E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 3/02 (2006.01) E21B 7/00 (2006.01) E21B 7/02 (2006.01)
Patent
CA 2708520
A method for drilling an auxiliary hole, such as a conductor hole, a mousehole or a rathole, useful in wellbore drilling operations, the method comprising the steps of installing an auger drive unit (10) on a drill floor (8) of a drilling rig (R), the auger drive unit (10) comprising a drive (50) having a rotor (51), and a structure (20) for supporting the drive (50), the drive (50) movable in a substantially vertical plane in relation to said structure (20), the method further comprising the steps of connecting an auger (16) to said rotor (51) and rotating said auger (16) to drill said auxiliary hole.
L'invention porte sur un procédé pour forer un trou auxiliaire, tel qu'un trou de conducteur, un trou de souris ou trou de rat, utile dans des opérations de forage de puits de forage, le procédé comprenant l'installation d'une unité d'entraînement de tarière (10) sur un plancher de forage (8) d'un appareil de forage (R), l'unité d'entraînement de tarière (10) comprenant un entraînement (50) ayant un rotor (51), et une structure (20) pour supporter l'entraînement (50), l'entraînement (50) étant mobile dans un plan sensiblement vertical par rapport à ladite structure (20), le procédé comprenant en outre la liaison d'une tarière (16) audit rotor (51) et l'entraînement en rotation de ladite tarière (16) pour forer ledit trou auxiliaire.
Mcfadden Fincham
National Oilwell Varco L.p.
LandOfFree
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