低频振动对低渗油藏径向渗流影响的变参量Biot固结分析

发布时间：2018-02-28 17:43

本文关键词： 波动采油低渗开发油藏渗流影响径向模型　出处：《岩土工程学报》2017年04期 　论文类型：期刊论文

【摘要】：基于波动采油对低渗储层物性改善的动态过程,利用变参量的岩土固结模型分析弹性波对饱和渗流流体径向模型流固位移、孔隙压力等的影响规律。通过Laplace变换与迭代消去,得到拉氏变换下低渗开发油藏波动控制方程为变系数高阶微分方程;利用变系数向量拆分与矩阵求法,推导了波动采油作用下饱和单相流体径向(定流量或定压)开发储层的流固位移近似解。通过Matlab编程,算例分析了饱和水相介质和不同振动频率下饱和油相介质的渗流、物性变化。结果表明,低频波动采油技术可增加低渗开发储层孔压和渗流速度,文中基础参数下,存在最佳振动频率5~30 Hz使得增幅最大,作用范围可达60 m,径向模型Laplace变换 Durbin离散近似求解适用于波传播时间较小的情况。
[Abstract]:Based on the dynamic process of fluctuating oil recovery to improve the physical properties of low permeability reservoir, the influence of elastic wave on fluid displacement and pore pressure of saturated percolation fluid radial model is analyzed by using the rock and soil consolidation model with variable parameters, which is eliminated by Laplace transform and iteration. The wave control equation of low permeability reservoir under Laplace transform is obtained as high order differential equation with variable coefficient, and the variable coefficient vector splitting and matrix solving method are used. The approximate solution of fluid-solid displacement of saturated single-phase fluid developed in radial direction (constant flow rate or constant pressure) under the action of fluctuating oil recovery is derived. By means of Matlab programming, the seepage flow of saturated water-phase medium and saturated oil-phase medium at different vibration frequencies is analyzed. The results show that the low frequency wave oil recovery technology can increase the pore pressure and percolation velocity of the low permeability development reservoir. Under the basic parameters of the paper, the optimum vibration frequency of 5 ~ 30 Hz makes the maximum increase. The range of action is up to 60 m, and the radial model Laplace transform / Durbin discrete approximation solution is suitable for the case where Yu Bo propagation time is relatively small.
【作者单位】：中国石油大学(华东)石油工程学院;
【基金】：国家自然科学基金项目(51274229) 山东省自然科学基金项目(ZR2016EEQ04) 中央高校基本科研业务费专项资金项目(16CX02020A)
【分类号】：TE312

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