A sonic well tool transmitter and receiver array including an attenuation and delay apparatus

摘要: A sonic well tool includes a transmitter array, including at least one monopole and dipole transmitter, receiver array for receiving pressure wave signals from surrounding borehole formation. first attenuation delay apparatus is positioned above the second below in tool. The an member comprising plurality of interleaved rubber metal like washers attenuating compressional flexural waves propagating along metal, center support rod to inner housing bellows section having corrugated shape thin transverse dimension delaying propagation array. mass loading rings outer up further tool, housing, also differential volume compensator changing quantity oil encapsulated accordance with changes temperature pressure. hydrophone sets, each set pair preferably two hydrophones disposed cross being opposite other section.