System and Method for Producing Through a Multi Bore Tubing Hanger to a Subsea Manifold Without BOP Modifications

Abstract

A system for producing hydrocarbons from a subsea wellbore includes a primary conductor extending into the seabed. In addition, the system includes a wellhead disposed at an upper end of the primary conductor. Further, the system includes a multi bore tubing hanger seated in the wellhead. Still further, the system includes a production tree mounted to the wellhead. The production tree includes a spool body and a production spool extending radially from the spool body. The production spool has an end comprising a connector. Moreover, the system includes a rotatable production guide base coupled to the primary conductor and configured to rotate about the wellhead. The production guide base includes a rigid alignment spool. The alignment spool has a first end releasably coupled to the production spool, a second end comprising a second connector, and non-linear deviation positioned between the first end and the second end.

What is claimed is: 
     
         1 . A system for producing hydrocarbons from a subsea wellbore, the system comprising:
 a primary conductor extending into the seabed;   a wellhead disposed at an upper end of the primary conductor;   a multi bore tubing hanger seated in the wellhead, the tubing hanger including at least a first bore and a second bore;   a production tree mounted to the wellhead, wherein the production tree includes a spool body, a first stabbing member extending from the spool body and disposed in the first bore, a second stabbing member extending from the spool body and disposed in the second bore, and a production spool extending radially from the spool body, wherein the production spool has an end comprising a connector;   a rotatable production guide base coupled to the primary conductor, wherein the production guide base is configured to rotate about the wellhead and releasably lock on to the upper end of the conductor, wherein the production guide base includes an annular connector disposed about the primary conductor, a support frame extending radially from the annular connector, and a rigid alignment spool mounted to the support frame;   wherein the alignment spool has a first end comprising a first connector releasably coupled to the connector of the production spool, a second end comprising a second connector, and non-linear deviation positioned between the first end and the second end.   
     
     
         2 . The system of  claim 1 , wherein the second connector of the alignment spool is coupled to an inlet end of a rigid jumper. 
     
     
         3 . The system of  claim 2 , wherein the jumper has an outlet end coupled to a manifold. 
     
     
         4 . The system of  claim 1 , wherein the alignment spool has a first section extending linearly from the first end to the deviation and a second section extending linearly from the second end to the deviation, wherein the first section is oriented at an angle a relative to the second section. 
     
     
         5 . The system of  claim 4 , wherein the angle a is greater than 90° and less than 180°. 
     
     
         6 . The system of  claim 1 , wherein the support frame is disposed about the annular connector. 
     
     
         7 . The system of  claim 1 , wherein the alignment spool includes a plurality of non-linear deviations. 
     
     
         8 . A method for completing a subsea well, the method comprising:
 (a) running a multi bore tubing hanger into a wellhead, the tubing hanger including a first bore and a second bore;   (b) determining the rotational orientation of the tubing hanger after (a);   (c) constructing an alignment spool based on the rotational position of the tubing hanger; and   (d) coupling the alignment spool to a rotatable production guide base, wherein the production guide base is configured to rotate about the wellhead.   
     
     
         9 . The method of  claim 8 , wherein (c) comprises constructing the alignment spool to include a non-linear deviation positioned between a first end of the alignment spool and a second end of the alignment spool. 
     
     
         10 . The method of  claim 9 , wherein the alignment spool has a first section extending from the first end to the deviation and a second section extending from the second end to the deviation, wherein the first section is oriented at an angle a relative to the second section. 
     
     
         11 . The method of  claim 10 , wherein the angle a is greater than 90° and less than 180°. 
     
     
         12 . The method of  claim 8 , wherein the rotatable production guide base includes an annular connector and a support frame extending radially from the annular connector; and
 wherein (d) comprises mounting the alignment spool to the support frame.   
     
     
         13 . The method of  claim 12 , further comprising:
 (e) lowering the rotatable production guide base subsea after (d);   (f) positioning the annular connector of the rotatable production guide base about the wellhead;   (g) rotating the production guide base about the wellhead after (f) to facilitate alignment of a first end of the alignment spool with a connector disposed at an end of a production spool of a production tree; and   (h) aligning a first stabbing member of a production tree with the first bore and aligning a second stabbing member of the production tree with the second bore.   
     
     
         14 . The method of  claim 13 , further comprising:
 (i) stabbing the first stabbing member into the first bore of the tubing hanger and stabbing the second stabbing member into the second bore of the tubing hanger; and   (j) connecting the connector of the production spool to the first end of the alignment spool.   
     
     
         15 . The method of  claim 14 , further comprising:
 (k) connecting an inlet end of a rigid jumper to the second end of the alignment spool; and   (l) connecting an outlet end of the rigid jumper spool to a subsea manifold.   
     
     
         16 . A method for completing a subsea well, the method comprising:
 (a) running a multi bore tubing hanger into a wellhead, the tubing hanger including a first bore and a second bore;   (b) constructing a rigid alignment spool after (a), wherein the alignment spool has a first end comprising a first connector and a second end comprising a second connector; and   (c) mounting the alignment spool to a support frame of a rotatable production guide base after (b), wherein the production guide base is configured to rotate about the wellhead.   
     
     
         17 . The method of  claim 16 , further comprising:
 (d) coupling the rotatable production guide base to the wellhead after (c).   
     
     
         18 . The method of  claim 16 , wherein the alignment spool includes a deviation positioned between the first end and the second end. 
     
     
         19 . The method of  claim 18 , wherein the alignment spool has a first section extending from the first end to the deviation and a second section extending from the second end to the deviation, wherein the first section is oriented at an angle a relative to the second section. 
     
     
         20 . The method of  claim 19 , wherein the angle a is greater than 90° and less than 180°. 
     
     
         21 . The method of  claim 19 , further comprising determining the angle a based on the rotational orientation of the tubing hanger within the wellhead. 
     
     
         22 . The method of  claim 21 , further comprising:
 (e) aligning a first stabbing member of a production tree with the first bore and aligning a second stabbing member of the production tree with the second bore;   (f) rotating the production guide base about the wellhead to align a first end of the alignment spool with a connector disposed at an end of a production spool of the production tree.   
     
     
         23 . The method of  claim 22 , further comprising:
 stabbing the first stabbing member into the first bore of the tubing hanger and stabbing the second stabbing member into the second bore of the tubing hanger; and   connecting the connector of the production spool to the first end of the alignment spool.   
     
     
         24 . The method of  claim 21 , further comprising:
 connecting an inlet end of a rigid jumper to the second end of the alignment spool; and   connecting an outlet end of the rigid jumper spool to a subsea manifold.