Directional drilling device and method for calibrating same
US11306576B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 27, 2020 |
| Grant date | Apr 19, 2022 |
| Priority date | — |
| Expiry date | Jul 27, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/18
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A directional drilling device includes a housing, a drive shaft extending through the housing, a plurality of magnetic field sensors positioned in the housing and in signal communication with a control device also positioned in the housing, wherein the magnetic field sensors are configured to determine a magnetic interference declination influenced by a magnetic interference field as a magnetic interference flux density and to transmit a magnetic interference declination value corresponding to a magnetic interference flux density to the control device, and a directional control device coupled to the housing and controllable by the control device to control a position of the directional drilling device, wherein the control device is configured to generate a correction value based on the magnetic interference declination value, and wherein the correction value corresponds to a deviation of the magnetic interference flux density from a reference magnetic flux density measured at a reference standard.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.