Patent · US Expired

Apparatus and method for cleaning and sealing a well borehole portion for formation evaluation

US6957709B2 · kind B2 · utility

0Cited by

8References

16Claims

0Family size

Assignee

Baker Hughes Holdings LLC · US

Inventors

Matthias Meister · Celle, DE
Wolfgang E. Herberg · Waggum, DE
Sven Krueger · Trossingen, DE

Key dates

Filing date	Feb 4, 2004
Grant date	Oct 25, 2005
Priority date	—
Expiry date	Feb 4, 2024

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B37/00
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A borehole wall cleaning apparatus and method for obtaining an improved seal between a fluid sampling device and a portion of the borehole wall. Clean drilling fluid is pumped into a drilling tool using a mud pump. A fluid diverter in the tool diverts all or part of the clean drilling fluid through a port to clear a portion of a borehole wall. A sealing pad is moved against the clean portion. A sampling port is exposed to the sealed portion for sampling and/or testing fluid from the formation.

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