Dual concentric pipe joint

Details Dual concentric pipe joint Dual concentric pipe joint

E - Fixed Constructions

21

B

255/24

E21B 17/046 (2006.01) F16L 55/00 (2006.01)

Patent

CA 1106355

ABSTRACT OF THE DISCLOSURE Apparatus is disclosed for drilling a pilot hole and subsequently enlarging the pilot hole in earth formation. A dual concentric pipe string is used for circulating air down- wardly through the outer pipe, a cross-over sub and through a pilot bit and upwardly through the bore hole outside the pipe string to bail cuttings, during drilling of the pilot hole. The air pressure expands the cutters of an expansible bit while a limited portion of the air supplied cools the cutters. The dual concentric pipe is made up by joints having pin and box structures which provide inner and outer flow passages and shoulders which abut between the outer members and which are resiliently sealed between the inner members.

341675

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