Method and apparatus for detection and quantification of borehole standoff
US9664812B2 · kind B2 · utility
0Cited by
2References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 15, 2013 |
| Grant date | May 30, 2017 |
| Priority date | — |
| Expiry date | Jul 19, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of quantifying borehole properties, comprising: injecting an electric current from an outer button and an inner button disposed on an equipotential pad into a subterranean formation surround by the borehole, measuring an apparent conductivity or a scaled current for each button, modeling the measurements at a sequence of standoff locations, and, using an inversion technique to determine at least one of the following borehole properties: mudcake thickness, mudcake resistivity, diameter of invasion, flushed zone resistivity and true formation resistivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.