石油学报 ›› 2011, Vol. 32 ›› Issue (2): 299-306.DOI: 10.7623/syxb201102017

• 油田开发 • 上一篇    下一篇

特低渗透油藏非线性渗流数值模拟

杨仁锋 1  姜瑞忠 2  刘世华 3  张晓亮 1  刘海成 2   

  1. 1中海油研究总院  北京  100027; 2中国石油大学  山东东营  257061; 3中国石化石油工程技术研究院  北京  100101
  • 收稿日期:2010-07-14 修回日期:2010-11-01 出版日期:2011-03-25 发布日期:2011-05-25
  • 通讯作者: 杨仁锋
  • 作者简介:杨仁锋,男,1984年7月生,2010年毕业于中国石油大学(华东),现工作于中海油研究总院,主要从事油气田开发方面的科研工作。
  • 基金资助:

    国家科技重大专项(2008ZX05013-002)资助。

Numerical simulation of nonlinear seepage in ultra-low permeability reservoirs

YANG Renfeng 1  JIANG Ruizhong 2  LIU Shihua 3  ZHANG Xiaoliang 1  LIU Haicheng 2   

  • Received:2010-07-14 Revised:2010-11-01 Online:2011-03-25 Published:2011-05-25

摘要:

提出了一个非线性渗流新模型,并建立了非线性渗流数学模型,构造了相应的有限差分离散化格式,确定了考虑非线性渗流的井网格流动方程,编制了三维三相非线性渗流数值模拟软件。该模型同样具备模拟达西渗流模型和拟启动压力梯度模型的能力,为低渗透油藏数值模拟软件的工程化应用奠定了基础。利用该数值模拟软件分析了低渗透油藏非线性渗流区域以及非线性渗流对生产规律的影响,认为低渗透油藏流动区域绝大部分处于非线性渗流范围,利用拟启动压力梯度模型及达西模型进行计算均会产生较大误差,同时水相非线性渗流同样不可忽略。

关键词: 特低渗透, 非线性渗流, 启动压力梯度, 压敏效应, 数值模拟

Abstract:

It is the key to the increase of oil production in China to develop low permeability reservoirs, which urgently requires studying nonlinear seepage laws in detail. The present paper proposed a new seepage model and set up a nonlinear mathematical model by constructing the corresponding finite difference format, deriving a well-grid flow equation and producing a numerical simulation software for three-dimensional, three-phase nonlinear seepage. The Darcy model and the start-up pressure gradient model could also be simulated by this simulation software, which laid the foundation of engineering application of the numerical simulation software to low permeability reservoirs. The results showed that the majority of low permeability reservoir regions were in the range of nonlinear seepage, calculations by using either the start-up pressure gradient model or the Darcy model would produce considerable errors, while the nonlinear seepage of water phase could not be ignored.

Key words: ultra-low permeability, nonlinear seepage, start-up pressure gradient, pressure-sensitive effect, numerical simulation