Method for formation pressure control while drilling

E - Fixed Constructions – 21 – B

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E21B 49/00 (2006.01) E21B 21/08 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2468732

A method for addressing the problem known as formation breathing occurring during the drilling of a subsea well in an earth formation in performing a series of leak off tests to determine the earth formation fracture propagation pressure and the earth formation fracture reopen pressure and maintaining the hydrostatic pressure on the earth formation in a range between the fracture reopen pressure and the fracture propagation pressure.

Procédé concernant la respiration d'une formation pendant le forage d'un puits sous-marin dans une formation terrestre, ce qui consiste à effectuer une série d'essais de fuite afin de déterminer la pression de propagation d'une fracture de la formation terrestre et la pression de réouverture de cette fracture et à maintenir la pression hydrostatique sur ladite formation terrestre dans une plage située entre la pression de réouverture et la pression de propagation de la fracture.

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