Patent · US Expired

Closed-loop drawdown apparatus and method for in-situ analysis of formation fluids

US6609568B2 · kind B2 · utility

81Cited by

5References

29Claims

0Family size

Assignee

Baker Hughes Holdings LLC · US

Inventors

Volker Krueger · Celle, DE
Matthias Meister · Celle, DE
John M. Michaels · Irvine, US
Jaedong Lee · Katy, US
Stanley C. Jones · Littleton, US

Key dates

Filing date	Jul 20, 2001
Grant date	Aug 26, 2003
Priority date	—
Expiry date	Jul 20, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG01V11/002
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

An apparatus and method capable of incrementally decreasing the borehole pressure at a variable rate by controlling a test volume within the borehole. The system includes an incrementally controllable pump, closed loop feedback and a controller for drawing down the pressure of a test volume to a level just below formation pressure. This incremental drawdown system will significantly reduce the overall measurement time, thereby increasing drilling efficiency and safety.

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