Drilling system

Details Drilling system Drilling system

E - Fixed Constructions

21

B

E21B 21/08 (2006.01) E21B 19/16 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2373515

A drilling system for drilling a borehole into an earth formation is provided. The drilling system comprises a drill string (1) extending into the borehole whereby an annular space (38) is formed between the drill string and the borehole wall, the annular space containing a body of fluid (40), the drill string including a longitudinal fluid passage having an outlet opening at the lower end part of the drill string, pumping means (19, 30) for selectively pumping drilling fluid via said passage and outlet opening into the body of fluid, and a fluid discharge conduit (48) for discharging fluid from the body of fluid; wherein the drilling system further comprises pressure control means (50, 52, 60, 62) for controlling the fluid pressure in the body of fluid when the pumping means (19, 30) is inoperative to pump drilling fluid into the body of fluid.

L'invention concerne un système de forage pour le percement d'un forage dans le sol, comprenant un train de forage qui s'étend dans le trou de forage. Un espace annulaire est constitué entre le train de forage et la paroi du trou de forage, cet espace contenant un corps de liquide. Le train de forage comporte un passage de liquide longitudinal doté d'une sortie à l'extrémité inférieure du train de forage, un mécanisme de pompage sélectif du liquide de forage via le passage et la sortie considérés dans le corps de liquide, et un conduit d'évacuation de liquide depuis le corps de liquide. En outre, le système de forage comprend une unité de contrôle de la pression du corps de liquide, opérationnelle lorsque le mécanisme de pompage n'est pas en fonction pour le pompage du liquide de pompage dans le corps de liquide.

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