Downhole probe assembly

Details Downhole probe assembly Downhole probe assembly

2005-05-20

2009-10-20

Raevis, Robert R (Department: 2856)

Measuring and testing

Borehole or drilling

Fluid flow measuring or fluid analysis

Reexamination Certificate

active

07603897

ABSTRACT:
A downhole, extendable apparatus and methods of use are described and claimed herein. In one embodiment, the extendable apparatus includes a piston that extends toward a borehole wall, the piston having an inner sampling member that is also extendable. The sampling member may be further extended to engage the borehole wall and penetrate the formation. The sampling member may also include a screen and an inner scraper or wiper that frictionally engages the screen and reciprocates to remove debris from the screen. The piston may comprise a seal pad having an internal cavity for receiving a volume of fluid. In another embodiment, the extendable apparatus comprises multiple, concentric pistons for extending the sampling member further toward the borehole wall than is possible with a single piston. The extendable apparatus may also include a retraction contact switch and position indicator.

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