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Title:
NESTED DUAL DRILL PIPE
Document Type and Number:
WIPO Patent Application WO/2013/104770
Kind Code:
A3
Abstract:
A dual drill pipe (11) includes a joint (10) of drill pipe having a pin end (14) and a box end (12). An inner tube (16) is disposed within an internal bore of the joint (10) of drill pipe. A retainer (18, 20) is disposed proximate each longitudinal end of the inner tube (16). A retaining feature (15, 19) is formed in an interior of the joint (10) of drill pipe proximate each longitudinal end. The retaining features (15, 19) are configured to engage a respective one of the retainers (18, 20) so that the inner tube (16) is held in longitudinally fixed relation to the joint (10) of drill pipe.

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Inventors:
ALHAUG ESPEN (NO)
HARALD SYSE (NO)
Application Number:
PCT/EP2013/050509
Publication Date:
January 16, 2014
Filing Date:
January 11, 2013
Export Citation:
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Assignee:
REELWELL AS (NO)
International Classes:
E21B17/18; E21B21/12; F16L9/18; F16L39/00
Domestic Patent References:
WO2003033955A12003-04-24
Foreign References:
US3998479A1976-12-21
US4012061A1977-03-15
US3970335A1976-07-20
US4067596A1978-01-10
US5423575A1995-06-13
US20090189358A12009-07-30
US4632406A1986-12-30
US4928999A1990-05-29
US4082323A1978-04-04
US5020611A1991-06-04
US4759571A1988-07-26
US3664443A1972-05-23
Attorney, Agent or Firm:
ERTL, Nick (8 Pembroke RoadSevenoaks, Kent TN13 1XR, GB)
Download PDF:
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