射孔段管柱动力响应模型建立及数值分析

发布时间：2018-03-20 08:04

本文选题：射孔管柱　切入点：动力响应　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：射孔作业过程中,射孔弹爆炸后会产生巨大的冲击载荷,引起井下管柱及工具剧烈振动,严重时会导致管柱弯曲断裂、封隔器损坏及胀枪卡枪等事故,降低射孔作业安全性。因此,为了减少射孔作业事故的发生,本文针对射孔冲击载荷作用下管柱动力响应问题进行研究。不考虑射孔液的影响,分别针对轴向、横向及扭转冲击载荷作用下,应用振动力学悬臂梁理论,建立射孔段管柱动力学模型,导出管柱一维振动微分方程;应用ANSYS软件建立射孔段管柱三维有限元模型,分别得到轴向、横向及扭转载荷分量下管柱瞬态响应规律。考虑射孔液的影响,应用FLUENT软件建立射孔液流体动力学模型,分析冲击载荷下射孔液的压力脉动规律;将射孔液脉动压力作为外载荷,分析射孔液对管柱动力响应的影响。综合考虑爆炸冲击载荷及射孔液压力脉动的作用,建立射孔液及管柱耦合模型,得到射孔段管柱位移、速度、加速度及等效应力响应规律。应用有限元法对射孔段管柱进行瞬态动力响应分析,分别得到了管柱位移、速度、加速度及等效应力响应曲面。管柱位移、速度、加速度及等效应力响应均随时间周期性变化,且越靠近封隔器处,响应幅值越小,表明距离射孔冲击爆炸源越远,射孔冲击波衰减越大。沿管柱轴线方向,从管柱底端到封隔器处端面,位移、速度、加速度逐渐减小,最大等效应力逐渐增大;由于管柱上端受到封隔器的约束作用,存在应力集中现象,等效应力由管柱内壁到外壁逐渐增加。同时,应用控制变量法,分析了管柱长度、外径及壁厚等因素对射孔段管柱动力响应的影响。随着管长、外径及壁厚的增加,冲击载荷下管柱动力响应幅值减小,建议优先选择管长、外径及壁厚均较大的管柱。本文可为冲击载荷作用下管柱组合优选及强度安全性分析提供依据。
[Abstract]:In the process of perforation, the explosion of perforating projectile will produce huge impact load, which will cause severe vibration of downhole string and tools, and will lead to bending fracture of string, damage of Packer and expansion of gun, etc. Therefore, in order to reduce the occurrence of perforation accidents, the dynamic response of pipe string under perforation impact load is studied in this paper. Under transverse and torsional impact loads, the dynamic model of perforated pipe string is established by using the theory of vibration dynamic cantilever beam, and the differential equation of one-dimensional vibration of perforated pipe string is derived, and the three-dimensional finite element model of perforated pipe string is established by using ANSYS software. The transient response of string under axial, transverse and torsional loads is obtained. Considering the influence of perforating fluid, the fluid dynamics model of perforating fluid is established by using FLUENT software, and the pressure fluctuation of perforating fluid under impact load is analyzed. Taking the pulsating pressure of perforating fluid as external load, the influence of perforating fluid on the dynamic response of pipe string is analyzed. Considering the effect of explosion shock load and perforating hydraulic force pulsation, a coupling model of perforating fluid and string is established, and the displacement of perforated pipe string is obtained. The response law of velocity, acceleration and equivalent stress. The transient dynamic response of perforated pipe string is analyzed by finite element method, and the displacement, velocity, acceleration and equivalent stress response surface of pipe string are obtained, respectively. Both acceleration and equivalent stress response change periodically with time, and the smaller the response amplitude is, the closer the response amplitude is to the Packer, which indicates that the farther away from the perforating shock source, the greater the attenuation of perforated shock wave. From the bottom end of the string to the end of the Packer, the displacement, velocity and acceleration gradually decrease, and the maximum equivalent stress increases gradually, because the upper end of the string is restrained by the Packer, there is a phenomenon of stress concentration. The equivalent stress increases gradually from the inner wall of the string to the outer wall. At the same time, the effects of the length, diameter and thickness of the string on the dynamic response of the perforated pipe are analyzed by using the control variable method. With the increase of the pipe length, the outside diameter and the wall thickness, As the amplitude of dynamic response of string decreases under impact load, it is suggested that priority should be given to the string with long pipe length and larger outer diameter and wall thickness. This paper provides a basis for the optimization of string combination and the analysis of strength safety under impact load.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE257.1

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