Method and apparatus for removing mudcake from borehole walls

Details Method and apparatus for removing mudcake from borehole walls Method and apparatus for removing mudcake from borehole walls

1996-04-10

1997-10-14

Tsay, Frank

Boring or penetrating the earth

Processes

Sampling of earth formations

175 59, 1661772, 1661776, E21B 4908, E21B 2800

Patent

active

056762135

ABSTRACT:
A portion of a borehole wall is isolated from surrounding borehole fluids by placing a chamber of a borehole tool against the borehole wall. The chamber comprises a cylindrical recess in an exterior surface of the borehole tool. The recess is open at one end to receive borehole fluids, and closed at the opposite end by a concave ultrasonic acoustic transducer. Mudcake present within the chamber and on the isolated portion of the borehole wall is disintegrated by the concave ultrasonic transducer. This approach can be used to remove mudcake from a borehole wall with a moving or stationary borehole tool.

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patent: 5595243 (1997-01-01), Maki, Jr. et al.
patent: 5602334 (1997-02-01), Proett et al.
Widener, M. Ward, "The Development of High-Efficiency Narrow-Band Transducers and Arrays," Journal of Acoustical Society of America, vol. 67, No., 3 (Mar. 1980), pp. 1052-1057.
"The Development of a Deep Submergence, Air-backed Transder," Journal Acoustical Society of America: Technical Notes and Research Briefs, vol. 80, No. 6 (Dec. 1986), pp. 1852-1853.
Venkitaraman, Adinathan, et al. "Ultrasonic Removal of Near-Wellbore Damage Caused by Fines and Mud Solids," SPE Drilling & Completion, Sep. 1995, pp. 193-195.

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