Multi-array laterolog tools and methods with differential voltage measurements
US9547100B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2011 |
| Grant date | Jan 17, 2017 |
| Priority date | — |
| Expiry date | May 17, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2200/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Multi-array laterolog tool systems and methods acquire a set of array measurements sufficient to provide laterolog tool measurements of differing array sizes. Such systems and method offer multiple depths of investigation while offering greater measurement stability in borehole environments having high resistivity contrasts. In at least some system embodiments, a wireline or LWD tool body has a center electrode positioned between multiple pairs of guard electrodes and a pair of return electrodes. The tool's electronics provide a current from the center electrode to the pair of return electrodes and currents from each pair of guard electrodes to the pair of return electrodes. Each of the currents may be distinguishable by frequency or distinguishable by some other means. This novel arrangement of currents provides a complete set of measurements that enables one tool to simultaneously emulate a whole range of laterolog tools.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.