Patent · US Active

Downhole valve with pass through ID

US8118104B2 · kind B2 · utility

2Cited by

6References

16Claims

0Family size

Assignee

SMITH INTERNATIONAL, INC. · US

Inventors

Huward Paul Fontenot, Jr. · Spring, US
Robert J. Costo, Jr. · Diemelstraße, US
Richard David Peer · Katy, US

Key dates

Filing date	Jan 15, 2009
Grant date	Feb 21, 2012
Priority date	—
Expiry date	Feb 15, 2030

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B34/12
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A downhole valve assembly is attached to a drillstring and includes an upper drillstring connection, a lower drillstring connection, and a tubular body comprising a through bore, and further includes a weight activated mechanism configured to close the through bore when the drillstring is lifted.

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