新疆石油地质

新疆石油地质 ›› 2009, Vol. 30 ›› Issue (5): 593-595.

• 油藏工程 • 上一篇    下一篇

低渗透气藏拟稳态三项式产能方程及应用

李闽1, 薛国庆2, 罗碧华2, 杨文娟1   

  1. 1.西南石油大学 油气藏地质及开发工程国家重点实验室,成都 610500;
    2.中海石油 湛江分公司 研究院,广东 湛江 524057
  • 收稿日期:2008-12-04 修回日期:2009-02-16 出版日期:2009-10-01 发布日期:2020-09-30
  • 作者简介:李闽（1962-）,男,四川射洪人,副教授,油气田开发,（Tel）028-83034269（E-mail）hytlxf199548@163.com.

Pseudosteady-State Trinomial Deliverability Equation and Application of Low Permeability Gas Reservoir

LI Min1, XUE Guo-qing2, LUO Bi-hua2, YANG Wen-juan1   

  1. 1.State Key Laboratory of Oil and Gas Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2.Research Institute, Zhanjiang Oilfield Company, CNOOC, Zhanjiang, Guangdong 524057, China
  • Received:2008-12-04 Revised:2009-02-16 Online:2009-10-01 Published:2020-09-30

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摘要： 低渗透气藏具有常规气藏不具备的诸多特征,其低孔低渗、非均质性强和含水饱和度高等导致了气体渗流类似液体渗流的“启动压力梯度效应”显著,用常规二项式渗流方程难以描述气体在低渗透气藏中的真实渗流特征,用常规的二项式产能方程不能分析低渗透气藏气井的产能。因此,在常规二项式渗流方程中添加了启动压力梯度项,并结合气井在正常生产期内的生产状态,建立了考虑启动压力梯度的拟稳态三项式产能方程,给出了低渗透气藏气井无阻流量的计算公式,为低渗透气藏气井合理产量的确定提供了理论依据。

关键词: 低渗透油气藏, 启动压力梯度, 产能方程

Abstract: Low permeability gas reservoir is characterized by low porosity, low permeability, serious heterogeneity and high water saturation, etc, which result in that the threshold pressure gradient effect similar to liquid percolation is remarkable for gas percolation. The conventional binomial deliverability equation is hard used to describe the real flow feature and deliverability of gas in such a reservoir. Adding the item of threshold pressure gradient into this equation, integrated with gas well performance in ordinary production period, this paper deduces the pseudosteady-state trinomial deliverability equation considering the threshold pressure gradient and presents the formula for calculating open flow potential of gas well in low permeability reservoir, so as to offer theoretical basis for determination of its rational production.

Key words: low permeability reservoir, threshold pressure gradient, deliverability equation

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