multiple valves fitted on the wellhead of first oil well of gulf, bahrain

1931 bahrain barrel blowout bolt bop box casing casings choke christmas component control drill dukhan energy equipment exploration field first flow fuel gas gasoline gauge gold gulf industry integral jebel joint kingdom latch line liquid machine manometer master oct oil persian pipe pipeline plug point polish pressure preventer production pump regulator rig road seal seals structure stuffing suspension top tree tubing valve valves well wellhead