西南石油大学学报(自然科学版)

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低渗透复合油藏压力动态有限元理论分析

张烈辉1 *,张芮菡1,蒋和煦2,孔玲2,佘娟2   

  1. 1.“油气藏地质及开发工程”国家重点实验室·西南石油大学,四川成都610500
    2. 中国石油西南油气田分公司勘探开发研究院,四川成都610041
  • 出版日期:2016-08-01 发布日期:2016-08-01
  • 通讯作者: 张烈辉,E-mail:zhangliehui@vip.163.com
  • 基金资助:

    国家自然科学基金(51374181)。

Theoretical Analysis of Low Permeability Composite Reservoir Using#br# Finite Element Method

ZHANG Liehui1*, ZHANG Ruihan1, JIANG Hexu2, KONG Ling2, SHE Juan2   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. Research Institute of Petroleum Exploration & Development,Southwest Oil and Gas Field Company,PetroChina,Chengdu,Sichuan 610041,China
  • Online:2016-08-01 Published:2016-08-01

摘要:

低渗透油藏非均质性较强,孔渗物性差,往往需要通过油藏增产改造获得工业产能。基于非均质油藏生产开
发实践,以实验测试得到附加阻力梯度与驱替压力梯度和流体流度关系式为基础,建立了低渗透复合油藏附加阻力梯
度渗流模型,并采用有限元解法对该非线性模型进行求解,得到了井底压力动态的数值解。研究结果表明,复合油藏
区域间物性差异对井底压力动态影响显著;附加阻力梯度的存在,使得压力及压力导数曲线在径向流阶段逐步上翘,
但上翘幅度小于传统的拟启动压力梯度模型。

关键词: 低渗透储层, 复合油藏, 有限元方法, 非线性渗流, 附加阻力梯度

Abstract:

Low permeability reservoir has strong heterogeneity and poor property,and stimulation is often needed to achieve
industrial productivity. Based on the heterogeneous reservoirs development practices and the relationship between added resistance
gradient and displacement pressure gradient and mobility,a well test model of added resistance gradient of composite
reservoir is established and solved by finite element method. Then the characteristic curves are gained and analyzed. The
results show that differences between the composite reservoir area have a significant impact on the dynamic characteristics of
the bottom hole pressure. Because of the added resistance gradient,dimensionless pressure and pressure derivative in log-log
well test plot goes upward gradually,but the amplitude is lower than that of the traditional pseudo threshold pressure gradient
method.

Key words: low permeability reservoir, composite reservoir, finite element method, non-linear flow, added resistance gradient

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