Measuring and testing – Borehole or drilling – Formation logging
Patent
1996-04-10
1999-10-19
Noori, Max
Measuring and testing
Borehole or drilling
Formation logging
7315247, E21B 4700
Patent
active
059692413
ABSTRACT:
An earth formation tool measures pressure from within a borehole. A portion of the borehole wall is isolated from surrounding borehole fluids by placing a chamber of a borehole tool against the borehole wall. The chamber comprises a recess in an exterior surface of a borehole tool. Mudcake present on the isolated portion of the borehole wall is disintegrated by an ultrasonic transducer within the chamber. In this manner, there is no resistance to fluid flow from the chamber to the formation. A pressure gauge measures pressure of the chamber to indicate pressure of the earth formation. This approach can be used to make moving or stationary measurements of earth formation pressure.
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Venkitaraman, Adinathan, et al. "Ultrasonic Removal of Near-Wellbore Damage Caused by Fines and Mud Solids," SPE Drilling & Completion, Sep. 1995, pp. 193-195.
Gordon David P.
Jeffrey Brigitte L.
Noori Max
Schlumberger Technology Corporation
Smith Keith G.W.
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