套管钻井远程液压式套管夹持器技术研究

Study on Remotely-controlled Hydraulic Casing Holder for Cased Drilling

针对国内现有套管夹持器操作效率较低及存在安全隐患等问题,设计了远程液压式套管夹持器技术方案。介绍了外卡式套管夹持器的结构和工作原理,建立了套管夹持器夹持机构的力学模型,并通过有限元分析和理论计算进行验证。分析结果表明,该机构靠套管柱自身重力夹紧套管柱,且夹紧力随下放管柱重力的增大而增大;壳体与卡瓦之间的摩擦因数对液压推力影响很大。远程液压式套管夹持器技术可解决现有技术存在的问题和水平井下套管的难题,为套管钻井技术在国内的发展和推广应用提供了重要的理论依据。

In China, the existing casing holders are disadvantageous for low operating efficiency and potential safety risks. Accordingly, a remotely-controlled hydraulic casing holder is developed, in this paper, the structure and working principle of the outside-clamping casing holder are introduced. A mechanical model of casing holding mechanism is established and validated by finite element analysis and theoretical calculations. The results indicate that the device holds the casing string via casing string gravity, and the clamping force increases with the increase of casing string gravity. The friction coefficient between the housing and the slip has significant effects on the hydraulic pushing force. The proposed remotely-controlled hydraulic casing holder can address the problems of existing technologies and the difficulties in running casing in horizontal well, providing an important theoretical basis for the development and promotion of eased drilling technology.