E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/26 (2006.01) E21B 10/32 (2006.01)
Patent
CA 2747096
An apparatus for drilling a wellbore (10) is disclosed, the apparatus comprising a lowermost pilot drill bit (16) having a diameter less than that of the diameter of wellbore (12) drilled by the apparatus, above which is a reamer, having an adjustable drill diameter from a first diameter less than that of the pilot drill to a second diameter greater than that of the pilot drill, above which is a body portion (24) having a lower diameter less than that of the pilot drill and an upper diameter greater than that of the pilot' drill but less than the second diameter of the reamer.
L'invention porte sur un appareil pour forer un puits de forage (10), l'appareil comprenant un trépan pilote le plus bas (16) ayant un diamètre inférieur à celui du diamètre de puits de forage (12) foré par l'appareil, au-dessus duquel se trouve un aléseur, ayant un diamètre de forage réglable d'un premier diamètre inférieur plus petit que celui du trépan pilote à un second diamètre supérieur plus grand que celui du trépan pilote, au-dessus duquel se trouve une partie de corps (24) ayant un diamètre inférieur plus petit que celui du trépan pilote et un diamètre supérieur plus grand que celui du trépan pilote mais plus petit que le second diamètre de l'aléseur.
Jeffryes Benjamin Peter
Johnson Ashley Bernard
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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