|Çelik, Paslanmaz Çelik, Monel, Hastelloy, Duplex, Super Duplex|
Tahrik Ünitesi :
|Manuel, Elektrikli, Pnömatik, Hidrolik|
|max. (+500 °C)|
Anma Çapı :
|2″ – 10″ / max 7 1/16″|
|max. Class 2500 – API 15.000 psi|
Used mostly in Oil & Gas production wells to control flow, choke valves remove pressure from the reservoir to regulate downstream pressure in the flowlines. Generally, in well applications there are two choke valves used in series, one being regulating and the other non-regulating. The regulating choke valve is generally seen downstream of the non-regulating valve.
Non-regulating choke valves are primarily used as on-off valves and are used to lower the reservoir pressure to a desired operating value. This valve type is not utilised for flow regulation purposes. Regulating flow valves are a flow control valve which is generally controlled via an electrical, pneumatic or hydraulic signal from a control panel. These valves are used to maintain steady production levels in the appropriate pipelines.
Choke valves are generally of a heavy duty design to withstand the rigours seen during wellhead operations. The design focuses on providing ease of maintenance and reliability. Commonly they are designed to API6A and utilise a wear resistant trim to ensure the longest service life possible.
Choke valves represent critical components in both the surface and subsurface wellhead assemblies. Wellheads require the reduction of pressure within the pipeline to ensure that pipeline pressure is not exceeded and that the pipeline and its components integrity remains in-tact. Along with ensuring that the pressure drop is appropriate the flow of the raw medium also needs to be controlled to ensure that production levels are met and maintained.
Because of the nature of this application the valve internals can be exposed to very harsh conditions, from being attached chemically to experiencing erosion or cavitation. As such it is vital that the correct plug and or cage is selected for the appropriate application to ensure the valve is serviceable for its full life-time.
PACs experience within the Oil & Gas industry allows us to excel in the supply of valving for extremely harsh conditions where complex combinations of materials or designs are required.
Non-regulating choke valves
Function of the non-regulating choke valve is to act as an on-off valve and kill the reservoir pressure to a desired operating value in the flowline. The opening in the choke valve is sized to kill the pressure when valve is fully open. The non-regulating choke valve is not used for flow regulation and hence is not sized for controlling the flow.
Over the life of an oil production well, the reservoir pressure drop as fluids are depleted from the reservoirs. Hence with dropping reservoir pressure, the non-regulating valves may have to be changed to maintain the same well production levels. Hence over the life of an oil production well, the non-regulating choke valves can be replaced with valves having increasingly larger openings for flow.
Coke Valves designed to API 6A
Regulating choke valves
The regulating choker valve is a flow control valve which is designed to maintain a steady production level in the flowlines and production header. Regulating choke valve is an automatic valve and valve opening can be controlled via electric or pneumatic signal from the control panel to regulate the flow in downstream flowlines.
Among other applications, choker valve can be used in liquid lines operating at very high pressures.
- Wellhead control valve/choke
• Wellhead choke to help reduce hydrates
• Pump bypass control
• Remote control (actuated) of wellhead flow lines • Water and CO2 injection wellhead control valve • Gas storage wellhead
• Gas lift injection control valve
• Gas plant flow control valve
• Back pressure valve on bottom hole pump
• Remote control valve on directional drilling
• Pump start-up
• Sales gas line
• Gas blowdown line
• Automated line heater choke
- Fixed choke
- Positive choke
- Adjustable choke
- Needle and seat type
- Multiple orifice valve
- Cage valve