错断井组合钻具力学分析

发布时间：2018-09-06 18:47

【摘要】：随着油水井生产时间的不断延长,受生产开发方案、不同的地质、工程等条件的影响,油水井套管技术状况逐渐变差,套管发生变形、错断等情况,需要采用修复方法使套损井重新恢复生产。针对套管错断、挤压缩径两种套损形式的修井工艺,考虑磨鞋、铣锥两种钻头结构形式,通过对钻头与套损管相互切削模式的简化和分析,推导了钻压、扭矩等载荷的关系式；综合考虑了组合钻具结构、钻具与套管的碰撞接触、各种外载荷等因素,建立了磨鞋、铣锥组合钻具非线性瞬态动力学分析模型,使钻具在井下的工作状态得以合理描述。采用动力间隙元理论,使钻具与套管的碰撞接触问题得以描述,结合空间梁单元的动力学分析方程式,采用NEWMARK法求解钻具动力学问题,为修井钻具瞬态动力学分析提供了一种行之有效的计算方法。依据建立的模型与理论方法,编制动力学分析软件,对钻头为平底磨鞋、高效铣锥的两类组合钻具进行动力学分析,得到组合钻具受力变形与套管内壁接触碰撞状态、组合钻具的运动状态,完成室内实验及动力学分析结果评价,为错断井修井管柱组合设计与工艺参数选取提供了理论依据。
[Abstract]:With the continuous extension of the production time of oil and water wells and the influence of production and development schemes, different geological and engineering conditions, the casing technical conditions in oil and water wells are gradually becoming worse, casing deformation and failure occur, etc. A repair method is needed to restore the casing damaged well to production. Aiming at the workover technology of casing failure and squeezing compression diameter, considering the two kinds of drill bit structure forms, grinding shoes and milling cone, the relationship between drilling pressure, torque and other loads is deduced by simplifying and analyzing the mutual cutting mode between bit and casing damage pipe. The nonlinear transient dynamic analysis model of combined drilling tools, such as the structure of combined drilling tools, the collision contact between drilling tools and casing, and various external loads, is established, which makes the working state of drilling tools in the downhole reasonably described. The dynamic gap element theory is used to describe the collision contact problem between drilling tool and casing, and the dynamic analysis equation of space beam element is used to solve the dynamic problem of drilling tool by NEWMARK method. It provides an effective calculation method for transient dynamic analysis of workover drilling tools. Based on the established model and theoretical method, the dynamic analysis software is compiled to analyze the dynamics of two kinds of combined drilling tools, which have flat sole grinding shoes and high efficiency milling cone, and obtain the stress deformation of combined drilling tool and the contact collision state of casing inner wall. The motion state of the combined drilling tools and the evaluation of the results of laboratory experiments and dynamic analysis provide a theoretical basis for the combination design of the workover string and the selection of technological parameters for the staggered well workover.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE921

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