Patent · US Active

System and method for drilling a subsea well

US8978774B2 · kind B2 · utility

10Cited by

4References

26Claims

0Family size

Assignee

Ocean Riser Systems AS · NO

Inventors

Borre Fossli · Oslo, NO
Sigbjorn Sangesland · Trondheim, NO

Key dates

Filing date	Nov 10, 2010
Grant date	Mar 17, 2015
Priority date	—
Expiry date	Oct 9, 2031

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B43/38
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A subsea mud pump can be used to return heavy drilling fluid to the surface. In order to provide a less stringent requirement for such a pump and to better manage the bottom hole pressure in the case of a gas kick or well control event, the gas should be separated from the drilling fluid before the drilling fluid enters the subsea mud pump and the pressure within the separating chamber. The mud pump suction should be controlled and kept equal or lower than the ambient seawater pressure. This can be achieved within the cavities of the subsea BOP by a system arrangement and methods explained. This function can be used with or without a drilling riser connecting the subsea BOP to a drilling unit above the body of water.

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