SEALING UNIT OF WELL-IMMERSED DEVICE Russian patent published in 1998 - IPC

FIELD: oil and gas production industry. SUBSTANCE: this relates to subsurface equipment for separate operation of beds, preventing uncontrolled gushing, water-proofing activities, hydraulic fracturing of beds. Improved reliability of sealing units is achieved by regulation of load brought to bear upon them. Device has body which carries washers with inclined end surfaces creating trapezium-like chambers between each other and body. Washers themselves are in the form of disk springs. Installed between washers are sealing rings. Washers are adapted for preventing overloading of sealing rings. Trapezium-like chambers are arranged in body successively. EFFECT: higher efficiency. 5 cl, 10 dwg