Devices for drilling branched wells
US4800966A · kind A · utility
14Cited by
8References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Apr 30, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B41/0035
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A device for drilling lateral boreholes from a cased parent well comprises selecting and coupling means adapted to cooperate with a deflection unit placed within the parent well. The selecting and coupling means are mounted at the lower end of an extension unit formed by interassembled tubular elements. The upper end of the extension unit is rigidly fixed to a suspension swivel within the wellhead and at least one slip joint is interposed between two tubular elements. The internal diameter of each tubular element is such that a drilling packer can be housed within the tubular elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.