Down hole excitation system for loosening drill pipe stuck in a well
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United States of America Patent
Stats
-
May 26, 1987
Issued Date -
N/A
app pub date -
Jan 31, 1986
filing date -
Mar 8, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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