天然气地球科学

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考虑水平井穿透复合气藏内区的不稳定产能分析

姜瑞忠,郜益华,孙召勃,滕文超,乔欣,李渊   

  1. 1.中国石油大学(华东)石油工程学院,山东 青岛 266580;
    2.中国石油(中国)有限公司天津分公司,天津 塘沽 300452
  • 收稿日期:2014-12-30 修回日期:2015-03-25 出版日期:2015-09-10 发布日期:2015-09-10
  • 作者简介:姜瑞忠(1964-),男,江苏溧阳人,教授,博士生导师,主要从事油气田开发研究. E-mail:jrzhong@126.com.
  • 基金资助:

    国家自然基金“页岩气藏多级压裂水平井流动特征及产能评价方法研究”(编号:51374227);国家重大专项“大型油气田及煤层气开发科技重大专项”课题“特低渗油藏有效开发技术”(编号:2011ZX0513-006);国家自然基金“基于新模型的低渗透油藏非线性渗流理论”(编号:51174223)联合资助.

Rate Transient Analysis for Horizontal Well Passing through Inner Region of Composite Gas Reservoir

JIANG Rui-zhong,GAO Yi-hua,SUN Zhao-bo,TENG Wen-chao,QIAO Xin,LI Yuan   

  1. 1.School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;
    2.China National Offshore Oil Corporation(CNOOC) Limited Tianjin Branch,Tianjin 300452,China
  • Received:2014-12-30 Revised:2015-03-25 Online:2015-09-10 Published:2015-09-10

摘要:

在气藏的实际开发过程中,由于酸化、地层污染或气藏本身的地质特点,会形成水平方向上物性不同的复合气藏。针对这一问题建立了考虑穿透复合气藏内区的水平井不稳定渗流模型,并在此基础上进行了不稳定产能分析。采用拉普拉斯变换、Muskat方法、点源函数叠加和杜哈美原理求解模型,得到了复合气藏水平井在拉式空间下的不稳定拟压力解。由不稳定拟压力解和Stehfest数值反演方法得到了真实空间下水平气井的不稳定产量解。并绘制了不同条件下的无因次产能曲线,分析了水平井穿透内区后无因次内区半径、表皮系数、内外区流度比、外区与内区储容比对水平井产能的影响。

关键词: 复合气藏, 水平井, 穿透内区, 不稳定产能分析, 无因次产能曲线

Abstract:

In the process of gas reservoir development,a composite reservoir may be formed due to acidification,formation pollution or reservoir geological characteristics.An unsteady flow mathematical model is established for horizontal well passing through the inner region of the composite gas reservoir,and the rate transient analysis(RTA)is also conducted.In order to solve the problem,Laplace transform,Muskat method,the superposition of point source and the principle of Duhamal are used to get the transient pseudopressure of horizontal well.On the basis of the transient pseudopressure,the transient rate of horizontal well in real space is obtained by the Stehfest numerical inversion method.The dimensionless rate curves are plotted,and the effects of the dimensionless inner area radius,skin factor,the mobility ratio,the storativity ratio on the dimensionless rate of horizontal well passing through the inner region are analyzed.

Key words: Composite gas reservoir, Horizontal well, Passing through the inner region, Rate transient analysis, Dimensionless rate curve

中图分类号: 

  • TE33

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