The Optimization Of Structural Parameters Of The Oil Production Increasing Ultrasonic Transducer Based On Electromechanical Coupling

With more emphasis on oil recovery technology，today ultrasonic technique has beused in oil field and other fields. The mechanism of ultrasonic near-wellbore techniqueis different from the conventional technology; ultrasonic oil extraction technology hasmany advantages, for example: security and stability, the device to be set up easily, thesimple process, low cost, fast effect, no structural damage to oil we lls and no oilpollution. In oil field cylindrical ultrasound transducer occupies a large proportion. Themain reason is that cylindrical transducer has a large power capacity, strong radiation;without considering the directivity of the ultrasonic wave propagation, the main goal ofthe development is to improve the acoustic energy based on ultrasonic energy formula.So many advantages make the ultrasonic transducer become the main device in the oiland gas exploration. In the field of high-power ultrasonic cleaning and acoustic loggingultrasonic transducer also play a very significant role. This article attempts to explainsome theories of the transducers and piezoelectric ceramics, then do a series of test trialsabout the frequency of transducer. Clarify direction of optimizing according to theresults. Finally, using the finite element software to build the model and calculationcomplete the purpose of structural optimization.(1) This article analyses the mechanism of well stimulation by using ultrasound,and briefly describes a porous medium particles clogging models. Then introduceultrasonic transducers to show the feasibility of increasing oil production. Describe thehistory and status of ultrasound to increase oil extraction technology and thedevelopment situation of transducer manufacturing equipment.(2) Analyses the work core features of the transducer, namely the piezoelectriceffect and the inverse piezoelectric effect of piezoelectric ceramic vibrator. Introducethe basic parameters of piezoelectric ceramic materials and equipment. Explain theeffects of different conditions and electrical boundary conditions gripping thepiezoelectric equations. Piezoelectric ceramic generates ultrasonic by vibration, and theenergy can be measured by sound intensity and sound pressure. Sound intensity andsound pressure have different definitions. By citing Bessel functions analysis ceramicoscillator vibration, then obtain a method for solving the resonant frequency of theceramic ring.(3) Take analyses about the transducer. The main tool for measuring transducer isthe signal analyzer as well as the Coinv DASP-V10analysis software. The signalanalyzer connects to the acceleration sensor attached to the wall of the transducer, andcollect vibration information by the signal acquisition capabilities of the device. In the non-working state we choose the LC series hammer to hit, and in working condition wecollect directly by the instrument. We obtain the transducer resonance frequency understatic and best optimal frequency, then the optimization goal is to adjust the resonantfrequency near the optimum operating frequency.(4) We finish structural modeling, meshing，modal analysis and frequency responseanalysis by using MSC. Patran, MSC. Nastran. The purpose of simulating is comparingthe frequency response curve with the curve obtained by Chapter III trial. Littledifference between the two curves can explain the finite element modeling method iseffective. Obtain many resonant frequency curves by changing the size of the structureof the transducer. According to the curve obtain the optimal size to complete theoptimization purpose of this paper.