Dual concentric pipes

Details Dual concentric pipes Dual concentric pipes

1974-10-24

1976-07-20

Callaghan, Thomas F.

Pipe joints or couplings

For branched path

T-type

285236, F16L 3900, E21B 106

Patent

active

039703355

ABSTRACT:
A dual concentric pipe string for bore hole coring having inner and outer concentric pipe sections, the outer pipe sections being secured together by the usual threaded connection, the inner pipe sections being connected through coupling devices containing elastomeric bodies that make a friction fit with the end portions of adjacent inner pipe sections, the inner pipe sections being frictionally secured to longitudinally spaced elastomeric centralizers having circumferentially spaced longitudinal ribs engaging the inner wall of the outer pipe sections to maintain the inner sections coaxial of the outer sections, with some of the centralizers engaging transverse shoulders in the outer sections to secure the inner sections in the outer sections against substantial longitudinal movement with respect thereto.

REFERENCES:
patent: 2369849 (1945-02-01), Phillips
patent: 3068026 (1962-12-01), McKamey
patent: 3430989 (1969-03-01), Wendt
patent: 3471177 (1969-10-01), Garrett et al.
patent: 3664441 (1972-05-01), Carey

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