... rising, in order to ensure the safety of blowout preventer, mud in high proportion will be injected by ... the well to control well pressurewhen full-sealing ram seals the wellhead in full, strong clean water ... into the wellhead to prevent fire burningwhen the blowout has occoured, strong clean water will be ... into the wellhead to prevent fire burningwhen the blowout is on fire, extingishing agent will be ...