E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 19/00 (2006.01) E21B 15/00 (2006.01)
Patent
CA 2619932
The invention relates to a drilling rig, comprising a mast to be placed above or close to a well and means connected to the mast for carrying drill pipes to be lowered into the well, which carrying means comprise at least three carriers which are connected at different heights to the mast and displaceable in height direction therealong and which are adapted to exert a pulling force or a pressing force as required on the drill pipes. The upper carrier can have means for rotatingly driving the drill pipes, while the lower carrier, which can be connected releasably to the mast, can have flexible means for connecting thereof to a blowout preventer placed on the well. The invention further relates to a method for introducing one or more drill pipes into an underbalanced well while making use of such a drilling rig, comprising of suspending the drill pipe(s) from the carrying means and urging the pipe(s) downward into the well while exerting a pressing force.
La présente invention concerne une installation de forage comprenant un mât devant être placé au-dessus ou à proximité d~un puits et des moyens reliés au mât destinés à porter des tiges de forage devant être descendues dans le puits, lesdits moyens de support comprenant au moins trois supports reliés à différentes hauteurs au mât, déplaçables en hauteur le long de celui-ci et conçus de manière à exercer la force de traction ou la force de pression nécessaire sur les tiges de forage. Le support supérieur peut comprendre des moyens d~entraînement en rotation des tiges de forage, tandis que le support inférieur, qui peut être relié de manière détachable au mât, peut comprendre des moyens souples destinés à relier celui-ci à un obturateur anti-éruption placé sur le puits. L~invention concerne en outre un procédé d~introduction d~une ou plusieurs tiges de forage dans un puits en sous-pression employant une installation de forage de ce type et consistant à suspendre la ou les tiges de forage aux moyens de support et à descendre la ou les tiges dans le puits sous l~effet d~une force de pression.
Bergman Cornelis
de Wit Lammert
Balance Point Control B.v.
Gowling Lafleur Henderson Llp
LandOfFree
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