Patent · US Active

Reverse circulation pressure control method and system

US8132630B2 · kind B2 · utility

9Cited by

19References

14Claims

0Family size

Assignee

Baker Hughes Holdings LLC · US

Inventors

Sven Krueger · Trossingen, DE
Volker Krueger · Celle, DE
Jens-Uwe Bruns · Burgdorf, DE
Roger Fincher · Conroe, US
Larry Watkins · Houston, US
Peter Aronstam · Houston, US
Peter Fontana · London, GB

Key dates

Filing date	Mar 29, 2007
Grant date	Mar 13, 2012
Priority date	—
Expiry date	Aug 6, 2028

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B21/085
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A system for reverse circulation in a wellbore includes equipment for supplying drilling fluid into the wellbore bit via at least an annulus of the wellbore and returning the drilling fluid to a surface location via at least a bore of a wellbore tubular. The system also includes devices for controlling the annulus pressure associated with this reverse circulation. An active pressure differential device may increase the pressure wellbore annulus to at least partially offset a circulating pressure loss. Alternatively, the system may include devices for decreasing the pressure in the annulus of the wellbore.

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