System for controlling the discharge of drilling fluid

Details System for controlling the discharge of drilling fluid System for controlling the discharge of drilling fluid

E - Fixed Constructions

21

B

E21B 21/08 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2460161

A drilling system is provided for drilling a borehole (3) into an earth formation (5), the drilling system comprising pump means (19, 30) for pumping drilling fluid into the borehole (3) and discharge means (50) for discharging drilling fluid from the borehole (3). The discharge means (50) comprises at least one pressure chamber (60, 61) for temporarily accommodating drilling fluid being discharged from the borehole (3), and control means (69) for controlling the fluid inflow into each pressure chamber (60, 61).

Cette invention concerne un système de forage permettant de forer un trou (3) de forage dans une formation terrestre (85), lequel système de forage comprend un mécanisme de pompage (19, 30) servant à pomper le fluide de forage se trouvant dans le trou (3) de forage ainsi qu'un mécanisme de refoulement (50) servant à évacuer le fluide de forage du trou (3) de forage. Ce mécanisme de refoulement (50) comprend au moins une chambre (60, 61) de refoulement conçue pour recevoir temporairement le fluide de forage évacué du trou (3) de forage et un élément de commande (69) servant à commander l'arrivée de fluide dans chaque chambre (60, 61) de refoulement.

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