Patent · US Active

Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells

US8322439B2 · kind B2 · utility

4Cited by

43References

22Claims

0Family size

Assignee

Ocean Riser Systems AS · NO

Inventor

Borre Fossli · Oslo, NO

Key dates

Filing date	Nov 29, 2011
Grant date	Dec 4, 2012
Priority date	—
Expiry date	Nov 29, 2031

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 has 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.