Gain-corrected measurements
US10371781B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2011 |
| Grant date | Aug 6, 2019 |
| Priority date | — |
| Expiry date | Feb 15, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21F3/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method to obtain gain-corrected measurements. A measurement tool having one or more arrays is provided, wherein the arrays include two co-located triaxial transmitters and two co-located triaxial receivers. Measurements are obtained using the transmitters and the receivers. Impedance matrices are formed from the obtained measurements and the impedance matrices are combined to provide gain-corrected measurements. The apparatus may alternatively be a while-drilling logging tool having one or more arrays, wherein each array comprises a transmitter, a receiver, and a buck, and wherein the signal received by the receiver is subtracted from the signal received by the buck or vice versa. A slotted shield may be incorporated into either embodiment of the tool. The slots may form one or more island elements. A material is disposed in the slots. The islands and shield body have complementary tapered sides that confine the islands within the shield body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.