Method for preventing annular fluid flow using tube waves

Details Method for preventing annular fluid flow using tube waves Method for preventing annular fluid flow using tube waves

1992-11-25

1994-11-08

Neuder, William P.

Wells

Processes

Vibrating the earth or material in or being placed in the...

166286, E21B 3314

Patent

active

053618378

ABSTRACT:
The current invention is an improved method for preventing annular fluid flow following primary cementing of a casing string in a wellbore. The method involves injecting high pressure pulses of a working fluid into a liquid-filled casing string to produce tube waves that will propagate through the casing liquid until they encounter a casing restriction or barrier. This encounter vibrates the casing string. Vibration of the casing string helps to maintain the pressure of the cement slurry at or above the pressure of fluids in the surrounding formations, thereby preventing or reducing annular fluid flow.

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Cooke, C. E., Gonzalez, O. J. and Broussard, D. J., "Primary Cementing Improvement by Casing Vibration During Cement Curing Time", SPE 14199, presented at the 60th Annual Technical Conference and Exhibition of the SPE held in Las Vegas, Nev., Sep. 22-25, 1985.

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