连续油管注入头系统力学行为仿真

发布时间：2018-05-26 02:17

本文选题：注入头系统 + 环境载荷　；参考：《燕山大学》2015年硕士论文

【摘要】：随着连续油管作业技术的发展,越来越多的连续油管作业机被应用到油田开发中。连续油管作业机自出现到发展至今,出现过滚筒速度过快而失控、液压系统紊乱、不能提供足够的夹紧力、油管被下入和起出的过程中出现异响、注入头驱动主轴被折断或链条张紧轴被折断、注入头系统的链条被损坏等故障,给施工作业造成了一定的影响。注入头作为连续油管作业机的核心部件,其性能日益为人们所重视。本文针对注入头系统在现场使用过程中出现的损坏和故障,对注入头系统的研究开展了以下几方面的工作:首先阐述了连续油管注入头的工作原理和基本功能,对其环境载荷进行了分析;对夹持块与连续油管间的接触压力进行了分析,得出了接触应力随着摩擦系数变化的曲线。通过比较选取了最优摩擦系数,使得夹持块与连续油管有较小的应力集中并且能有很好的夹持效果,为夹持块的优化设计提供了理论依据。其次对连续油管作业机注入头夹持力的应力分布进行了研究,基于弹性力学平面问题的复变函数法,对前人的夹持管柱径向压力的假设进行改善,提出夹紧力为非正弦分布的假设;详细推导了连续油管在夹持块夹紧力的作用下的应力公式;利用Ansys软件得出的有限元结果验证了此解法的正确性。最后借助ANSYS软件并利用正交试验法,进行了夹持块参数的敏感性分析,并从夹持块相关参数如截面参数、内径尺寸及接触面的卡牙设计方面对夹持块进行了参数分析与优化,以最大限度降低连续油管应力集中,延长使用寿命,为提升注入头的使用寿命和现场作业的效率提供了理论依据和数据参考。
[Abstract]:With the development of continuous tubing technology, more and more coiled tubing machines are applied to oilfield development. From the appearance to the development of the continuous tubing machine, the roller has been too fast and out of control, the hydraulic system is disordered, it can not provide enough clamping force, and there is an abnormal noise in the process of the tubing going in and out. The main shaft of the injection head is broken or the tension shaft of the chain is broken, and the chain of the injection head system is damaged, which has a certain effect on the construction operation. As the core part of continuous tubing machine, the performance of injector is paid more and more attention. Aiming at the damage and failure of the injection head system in the field, the research of the injection head system has been carried out in the following aspects: firstly, the working principle and basic function of the continuous tubing injection head are expounded. The contact pressure between the clamping block and the continuous tubing is analyzed, and the curve of the contact stress changing with the friction coefficient is obtained. By comparing and selecting the optimal friction coefficient, the clamping block and the continuous tubing have small stress concentration and good clamping effect, which provides a theoretical basis for the optimum design of the clamping block. Secondly, the stress distribution of the clamping force at the injection head of the continuous tubing machine is studied. Based on the complex variable function method of the plane problem of elastic mechanics, the former hypothesis of the radial pressure of the clamping pipe string is improved. The assumption that the clamping force is a non-sinusoidal distribution is proposed, the stress formula of the continuous tubing under the clamping force of the clamping block is deduced in detail, and the correctness of the solution is verified by the finite element results obtained by Ansys software. Finally, the sensitivity analysis of the parameters of the clamping block is carried out with the aid of ANSYS software and the orthogonal test method, and the parameters of the clamping block are analyzed and optimized from the aspects of the parameters of the clamping block, such as section parameters, inner diameter dimensions and the design of the gripping teeth of the contact surface. In order to minimize stress concentration of continuous tubing and prolong service life, this paper provides theoretical basis and data reference for improving service life of injection head and efficiency of field operation.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2

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