Evaluating properties of porous formations
US5220504A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Aug 16, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/008
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The properties of porous material that is hydraulically coupled to a well through openings in cased or in uncased portions of the well are evaluated. The process involves initiating a pressure wave, typically at the well head, so that the pressure oscillations extend to the porous material zone under investigation. Flow of fluid between the well and formation changes the amplitude and frequency content of the oscillations traveling up and down the well. That is, the oscillations are modulated from the form they would have in a like well with no hydraulic communication to the formation. The properties of the formation are derived from these changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.