A flow base system for subsea wells

Abstract

A flow base system (1) for subsea wells is disclosed, the flow base system comprising a header pipe (2) for production fluid extended through the flow base system, wherein from opposite sides of the header pipe (3) a set of flow base modules (2), respectively, is connected for supply of production fluid to the header pipe (3) via individual branch pipes (10) connecting the header pipe (3) with a Christmas tree (XT) interface (11) arranged for vertical connection to an XT respectively. The flow base system (1) is installed in a well template structure (18), wherein a flow base module (2) respectively is inserted into each well slot (S1-S4) formed in the well template structure (18).

1 . A flow base system ( 1 ) for subsea wells comprising a template structure ( 18 ) with a header pipe ( 3 ) and a number of flow base structures ( 2 ),
 each flow base structure comprising a XT interface ( 11 ) connectable to a XT and wellhead,   a set of flow base structures ( 2 ) being arranged on each side of the header pipe,   each flow base structure being connected to the header pipe ( 3 ) via individual branch pipes,   the flow base structures ( 2 ) being fixed to the well template structure ( 18 ).   
     
     
         2 . The flow base system of  claim 1 , wherein the piping of the flow base system ( 1 ) is fixed to the template structure ( 18 ). 
     
     
         3 . The flow base system of  claim 1 , wherein the piping of the flow base system is partly fixed to the flow base structures ( 2 ). 
     
     
         4 . The flow base system of  claim 1 , wherein the valves of the system are removable. 
     
     
         5 . The flow base system of  claim 1 , comprising two or more header pipes. 
     
     
         6 . The flow base system of  claim 1 , wherein the flow base modules ( 2 ) are essentially identical and the flow base modules on one side of the at least one header pipe ( 3 ) are turned 180° in relation to the orientation of the flow base modules on the other side of the at least one header pipe. 
     
     
         7 . The flow base system of  claim 1 , wherein each flow base module ( 2 ) comprises a well insert ( 14 ) in fixed relation to guiding means ( 15 ) arranged for guidance of an XT during landing and installation. 
     
     
         8 . The flow base system of  claim 4 , wherein the guiding means ( 15 ) is realized as guide posts/pillars or as funnel-equipped tubes rising from a flow base support ( 13 ), in which the branch pipes ( 10 ) and valves as well as XT interfaces ( 11 ,  38 ) are supported. 
     
     
         9 . The flow base system of  claim 1 , wherein a singular isolation valve ( 12 ) on each branch pipe ( 10 ) is controllable for opening the branch pipe for flow of production fluid into the one or more header pipes ( 3 ). 
     
     
         10 . The flow base system of  claim 1 , wherein coupling means ( 7 ) is arranged in an end ( 4 ) of one or more header pipes ( 3 ) for connecting to external subsea equipment. 
     
     
         11 . The flow base system of  claim 10 , wherein an isolation valve ( 6 ) in said end ( 4 ) of the one or more header pipes ( 3 ) is controllable for through flow of production fluid from external equipment. 
     
     
         12 . The flow base system of  claim 1 , wherein a valve control interface ( 29 ) is installed for intervention by a remotely operated vehicle (ROV) or diver. 
     
     
         13 . The flow base system of  claim 1 , wherein a well intervention system ( 35 ) is installed essentially in parallel with the production fluid pipework. 
     
     
         14 . The flow base system of  claim 13 , wherein the well intervention system ( 35 ) comprises at least one header pipe ( 36 ) with branch pipes ( 37 ) extended to each flow base module ( 2 ). 
     
     
         15 . The flow base system of  claim 13 , wherein the fluid of the well intervention system is supplied via an umbilical ( 32 ) to an umbilical termination assembly ( 33 ) associated with the flow base system. 
     
     
         16 . The flow base system of  claim 1 , wherein a flow base module ( 2 ) comprises an extension ( 16 ) for connecting to an external supply of production fluid via a jumper pipe.