石油与天然气地质 ›› 2007, Vol. 28 ›› Issue (4): 523-527,519.doi: 10.11743/ogg20070414

• 开发地质技术 • 上一篇    下一篇

开关井不同程度应力敏感效应对井底压力动态的影响

刘启国1, 唐伏平2, 冯国庆1, 颜泽江2, 胡新平2, 陈军1, 李允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, 四川, 成都, 610500;
    2. 中国石油, 新疆油田分公司, 采油三厂, 新疆, 克拉玛依, 833600
  • 收稿日期:2007-06-08 出版日期:2007-08-25 发布日期:2012-01-16
  • 基金资助:

    中国石油天然气集团公司石油科技中青年创新基金项目(04E7047);四川省学术和技术带头人基金项目(2200320).

Influence of different stress sensitivities on bottom hole pressure behaviors during well opening and shut-in

Liu Qiguo1, Tang Fuping2, Feng Guoqing1, Yan Zejiang2, Hu Xinping2, Chen Jun1, Li Yun1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation·Southwest Petroleum University, ChengDu, Sichuan 610500;
    2. No.3 Oil Production Plant, PetoChina XinJiang Oil Company, Karamay, XinJiang 833600
  • Received:2007-06-08 Online:2007-08-25 Published:2012-01-16

摘要:

依据渗流实验建立的应力敏感效应经验关系式,从渗流力学基本理论出发,建立了考虑渗透率应力敏感、井筒储存效应和表皮效应影响的均质气藏试井分析数学模型。应用摄动技术和拉普拉斯变换方法求解数学模型,据此研究应力敏感性气藏的渗流特征以及开关井不同程度应力敏感效应对井底压力动态的影响。研究表明,随着渗透率应力敏感效应的增大,压降压力导数曲线向上翘起的幅度增大,而压恢压力导数曲线则可能出现下掉。当升、降压对渗透率的应力敏感不可逆时,升压过程不能使渗透率完全复原,其压力恢复的程度则更低。

关键词: 摄动技术, 拉普拉斯变换, 渗流特征, 压力导数, 应力敏感, 试井模型

Abstract:

Basing on the empirical equation of pressure stress-sensitive effect and the basic theory of fluid flowing mechanics in porous medium,a mathematical model for well testing analysis in homogeneous gas reservoirs is established with considerations of permeability sensitivity to stress,effect of wellbore storage,and skin effect.The perturbation technique and Laplace transform method are employed in the calculation of the model to study the features of percolation in stress-sensitive gas reservoirs and the influence of different stress sensitivities on bottom hole pressure behaviors during well opening and shut-in.The results show that along with the stress sensitivity of permeability increases,derivative curve may upturning higher during drawdown test,while the derivative curve may drop down during pressure build-up test.If the damage to permeability caused by stress sensitivity during drawdown/build-up test is irreversible,the permeability can not be fully recovered through pressure boosting and the degree of pressure buildup is still lower.

Key words: perturbation method, Laplace transform, percolation feature, pressure derivative, stress sensitivity, well test model

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