Active magnetic azimuthal toolface for vertical borehole kickoff in magnetically perturbed environments
US9938773B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2015 |
| Grant date | Apr 10, 2018 |
| Priority date | — |
| Expiry date | Nov 26, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/0228
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An artificial toolface reference system includes a power supply providing current to a ground lead and a reference lead. A ground point is coupled to the ground lead and in electrical connection with the ground. A reference wellbore includes a reference conductor in electrical connection with the ground. The reference conductor is in electrical connection with the reference lead. A guidance sensor positioned outside the reference wellbore includes at least one magnetometer. The power supply may be used to provide a current through the reference conductor, the ground, and the ground point such that a reference magnetic field is generated along the reference conductor. The guidance sensor may measure the reference magnetic field with a magnetometer. An artificial magnetic toolface may be calculated therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.