Patent ID: 8573307

Claim:
A subsurface BOP system comprising: a dual bore sub surface BOP ( 10 ) with a production bore ( 22 ) and an annulus bore ( 16 ) in a bottom of a sleeve latch ( 18 ) at a top of the sub surface BOP ( 10 ), said sub surface BOP ( 10 ) connected to a dual bore riser to a lower BOP at the sea bed, and a high pressure mono bore sleeve ( 11 ) extending from said sub surface BOP ( 10 ) up to a rig floor, said high pressure mono bore sleeve ( 11 ) provided with a connector pin end ( 34 ) at its lower end, said connector pin end ( 34 ) comprising a portion offset the main axis of the high pressure sleeve ( 11 ), said high pressure mono bore sleeve ( 11 ) with said connector pin end ( 34 ) being constructed and arranged to be connected to one of said annulus or production bores ( 16 , 22 ) in said sleeve latch ( 18 ), and further constructed and arranged to be lifted, by using a top drill, from said one of said annulus or production bores ( 16 , 22 ), rotated 180 degrees to an opposite of said production or annulus bores ( 22 , 16 ) and lowered with said connector pin end ( 34 ) into said opposite of said production or annulus bores ( 22 , 16 ).