Active gap sub
US10975684B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2017 |
| Grant date | Apr 13, 2021 |
| Priority date | — |
| Expiry date | Jan 30, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and system for mitigating direct coupling. A method of mitigating direct coupling may comprise disposing an electromagnetic sensor system in a wellbore. The electromagnetic sensor system may include a receiver disposed on a conductive body and a gap sub disposed at another location on the conductive body. Exciting an electromagnetic source to inject an electrical current into a formation. Exciting the gap sub to achieve a small current condition at the selected point. Performing a first measurement at a receiver. Interpreting the first measurement to calculate a formation or pipe parameter and using the formation or pipe parameter to adjust at least one parameter of a well operation. A system of mitigating direct coupling may include a conductive body may comprise a gap sub, a controller, a voltage source, a receiver, and an information handling system. The information handling system may be operable to cancel current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.