E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/40 (2006.01) E21B 4/14 (2006.01) E21B 10/32 (2006.01) E21B 21/16 (2006.01)
Patent
CA 2279224
A reverse circulation, pneumatic drilling assembly (10) wherein the bit assembly (11) is operatively connected to a dual wall pipe assembly (12). A supply of compressed air is conducted through the annulus of the dual wall pipe assembly (12) to a downhole pneumatic hammer (17). Exhaust air from the downhole pneumatic hammer is directed to the bit assembly (11) for continuous removal of drilling debris through a central evacuation tube of the dual wall pipe assembly (12).
L'invention concerne un ensemble forage pneumatique à injection inverse (10), dans lequel l'ensemble trépan (11) est connecté de façon fonctionnelle à un ensemble tuyau à deux parois (12). Un apport d'air comprimé est dirigé à travers l'espace annulaire de l'ensemble tuyau à deux parois (12) vers un marteau pneumatique fond de trou (17). L'air rejeté provenant du marteau pneumatique fond de trou est dirigé vers l'ensemble trépan (11) afin de permettre l'évacuation en continu de débris de forage par un tuyau central d'évacuation de l'ensemble tuyau à deux parois (12).
Holte Ardis L.
Oyen Wiggs Green & Mutala Llp
LandOfFree
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