启动压力影响下注采井间有效驱替规律

发布时间：2018-10-24 08:27

【摘要】：低渗透储层具有明显的启动压力梯度,导致注采井间的渗流场分布与常规条件存在一定差异.基于典型注采条件下的渗流特点和驱替过程分析,在产量方程中引入启动压力梯度,构建出考虑启动压力影响下一注一采定产渗流模型.通过推导得出注采井间压力场、速度场分布的数学表达式,并建立计算注采井间有效驱替面积、有效注采井距的方法,得到不同开发条件下井间渗流场分布和注采单元中有效驱替范围变化的规律.结合典型低渗透油藏参数进行的研究表明,根据有效驱替要求确定有效注采井距,并以此为基础部署开发井网,能在更大程度上有效驱动注采单元内的流体,进而提高低渗透油藏的开发效果.
[Abstract]:The low permeability reservoir has obvious start-up pressure gradient, which leads to the difference of seepage field distribution between injection-production wells and conventional conditions. Based on the analysis of seepage characteristics and displacement process under typical injection-production conditions, starting pressure gradient is introduced into the production equation, and a model of fixed yield seepage under the influence of start-up pressure is established. The mathematical expressions of the distribution of pressure field and velocity field between injection and production wells are derived, and the method of calculating the effective displacement area and effective injection-production spacing between injection and production wells is established. The distribution of cross-well seepage field and the variation of effective displacement range in injection-production units are obtained under different development conditions. Combined with the study of typical low permeability reservoir parameters, it is shown that according to the effective displacement requirements, the effective injection-production well spacing can be determined and the development well pattern can be deployed on the basis of which the fluid in the injection-production unit can be effectively driven to a greater extent. And then improve the development effect of low permeability reservoir.
【作者单位】：中国石油大学(北京)石油工程学院;
【基金】：国家重点基础研究发展计划资助项目(2015CB250905)~~
【分类号】：TE348

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