E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/00 (2006.01)
Patent
CA 2635097
A method for controlling formation pressure during drilling includes pumping a drilling fluid through a drill string in a borehole, out a drill bit at the end of the drill string into an annular space. The drilling fluid is discharged from the annular space proximate the Earth's surface. At least one of a flow rate of the drilling fluid into the borehole and a fluid flow rate out of the annular space is measured. Pressure of the fluid in the annular space proximate the Earth's surface and pressure of the fluid proximate the bottom of the borehole are measured. Pressure of the fluid proximate the bottom of the borehole is estimated using the measured flow rate, annular space pressure and density of the drilling fluid. A warning signal is generated if difference between the estimated pressure and measured pressure exceeds a selected threshold.
L'invention porte sur un procédé de régulation de la pression pendant un forage consistant à pomper dans le puits un fluide de forage via le train de tiges et le trépan dans un espace annulaire. Le fluide se décharge depuis l'espace annulaire au voisinage de la surface du sol, et on mesure le débit du fluide pompé dans le puits, et le celui sortant de l'espace annulaire, et on estime la pression du fluide en fond de puits à l'aide des débits mesurés, de la pression dans l'espace annulaire et de la densité du fluide. Un signal d'alarme se déclenche si la différence entre la pression estimée et la pression mesurée dépasse un seuil sélectionné.
At Balance Americas Llc
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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