摘要
应用数值模拟方法 ,计算了低渗透油田压裂前后水驱和溶解气驱的采出程度 ;分析了溶解气油体积比、饱和压力、井底流压、裂缝方位、缝长、裂缝渗透率对开发效果的影响 .结果表明 :油田开采时间越长 ,溶解气油体积比越大 ,采出程度越高 ;而流压、油层饱和压力高低都会影响采出程度 ;当裂缝方位与井位成 45°角时 ,无论水驱还是溶解气驱 ,采出程度均提高 ,压裂后的开发效果好于压裂前 ;当人工裂缝与井位平行时 ,随着油层渗透率增大 ,气驱的采出程度增大 ,而水驱采出程度降低 .
By means of numerical simulative method, recovery percentage of water drive and dissolved gas drive is calculated in the low-permeability oil field before and after fracturing. And we study many factors which affect the development, such as solution gas-oil ratio, saturation pressure, producing bottom-hole pressure, fracture azimuth, fracture length and fracture permeability. Result shows that the development effect of the low-permeability reservoirs before fracturing is mainly subject to solution gas-oil ratio, saturation pressure and producing bottom-hole pressure change. The longer the production time of oil field, the higher the solution gas-oil ratio and the oil recovery. While the producing bottom-hole pressure is too high or too low, oil recovery will be reduced. When the angle between fracture azimuth and well array is 45 for both water-flooding and dissolved gas drive, the recovery percentage is enhanced and the development effect after fracturing is better than that before fracturing. When the angle is 0°, the recovery percentage will be reduced as the permeability is increased.
出处
《大庆石油学院学报》
CAS
北大核心
2002年第2期15-17,共3页
Journal of Daqing Petroleum Institute
基金
中国石油天然气集团公司科技攻关项目 ( 0 10 5 14 -0 5 )
关键词
低渗透油藏
压裂
驱动方式
开发效果
采出程度
low permeability reservoir
development effect
drive manner
fracture
recovery percent
