Drilling device having a controlled path
US4844178A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Mar 25, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1014
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The drilling device comprises at least two stabilizers (7a, 7b, 7c) spaced apart in the longitudinal direction of the set of rods. The pistons (17a, 17b, 17c) of these stabilizers are interconnected and include common members (35, 37) for creating a pressure drop in the drilling fluid. Actuating surfaces (19a, 19b, 19c) including ramps (40) and complementary parts interconnecting the ramps cooperate with finger members (20) for effecting the extension of the bearing plates (21). The ramps (40) and the complementary parts of the actuating surfaces of the stabilizers (7a, 7b, 7c) are aligned in the longitudinal direction and are such that for each stable successive position of the pistons (17a, 17b, 17c), the bearing plates (21) are in positions of extension constituting a combination different from the preceding one.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.