Early evaluation formation testing system

Details Early evaluation formation testing system Early evaluation formation testing system

1996-08-19

1998-08-11

Neuder, William P.

Wells

Packers or plugs

Expanded by confined fluid from central chamber, pump or...

166191, 166319, F21B 33127

Patent

active

057914141

ABSTRACT:
A formation testing system provides the ability to reliably and repeatedly perform tests, such as drawdown tests, on closely spaced apart formations intersected by subterranean wellbores without relying on absolute fluid pressure for actuation thereof. In a preferred embodiment, a formation testing system is alternately configured for normal drilling operations or for fluid sampling operations by applying preselected differential pressures to the system. In a representatively illustrated preferred embodiment, a formation testing system has opposing pistons which cooperate with uniquely configured ratchet mechanisms to change the system's configuration in response to changes in differential pressure applied thereto.

REFERENCES:
patent: 4361195 (1982-11-01), Evans
patent: 4877086 (1989-10-01), Zunkel
patent: 5101904 (1992-04-01), Gilbert
patent: 5383520 (1995-01-01), Tucker et al.
patent: 5404946 (1995-04-01), Hess
patent: 5649597 (1997-07-01), Ringgenberg

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