水力震荡式振动固井工具研究
发布时间：2019-05-28 08:43
【摘要】：振动固井可有效提高顶替效率和一、二界面的胶结强度。本文主要对水力它激振荡机理及其振动固井机理进行研究,以水力它激振荡振动固井工具腔室出口脉冲压力增加值为研究对象,对其腔室以及环空等空间内流体流动情况进行正交数值模拟,分析腔室结构和流体介质特性参数对腔室出口脉冲压力增加值大小的影响情况。研究成果如下： (1)水力它激振荡振动固井工具可使固井时套管底部出口的瞬时速度和压力大幅度提高,产生脉冲压力作用于环空流体,提高注水泥顶替效率。 (2)该振动固井工具产生的脉冲压力,从井底沿环空向上传播过程中,随距井底距离的增加而减小；脉冲压力最远传播距离与井底初始脉冲压力成正比。 (3)对该振动固井工具腔室内流体流动状态的数值模拟研究表明,均匀来流经过该它激振荡腔室后会发生强烈的振荡,形成振幅为0.7MPa的脉冲压力。 (4)影响该振动固井工具脉冲压力增加量的主要因素是上下口直径比值r和上口排量Q。当r=1.5时,脉冲压力增加量最大；随着上口排量Q的增大,脉冲压力明显增加,而其增加量的百分比却变化不大。 (5)在对该固井工具固井效果影响因素研究与分析的基础上,优化设计水力它激振荡振动固井工具的结构参数。 通过理论分析和数值模拟研究表明,本文设计的水力它激振荡振动固井工具能有效提高固井质量。
[Abstract]:Vibration cementing can effectively improve the replacement efficiency and the bonding strength of one and two interfaces. In this paper, the mechanism of hydraulic vibration and its vibration cementing mechanism are studied, and the added value of pulse pressure at the outlet of hydraulic vibration cementing tool chamber is taken as the research object. The orthogonal numerical simulation of fluid flow in chamber and annular space is carried out, and the influence of chamber structure and fluid medium characteristic parameters on the increase of pulse pressure at the outlet of chamber is analyzed. The research results are as follows: (1) hydraulic vibration cementing tool can greatly increase the instantaneous velocity and pressure at the bottom outlet of casing, produce pulse pressure acting on annular fluid, and improve the replacement efficiency of cement injection. (2) during the upward propagation of pulse pressure from the bottom hole along the annulus, the pulse pressure decreases with the increase of the distance from the bottom hole, and the furthest propagation distance of the pulse pressure is proportional to the initial pulse pressure at the bottom of the well. (3) the numerical simulation of the fluid flow state in the vibrating cementing tool cavity shows that the uniform incoming flow will oscillate strongly after passing through the vibrating cavity, and the pulse pressure with amplitude of 0.7MPa will be formed. (4) the main factors affecting the pulse pressure increase of the vibrating cementing tool are the ratio of upper and lower orifice diameter r and the upper mouth discharge Q. When r 鈮，
本文编号：2486913
[Abstract]:Vibration cementing can effectively improve the replacement efficiency and the bonding strength of one and two interfaces. In this paper, the mechanism of hydraulic vibration and its vibration cementing mechanism are studied, and the added value of pulse pressure at the outlet of hydraulic vibration cementing tool chamber is taken as the research object. The orthogonal numerical simulation of fluid flow in chamber and annular space is carried out, and the influence of chamber structure and fluid medium characteristic parameters on the increase of pulse pressure at the outlet of chamber is analyzed. The research results are as follows: (1) hydraulic vibration cementing tool can greatly increase the instantaneous velocity and pressure at the bottom outlet of casing, produce pulse pressure acting on annular fluid, and improve the replacement efficiency of cement injection. (2) during the upward propagation of pulse pressure from the bottom hole along the annulus, the pulse pressure decreases with the increase of the distance from the bottom hole, and the furthest propagation distance of the pulse pressure is proportional to the initial pulse pressure at the bottom of the well. (3) the numerical simulation of the fluid flow state in the vibrating cementing tool cavity shows that the uniform incoming flow will oscillate strongly after passing through the vibrating cavity, and the pulse pressure with amplitude of 0.7MPa will be formed. (4) the main factors affecting the pulse pressure increase of the vibrating cementing tool are the ratio of upper and lower orifice diameter r and the upper mouth discharge Q. When r 鈮，
本文编号：2486913
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