Double bend positive positioning directional drilling system
US5094304A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 24, 1990 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Sep 24, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/068
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A selectively adjustable double bend positive positioning directional drilling system for kickoff from a main well bore to change the directiion of drilling. The tool is selectively adjustable to facilitate running into the vertical well bore and subsequently to provide an aggressive build rate upon kickoff. The tool string incorporates a pair of kickoff pads--a lower fixed pad and an upper rotatively adjustable pad. As the tool is run into the well bore the adjustable pad is oriented away from the bend in the motor housing. Once in the hole, the string would be rotated relative to the adjustable pad by the reactive torque of the downhole motor and locked in the desired orientation. The adjustable pad incorporates an internal slot system to guide rotation and lock the pad in position. Alternatively, a single arm underreamer-type assembly could be used as the upper kickoff pad.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.