摘要
王窑油田低渗透油藏开发多采用正方形反九点井网,2009年在其西部开展了井网加密调整试验。为了评价试验区井网加密调整提高采收率的潜力,进行了正方形反九点井网加密调整物理模拟。针对试验区地质特征,通过对比孔隙度、渗透率、驱油效率和孔喉半径等参数,选取与其物性相近的天然砂岩露头,采用树脂封装制作大尺度物理模型开展水驱油实验。根据试验区实际加密调整时机和方式,在水驱油实验过程中进行加密转注调整模拟,研究井网加密调整对开发效果的影响。实验结果表明,试验区经井网加密调整后,提高采收率幅度约为4.97%,若井网加密调整时机晚5 a,提高采收率幅度则降低1.24%。因此,试验区所在区块应尽早实施井网加密调整。
The square inverted nine-spot pattern is widely used in Wangyao low permeability oilfield, and the infilling pilot is carriedout in the west part. In order to evaluate the EOR potential of pattern infilling program, the infilling inverted nine-spot pattern physicalsimulation program is designed. Considering the geological features of pilot area, the natural sandstone outcrops are selected, whichhave the similar porosity, permeability, oil displacement efficiency and throat radius for the waterflooding experiment. According to theactual timing and manner of infilling adjustment of the pilot area, we simulate the infilling injection during the experiment to study theimpact of infilling adjustment on development performance. Results show that, after infilling adjustment, the EOR is increased by about4.94%. If the infilling timing is postponed for five years, the EOR might reduce by 1.2%. Therefore, the infilling adjustment should beimplementedassoon aspossible in the pilot area.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2014年第3期89-91,117,共3页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"低渗
特低渗油藏开发技术界限研究"(2008ZX05013-003)
关键词
低渗透油藏
正方形反九点井网
井网加密
物理模拟
王窑油田
lowpermeability reservoirs
square inverted nine-spot pattern
well patterninfilling
physical simulation
waterflooding
