海上疏松砂岩油藏水驱油效率影响因素研究及应用——以NNX油田为例  

Influencing factors of water flooding efficiency in offshore unconsolidated sandstone reservoir and its application--by taking NNX oilfield as an example

作　　者：罗宪波 李金宜 何逸凡 靳心伟 LUO Xianbo;LI Jinyi;HE Yifan;JIN Xinwei(Bohai Petroleum Research Institute,Tianjin Company of CNOOC(China)Co.,Ltd.,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300459

出　　处：《石油地质与工程》2021年第1期61-65,共5页Petroleum Geology and Engineering

基　　金：国家科技重大专项“渤海油田加密调整油藏工程技术研究”(2016ZX05025–001–007)。

摘　　要：高驱替倍数水驱研究已成为高含水期剩余油挖潜的热点方向,以渤海油田典型疏松砂岩主力油藏为例,利用典型疏松砂岩主力油藏天然岩心设计并完成500~2000 PV高倍数水驱油效率室内实验,研究主力油藏储层水驱油效率的主控因素。结果表明,空气渗透率越低,原油黏度越大,驱油效率越小;驱油效率与流度近似呈现幂指数关系;在储层流度近似情况下,黏土矿物的存在对驱油效率影响较大,黏土矿物含量越低,驱油效率越高。通过深化对水驱油效率的认识,指导现场先后实施大幅度提液措施,增强水体对储层冲刷倍数,使该油田在高含水期长期持续稳产,且在童宪章曲线图版上采收率预测持续向好,为渤海油田陆相疏松砂岩油藏高含水期挖潜研究提供实验和理论支持。The research related with high displacement multiple water flooding has become a hot direction for tapping the potential of remaining oil in high water cut stage.By taking the typical unconsolidated sandstone reservoir in Bohai oilfield as an example,the laboratory experiment of 500~2000 PV high multiple water displacement efficiency is designed and completed by using the natural core of typical unconsolidated sandstone main reservoir,and main influencing factors of water displacement efficiency are studied.The results indicate the lower the air permeability,the higher the crude oil viscosity and the lower the oil displacement efficiency;the displacement efficiency and mobility display the relationship of power exponent;when the reservoir fluidity is approximate,the existence of clay minerals will have a great impact on oil displacement efficiency,and the lower the clay mineral content,the higher the oil displacement efficiency.Through deepening understanding of water flooding efficiency,large-scale liquid extraction measures have been implemented and the scouring multiple of water body on reservoir has been strengthened,which makes the oilfield realize a long–term and stable production in high water cut stage.And the oil recovery prediction on Tong chart board is good,which provides experimental and theoretical support for the research on tapping potential of continental unconsolidated sandstone reservoir in Bohai oilfield in high water cut period.

关 键 词：疏松砂岩 高倍数水驱 实验设计 驱油效率 影响因素 

分 类 号：TE341[石油与天然气工程—油气田开发工程]