Horizontal tree assembly

Abstract

A horizontal spool tree assembly includes a spool body or housing 12 and a tubing hanger 18, 118, 218, 318 supporting a tubing string in a well. An internal tree cap 20, 120, 220, 320 is provided within the central bore in the spool body. In some embodiments, the tree cap includes a central bore in communication with a production bore through the tubing hanger and the lateral bore extending to a production port in the spool body. First and second closure members may be provided in the tree cap.

1 . A horizontal spool tree assembly for controlling fluid flow through a production tubing string within a subsea well, the production tubing string defining a tubing annulus surrounding the tubing string, the tree assembly comprising: 
 a spool body defining a spool body central bore for receiving a tubing hanger therein, the spool body including an annulus passageway extending laterally through at least a portion of the spool body for fluid communication between the tubing annulus and an annulus line;    the tubing hanger adapted to support the production tubing therefrom, the tubing hanger having a tubing hanger production bore extending axially therethrough for fluid communication between the production tubing string and a lateral port in the tubing hanger extending from the production bore and in communication with a production port extending laterally through at least a portion of the spool body to a production line;    a tree cap positioned within the central bore of the spool body above the tubing hanger and having a vertical bore therein; and    first and second closure members each received within the vertical bore in the tree cap for closing off flow through the tree cap.    
     
     
         2 . A horizontal spool tree assembly as defined in  claim 1 , further comprising: 
 a sleeve-shaped guide extending at least substantially between a lower face on the tree cap to an upper face on the tubing hanger and having a central guide passageway aligned with the tubing hanger production bore and the vertical bore in the tree cap.    
     
     
         3 . A horizontal spool tree assembly as defined in  claim 2 , wherein the sleeve-shaped guide has a side port therein substantially aligned with a crossover port in the spool body, the crossover port being selectively in fluid communication with the annulus line.  
     
     
         4 . A horizontal spool tree assembly as defined in  claim 2 , wherein the sleeve-shaped guide is secured to the tree cap, and extends downward into a pocket in the tubing hanger.  
     
     
         5 . A horizontal spool tree assembly as defined in  claim 2 , wherein the central guide passageway in the sleeve-shaped guide has a diameter substantially equal to the tubing hanger production bore.  
     
     
         6 . A horizontal spool tree assembly as defined in  claim 1 , further comprising: 
 a workover flow path extending at least partially through the spool body and fluidly connecting the central bore in the spool body above the tubing hanger to the tubing annulus.    
     
     
         7 . A horizontal spool tree assembly as defined in  claim 6 , further comprising: 
 a workover valve controlling fluid flow along the workover flow path.    
     
     
         8 . A horizontal spool tree assembly as defined in  claim 1 , further comprising: 
 a production valve positioned on the spool body for controlling fluid flow from the production port through the spool body to the production line.    
     
     
         9 . A horizontal spool tree assembly as defined in  claim 1 , further comprising: 
 the production bore in the tubing hanger having a substantially uniform diameter bore so as not to restrict fluid flow.    
     
     
         10 . A horizontal spool tree assembly as defined in  claim 1 , further comprising: 
 two or more axially spaced seals for sealing between the tree cap and the spool body.    
     
     
         11 . A horizontal spool tree assembly for controlling fluid flow through a production tubing string within a subsea well, the production tubing string defining a tubing annulus surrounding the tubing string, the tree assembly comprising: 
 a spool body defining a spool body central bore for receiving a tubing hanger therein, the spool body including an annulus passageway extending laterally through at least a portion of the spool body for fluid communication between the tubing annulus and an annulus line;    the tubing hanger adapted to support the production tubing therefrom, the tubing hanger having a tubing hanger production bore extending axially therethrough for fluid communication between the production tubing string and a lateral port in the tubing hanger extending from the production bore and in communication with a production port extending laterally through at least a portion of the spool body to a production line;    a tree cap positioned within the central bore of the spool body above the tubing hanger and having a vertical bore therein;    a crossover flow path extending from the spool body central bore upward through a portion of the tree cap, laterally through a port in the tree cap, through at least a portion of the spool body between upper and lower seals on the tree cap, and then through a crossover flow line in selective fluid communication with the annulus line;    a first closure member within one of the production bore in the tubing hanger and the vertical bore in the tree cap; and    a second closure member within the vertical bore in the tree cap for closing off flow through the tree cap.    
     
     
         12 . A horizontal spool tree assembly as defined in  claim 11 , wherein the crossover flow path extends laterally through the spool body.  
     
     
         13 . A horizontal spool tree assembly as defined in  claim 11 , further comprising: 
 a workover flow path extending at least partially through the spool body and fluidly connecting the central bore in the spool body above the tubing hanger to the tubing annulus.    
     
     
         14 . A horizontal spool tree assembly as defined in  claim 11 , further comprising: 
 a production valve positioned on the spool body for controlling fluid flow from the lateral production port through the spool body to the production line.    
     
     
         15 . A horizontal spool tree assembly as defined in  claim 11 , further comprising: 
 the production bore in tubing hanger having a substantially uniform diameter bore so as not to restrict fluid flow.    
     
     
         16 . A horizontal spool assembly tree assembly as defined in  claim 11 , wherein the production bore in the tubing hanger and the crossover flow path within the tree cap are each in communication with the central bore in the spool body between the tubing hanger and the tree cap.  
     
     
         17 . A horizontal spool tree assembly for controlling fluid flow through a production tubing string within a subsea well, the production tubing string defining a tubing annulus surrounding the tubing string, the tree assembly comprising: 
 a spool body defining a spool body central bore for receiving a tubing hanger therein, the spool body including an annulus passageway extending laterally through at least a portion of the spool body for fluid communication between the tubing annulus and an annulus line;    the tubing hanger adapted to support the production tubing therefrom, the tubing hanger having a tubing hanger production bore extending axially therethrough for fluid communication between the production tubing string and a production port through the spool body to a production line;    a tree cap positioned within the central bore of the spool body and having a vertical bore therein in fluid communication with the tubing hanger production bore, the tree cap having a lateral bore therein extending from the vertical bore in the tree cap to the production port through the spool body; and    first and second closure members each received within the vertical bore in the tree cap above the lateral bore in the tree cap for closing off flow through the tree cap.    
     
     
         18 . A horizontal spool assembly tree assembly as defined in  claim 17 , wherein a workover flow path extends from the spool body central bore above the tubing hanger laterally outward through at least a portion of the spool body and to the tubing annulus.  
     
     
         19 . A horizontal spool assembly tree assembly as defined in  claim 17 , wherein a workover flow path extends from the spool body central bore above the tubing hanger through a vertical bore in the tubing hanger offset from the production bore in the tubing hanger and then to the tubing annulus; and 
 a valve member positioned along the vertical bore in the tubing hanger.    
     
     
         20 . A horizontal spool tree assembly as defined in  claim 17 , further comprising: 
 a sleeve-shaped guide extending at least substantially from a lower face on the tree cap to an upper face on the tubing hanger and having a central guide passageway aligned with the tubing hanger production bore and the vertical bore in the tree cap.    
     
     
         21 . A horizontal spool tree assembly as defined in  claim 20 , further comprising: 
 the sleeve-shaped guide being secured to the tree cap and having a lower seal for sealing with the tubing hanger.    
     
     
         22 . A horizontal spool tree assembly as defined in  claim 21 , wherein the sleeve-shaped guide is secured to the tree cap, and extends downward into a pocket in the tubing hanger.  
     
     
         23 . A horizontal spool tree assembly as defined in  claim 20 , wherein the central guide passageway in the sleeve-shaped guide has a diameter substantially equal to the tubing hanger production bore.