DRILL RIG AND METHODS FOR DIRECTIONAL DRILLING
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United States of America Patent
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Issued Date -
Oct 1, 2015
app pub date -
Mar 25, 2015
filing date -
Mar 26, 2014
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Abstract
A device for measuring inclination is suspended to a cable passing through a duct formed in the rods of the drill string. A mechanism for winding and unwinding the cable allows to raise and drop the measuring device within the lowermost rod, engaging it with or disengaging from a mule shoe. This is performed without the need to unscrew the rods and open the string. A valve element may close the duct through which the cable passes. In one embodiment, directional drilling is performed supplying low pressure fluid through tubular rods having a single duct. In another embodiment, high pressure fluids are supplied through rods having two or more coaxial ducts.
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