TUBULAR DRILL FOR MOUNTING SEPARATING BRIDGES IN THE WELL Russian patent published in 2004 - IPC

FIELD: oil and gas extracting industry. SUBSTANCE: device has body, elastic sealing ring, conical pusher, shear pin and moveable fixing elements with wedge pusher. Tubular drill additionally has a stop with spring centering means. Stop with sealing ring and moveable fixing elements with wedge pusher is mounted on the body with capability of axial movement. Wedge pusher has guides for moveable fixing elements with wedge pusher, said elements being equipped with limiter. Stop has inner ring-shaped slit. Stop is engaged with auto-disengaging device in upper position relative to the body with technological apertures. Conical pusher interacts with the body by means of shear pin. Auto-disengaging device comprises fixing members in technological apertures of the body and a riser with variable cross-section along outer surface. Raiser interacts with fixing members by means of outer surface. Said members interact with inner ring-shaped slit of the stop. Raiser is fixed relative to the body by a locking member. Additional locking device is also mounted on the body for interacting with the stop for extracting tubular drill from the well after it passes operation course. EFFECT: facilitated manufacture and reliable cement separated bridge placement for isolating productive layers and shaft portions from each other. 1 dwg