Apparatus and method for simultaneous drilling and casing wellbores
US6419033B1 · kind B1 · utility
188Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2000 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Dec 8, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1014
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides apparatus and method for drilling a wellbore wherein a pilot wellbore section is drilled with a bit which section is enlarged by a trailing underreamer to the desired size. One or more steering sections between the underreamer and the drill bit are utilized for maintaining and changing the drilling direction. Each steering section includes a plurality of independently adjustable force application devices on a non-rotating sleeve. If an expandable liner is used, then an expansion device disposed above the underreamer expands the liner during retrieval of the drilling assembly to the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.