System and methods for obtaining compensated electromagnetic measurements
US10302805B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 26, 2015 |
| Grant date | May 28, 2019 |
| Priority date | — |
| Expiry date | Jul 21, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for making downhole electromagnetic logging while drilling measurements includes rotating an electromagnetic logging while drilling tool in a subterranean wellbore. The logging while drilling tool includes at least first and second tilted transmitter antennas longitudinally spaced along a logging while drilling tool body and at least first and second tilted receiver antennas. A plurality of electromagnetic voltage measurements is acquired at the first and second tilted receiver antennas while rotating and processed to compute harmonic voltage coefficient. Ratios of selected ones of the harmonic voltage coefficients are then processed to compute at least one gain compensated measurement quantity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.