Rod string sonic stimulator and method for facilitating the flow from petroleum wells
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United States of America Patent
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Apr 4, 1989
Grant Date -
N/A
app pub date -
Mar 24, 1988
filing date -
Mar 24, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A close fitting piston of a material such as rubber is attached to the end of a rod string such as a sucker rod which is suspended inside a tubing string installed in an oil well. An orbiting mass oscillator is attached to the upper end of the rod string and is operated at a frequency such as to cause resonant standing wave vibration of the rod string. The piston member attached to the bottom end of the rod string is driven by the vibrational energy to in effect form an acoustical piston which is driven by the vibrational energy. This energy is coupled to the surrounding liquid and thence to the surrounding formation to effectively unclog the well and the casing string of contaminants which may be impeding the flow of effluent from the well. The piston means is made long enough so that it operates as an acoustic monopole with both ends of the piston being vibrationally in phase with the vibrational energy traveling in the surrounding liquid medium.
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