摘要
高含水油藏在长期的注水冲刷过程中,储层渗透率会发生变化,传统冲刷程度表征参数在描述储层渗透率时变规律时并未考虑临界流速的影响。为此,提出有效累计水相通量的概念,利用临界流速作为微粒开始运移的速度界限,从而在一定程度上修正了水相通量对储层渗透率的影响。通过实验获取储层渗透率随有效累计水相通量变化的岭型演化模型,并将其与三维两相油水渗流方程耦合,建立基于有效累计水相通量的储层渗透率时变流动模型。研究结果表明:贝雷岩心在长期的注水冲刷作用下,即使在较低的驱替速度下渗透率也发生了较大变化,高倍数水驱下的临界流速(0.006 cm/s)要比常规条件下的(0.015cm/s)更低。考虑临界流速的有效累计水相通量在表征储层渗透率的时变规律时,复杂河流相油藏模型水驱数值模拟结果更加符合微观下微粒运移引起的储层渗透率时变特征。因此,有效累计水相通量能够较好地描述临界流速影响下的储层渗透率时变规律。
The permeability of high water-cut reservoirs will change during long-term water flooding.The traditional parameters characterizing water flooding do not consider the influence of critical flow velocity when describing the time variation law of reservoir permeability.Therefore,the concept of effective cumulative water flux was put forward,and the critical flow velocity was used as the velocity limit of particle migration to correct the influence of water flux on reservoir permeability to a certain extent.The ridge evolution model of reservoir permeability changing with effective cumulative water flux was obtained by experiments and coupled with the three-dimensional two-phase oil-water flow equation.As a result,a time variation reservoir permeability flow model based on effective cumulative water flux was established.The results show that the permeability of the Berea core changes greatly even at a low displacement rate under long-term water flooding,and the critical flow velocity under high multiple water flooding(0.006 cm/s)is lower than that under normal conditions(0.015 cm/s).By considering the effective cumulative water flux of critical flow velocity to characterize the time variation characteristics of reservoir permeability,the numerical simulation results of complex fluvial reservoir models are more consistent with the time variation characteristics of reservoir permeability caused by microparticle migration.Therefore,the effective cumulative water flux can better describe the time variation law of reservoir permeability under the influence of critical flow velocity.
作者
张瑞
王涛
王飞
朱旭晨
王艳红
寇双燕
王敬
ZHANG Rui;WANG Tao;WANG Fei;ZHU Xuchen;WANG Yanhong;KOU Shuangyan;WANG Jing(National Key Laboratory of Offshore Oil and Gas Exploitation,Beijing City,102209,China;Oilfield Production Research Institute of China Oilfield Services Ltd.,Tianjin City,300459,China)
出处
《油气地质与采收率》
北大核心
2025年第1期162-173,共12页
Petroleum Geology and Recovery Efficiency
关键词
高含水油藏
有效累计水相通量
渗透率时变
临界流速
数值模拟
high water-cut reservoir
effective cumulative water flux
time variation permeability
critical flow velocity
numerical simulation
