Patent · US Active

Riserless, pollutionless drilling system

US9062498B2 · kind B2 · utility

3Cited by

8References

4Claims

0Family size

Assignee

Ocean Riser Systems AS · NO

Inventors

Paul Anthony Potter · Montefiascone, IT
Svein Gleditsch · Harstad, NO

Key dates

Filing date	Jul 29, 2011
Grant date	Jun 23, 2015
Priority date	—
Expiry date	Mar 22, 2032

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B33/085
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

The invention provides a drilling system for drilling subsea wells from a floating mobile offshore drilling unit (MODU), the system comprising a subsea BOP. The system is distinctive in that the subsea BOP has relative small weight and size, the system includes no marine riser but the system comprises: flexible choke and kill lines arranged between the subsea BOP and the MODU, means for drill string guidance and cleaning, for guiding when inserting or taking out a drill string from the BOP and for drill string cleaning when pulling the drill string out from the BOP, means for controlled leakage of seawater into a recovery funnel arranged below the means for drill string cleaning but above the BOP, and means for return from the recovery funnel to the MODU of drilling fluid and seawater leaked into the recovery funnel.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.