石油学报 ›› 2010, Vol. 31 ›› Issue (5): 815-819.DOI: 10.7623/syxb201005020

• 油田开发 • 上一篇    下一篇

缝洞型油藏的离散缝洞网络流动数学模型

姚  军  黄朝琴  王子胜  李亚军  王晨晨   

  1. 中国石油大学石油工程学院  山东青岛  266555
  • 出版日期:2010-09-25 发布日期:2010-11-30
  • 通讯作者: 姚 军
  • 作者简介:姚 军,男,1964年3月生,1984年毕业于华东石油学院,现为中国石油大学(华东)教授,博士生导师,主要从事油气田开发工程的教研工作。
  • 基金资助:

    国家重点基础研究发展规划(973)项目(2006B202404)和国家科技重大专项(2008ZX05014-05-003)联合资助。

Mathematical model of fluid flow in fractured vuggy reservoirs based on discrete fracturevug network

YAO Jun  HUANG Zhaoqin  WANG Zisheng  LI Yajun  WANG Chenchen   

  • Online:2010-09-25 Published:2010-11-30

摘要:

针对现有油藏渗流理论在描述缝洞型油藏流动机理上存在的困难,基于缝洞型油藏储层的特点,提出了离散缝洞网络流动数学模型。该模型将缝洞型油藏划分为岩块系统、裂缝系统和溶洞系统;其中裂缝和溶洞嵌套于岩块中,并相互连接成网络;岩块和裂缝系统视为渗流区域,溶洞系统视为自由流动区域。阐述了模型的基本原理,推导了相应的有限元数值计算格式,通过算例验证了其正确性。算例分析结果表明,离散缝洞网络流动数学模型能够正确地描述出缝洞型油藏的流动特征。

关键词: 缝洞型油藏, 离散缝洞网络, 自由流动, 耦合流动, 有限元数值计算

Abstract:

The current percolation theory is difficult to describe the fluid flow mechanism in naturally fractured vuggy reservoirs. A new mathematical model, namely discrete fracture-vug network model, was proposed to solve the problem. The fractured vuggy reservoir was divided into three systems in the new model, including the porous rock system, fracture system and vug system. The fractures and vugs were supposed to be embedded in the porous rock, and the isolated vugs were connected via discrete fracture network. The fluid flow in porous rock and fractures followed the Darcy Law. The rock fractures were taken as seepage area, and the vugs system was the free fluid flow region. The principles of the mathematical model were discussed. The corresponding finite element numerical formulas were proposed. The numerical computation results showed that the discrete fracture-vug network model could provide a natural way for modeling the realistic conditions in fractured vuggy reservoirs.

Key words: fractured vuggy reservoirs;discrete fracture-vug network, free fluid flow, coupling flow, finite element numerical computation