Oil-well pumping system or the like
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United States of America Patent
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-
Jul 18, 1989
Grant Date -
N/A
app pub date -
Feb 23, 1988
filing date -
Feb 23, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention involves pressure-counterweighted oil-well pumping apparatus in which derrick structure of elemental simplicity involves components which are readily assembled and disassembled, such that a given pumping apparatus can be loaded on a single truck and transported from one to the next desired well-pumping location. For a given capacity pumping system, overall height requirements for the derrick structure are less than one half those of U.S. Pat. No. 4,631,918. And power-integrator complexity is substantially reduced by employment of a fixed-displacement variety in conjunction with a variable speed a-c motor as the prime mover, under control of solid-state devices and pressure-sensitive transducer elements which determine upper and lower limits of the reciprocating stroke.
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