High pressure sleeve for dual bore HP riser
A high pressure sleeve for a dual bore high pressure riser is provided. The high pressure sleeve is arranged for forming a connection between either the annulus bore and the high pressure sleeve, or for forming a connection between the high pressure sleeve and the production bore. The choice of connection is made by rotation of the sleeve.
1. 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 ).
2. A method for using 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, with 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 ), the method comprising the steps of:
connecting said high pressure mono bore sleeve ( 11 ) with said connector pin end ( 34 ) to one of said annulus or production bores ( 16 , 22 ) in said sleeve latch ( 18 ),
lifting said high pressure mono bore sleeve ( 11 ) with said connector pin end ( 34 ), by using a top drill, from said one of said annulus or production bores ( 16 , 22 ),
rotating said high pressure mono bore sleeve ( 11 ) with said connector pin end ( 34 ) 180 degrees to an opposite of said production or annulus bores ( 22 , 16 ), and
lowering said high pressure mono bore sleeve ( 11 ) with said connector pin end ( 34 ) into said opposite of said production or annulus bores ( 22 , 16 ).
3. The method of claim 2 , further comprising:
changing between first operations including sub-sea drilling, and second operations including at least one of well intervention, well completion, and workover.