Metal-to-metal sealing is superior to rubber material sealing. It has stronger capability in resisting ageing, high temperature and well fluid corrosion.
Thanks to the streamline seat, the fluid impact towards this product is reduced and thus the product life is extended.
Lubrication or routine maintenance is not required.
It supports the partial or entire weights of all casing pipes except for the conduit via the hanger.
It connects the blowout preventer and other wellhead devices.
Pressure sealing is formed between the internal and external casing strings.
It provides exit for the pressure accumulated between the two layers casing pipes.
When the blowout preventer is shut down, the choke valve is utilized for controlling the casing pressure to maintain that the pressure of well bottom is always higher than that of the ground, and thereby to prevent the formation fluid from flowing into the well.
During the well is shut in, the choke manifold decompression can be adopted for soft shut in well. When the pressure inside the well reaches certain limit, the wellhead can be protected through the blowout via it.
It connects all layers of subsurface casing pipes, seals the annular spaces between casing pipes and supports the partial weights of casing pipes.
It is used for oil tube and tool hanging, tubing string supporting and annular space sealing between oil tubes and casing pipes.
It controls and regulates the production of well.