Fault check and maintenance of special tubing head spool and casing head joint
Casing hanger also has a main seal and seal design, the main casing hangers types are rubber seal and seal USES is square type "O" ring seal in the form of combination of vice seal is to use "BT" sealing ring and sealing grease (PTFE) was injected through the seal. 1. Seal ring leakage of two flange joints. If leakage occurs in the sealing gasket ring of the two flange joints, the main seal or secondary seal of the casing hanger has been leaked, and it may be that both the main seal and the secondary seal are leaking. The cause of the main seal leakage is square seal is damaged or heat expansion will casing pipe hanger upward lift, causing party type sealing ring seal effect, so should pay special attention to when the casing hanger, square seal damage can not be cut. The reason for the secondary seal leakage is that the "BT" sealing ring cannot be sealed. (PTFE should be injected into the "BT" sealing ring after the tubing head is connecte...