基于传质扩散理论的高渗油藏窜流通道量化方法

发布时间：2018-11-12 09:55

【摘要】：海上高渗砂岩油藏胶结疏松,注入水冲刷作用对储层改造作用明显,其窜流通道在平面上呈"纺锤形",垂向上有明显"贼层"特征。目前窜流通道的时间域、空间域连续量化方法存在数学模型和求解过程过于复杂的缺陷。考虑窜流通道平面、垂向特征,建立降维方法,将高渗油藏注采井间窜流通道三维物理模型变为平面和剖面两个二维物理模型的叠加;根据注入水在平面上纺锤形分布和注入化学剂浓度分布的相似性,及注水倍数、含水饱和度和渗透率变化倍数的单调相关性,提出了基于"饱和度差异"的"等效扩散系数"概念,建立了包含产出端含水率的平面数学模型;针对"贼层"是无效水循环主要通道的特征,定义了稀释倍数,实现了产出端含水率的解析求解,建立了窜流通道厚度、渗透率级差和等效扩散系数的快速量化方法。矿场算例应用结果显示,暴性水淹井和快速水淹井窜流通道厚度分别为0.04 m、0.38 m,渗透率级差分别为22、8,和示踪剂解释结果吻合;解释得到的等效扩散系数同时表征了储层微观非均质性和油水黏度比导致的指进程度及窜流通道波及面积的大小。
[Abstract]:The cementation of high permeability sandstone reservoir at sea is loose, the effect of injection water scour on reservoir reconstruction is obvious, the channeling channel is "spindle-shaped" on the plane, and the vertical direction has obvious characteristics of "thief layer". At present, the continuous quantization method in time domain and space domain of channeling channel has the defects of too complicated mathematical model and solving process. Considering the plane and vertical characteristics of channeling flow channel, a dimensionality reduction method is established to transform the three-dimensional physical model of channeling flow channel between injection-production wells in high permeability reservoir into the superposition of two two-dimensional physical models of plane and section. According to the similarity between the spindle-shaped distribution of injected water on the plane and the concentration distribution of injected chemicals, and the monotone correlation of water injection multiple, water saturation and permeability change multiple, The concept of "equivalent diffusion coefficient" based on "saturation difference" is proposed, and a plane mathematical model containing water content at output end is established. In view of the fact that the "thief layer" is the main channel of ineffective water circulation, the dilution multiple is defined, the analytical solution of water content at the output end is realized, and a fast quantitative method for the thickness of channeling channel, permeability difference and equivalent diffusion coefficient is established. The application results of field examples show that the thickness of channeling passage is 0.04 m ~ 0.38 m and the permeability difference is 22 ~ 8 m respectively, which is consistent with the tracer interpretation results. The equivalent diffusion coefficient obtained by interpretation also represents the fingering degree of reservoir microcosmic heterogeneity and oil-water viscosity ratio, as well as the size of channeling channel sweep area.
【作者单位】：中海石油(中国)有限公司天津分公司;中国石油大学(北京)提高采收率研究院;中国石油大学(北京)石油工程教育部重点实验室;
【基金】：国家科技重大专项“渤海油田高效采油工程及配套技术集成及示范”(编号:2016ZX05058-003-018) 中海石油有限公司科研项目“渤海高含水油田在线调驱技术研究与应用”(编号:YXKY-2016-TJ-02) 北京市自然科学基金资助项目“基于数字岩心的数字渗流基础探索研究”(编号:2173061)
【分类号】：TE53

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