Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells
US7264058B2 · kind B2 · utility
53Cited by
6References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 10, 2002 |
| Grant date | Sep 4, 2007 |
| Priority date | — |
| Expiry date | Apr 4, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/085
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An arrangement and a method to control and regulate the bottom hole pressure in a well during subsea drilling at deep waters: The method involves adjustment of a liquid/gas interface level in a drilling riser up or down. The arrangement comprises a high pressure drilling riser and a surface BOP at the upper end of the drilling riser. The surface BOP havs a gas bleeding outlet. The riser also comprises a BOP, with a by-pass line. The drilling riser has an outlet at a depth below the water surface, and the outlet is connected to a pumping system with a flow return conduit running back to a drilling vessel/platform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.