西南石油大学学报(自然科学版)

• 石油机械工程 • 上一篇    下一篇

受井眼约束带接头管柱的纵横弯曲分析

黄文君*,高德利   

  1. 中国石油大学(北京)石油工程教育部重点实验室,北京昌平102249
  • 出版日期:2015-10-01 发布日期:2015-10-01
  • 通讯作者: 黄文君,E-mail:huangwenjun1986@126.com
  • 基金资助:

    国家自然科学基金创新研究群体科学基金(51221003);国家科技重大专项(2011ZX05009 005);国家自然科学基金委员会(中国石油化
    工股份有限公司)(U1262201)。

Deflection Analysis of a Tubular String with Connectors#br# Constrained in a Wellbore

Huang Wenjun*, Gao Deli   

  1. MOE Key Laboratory of Petroleum Engineering(Beijing),China University of Petroleum,Changping,Beijing 102249,China
  • Online:2015-10-01 Published:2015-10-01

摘要:

针对受井眼约束带接头管柱的纵横弯曲问题,将管柱变形分成3 类情形:无接触、点接触和连续接触。根据
管柱变形基本方程及接头处管柱的边界条件和连续性条件,分别求解3 种情形下的管柱变形曲线。利用无接触到点
接触以及点接触到连续接触的判别条件,分别求解了接触状态转换的临界参数,并分析了临界参数(φ)随管柱视半径
与接头视半径之比(λ)的变化规律。结果表明,当λ 比1 略大时,φ 对λ 的变化很敏感;当λ 大于2 后,φ 对λ 的变化
不敏感,并且趋于某一稳定值。以λ = 2 为例,详细描述了管柱弯曲接触状态转换的整个过程。计算结果可以为实际
作业中接头对管柱弯曲影响分析提供理论基础。

关键词: 纵横弯曲, 接头, 无接触, 点接触, 连续接触

Abstract:

Deflection of a tubular string with connectors constrained in a wellbore includes three cases: no contact,point contact
and wrap contact. The deflection curves of tubular strings under the three cases were obtained on the basis of the fundamental
equations of tubular strings buckling and corresponding boundary conditions. The critical parameters from no contact to point
contact and from point contact to wrap contact were calculated according to the transitional conditions between different contact
cases. The relationship between the critical parameters(φ)and the ratio of the apparent radius of the tubular string to that of
the connector(λ)was analyzed. The results show that when λ is slightly larger than 1,φ is sensitive to λ,but when λ is larger
than 2,φ is not sensitive to λ and tends to stay at a stable value. Take λ=2 for instance,the entire process of contact state
transitions was depicted in detail. The results in this paper can be applied to the analysis of the effect of connectors on tubular
strings buckling in field operation

Key words: deflection, connector, no contact, point contact, wrap contact

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