Formation tester with improved sample collection system

Details Formation tester with improved sample collection system Formation tester with improved sample collection system

1996-08-01

1999-08-10

Suchfield, George A.

Wells

Processes

Sampling well fluid

166 66, 166100, E21B 4910

Patent

active

059343745

ABSTRACT:
This invention provides a formation evaluation tool for collecting a formation fluid in a chamber at a predetermined pressure and for maintaining the pressure of the collected fluid at a desired level during the retrieval of the chamber to the surface. The formation fluid is pumped into the chamber while a piston exposed to the hydrostatic pressure maintains the chamber pressure at the hydrostatic pressure. During retrieval of the chamber, the pressure in the chamber is maintained at a predetermined level by pumping wellbore fluid to the piston. A control unit at the surface is utilized for controlling the operation of the formation tool.

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Waid, M.C., Proett, M.A., Chen, C.C., & Ford, W.T.; Improved Models for Interpreting the Pressure Response of Formation Testers; Society of Petroleum Engineers, Dallas, TX, 1991, pp. 889-904.

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