Annular pump
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United States of America Patent
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-
May 23, 2000
Grant Date -
N/A
app pub date -
Sep 12, 1997
filing date -
Sep 12, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pump having a semi-rigid flexible outer tube with a sealed top and a sealed bottom, check valves at the top and bottom such that the outer tube is in fluid communication with the working fluid, an inner tube concentrically disposed within the outer tube, and a controlled source that applies pressure to expand the inner tube to apply a force to the working fluid in the annulus defined by the inner and outer tubes is used to pump viscous materials and/or slurries from the bottom of small diameter wells. The tubes are made from nonmetallic, elastic materials and can be inexpensively manufactured.
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