Wells – Processes – Freeing stuck object – grappling or fishing in well
Patent
1986-01-31
1987-05-26
Leppink, James A.
Wells
Processes
Freeing stuck object, grappling or fishing in well
175 56, E21B 3116
Patent
active
046677429
ABSTRACT:
The location of a section of drill pipe which has become stuck in a well some distance from the surface is first determined. The drill string above this location is unfastened from the drill string and removed from the well. A mechanical oscillator is connected to the bottom of the re-installed drill string through a sonic isolator section of drill pipe designed to minimize transfer of sonic energy to the sections of drill string above the oscillator. The oscillator is connected to the down hole stuck drill pipe section for transferring sonic energy thereto. A mud turbine is connected to the oscillator, this turbine being rotatably driven by a mud stream fed from the surface. The turbine rotates the oscillator to generate sonic energy typically in a torsional or quadrature mode of oscillation, this sonic energy being transferred to the stuck section of drill pipe to effect its freeing from the walls of the well.
REFERENCES:
patent: 3155163 (1964-11-01), Bodine, Jr.
patent: 3168140 (1965-02-01), Bodine, Jr.
patent: 3633688 (1972-01-01), Bodine
patent: 4261425 (1981-04-01), Bodine
patent: 4271915 (1981-06-01), Bodine
Leppink James A.
Melius Terry Lee
Sokolski Edward A.
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