INSULATING ANNULAR CUTOFF VALVE UNIT Russian patent published in 2020 - IPC E21B33/43 E21B34/04 

FIELD: technological processes.

SUBSTANCE: group of inventions relates to unit of insulating annular cutoff valve unit of annular space, connected to tubing suspension of underwater well equipment. Block of insulating annular cutoff valve of annular space is part of tubular suspension assembly and comprises passage channel of valve with hole for fluid medium, extension sleeve with axial channel installed in passage channel of valve. Extendable sleeve has radial hole. Hydraulic piston is functionally connected with extending sleeve. Main hydraulic opening chamber and main hydraulic closed chamber. Extendable sleeve comprises axial hole for fluid medium, providing fluid communication with radial hole of sleeve. In order to implement the method of transferring the insulating annular cutoff valve unit of the annular space of the tubular suspension assembly from the closed mode to the open one, the pressure in the main hydraulic closed chamber is released. Pressure of fluid medium is applied in annular channel of underwater Christmas tree for extension of sleeve of unit of isolating annular cutoff valve of annular space and movement downwards from closed position to open position. In order to implement the method of determining the open mode of the insulating annular cutoff valve, the closed hydraulic chamber is ventilated after the sliding cartridge is moved from the closed position to the open position. Hydraulic closed chamber is sealed and pressure is applied at simultaneous monitoring of fluid medium pressure.

EFFECT: technical result is improved reliability of annular cutoff valve and increased efficiency of valve position determination.

9 cl, 12 dwg