Hydraulic oil well pumping apparatus
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United States of America Patent
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Apr 11, 2017
Grant Date -
Jul 17, 2014
app pub date -
Jan 14, 2014
filing date -
Jan 14, 2013
priority date (Note) -
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Abstract
A hydraulic oil well pumping arrangement employs a compensating type hydraulic pump, a directional valving arrangement and a proportioning valving arrangement. When the directional valve is energized, oil is directed to the rod end of the hydraulic cylinder. In one embodiment, a time delay halts the movement of the sucker rod or pumping string to allow accumulation of oil in a slow following well. In another embodiment, the pumping string rapidly falls to the bottom of the stroke in order to shake or jar debris from the string.
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