Parameter analysis affecting the characteristics of sound insulation of gradient U-shaped groove structure

Abstract

There are drill collar mode waves propagating directly along the drill collar during logging while drilling, drill collar waves will seriously interfere with the received strata wave information, At present, the grooveting method is widely used in drilling instruments, and the effect on drilling collar wave suppression is obvious. In this paper, a new type of sound insulator with gradual U-shaped groove structure is designed to suppress drill collar waves, This paper uses theoretical analysis and simulation methods to study the model mechanics and acoustics two parts of the study. The results show that the uniform groove width basically not affect the mechanical properties of drill collar, The combined groove width parameters of groove depth and gradient groove will affect the mechanical properties. Pulsed sound source depth detection sound insulation device with gradient U-shaped groove structure, on the basis of ensuring the mechanical strength of drill collar, the sound wave attenuation of the drilling collar wave is more than that of the uniform groove structure sound insulation body, that is, the gradual U -shaped groove structure sound insulation body has better acoustic characteristics.