Drill pipes and casings utilizing multi-conduit tabulars

Details Drill pipes and casings utilizing multi-conduit tabulars Drill pipes and casings utilizing multi-conduit tabulars

E - Fixed Constructions

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B

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E21B 17/02 (2006.01) E21B 17/00 (2006.01) E21B 17/18 (2006.01) E21B 21/02 (2006.01) E21B 21/08 (2006.01) E21B 21/12 (2006.01) F16L 39/04 (2006.01) F16L 39/06 (2006.01)

Patent

CA 1328254

Abstract of the Disclosure An improved drill pipe utilizing multi-conduit tubulars is provided. A seal subassembly is constructed and arranged so as to receive a plurality of similar tubular conduits. The similar tubular conduits are inserted into both ends of the seal subassembly. At one end, the tubular conduits are threadably attached to the seal subassembly, while at the opposite end, the tubular conduits are slidably attached to the seal subassembly. T-rings seals are provided to insure sealing engagement of the tubular conduits to the seal subassembly. A collar is provided to join a drill pipe to one end of the seal subassembly. A lift subassembly is provided to attach the other end of the seal subassembly to another drill pipe. The seal subassembly is constructed so as to allow the tubular conduits to be of strength sufficient to withstand pressure and compression forces only. Tension and torsional forces are handled entirely by the drill pipe outer casings, the collar, the seal subassembly, and the lift subassembly.

573104

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