Sonic logging tool including receiver and spacer structure

Details Sonic logging tool including receiver and spacer structure Sonic logging tool including receiver and spacer structure

G - Physics

01

V

G01V 1/52 (2006.01)

Patent

CA 2429182

A formation logging tool having a substantially continuous central mandrel with regularly spaced mass blocks disposed thereon, at least some of the mass blocks carrying sensors such as receivers. By adopting this structure, the tool can be made to behave as a mass-spring structure and its flexural and extensional behaviour controlled such that its dispersion curve does not extend into the dispersion curve of the formation to be logged. The structure can be applied to the whole of the logging tool or just to the receiver section and/or any spacer section between the receiver and the transmitter section.

Cette invention se rapporte à un outil de diagraphie pour formations souterraines, qui comprend un mandrin central essentiellement continu sur lequel sont disposés des blocs de masse régulièrement espacés, au moins certains de ces blocs de masse portant des capteurs tels que des récepteurs. Grâce à cette structure, cet outil peut se comporter comme une structure masse-ressort et son comportement à la flexion et à l'extension peut être commandé, pour que sa courbe de dispersion ne se prolonge pas dans la courbe de dispersion de la formation faisant l'objet de la diagraphie. Cette structure peut être appliquée à la totalité de l'outil de diagraphie ou juste à la section récepteur et/ou à n'importe quelle section d'espacement comprise entre le récepteur et la section émetteur.

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