摘要
渤海地区地层压力与饱和压力压差小的窄河道油田已进入中高含水阶段,产量递减快、稳产难度大,提液为有效的增产措施。但窄河道油藏的流体渗流方式受河道边界的影响较大,提液过程中极易脱气,所以合理的提液幅度难以确定。基于考虑河道边界影响的窄河道流体渗流方程,确定了不同含水阶段的比采液指数;根据考虑气相的IPR曲线,确定了不同地层压力下的合理生产压差;结合比采液指数及合理生产压差,确定了该类型油藏在不同地层压力下不同含水阶段的合理提液幅度。应用该方法确定实际油藏提液能力,取得了很好的增油效果,为海上该类型油藏提液提供了理论依据和生产经验。
The narrow channel oil reservoirs in Bohai area under small difference between formation and bubble point pressure have entered the stage of medium and high water cut, with rapid production decline and great difficulty in stable yield, while the big-pump enhanced liquid technique is an effective stimulation method. However, it is difficult to determine the reasonable enhanced liquid amplitude because the flow characteristics of narrow channel reservoir is different from the complete-structure reservoirs and it is easy to degas for small difference between the formation and bubble point pressure. Based on the flow percolation equation of narrow channel considering the influence of river boundary, the specific liquid recovery indexes of different water-cut stages were determined. According to IPR curve of gas phase, the reasonable production pressure difference under different formation pressure is determined. Combined with the specific liquid recovery index and reasonable production pressure difference, the reasonable liquid extraction range of this type oil reservoir at different water cut stages under different formation pressure was determined. This method is applied to field test which has resulted in good effects of increasing production and can provide theoretical guidance and production experiences for offshore narrow channel reservoirs.
出处
《石油地质与工程》
CAS
2018年第5期76-78,共3页
Petroleum Geology and Engineering
基金
国家科技重大专项"海上油田丛式井网整体加密及综合调整油藏工程技术研究"(2011ZX05024-004)
关键词
窄河道油藏
BZ油田
低地饱压差
提液幅度
narrow channel reservoir
BZ oilfield
small difference between reservoir and bubble point pressure
enhanced liquid amplitude
