Method for offshore drilling utilizing a two-riser system
US5184686A · kind A · utility
78Cited by
18References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 3, 1991 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | May 3, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/035
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for drilling offshore wells in deep water with greater safety and with fewer casing strings, maintaining a maximum diameter wellbore in the early stages of drilling to facilitate casing operations in and beyond deviated sections, and providing full well control while setting surface casing. This method utilizes a two-riser system for drilling in which the surface casing interval is run and set within a large diameter, light duty riser. Thereafter, drilling proceeds with a heavy duty riser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.