Acoustic isolator between downhole transmitters and receivers

Details Acoustic isolator between downhole transmitters and receivers Acoustic isolator between downhole transmitters and receivers

G - Physics

01

V

G01V 1/52 (2006.01)

Patent

CA 2568326

Apparatus and methods for acoustically isolating logging tool receiver and transmitter sections. One or more modular isolators is arranged between the receiver and transmitter sections. The modular isolators comprise a high tensile strength while also providing for a high wave attenuation level. The modular isolators are mechanical mass-spring systems capable of absorbing acoustic waves propagating along the logging tool. The mass is a swinging sleeve, and the spring includes a Belleville spring stack. The use of the strong modular isolators provides acoustic isolation between the transmitters and receivers for the complete sonic frequency band at multiple modes.

L'invention concerne un appareil et des procédés d'isolation acoustique de sections d'émission et de réception d'un appareil de diagraphie. Un ou plusieurs isolateurs modulaires sont disposés entre les sections de réception et d'émission. Ces isolateurs modulaires présentent une résistance à la traction élevée, et permettent d'obtenir un niveau d'atténuation des ondes élevé. Les isolateurs modulaires sont des systèmes masse-ressort mécaniques pouvant absorber les ondes acoustiques se propageant le long de l'appareil de diagraphie. La masse est un manchon souple, et le ressort comprend un ensemble de ressorts Belleville. L'utilisation d'isolateurs modulaires forts permet l'isolation acoustique entre les émetteurs et les récepteurs pour la bande de fréquence acoustique totale selon de multiples modes.

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