COLUMN HEAD Russian patent published in 2000 - IPC

FIELD: mining industry. SUBSTANCE: invention can be used to seal well head. Column head includes body and cover with branch pipes. Sealing collar with movable bushing is put on outer cylindrical surface of coupling inside body. Lower sealing collar is placed in space between coupling and body. Outer ring boss of cover is put on it. Upper sealing collar is located in space between coupling and inner conical surface of cover. Outer ring boss of grand box is placed on it. Grand box is fastened by bolts to face of cover. Ring metal sealing is laid between faces of body and cover. Pins with nuts are inserted into holes of flanges in body and cover uniformly arranged over circumference. Wedge suspension with axial duct and holes is located inside coupling. Conical surface of wedge suspension is conjugate to inner surface of coupling. Teeth situated in axial duct of wedge suspension hold production string by its coupling. Antiejection ring is set above wedge suspension in upper part of coupling and column flange is screwed into this coupling. Leakproofness of head is raised by use of combined seal in connection of body to coupling. Location of grand box on face of cover provides for replacement of cover without disassembly of spout valves and improves its maintainability. Tension of production string can be adjusted by movement of wedge suspension over coupling. Antiejection ring and connection of body and cover with the use of pins and nuts ensures safety of usage of head under various pressure. EFFECT: enhanced operational safety of connection of production string. 1 dwg