Hydraulic drill string accumulator
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United States of America Patent
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Oct 11, 2005
Grant Date -
Feb 12, 2004
app pub date -
Nov 27, 2001
filing date -
Nov 27, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A hydraulic accumulator for use in a drill string having a fluid passage for supply of fluid to a hydraulic drill string tool is provided. The accumulator comprises a body provided with connecting means for connecting the accumulator to the drill string and an expansion chamber in fluid communication the fluid passage when the accumulator is connected to the drill string by the connecting means. The expansion chamber is expandable between a first volume and a second volume which is larger than the first volume. Further, the expansion chamber is provided with means for moving the expansion chamber from the first to the second volume upon a fluid pressure increase in the fluid passage and for moving the expansion chamber from the second to the first volume upon a pressure decrease in the fluid passage.
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