Measuring device for a seismic profile within a well-bore
US4811814A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Jan 29, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/911
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring device for a seismic profile within a well-bore includes resilient members such as springs which are flexible in at least two directions and are interposed between a geophone and a rigid arm connected to a measuring-tool body for applying the geophone against the wall of the well-bore during each detection of seismic waves generated at the ground surface. The elasticity of the resilient members is at least equal to the elasticity of the subsurface stratum through which the well-bore extends. The resonance frequency of the mass of the geophone with the resilient members is equal at a maximum to the resonance frequency defined by the geophone mass and elasticity of the subsurface stratum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.