Design, manufacture and test standard
API Spec 16A (3th) (16A-0100): specification for drill-through equipment
API spec 6A (20th) (6A-0474): Specification for wellhead & X-tree Equipment
NACE MR0175-2003/ISO 15156: Petroleum and natural gas materials in H2S environments
The grease injection seal head?by injecting high-pressure high-viscosity sealing grease?to accomplish the static and dynamic seal the cable wellhead.
A grease injection hole and a grease return hole, and there are?several choke tubes are mounted in the main body of the grease injection seal head. The quantity of choke tubes can be increased or decreased according to the pressure in well, more choke tubes will be used if the pressure in a well is high, and the quantity of choke tubes can be properly reduced if the pressure in a well is low.
The grease injection seal head contains stuffing box and linewiper. And the safety choke flow ball valve is designed on it, once the cable falling off or broken from the cable head accidentally, the safety choke flow ball valve can plug the cable hole to choked flow and seal wellhead automatically.