膨胀点声源声场井孔模型建立及模拟研究  

Study on model establishment and simulation of acoustic field borehole of expansion point source

作　　者：陈达[1] Chen Da(Northeast Petroleum University,Daqing 163318 , China)

机构地区：[1]东北石油大学,黑龙江大庆163318

出　　处：《能源与环保》2017年第5期132-136,共5页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家科技重大专项(2008ZX05012-002)

摘　　要：声波测井中,不同地层中的全波列曲线特性导致井孔声场规律的不同,从而难以得到准确的反馈信息,采用弹性动力学基本方程推导声场波动方程,建立单极源弹性地层充流井孔声场的轴对称动力学模型,利用虚宗量的Bessel函数表达波动方程的解,得到井内外声场的位移及应力的表达式,结合快速和慢速地层参数,分别对井孔内外声场进行模拟计算;通过分析径向位移、轴向位移、正应力的全波列时域波形图,得到不同地层中的纵波、横波、斯通利波的速度、敏感性等参数特性,为声波测井技术中全波场特性研究提供理论支持,对提高声信号反馈信息的准确度具有重要意义。In acoustic logging,due to the difference of full wave train curve characteristics,the laws of acoustic field for boreholes are different,and it is difficult to obtain the accurate feedback information. Firstly,the axisymmetric dynamic model of the borehole acoustic field of a monopole source with elastic formation was established. Using the elasto-dynamical equations to derive acoustic wave equation. Using the Bessel function of imaginary argument to show the solution of the wave equation. The expressions for the displacement and stress of the sound field inside and outside the well were obtained. Combined with fast and slow formation parameters, the sound field in-side and outside the well was simulated and calculated. Through the analysis of the full wave time-domain waveform of radial displace-ment and axial displacement and normal stress,Stone wave,P-wave and S-wave velocity,the sensitivity of parameters in different strata were obtained. This paper provides theoretical support for the research of the whole wave field characteristics in acoustic logging technol-ogy, which is of great significance to improve the accuracy of the feedback information of acoustic signals.

关 键 词：声波测井 膨胀点声源 全波列波形 波动曲线 地层 

分 类 号：O422.2[理学—声学]