Apparatus and method for controlling a part of a downhole assembly, and a downhole assembly
US9834994B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jun 11, 2013 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | Feb 12, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
This invention relates to an apparatus and method for controlling a part of a downhole assembly, and to the downhole assembly. The downhole assembly may include a steering mechanism adapted to steer a drill bit in a chosen direction, and the steering mechanism may be the part of the downhole assembly which is controlled by the apparatus. The downhole assembly includes a drill bit and a motor, the motor having a stator and a rotor, the rotor being driven to rotate relative to the stator by the passage of a drilling fluid along a drilling fluid path between the rotor and the stator. The motor has a conduit through which the drilling fluid can pass, the conduit being separate from the drilling fluid path, and the apparatus has a valve to control the flow of drilling fluid through the conduit. The invention provides a robust and reliable means of delivering high pressure drilling fluid downstream of the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.