FIELD: oil and gas industry.
SUBSTANCE: hydraulic control system of string for lowering installed in underwater blowout preventer and containing in series with formation of production shaft: upper isolation valve; bypass valve, including a pressure compensation system, a shear branch pipe, an underwater test Christmas tree, including an emergency disconnection mechanism, tool adapter for lowering and lifting of tubing hanger, wherein hydraulic control system of lowering string contains control lines for operation control: an upper isolation valve, a bypass valve, an emergency disconnection mechanism, an underwater test tree.
EFFECT: proposed invention provides increased safety in case of emergency disconnection of equipment in case of emergencies.
8 cl, 6 dwg
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