低渗储层非线性渗流规律对油田开发的影响分析

以室内岩芯实验为基础,建立了五点井网非均质地质模型。应用研制的特低渗透油藏非线性渗流数值模拟软件研究非线性渗流规律对油田开发的影响。将考虑储层非线性渗流规律和达西渗流规律的模拟结果进行对比分析。研究结果表明:非线性渗流规律降低了储层的吸水能力,加剧了储层非均质性对开发的影响,降低了油田的整体开发效果。渗透率较低非线性程度较强储层水驱效果变差,油井见水时间滞后,含水率低;注水沿人工裂缝方向推进速度与达西渗流模拟结果相差不大,垂直人工裂缝方向推进速度变慢。低渗透油田开发及合理井网部署需考虑非线性渗流规律。

Influence of nonlinear flow on low-permeability reservoir exploitation

A heterogeneous reservoir geological model of five-spot well net is established based on laboratory core experiments.The nonlinear flow reservoir numerical simulator is used to analyze the influence of nonlinear flow on low-permeability reservoir exploitation.The comparative analysis of nonlinear flow and Darcy flow numerical simulation results is provided.Studies show that the nonlinear flow reduces the reservoir water–intake capability and intensifies the effect of heterogeneity on the exploitation of low-permeability reservoirs.The water flooding effect of the relatively low permeability and high nonlinear flow degree zone becomes worse.The water breakthrough time lags behind and the water cut of production is low.The water propelling speed of nonlinear flow along the artificial fracture has little difference with that of Darcy flow.But in vertical direction of artificial fracture,it is greatly slower than that of Darcy flow.The nonlinear flow should be researched during the exploitation of low-permeability reservoirs and well pattern arrangement.