Method and tool for directional electromagnetic well logging
US10345477B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 2016 |
| Grant date | Jul 9, 2019 |
| Priority date | — |
| Expiry date | Nov 2, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present disclosure describes various antenna assemblies, each antenna coil being disposed about a tool body section in an antenna pathway. The antenna pathway passes through alternating grooves and lands. At least one of the grooves is disposed in the tool body section at a non-axial direction relative to the longitudinal axis of the tool body section. The antenna coil may be an axial coil or a tilted coil. Additional grooves oriented at axial direction may be disposed on the tool body section. Various methods include acquiring a plurality of data pairs using one or more antenna coils, each data pair comprising an induced signal at a receiver and a corresponding toolface angle using a tool including at least one antenna assembly, to generate a measurement including obtaining information about the directionality of the formation by calculating areas of an induced signal function approximated by the plurality of data pairs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.