Articulated directional drilling motor assembly
US5727641A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1996 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Aug 5, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/068
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An articulated directional drilling tool assembly for use in drilling a borehole having a short radius of curvature includes a mud motor having an upper housing that is pivotally connected to a lower housing having upper and lower sections. Such sections are joined together in a manner to define a bend angle. The drill bit box carries a stabilizer that centers it in the borehole. The upper housing section carries an eccentric stabilizer assembly which tilts it toward the low side of the borehole to increase the effectiveness of the bend angle. A hydraulic piston also can be used to increase the side loading on the bit and cause it to drill a sharply curving borehole. The upper housing of the motor is connected to the lower housing by an articulative, torque transmitting coupling, and the upper motor housing is connected to an orientation measuring sub thereabove in the same manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.