DRILLING RIG AND METHOD FOR INTRODUCING ONE OR MORE DRILLING PIPES INTO AN UNDERBALANCED WELL USING SAME

摘要

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.