Pumping by martensitic transformation utilization
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United States of America Patent
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-
Sep 18, 1984
Grant Date -
N/A
app pub date -
Jan 22, 1982
filing date -
Jan 22, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Pumping in oil wells and like power conversion applications is carried out in an economical manner with efficient utilization of energy and low capital cost by pushing or pulling the plunger mechanism (of conventional type) with a metal wire, rod or tube arranged as a helical coil spring and constructed of a material that exhibits shape memory effect. This is accomplished by cyclically first straining the helical coil by loading it with a mechanical load and thus causing a structural transformation or martensitic transformation in the material and then upon the application of heat thereto (by electrical self heating or an external heater in proximity thereto), reversing the transformation to contract in material length with a fractional multiplier effect on contraction in length of the helical coil to raise the plunger, the coil having an expanded to compressed length ratio of 2:1 or substantially greater.
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