Process and drilling equipment for sinking a well in underground rock formations
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United States of America Patent
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Apr 27, 1993
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N/A
app pub date -
Jul 30, 1991
filing date -
Jul 30, 1990
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Abstract
The present invention is a drilling tool including a telescoping assembly for transmitting hydraulic force to the drill bit at the bottom of the tool. The internal hydraulic characteristics of the tool may be varied to vary the force through extension and retraction of the telescoping assembly.
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