Tubing hanger with annulus bore

Abstract

A completion system for a subsea well includes a tree having a generally cylindrical wall forming an internal bore therethrough and a production port extending laterally through the wall in communication with the internal bore. The internal wall has a landing arranged to support a tubing hanger having seals for sealing the production port between the tubing hanger and the internal wall, the production port being arranged to communicate with a lateral production fluid outlet port in the tubing hanger. A workover port extends laterally from an opening in the internal wall below the production port and the production port seals and a tubing annulus seal sealing the workover port from the tubing annulus. A tubing annulus port extends from an opening in the tree below the tubing annulus seal and the tubing annulus port and workover port being arranged to be in fluid communication externally of the internal bore.

What is claimed is: 
     
       1. An assembly for a subsea well, the assembly comprising:
 a tree body having a generally cylindrical wall forming an internal bore therethrough and a production outlet extending laterally through said wall in communication with said internal bore; 
 said internal wall having a landing arranged to support a tubing hanger, the tubing hanger having first seals sealing the production outlet between the tubing hanger and said internal wall, said production outlet arranged to communicate with a lateral production passageway in the tubing hanger; 
 a workover port extending laterally from a workover port opening in said internal wall; 
 said workover port opening being located below said first seals; 
 said tubing hanger having a second seal below said workover port opening sealing between the tubing hanger and said internal wall; 
 a tubing annulus passageway extending from an opening in said tree body below said second seal; and 
 said tubing annulus passageway and workover port being arranged to be in fluid communication externally of said internal bore. 
 
     
     
       2. The assembly of  claim 1  wherein said tubing hanger includes a annulus bore in communication with said workover port. 
     
     
       3. The assembly of  claim 2  wherein said annulus bore communicates with an area above said tubing hanger. 
     
     
       4. The assembly of  claim 2  further including a flow passageway extending from said annulus bore to a choke or kill line. 
     
     
       5. The assembly of  claim 4  further including a circulation path extending through said tubing hanger, tubing, tubing annulus, tubing annulus passageway, workover passageway, annulus bore, flow passageway and choke or kill line. 
     
     
       6. The assembly of  claim 2  further including a tool having an annulus outlet in communication with said annulus bore. 
     
     
       7. The assembly of  claim 6  wherein said annulus outlet communicates with a choke or kill line. 
     
     
       8. The assembly of  claim 2  further including a closure member sealing said internal bore above said tubing hanger. 
     
     
       9. The assembly of  claim 8  wherein said closure member includes a flow passageway therethrough communicating with said annulus bore. 
     
     
       10. A flow completion apparatus for controlling the flow of fluid through a tubing string which extends into a well bore and defines a tubing annulus surrounding the tubing string, the flow completion apparatus comprising:
 a wellhead housing which is installed at the upper end of the well bore; 
 a tubing spool which is connected over the wellhead housing and which includes a central bore that extends axially therethrough, a production outlet which communicates with the central bore, and an annulus passageway which communicates with the tubing annulus; 
 a tubing hanger which is supported in the central bore, is connected to an upper end of the tubing string, and includes a production bore which extends axially therethrough and a production passageway which communicates between the production bore and the production outlet; 
 a first closure member which is positioned in the production bore above the production passageway; 
 a seal which is positioned between the tubing hanger and the central bore below the production passageway; 
 a workover passageway in the tubing spool which extends between the annulus passageway and a portion of the central bore that is located below the seal; 
 an annulus bore in the tubing hanger which extends between the workover passageway and the upper end of the tubing hanger; and 
 a fluid passageway extending between the tubing annulus and the upper end of the tubing hanger being established through the annulus passageway, the workover passageway and the annulus bore. 
 
     
     
       11. An assembly for a subsea well, the assembly comprising:
 a tree body having a generally cylindrical wall forming an internal bore therethrough and a production outlet extending laterally through said wall in communication with said internal bore; 
 said internal wall having a landing arranged to support a tubing hanger having a production bore therethrough, the tubing hanger having first seals sealing the production outlet between the tubing hanger and said internal wall, said production outlet arranged to communicate with said production bore through a lateral production passageway in the tubing hanger; 
 a workover port extending laterally from a workover port opening in said internal wall; 
 said workover port opening being located below said first seals; 
 said tubing hanger having a second seal below said workover port opening sealing between the tubing hanger and said internal wall and said tubing hanger having an annulus bore in communication with said workover port opening; 
 a tubing annulus passageway extending from an opening in said tree body below said second seal; 
 said tubing annulus port and workover port being arranged to be in fluid communication externally of said internal bore; and 
 a bypass passageway in said tubing hanger communicating said annulus bore with said production bore. 
 
     
     
       12. The assembly of  claim 11  further including a flow control member controlling flow through said bypass passageway. 
     
     
       13. The assembly of  claim 12  wherein said flow control member includes an actuator extending through said tubing hanger and tree. 
     
     
       14. An assembly for a subsea well, the assembly comprising:
 a tree body having a generally cylindrical wall forming an internal bore therethrough and a production outlet extending laterally through said wall in communication with said internal bore; 
 said internal wall having a landing arranged to support a tubing hanger; 
 a production member disposed in said internal bore on said tubing hanger and having first seals sealing the production outlet between the production member and said internal wall, said production outlet arranged to communicate with a lateral production passageway in said production member; 
 a workover port extending laterally from a workover port opening in said internal wall; 
 said workover port opening being located below said first seals; 
 said tubing hanger having a second seal below said workover port opening sealing between the tubing hanger and said internal wall; 
 a tubing annulus passageway extending from an opening in said tree body below said second seal; and 
 said tubing annulus port and workover port being arranged to be in fluid communication externally of said internal bore. 
 
     
     
       15. An assembly for a subsea well, the assembly comprising:
 a tree body having a generally cylindrical wall forming an internal bore therethrough and a production outlet extending laterally through said wall in communication with said internal bore;   said internal wall having a landing arranged to support a tubing hanger, said tubing hanger having a first seal sealing between said tubing hanger and said internal wall above said production outlet and a second seal sealing between said tubing hanger and said internal wall below said production outlet, said production outlet arranged to communicate with a lateral production passageway in said tubing hanger;   a workover port extending laterally from a workover port opening in said internal wall;   said workover port opening being located below said first seal;   said tubing hanger having a third seal below said workover port opening sealing between said tubing hanger and said internal wall;   a tubing annulus passageway extending from an opening in said tree body below said third seal; and   said tubing annulus passageway and workover port being arranged to be in fluid communication externally of said internal bore.   
     
     
       16. A well production assembly located at an upper end of a string of tubing extending into a well and including a blowout preventer with a choke or kill line, comprising:
 a production tree having a longitudinal axis, an axial bore and a lateral production passage, the lateral production passage having an inlet at the bore and extending laterally through a sidewall of the production tree;   a tubing hanger landed in the axial bore and adapted to be located at an upper end of a string of tubing, the tubing hanger having a vertical production passage extending axially through the tubing hanger and a lateral production passageway which extends laterally from the vertical production passage through the tubing hanger and has an outlet at the exterior of the tubing hanger which registers with the inlet of the lateral production passage of the production tree;   a member closing the tubing hanger vertical production bore from the production tree axial bore, the member, tubing hanger, production tree, and blowout preventer forming an area therebetween; and   the tubing hanger having an annulus passage extending through the tubing hanger offset from the vertical production passage, the annulus passage having a lower end adapted to be in flow communication with a tubing annulus surrounding the string of tubing and an upper end extending through the tubing hanger in flow communication with the area.   
     
     
       17. The well production assembly of claim 16 wherein the area is in flow communication with the choke or kill line. 
     
     
       18. A well production assembly located at an upper end of a string of tubing extending into a well, comprising:
 a production tree having a longitudinal axis, an axial bore and a lateral production passage, the lateral production passage having an inlet at the bore and extending laterally through a sidewall of the production tree;   a tubing hanger landed in the axial bore and adapted to be located at an upper end of a string of tubing, the tubing hanger having a vertical production passage extending axially through the tubing hanger and a lateral production passageway which extends laterally from the vertical production passage through the tubing hanger and has an outlet at the exterior of the tubing hanger which registers with the inlet of the lateral production passage of the production tree;   a first closure member closing the tubing hanger vertical production bore from the production tree axial bore;   a second closure member installed in the production tree axial bore above the tubing hanger, the second closure member, tubing hanger, and production tree forming an area therebetween; and   the tubing hanger having an annulus passage extending through the tubing hanger offset from the vertical production passage, the annulus passage having a lower end adapted to be in flow communication with a tubing annulus surrounding the string of tubing and an upper end extending through the tubing hanger in flow communication with the area.