Dual member pipe joint for a dual member drill string
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United States of America Patent
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Oct 31, 2017
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N/A
app pub date -
May 5, 2015
filing date -
Jul 26, 2012
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Abstract
A dual member drill string having a plurality of dual member drill string sections for use in horizontal directional drilling operations. Each drill string section having an outer member and an inner member that is rotatable independently of the outer member. The outer member has a pin end and a box end. The inner member has a pin end disposed within the pin end of the outer member and a box end disposed within the box end of the outer member.
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