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)
HARALD SYSE (NO)
Application Number:
PCT/EP2013/050509
Publication Date:
January 16, 2014
Filing Date:
January 11, 2013
Export Citation:
Assignee:
REELWELL AS (NO)
International Classes:
E21B17/18; E21B21/12; F16L9/18; F16L39/00
Domestic Patent References:
WO2003033955A1 | 2003-04-24 |
Foreign References:
US3998479A | 1976-12-21 | |||
US4012061A | 1977-03-15 | |||
US3970335A | 1976-07-20 | |||
US4067596A | 1978-01-10 | |||
US5423575A | 1995-06-13 | |||
US20090189358A1 | 2009-07-30 | |||
US4632406A | 1986-12-30 | |||
US4928999A | 1990-05-29 | |||
US4082323A | 1978-04-04 | |||
US5020611A | 1991-06-04 | |||
US4759571A | 1988-07-26 | |||
US3664443A | 1972-05-23 |
Attorney, Agent or Firm:
ERTL, Nick (8 Pembroke RoadSevenoaks, Kent TN13 1XR, GB)
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