Non-invasive measurement of fluid-pressure diffusivity using electro-osmosis
US7150188B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2004 |
| Grant date | Dec 19, 2006 |
| Priority date | — |
| Expiry date | May 13, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2015/1027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for determining fluid-pressure diffusivity in a borehole (12) in a formation (10) includes an electrode (16) and a strain measuring device (18),(20) (or a particle velocity measuring device (18),(20) or a particle acceleration measuring device (18),(20)) disposed a fixed distance from the electrode (16). The electrode (16) injects an electrical current into a point on a wall of the borehole (12). The strain measuring device (18),(20) measures strain (or the particle velocity measuring device (18),(20) measuresd particle velocity or the particle acceleration measuring device (18),(20) measures particle acceleration) at the fixed distance from the point of injection of the electrical current over time. The fluid-pressure diffusivity is determined based on the measured strain (or measured particle velocity or measured particle acceleration) over time. A method of determining a fluid-pressure diffusivity in a borehole (12) includes injecting an electrical current into a point on a wall of the borehole (12), measuring at least one of strain, particle velocity, and particle acceleration at a fixed distance from the point of injection of the electrical current over time, and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.