固井井下水力超声与低频脉动发生装置研究

发布时间：2019-01-04 23:27

【摘要】：水力超声和低频脉动固井技术是在下套管、注灰、顶替和候凝的过程中,以流体为动力源,通过安装在浮箍以下,套管接箍间的水力超声与低频脉动发生装置来产生超声波与低频脉动波,使其作用于套管内和环空中固井液、钻井液来提高固井质量的一项技术。本论文主要以常用的帕尔曼超声发生装置和井下低频脉动发生装置为研究对象,分析了低频脉动波对抑制环空气窜、提高顶替效率、增强一二胶结面强度、缩短初终凝过渡时间的作用和超声波化学、力学、热学效应对水泥浆的流变性等参数的影响和为水泥浆在候凝时水化反应提供更好的环境。从而为该固井技术的应用提供了理论基础。通过求解帕尔曼发生器簧片在水泥浆中的谐频和液片的谐频,得到声波的频率范围,根据Urick-Lamb声强衰减计算模型分析声波的吸收衰减和散射衰减及其影响因素并得到声强的有效传播距离。同时分析低频脉动波在环空水泥浆中的传播规律,通过建立力学模型,求解低频脉动波的波动方程。通过振幅变化率及其影响因素来分析低频脉动波的有效传播距离,进而为该固井技术提供可行性和参数优化分析。
[Abstract]:Hydraulic ultrasonic and low frequency pulsation cementing technology is in the process of casing, ash injection, displacement and weathering, using fluid as power source, by installing under floating hoop, The hydraulic ultrasonic and low frequency pulsation generating device between casing and hoop to produce ultrasonic and low frequency pulsation wave, make it act on casing and annulus air cementing fluid, drilling fluid to improve cementing quality. In this paper, the commonly used Perman ultrasonic generator and downhole low frequency pulsation generator are taken as the research objects, and the effects of low frequency pulsation wave on suppressing annular air channeling, improving displacement efficiency and enhancing the strength of one or two cementing surface are analyzed. The effect of shortening the transition time of initial and final setting and the effects of ultrasonic chemistry, mechanics and thermal effect on the rheological properties of cement slurry and providing a better environment for hydration reaction of cement slurry during weathering. It provides a theoretical basis for the application of this cementing technology. By solving the harmonic frequency of Reed in cement slurry and the harmonic frequency of liquid sheet, the frequency range of acoustic wave is obtained. According to the calculation model of Urick-Lamb intensity attenuation, the absorption attenuation and scattering attenuation of sound wave and its influencing factors are analyzed, and the effective propagation distance of sound intensity is obtained. At the same time, the propagation law of low frequency pulsating wave in annular cement slurry is analyzed, and the wave equation of low frequency pulsating wave is solved by establishing a mechanical model. The effective propagation distance of low frequency pulsating wave is analyzed by amplitude change rate and its influencing factors, which provides feasibility and parameter optimization analysis for this cementing technology.
【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】：TE256

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