CUTOFF VALVE Russian patent published in 2018 - IPC F16K31/68 F16K31/12 E21B34/08 

FIELD: measuring equipment; mining.

SUBSTANCE: invention relates to the formation fluid flow rate control devices in horizontal wells with steam-thermal action onto the formation. Device consists of detachable housing, in the axial channel of which a fixed seat is installed, in which a nut with ribs is arranged. Above the seat bushing with bottom in the middle part is installed. Under the bottom spring-loaded hollow plunger with pressed to the bottom poppet valve is installed. Inside the bushing installed are container with thermal expanding substance and pusher with an annular projection, passed through the central opening with mating boring, inside the hollow plunger cavity. Container is fastened inside the bushing with a nut and forms the annular gap with it, by the bypass holes hydraulically connected to the detachable housing axial channel. Bushing is provided with ribs, which enter into the detachable housing parts connection point. Through the adapter device is connected to the horizontal well pipe outlet end. With the heated to temperature of +60÷70 °C formation fluid supply though the device, the structural parts warming up takes place with the opened valve. With the gas-vapor mixture with a higher temperature breakthrough, the device further heating takes place, with increase in the thermal expanding substance volume, which leads to the pusher with hollow plunger displacement towards the seat, with the poppet valve seating onto it and termination of the gas-vapor mixture supply. Formation fluid accumulation takes place in the wellbore, with the structural parts cooling with decrease in the thermal expanding substance volume. Poppet valve moves away from the seat, followed by the formation fluid supply from the well. Mechanical impurities are removed from the valve cavity by the gas stream through the nipple.

EFFECT: proposed is the formation fluid flow rate control device in horizontal wells with steam-thermal action on the formation.

1 cl, 3 dwg