Drilling with casing

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/08 (2006.01)

Patent

CA 2604002

A borehole may be drilled utilizing the bottom hole assembly! 0, 50 with a downhole motor 14, 110, which may offset at a selected bend angle. A bend for directional drilling may be provided by a PDM1 or by a RSD. A gauge section 36 secured to the pilot bit 18 has a uniform diameter bearing surface along an axial length of at least 60% of the pilot bit diameter. The bit or reamer 16 has a bit face defining the cutting diameter of the drilled hole. The axial spacing between the bend and the bit face is controlled to less than fifteen times the bit diameter. The downhole motor, pilot bit and bit may be retrieved from the well while leaving the casing string in the well.

Selon l'invention, un trou de forage peut être foré à l'aide d'un ensemble fond du puits 0, 50 équipé d'un moteur de fond 14, 110, qui peut se décaler à un angle de courbure choisi. Un moteur volumétrique ou un dispositif orientable rotatif peut former une courbe destinée à un forage directionnel. Une section manomètre 36 fixée à la couronne pilote 18 comporte une surface portante de diamètre uniforme le long d'une longueur axiale d'au moins 60 % du diamètre de la couronne pilote. Le trépan ou l'aléseur 16 comprend une surface du trépan définissant le diamètre de coupe du trou foré. L'espacement axial entre la courbe et la surface du trépan est ajusté à moins de quinze fois le diamètre du trépan. Le moteur volumétrique, la couronne pilote et le trépan peuvent être retirés du puits tout en laissant la colonne de tubage dans le puits.

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