The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 10, 1989
Filed:
Jul. 18, 1988
Albert H Wignall, Friendswood, TX (US);
David C Hoyle, Houston, TX (US);
Schlumberger Technology Corporation, Houston, TX (US);
Abstract
A sonic isolation joint (SIJ) of a sonic well logging tool is disposed between a sonic transmitter section and a sonic receiver section of the tool and attenuates compressional and flexural waves which propagate longitudinally along an axis of the tool when the sonic transmitter transmits a pressure wave into a formation of a borehole. The SIJ comprises a first outer housing, a second outer housing, an inner housing disposed within the first and second outer housings, a first attenuation member disposed between the first outer housing and the inner housing and a second attenuation member disposed between the second outer housing and the inner housing, each of the attenuation members including a plurality of rubber isolating washers, and a plurality of steel washers interleaved with the plurality of rubber isolating washers. The attenuation members are each fit between a flange of the outer housing and a flange of the inner housing and are compressed when the sonic dipole tool string is lowered into the borehole.