Patent · US Expired

Two stage downhole drilling fluid filter

US6715570B1 · kind B1 · utility

14Cited by

32References

21Claims

0Family size

Assignee

Schulumberger Technology Corporation · US

Inventors

Geoff Downton · Minchinhampton, GB
Christian Menger · Recke, DE
Henry Phan · Richmond, US

Key dates

Filing date	Sep 17, 2002
Grant date	Apr 6, 2004
Priority date	—
Expiry date	Sep 17, 2022

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B21/002
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A two stage filter for drilling fluid using downhole tools filters solid materials from the drilling fluid and has a first, outer filter section and a second, inner filter section. A portion of the drilling fluid flowing through the first section is received by the second section, and passed on to the fluid using device of the tool. A flow area of the first filter section is greater than a flow area of the second filter section.

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