Pressure converter
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United States of America Patent
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-
Aug 10, 1999
Grant Date -
N/A
app pub date -
Apr 8, 1997
filing date -
Oct 12, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Pressure amplifier mounted at the lower end of a drill pipe for deep drilling to generate an increased fluid pressure. A piston with a pressure stroke and a return stroke between end positions in a cylinder has a large piston area which during the pressure stroke is subjected to the drilling fluid pressure, a first opposite piston area and a second opposite and small piston area which during the pressure stroke generates an increased pressure in a smaller portion of the drilling fluid flow. A valve arrangement controls drilling fluid flows to and from the piston. For each end position of the piston there is provided at least one moveable valve control element which is adapted to be moved by the piston at either end position, in order to activate the valve arrangement.
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