Fluid driven screw type sonic oscillator-amplifier system for use in freeing a stuck pipe
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United States of America Patent
Stats
-
Apr 3, 1990
Issued Date -
N/A
app pub date -
Jan 19, 1989
filing date -
Jul 27, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A Moyno type oscillator having a screw shaped rotor and stator is lowered down by means of a cable within a section of drill pile which has become stuck in a bore hole. The rotor of the oscillator is rotatably driven by means of a liquid stream at a speed such as to generate vibrational energy in the oscillator housing at a sonic frequency. The cable from which the oscillator is suspended has swivel bearings installed therein to permit the oscillator housing to rotate from the cable. The vibrational energy generated in the oscillator housing causes the housing to rotate precessionally around the inside wall of the stuck section of drill pipe to thus generate amplified lateral quadrature vibrational energy in the drill pipe to shake it loose from the bore hole.
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