石油学报 ›› 2008, Vol. 29 ›› Issue (6): 917-921.DOI: 10.7623/syxb200806025

• 石油工程 • 上一篇    下一篇

空气钻井钻具组合动力学特征及井斜机理研究

狄勤丰1, 朱卫平1, 姚建林1, 赵业荣2, 雷桐2, 张汉林2   

  1. 1. 上海大学上海市应用数学和力学研究所 上海 200072;
    2. 中国石油长庆石油勘探局 陕西西安 710061
  • 收稿日期:2008-01-15 修回日期:2008-04-09 出版日期:2008-11-25 发布日期:2010-05-21
  • 基金资助:
    国家自然科学基金项目(No.50174047、No.50674065);上海市科委项目(061658035);上海市重点学科建设项目(Y0103)联合资助

Dynamic features of bottom hole assembly and borehole deviation mechanism in air drilling

DI Qinfeng1, ZHU Weiping1, YAO Jianlin1, ZHAO Yerong2, LEI Tong2, ZHANG Hanlin2   

  1. 1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China;
    2. PetroChina Changqing Petroleum Exploration Bureau, Xi'an 610072, China
  • Received:2008-01-15 Revised:2008-04-09 Online:2008-11-25 Published:2010-05-21

摘要: 研究了用牙轮钻头进行空气钻井时光钻铤钻具组合动力学特征及井斜机理,建立了光钻铤钻具组合的转子动力学模型,分析了空气钻井与泥浆钻井时光钻铤钻具组合动力学特征的区别。结果表明,高碰摩系数使空气钻井时钻具组合反向涡动,空气的低阻力使空气钻井的涡动速度增大。泥浆钻井则相反,钻具组合以较低的涡动速度向前涡动。这些特征的综合作用使得空气钻井时钻头上的降斜力小于泥浆钻井,成为引起空气钻井井眼易斜的主要原因之一。

关键词: 空气钻井, 钻具组合, 井斜机理, 动力学模型, 涡动

Abstract: The dynamic features of bottom hole assembly(BHA)and mechanism of borehole deviation in air drilling were studied using slick drill collar. The dynamic model for rotor of slick BHA was established. The dynamic features of BHA under the conditions of mud fluid were compared to those of air drilling. The results show that the higher friction coefficients of borehole wall can result in a backward whirling motion of the BHA and lower damping coefficient of air makes the whirling speed higher in air drilling. The BHA in mud fluid drilling can whirl forward at a lower speed, due to the lower friction coefficients in the wall of borehole and higher damping coefficient of mud. The comprehensive function of these dynamic features made a smaller deviation dropping on bit in air drilling than that in mud drilling, which leads to the deviation of drilled borehole in air drilling.

Key words: air drilling, bottom hole assembly, borehole deviation mechanism, dynamic model, whirl

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