APPARATUS FOR ESTABLISHING PEBBLY WELLS OF LARGE-DIAMETER AND LARGE-DEPTH

摘要

Equipment comprises shaft, weight, drilling pipe coupling, drilling stem, drilling plate, drilling base and centralising rollers. Typically, three drilling plates (5) are used, each connected to an opening wing by means of connecting elements (6). An 'opening spring' (9) is mounted on each connecting element (6), which are also connected to safety elements (8). Several centralising rollers (16) are mounted on the shaft using bearings (15). - Auxiliary equipment includes strainer pipe, fixing ring, spring basket and sliding ring. Typically, in the auxiliary equipment, the fixing ring (20) is attached to the strainer pipe (19) so that it cannot move. One side of the spring basket (21) is connected to the fixing ring (20) while its opposite side is connected to the sliding ring (2222