Method and apparatus for controlling bottom hole pressure in...

E - Fixed Constructions – 21 – B

Patent

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E21B 21/08 (2006.01) E21B 47/06 (2006.01)

Patent

CA 2667199

A method for maintaining pressure in a wellbore during drilling operations is disclosed. The method includes lhe steps of providing fluid from a reservoir through a drill string, circulating the fluid from the drill string to an ann.upsilon.lus between the drill string and the wellbore, isolating pressure in the annulus, measuring pressure in the annulus, calculating a set point backpressure, applying back pressure to the annulus based on thc set point back pressure, diverting fluid from the annulus to a controllable choke, eontrollably bleeding off pressurized fluid from the annulus, separating solids from the fluid, and directing the fluid back to the reservoir. An apparatus for maintaining pressure in a wellbore during drilling operations that includes an adjustable choke for eontrollably bleeding off pressurized fluid from the wellbore annulus. a backpressure pump for applying a calculated set point backpressure, and a processor for controlling the adjustable choke and backpressure pump is also disclosed.

L'invention concerne un procédé pour maintenir une pression dans un puits de forage pendant des opérations de forage. Le procédé comprend les étapes consistant à fournir du liquide à partir d'un réservoir à travers un train de tiges, de faire circuler le liquide à partir du train de tiges vers un espace annulaire situé entre le train de tiges et le puits de forage, isoler la pression dans l'espace annulaire, mesurer la pression dans l'espace annulaire, calculer une contre-pression de point de consigne, appliquer une contre-pression à l'espace annulaire sur la base de la contre-pression de point de consigne, dévier le liquide de l'espace annulaire vers une duse contrôlable, purger de manière contrôlée le liquide sous pression à partir d'espace annulaire, séparer de la matière solide à partir du liquide et rediriger le liquide vers le réservoir. L'invention concerne un appareil pour maintenir une pression dans un puits de forage pendant des opérations de forage, qui comprend une duse ajustable pour purger de manière contrôlée un liquide mis sous pression à partir de l'espace annulaire du puits de forage. L'invention concerne également une pompe de contre-pression pour appliquer une contre-pression de point de consigne calculée, et un processeur pour contrôler la duse ajustable et la pompe de contre-pression.

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