摘要
东濮老区注水开发近40 a,已进入高含水剩余油高度分散阶段,因此需明确不同渗透率储层高通量水洗后微观动用规律及机理,以指导高含水油田开发策略调整。文中综合高通量水洗油岩心实验、微流控实验及微观流动模拟,明确了不同渗透率储层高含水阶段的驱替特征,揭示了高通量水洗中剩余油的微观赋存状态及动用机理。结果表明:渗透率大于50×10^(-3)μm^(2)的储层在高通量水洗阶段(岩心尺度30~1000 PV)驱油效率可进一步提高7.50百分点以上,微观波及范围变化不大,主要通过水力冲刷、润湿剥离动用水驱流线控制孔喉内的膜状、滴状等剩余油类型;而对于渗透率低于50×10^(-3)μm^(2)的储层,受孔喉尺寸以及连通性的影响,进入高含水阶段水驱微观波及范围有限,高通量水洗难以有效动用剩余油,宜在主流线达30~50 PV时转变注水开发方式。
The Dongpu mature region has been developed by water flooding for nearly 40 years,entering high water cut stage,and the remaining oil is extremely dispersed.It is necessary to clarify the micro production laws and mechanisms of reservoirs with dfferent permeabilities after high-flux water washing in order to guide the development strategy adjustment of high water cut oilfields.In this research,high-flux water washing core experiments,microfluidic experiments and microscopic flow simulation were conducted to clarify the displacement characteristics of high water cut stage in reservoirs with different permeabilities,and reveal the occurrence state and production mechanism of remaining oil during high-flux water washing process.The results show that:the displacement efficiency of reservoirs with permeability greater than 50×10^(-3)μm^(2)can be further improved more than 7.5 percentage points during the high-flux water washing stage(30~1000 PV in core scale),but the micro sweep range changes little.The membrane-shaped and drop-shaped remaining oil in pore throats are mainly controlled by the water flooding streamline produced by hydraulic erosion and wetting stripping.However,for reservoirs with permeability below 50×10^(-3)μm^(2),the water flooding micro sweep range in the high water cut stage is limited due to the influence of pore-throat size and connectivity.The remaining oil is dificult to be further utilized through high-flux water washing,and it is advisable to change the water-injection development method when the mainstream reaches 30 PV to 50 PV.
作者
罗波波
燕高飞
谢敏
郭立强
蒲保彪
陈道远
齐桂雪
杨祖贵
张昀徽
LUO Bobo;YAN Gaofei;XIE Min;GUO Liqiang;PU Baobiao;CHEN Daoyuan;QI Guixue;YANG Zugui;ZHANG Yunhui(Exploration and Development Research Institute,Zhongyuan Oilfield Company,SINOPEC,Puyang 457001,China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102200,China)
出处
《断块油气田》
北大核心
2025年第1期147-152,共6页
Fault-Block Oil & Gas Field
关键词
高通量水洗
岩心驱替实验
微流控实验
孔隙尺度
微观剩余油
赋存机理
high-flux water washing
core displacement experiments
microfluidic experiments
pore-scale
microscopic remaining oil
occurrence mechanism
