Acoustic isolator for acoustic well logging tool

Details Acoustic isolator for acoustic well logging tool Acoustic isolator for acoustic well logging tool

G - Physics

01

V

G01V 1/52 (2006.01) G01V 1/44 (2006.01) G10K 11/16 (2006.01)

Patent

CA 2262629

An acoustic well logging tool (11) is shown having a transmitter section (17) and a receiver section (19) spaced apart by a semi-rigid housing (21). The semi-rigid housing (21) includes a number of rigid tubular members (27, 29) which are joined by interlocking lobes (33, 35) which permits relative movement between the tubular members but which prevents the separation thereof. Gaps (49) between the interlocking lobes (33, 35) are filled with a connecting material which differs significantly in acoustic impedance from the material of the remainder of the housing, whereby acoustic energy passing from the transmitter section (17) along the body of the tool is delayed and attenuated.

Cet instrument de diagraphie acoustique (11) des puits présente une section émettrice (17) ainsi qu'une section réceptrice (19), espacées l'une de l'autre par un boîtier semi-rigide (21) comportant un certain nombre d'éléments tubulaires rigides (27, 29), assemblés par des lobes (33, 35) qui s'emboîtent les uns dans les autres et permettent un déplacement relatif entre les éléments tubulaires tout en empêchant la séparation de ceux-ci. Des espaces (49) entre les lobes (33, 35) sont remplis d'un matériau de raccordement différant grandement dans son impédance acoustique de celle du matériau du reste du boîtier, ce qui permet à l'énergie acoustique, partant de la section émettrice (17) et circulant le long du corps de l'instrument, d'être retardée et atténuée.

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