FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry and is intended for tight closure of flow section of production string in case of emergencies or performing process operations requiring stripping the formation from wellhead during construction, operation and repair of wells. Controlled cutoff valve for gas wells includes housing, plate, bushing, hydraulic input for supply of control fluid. Hydraulic input is made in the form of independent control tubes connected to a paired drive and a pusher with a spring. Pusher is connected to the lever mechanism by means of pressure transfer in one of the control tubes. Pressure relief valve is installed in the plate for pressure stabilization at opening of cutoff valve.
EFFECT: improving reliability of cutoff valve and its control.
4 cl, 5 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| HYDRAULICALLY-OPERATED SHUTOFF VALVE OF CARTRIDGE TYPE | 2014 |
|
RU2566353C1 |
| CUT-OFF VALVE | 2013 |
|
RU2533394C1 |
| PUMPING PACKER AND CUTOFF SYSTEM FOR SIMULTANEOUS AND SEPARATE OPERATION OF WELL FORMATIONS (VERSIONS) | 2013 |
|
RU2519281C1 |
| CUTOFF VALVE | 2018 |
|
RU2679153C1 |
| WELL FLOW BREAKER | 1995 |
|
RU2091284C1 |
| SUB-SURFACE SAFETY VALVE | 2016 |
|
RU2620697C1 |
| CONTROLLED SHUTOFF VALVE | 2016 |
|
RU2636187C1 |
| SUBSURFACE SAFETY VALVE | 2017 |
|
RU2651860C1 |
| SELF-CONTAINED SHUTOFF DEVICE | 2010 |
|
RU2445445C1 |
| DEEP-WELLCLOSURE VALVE | 0 |
|
SU874993A1 |
