摘要
针对断溶体油藏地质特征复杂、准确快速模拟难以实现的问题,以储层静态物性参数和动态注采数据为基础,将复杂的断溶体结构离散为井—缝—洞间的一维连通单元。提出了能够表征井间连通特性及物质基础的两个特征参数:传导率和控制体积。同时,引入流体高速非达西渗流项来描述断溶体内真实渗流特征,建立了断溶体油藏井—缝—洞间的连通单元物质平衡方程,实现了断溶体油藏油水动态模拟。研究结果表明:定液制度下,非达西渗流系数β=0,传导率值不变;β>0,随β值增大,连通单元内传导率下降程度增大,水相受非达西作用影响更明显,导致油井见水时间滞后,地层压力及井底流压下降,所需生产压差增加。针对Z断裂带,在达西渗流条件下,各计算指标与实际值难以拟合;当β取值在10^(3)~10^(4)时,单井流压及区块产油拟合效果理想,更符合实际流动。高速非达西作用明显的单元内连通性更好,对井间连通性准确预测具有指导意义。
To address the problems caused by the complex geological characteristics of fault-karst reservoir and difficult to be solved by accurate and fast simulation,the complex fault-karst structure was discretized into a one-dimensional connected unitamong well,fracture and vugbased on the static physical parameters of reservoirs and the dynamic injection and extraction data.Two characteristic parameters,i.e.,conductivity and control volume,were proposed to characterize the inter-well connectivity properties and material basis.Meanwhile,this paper introduces the high-speed non-Darcy flow term to describe the characteristics of real flow in the fracture body,sets up the material balance equation of the well-fracture-vug interconnection unit in fault-karst reservoirs,and realizes the simulation of oil-water dynamics in fault-karst reservoirs.The results research show that under the constant fluid regime,when the non-Darcy flow coefficient β=0,the conductivity value remains unchanged;when β>0,with the increasing of β value,the conductivity decline in the connected unit increases,and the water phase is more obviously affected by the non-Darcy effect,which leads to the lag time of water occurrence in the well,the decrease of formation pressure and bottom flow pressure,and the increase of the required production pressure difference.For the Z fracture zone,it is difficult toperform the fitting between the calculation indexes and the actual values under the Darcy flow conditions;whenβis set to be 10^(3)-10^(4),the single well flow pressure is well fitted with the block oil production,and are more in line with the actual flow.The connectivity is even better in the unit with obvious high-speed non-Darcy effect,providing a guidance for accurate prediction of inter-well connectivity.
作者
赵辉
李伯英
周玉辉
张琪
刘洪发
王文才
王晓龙
Zhao Hui;Li Boying;Zhou Yuhui;Zhang Qi;Liu Hongfa;Wang Wencai;Wang Xiaolong(College of Petroleum Engineering,Yangtze University,Hubei Wuhan 430100,China;Key Laboratory of Drilling and Production Engineering for Oil and Gas,Hubei Province,Hubei Wuhan 430100,China;School of Earth Resources,China University of Geosciences,Hubei Wuhan 430100,China;The Fourth Oil Production Plant,Sinopec Northwest Oilfield Company,Xinjiang Aksu 830000,China)
出处
《石油学报》
EI
CAS
CSCD
北大核心
2022年第7期1026-1034,共9页
Acta Petrolei Sinica
基金
国家科技重大专项“缝洞性油藏辅助历史拟合及生产优化软件研究”(2016ZX05014-003-007)
国家自然科学基金项目“基于连通性思想的碳酸岩盐油藏生产优化研究”(No.51674039)资助。
关键词
断溶体油藏
井间连通性
高速非达西渗流
敏感性分析
预测
fault-karst reservoir
inter-well connectivity
high-speed non-Darcy flow
sensitivity analysis
prediction
