Dual-member pipe joint for a dual-member drill string
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United States of America Patent
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Sep 19, 2017
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N/A
app pub date -
Jul 26, 2013
filing date -
Jul 26, 2012
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Abstract
A torque-transmitting connection for a dual-member drill string. An elongate inner ember of a dual-member pipe is disposed within an outer member and rotatable independent of the outer member. The inner member comprises a geometrically-shaped pin end and a box end having a geometrically-shaped opening. The geometrically-shaped opening of the box end has at least one internal angle greater than 180 degrees. The pin end of the inner member may be inserted into the box end of an adjacent similarly formed inner member to form an inner member pipe joint. The configuration of the pin end and the box end allows the pin end and the box end to be in connector free torque-transmitting engagement but also provides clearance for potential misalignment of the pin end and the box during make-up of an inner member drill string.
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