Structure of casing head

The wellhead casing is composed of four-way, casing hanger, jacking assembly, flange type parallel gate valve, connector, pressure display mechanism, etc;

Metal and rubber seal of wellhead casing

The metal and rubber seals of the casing head are composed of the wellhead casing body, BT rubber seal, upper metal seal component, lower metal seal component, casing hanger, dovetail rubber seal ring, Lockdown screw seal, and sealing gasket ring. The casing hanger is mounted on the casing head body step. Because of the hanging weight of the casing, the contact between metal and metal will produce a rigid passive seal. The casing hanger and casing are sealed by thread; Before installing the upper flange, measure the position and size of the upper metal sealing ring in the upper flange hole, and then determine the thickness of the adjusting ring, so that a certain amount of interference will emerge from the adjusting ring in the upper flange hole. When the upper flange is connected with the casing head cross, the adjusting ring is compressed through the casing head cross to deform the upper metal sealing ring, thus achieving the function of sealing casing hanger.

The sealing principle of the lower metal sealing component of the casing hanger is to ensure the geometric dimensions of each part through the design of the metal sealing ring, the casing head cross and the casing hanger. The 45 ° cone on the jackscrew rotates to make the lower metal sealing component press ring down, so that the U-shaped ring of the metal sealing ring component is deformed, thus achieving the role of the casing hanger.