"SIBIR" WELLHEAD UNIVERSAL EQUIPMENT Russian patent published in 2002 - IPC

FIELD: mechanical engineering, particularly, oil and gas producing industry; applicable in connection of flow strings, tubings and pipes of headers at oil and gas producing wells. SUBSTANCE: SIBIR wellhead universal equipment has two-ended packer with central ring installed between casing head and sub. Connections of casing head with sub, shut-off devices, connection pipes and with tubing string are made in the form of quick-break insertion joints fixed by sleeve. Packing rings in end face grooves of joints are located with external split ring engageable with quick-break lock. Hydraulic communication with intertube space between tubing and casing is presented in the form of radial holes and external circular channel made in central ring of two-ended packer and in sub, radial hole in casing head and discharge branch pipe installed in said casing head. EFFECT: new multipurpose equipment, reliable in operation. 2 cl, 2 dwg