Patent · US Active

Method of controlling flow through a drill string using a valve positioned therein

US8069926B2 · kind B2 · utility

16Cited by

67References

18Claims

0Family size

Assignee

Andergauge Limited · GB

Inventors

Alan Martyn Eddison · York, GB
Hazel Farquhar · Aberdeen, GB

Key dates

Filing date	May 7, 2010
Grant date	Dec 6, 2011
Priority date	—
Expiry date	May 7, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/7839
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A downhole valve comprises a tubular body and a valve member. The valve member is normally closed and in the closed position may prevent or restrict passage of a working fluid through the body. The valve member is movable to an open position, a first working fluid pressure differential being necessary to move the valve member from the closed position and a lower second working fluid pressure differential being necessary to maintain the valve member in the open position.

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