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HI
THE BOP IS FOR CONTROL ANY BLOW OUT OR KICK IN WELL AND THE X-MASS TREE IS FOR COMPLETION THE WELL, WE USED BOP WHILE DRILLING & USE X-MAS TREE WELL RIG IS COMPLETED
Blow out preventer refers to the whole assembly including blind, annular, shear rams which are utilized in case of high pressure kick. Christmas tree is series of valves at surface controlling the pressure
