ARRANGEMENT OF WELL-HEAD EQUIPMENT Russian patent published in 2001 - IPC

FIELD: mining industry, oil and gas production. SUBSTANCE: arrangement includes column head, column cross and pipe head. Axis of central conduit of pipe head is displaced relative to central axis of column cross away from high-pressure cable lead-in by calculated value. Controllable non-return valve of hydraulic communication of hole clearance to conduit of working string is made in wall of column cross. Body of non-return valve is pressed into seat. Seat is made in wall of column cross. High-pressure cable lead-in is manufactured in the form of bushing with collar inside in one end and internal thread at the other end to accommodate pressure nut with tail that seals separate conductors of electric cable by split collars. Outer surface of bushing has annular grooves in which springy sealing rings are located. Pipe head has seat for installation and fixation of packing bushing by split spring bearing ring. EFFECT: simplified design of arrangement, reduced number of components, improved operational characteristics, simplified mounting and dismantling, prevention of valve freezing, reduced usage of metal for banding. 1 dwg