Subsea foundation

Abstract

A subsea foundation system and a method of connecting a lower pipe portion to a subsea foundation are provided. The method includes: providing the subsea foundation, an upper pipe portion being connected to the subsea foundation, deploying the subsea foundation subsea; and connecting the lower pipe portion to the upper pipe portion. The subsea foundation system includes: the subsea foundation; the upper pipe portion connected to the subsea foundation, and the lower pipe portion. The lower pipe portion can be connected to the upper pipe portion subsea. The lower pipe portion may be connected to the subsea foundation 10 in a stowed position before deployment subsea. The lower pipe portion may be connected to a pull-in arrangement before deployment subsea.

1 . A method of connecting a lower pipe portion to a subsea foundation, the method comprising:
 providing a subsea foundation and an upper pipe portion connected to the subsea foundation,   connecting the lower pipe portion to a pull-in arrangement;   deploying the subsea foundation subsea with the lower pipe portion connected to the pull-in arrangement; and   connecting the lower pipe portion to the upper pipe portion subsea using the pull-in arrangement.   
     
     
         2 . The method according to  claim 1 , wherein the upper pipe portion does not protrude beyond the bottom of the subsea foundation and wherein, when the lower pipe portion is connected to the upper pipe portion, at least part of the lower pipe portion protrudes beyond the bottom of the subsea foundation. 
     
     
         3 . The method according to  claim 1 , wherein the method comprises:
 connecting the lower pipe portion to the subsea foundation in a stowed position;   deploying the subsea foundation subsea with the lower pipe portion in the stowed position; and   releasing the lower pipe portion from the stowed position subsea.   
     
     
         4 . The method according to  claim 1 , wherein the pull-in arrangement comprises two pull-in lines that are connected at one end to the subsea foundation and at the other end to the lower pipe portion. 
     
     
         5 . The method according to  claim 1 , wherein the method comprises providing a pipe overlap section, wherein connecting the lower pipe portion to the upper pipe portion comprises overlapping the pipe overlap section on a portion of the upper pipe portion and/or the lower pipe portion. 
     
     
         6 . The method according to  claim 1 , wherein the subsea foundation comprises a suction anchor. 
     
     
         7 . The method according to  claim 1 , wherein the pull-in arrangement comprises one or more pull-in lines that extend through one or more or respective pull-in line conduits, wherein each pull-in line conduit extends through the subsea foundation. 
     
     
         8 . The method according to  claim 1 , wherein the pull-in arrangement comprises one or more pull-in lines, and a pull-in line grip for each pull-in line, wherein each pull-in line grip is located on top of the subsea foundation. 
     
     
         9 . A subsea foundation system for deployment subsea, wherein the subsea foundation comprises:
 a subsea foundation;   an upper pipe portion connected to the subsea foundation; and   a lower pipe portion connected to a pull-in arrangement, wherein the subsea foundation system is arranged such that subsea the lower pipe portion can be connected to the upper pipe portion using the pull-in arrangement.   
     
     
         10 . The subsea foundation system according to  claim 9 , wherein the upper pipe portion does not protrude beyond the bottom of the subsea foundation and wherein, when the lower pipe portion is connected to the upper pipe portion, at least part of the lower pipe portion protrudes beyond the bottom of the subsea foundation. 
     
     
         11 . The subsea foundation system according to  claim 9 , wherein the pull-in arrangement comprises two pull-in lines that are connected at one end to the subsea foundation and at the other end to the lower pipe portion. 
     
     
         12 . The subsea foundation system according to  claim 9 , wherein the lower pipe portion is connected to the subsea foundation in a stowed position, and wherein the subsea foundation system is arranged such that subsea the lower pipe portion can be released from the stowed position. 
     
     
         13 . The subsea foundation system according to  claim 9 , comprising a pipe overlap section, wherein the pipe overlap section is arranged to overlap a portion of the upper pipe section and/or the lower pipe section when the lower pipe portion is connected to the upper pipe section. 
     
     
         14 . The subsea foundation system according to  claim 9 , comprising a pipe connection guide for guiding the connection between the upper pipe portion and lower pipe portion. 
     
     
         15 . The subsea foundation system according to  claim 9 , wherein the subsea foundation comprises a suction anchor. 
     
     
         16 . The subsea foundation system according to  claim 9 , wherein the pull-in arrangement comprises one or more pull-in lines that extend through one or more or respective pull-in line conduits, wherein each pull-in line conduit extends through the subsea foundation. 
     
     
         17 . The subsea foundation system according to  claim 9 , wherein the pull-in arrangement comprises one or more pull-in lines, and a pull-in line grip for each pull-in line, wherein each pull-in line grip is located on top of the subsea foundation.