Method for determining hydraulic properties of formations surrounding a borehole
US5247830A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1991 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Sep 17, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/008
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods for determining hydraulic properties of a formation surrounding a borehole are disclosed. The methods use a borehole tool preferably having a first probe for injecting fluid into a formation or obtaining fluid from the formation, a second probe vertically displaced relative to the first probe, and a third probe azimuthally displaced relative to the first probe. The method generally comprises: varying the pressure at the first probe of the borehole tool; measuring pressures at the second and third probes resulting from the varying of pressure at the first probe; and utilizing the pressures measured at the second and third probes to determine values over time of a function related to the hydraulic properties of the formation. This function is a function of the geometry and rock and fluid properties of the formation but is independent of the manner in which the pressure is varied at the first probe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.