Method for determining formation permeability by comparing measured tube waves with formation and borehole parameters
US4797859A · kind A · utility
13Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 8, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Jun 8, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining the fluid mobility or permeability of subsurface formations using borehole measurements of the tube wave. The slowness of an hypothetical tube wave travelling in an elastic, nonpermeable medium is computed based on various measured parameters such as the formation matrix density, fluid density and fluid acoustic slowness. This elastic model slowness is subtracted from the measured tube wave slowness of a selected formation traversed by the borehole, and the difference is used to determine the formation permeability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.