摘要
传统的连通性研究方法在连通性认识深度上不足,主要依据地质、地震、动态、测试和数理统计等手段,定性描述连通性,还没有一种能够三维定量表征连通性的技术方法。本文利用CT扫描实验将岩心数字化,识别微观孔隙结构参数,基于低渗油藏非线性渗流规律分析了微元体的启动压力梯度,建立了岩心连通孔道比例与压力梯度的函数关系,实现了连通性的定量表征。利用CT扫描实验构建的函数关系,提出了考虑非线性渗流规律的油藏数值模拟连通场计算方法,可将油藏任意时刻的压力场转化为连通场,进一步实现了连通性的三维表征。根据计算的连通孔道比例,拟定了连通场分类评价标准,实现了油藏连通性的空间评价。低渗油藏连通场的建立,实现了连通性的三维定量表征,可以分析油田在任何开发阶段的油藏连通孔道空间分布特征,指导油田开展注采井网调整和生产工作制度优化等工作,提高低渗油藏注水开发效果。
The traditional connectivity research methods are insufficient in the depth of connectivity knowledge, based on geology,seismology, dynamics, testing and mathematical statistics, connectivity is described qualitatively.There is no technical method that can quantitatively represent connectivity in three dimensions.In this paper,CT scanning experiment is used to digitize core and identify micro pore structure parameters. Based on the non-linear seepage law of low permeability reservoir, the starting pressure gradient of micro element is analyzed, and the functional relationship between the ratio of core connected channels and the pressure gradient is established. Then the quantitative characterization of connectivity is realized. Based on the function relation constructed by CT scanning experiment, a method of calculating the connected field of reservoir numerical simulation considering the non-linear seepage law is proposed, which can transform the pressure field of reservoir at any time into the connected field,and further realize the three-dimensional characterization of the connectivity. According to the calculated ratio of connected channels, the classification and evaluation criteria of connected fields are formulated, and the spatial evaluation of reservoir connectivity is realized. The establishment of connecting field in low permeability reservoir,which has realized the three-dimensional quantitative characterization of connectivity.It can analyze the spatial distribution characteristics of connectivity channels in any development stage, guide the oilfield to carry out the adjustment of injection production well pattern and optimization of production system, and improve the water injection development effect of low permeability reservoir.
作者
李凤颖
雷霄
张乔良
查玉强
孙胜新
LI Fengying;LEI Xiao;ZHANG Qiaoliang;ZHA Yuqiang;SUN Shengxin(Research Institute of Zhanjiang Branch,CNOOC China Ltd.,Zhanjiang Guangdong 524057,China)
出处
《石油化工应用》
CAS
2019年第12期74-81,88,共9页
Petrochemical Industry Application
基金
中国海洋石油公司重大专项“海上在生产油气田挖潜增效技术研究”部分研究成果，项目编号：CNOOC-KJ125ZDXM06LTD03ZJ12
关键词
连通性
CT扫描
低渗油藏
非线性渗流
油藏数值模拟
connectivity
CT scan
low permeability reservoir
non-linear seepage
reservoir numerical simulation
