Method and apparatus for active suppression of pipe signals in transient electromagnetic measurements
US10261210B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 9, 2016 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Jan 5, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/024
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods and systems for estimating properties of formations including conveying a carrier through a borehole having a first transmitter, a second transmitter collocated with the first transmitter, a first receiver, and a second receiver, the first receiver positioned a first distance from the first transmitter and the second receiver positioned a second distance therefrom, generating a transient electromagnetic field with the first transmitter, generating a suppression signal with the second transmitter, the suppression signal configured to suppress a response received by the first and second receivers that is caused by the transient electromagnetic field interacting with the carrier, measuring a signal with suppressed pipe signal at the first and second receivers, the measured signal representing the formation response to the transient electromagnetic field, estimating a formation property from the measured signal to select a model, and adjusting a drilling operation based on the estimated property of the formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.