Research On Matching Layer Of Downhole Impulsive Sound Soure Receiver Transducer

Downhole impulse acoustic source deep detection receiving transducer is the impulse wave energy receiving instrument in the drilling and logging instrument,and its performance has a crucial impact on the exploration results.Impulsive waves will be reflected and refracted in the process of propagation between different media,resulting in the attenuation and distortion of signal energy,acoustic matching layer as a common means of acoustic impedance matching,is widely used in the direction of the transducer.In order to improve the reception performance of the impulsive source receiving transducer,this thesis conducts acoustic matching layer research.In this study,the effect of the number of acoustic matching layers on the transmittance of impulse energy is firstly studied from the acoustic characteristics of acoustic matching layers.The effect of the acoustic matching layer on the reception performance of the impulse source receiving transducer under different conditions is studied.Secondly,the sensitivity of the receiver transducer is observed by changing the structural parameters of the acoustic matching layer,and the results show that the best reception performance is achieved when the length and width of the rectangular acoustic matching layer are the same as those of the impulsive source receiver transducer.Finally,a table-shaped acoustic matching layer structure is proposed,which can further improve the receiving performance of the receiver transducer by expanding the contact area between the acoustic matching layer and the acoustic field compared with the traditional rectangular acoustic matching layer.The gradient acoustic matching layer structure is also proposed in combination with the impulsive source receiving transducer to lay the theoretical foundation for the development of a new direction of acoustic matching layer.