Apparatus and method to reduce fluid pressure in a wellbore

Details Apparatus and method to reduce fluid pressure in a wellbore Apparatus and method to reduce fluid pressure in a wellbore

E - Fixed Constructions

21

B

E21B 21/08 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2487100

The present invention generally provides apparatus and methods for reducing the pressure of a circulating fluid in a wellbore. In one aspect of the invention an ECD (equivalent circulation density) reduction tool provides a means for drilling extended reach deep (ERD) wells with heavyweight drilling fluids by minimizing the effect of friction head on bottomhole pressure so that circulating density of the fluid is close to its actual density. With an ECD reduction tool located in the upper section of the well, the friction head is substantially reduced, which substantially reduces chances of fracturing a formation.

La présente invention se rapporte de manière générale à un appareil et à des procédés de réduction de la pression d'un fluide en circulation dans un puits de forage. Dans un mode de réalisation de l'invention, un outil de réduction de la densité de circulation équivalente (ECD) fournit un moyen pour le forage de puits profonds à portée étendue (ERD) avec des fluides de forage lourds en minimisant l'effet de perte de charge sur la pression du fond de trou de sorte que la densité de circulation du fluide est proche de sa densité réelle. Avec un outil de réduction de l'ECD situé dans la section supérieure du puits, la hauteur équivalente de perte de charge est sensiblement réduite, ce qui réduit sensiblement les risques de fracturation d'une formation.

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