device for measuring the position and speed of a drilling tool

摘要

Device making it possible to know, at the time of boring an oil well at sea, the depth of the hole, the position of the tool and its advancing speed; these characteristics are calculated according to the measurements of the paying out of the active end of the cable passing through a block supporting a combination of rods, of the weight at the hook of the combination of rods, of the movement in relation to the structure of the boring tower, of the axis of the upper pulley of the block and of the paying out of the support cables of a tubular part connecting the head of the well to the bottom of the water or craft.