northern Liuzan, the study was carried out to focus on the key technology policy of natural gas gravity drive for EOR. The results indicated that the well pattern with alternation of high injection and low production, combination of horizontal wells with directional wells, the difference in the injection-production height between 100 meters and 120 meters and the injection-production well spacing between 100 meters and 150 meters can effectively produce the remaining oil in the top of oil formation and in the high position of the structure. Focusing on sweep volume and displacement efficiency, oil development was divided into three stages – mild gas injection for oil production, enhanced gas injection for oil production and water injection and gas production for higher efficiency – to optimize the key parameters of the development method, the injection-production method, the gas injection speed, the liquid production speed,the pressure-maintaining level, and the time for conversion of the stages. Based on the new model of natural gas gravity drive for EOR,the study of the technology path for water-drive development of oil reservoir during its later high water-cut period to keep sustainable development is of great significance to the oil reservoirs of the same type in the Bohai Bay Basin.
作者
乔石石
耿文爽
张雪娜
谭静
Qiao Shishi;Geng Wenshuang;Zhang Xuena;Tan Jing(Exploration and Development Research Institute,PetroChina Jidong Oilfield Company,Tangshan 063004,China;China Oilfield Services Limited,Tianjin 300450,China)
出处
《石油科技论坛》
2022年第2期32-38,52,共8页
PETROLEUM SCIENCE AND TECHNOLOGY FORUM
基金
中国石油冀东油田公司重大项目“冀东油田提高采收率潜力评价与总体规划研究”(编号:KF2018A03)。
