Patent ID: 6125928
Filing Date: 2000-10-03
Classification: E21B,Y10T

Abstract:
Valve equipment for blocking oil or gas drilling pipes, comprising:drilling and blocking mechanism having a frame mounted on support of a pipe to be blocked, the frame comprising a first frame part transversal to a direction of the pipe and disposed at a first side of the pipe, and a second frame part disposed at a second side of pipe opposite to the first side;a hydraulically rotatable drill for boring through the pipe, the drill being arranged inside the first frame part to move transversally in relation to the direction of the pipe;a plugging cylinder for plugging the hole bored through the pipe, the plugging cylinder being arranged inside one of the first and second frame parts to move transversally in relation to the direction of the pipe; andmeans for moving the plugging cylinder into a plugging position at the hole bored through the pipe;wherein the drilling and blocking mechanism comprises stuffing boxes made of hard material and are disposed inside the first frame part and the second frame part between said frame part and the drill and the plugging cylinder for directing movement of the drill and the plugging cylinder, the stuffing boxes having sharp front ends facing the pipe, the front ends being shaped to the form of the outer wall of the pipe, and the stuffing boxes being movable and guided by said frame part transversally towards the pipe from opposite sides of the pipe for sealing the pipe tighteners being provided for pushing the stuffing boxes against the pipe and locking means being provided for locking the tighteners into a fixed position in relation to the frame parts.