Pressure/temperature compensated transducer pad assembly
US4928031A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1986 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Nov 25, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N29/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention is directed to a device which simply and efficiently compensates for changes in the volume of a fluid trapped in a fluid-filled cavity between two relatively immovable housings and an elastomeric seal ring. The present invention is particularly useful in an acoustic transducer pad assembly designed for installation on logging tools used in deep boreholes in the oil and gas industry where high temperatures and pressures are experienced at downhole locations. In a presently preferred embodiment, the device comprises a transducer unit housing fixedly secured to a metal wear pad housing with an elastomeric seal disposed therebetween to define a fluid-filled cavity between adjacent portions of the housings and the seal. The seal is disposed in a groove of sufficient size to permit the required lateral expansion and contraction by deformation or extrusion of the seal in order to compensate for the expected changes in the volume of the fluid-filled cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.