Retrievable whipstock system
US5474126A · kind A · utility
81Cited by
42References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 1994 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | May 16, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B29/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A whipstock assembly is provided for lowering within a cased wellbore, cutting a window through a casing for drilling a sidetrack borehole, and retrieving with conventional fishing tools. The whipstock assembly includes two separate whipstocks having different tapers, and which are releasibly coupled for separately retrieving from the cased wellbore. A barrier member is provided to prevent a tapered face of one of the whipstocks from wedging debris between the whipstock and the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.