Function spool

1. A production assembly for controlling production from production tubing supported by a tubing hanger in a well including a wellhead, the assembly including:

a function spool engaged with the wellhead, the function spool including a bore;

a tree engaged with the function spool, the tree including a bore;

the tubing hanger being landable in the tree bore such that the production tubing is supported in the well by the tree;

a function mandrel separate from the tubing hanger, engaged with the production tubing, and positionable inside the function spool bore; and

the function mandrel including a passage connected to a line extending into the well and connectable with a port in the function spool such that communication with a downhole component through the line is allowable from outside the function spool.

2. The production assembly of claim 1 , wherein the lines line extending into the well includes an electrical, optical, orand hydraulic lines.

3. The production assembly of claim 1 , wherein the downhole component is selected from at least one of a downhole valve such as a surface-controlled subsurface safety valve (SCSSV), a temperature sensor, a downhole electric submersible pump (ESP), and a downhole processor.

4. The production assembly of claim 1 , further including the function mandrel being moveable vertically and rotationally with respect to the production tubing.

5. The production assembly of claim 1 , further including more than one downhole component and the function mandrel further including more than one passage connected to a line extending into the well, each passage connectable with a port in the function spool such that communication with the downhole components is allowable from outside the function spool.

6. The production assembly of claim 1 , wherein the function mandrel passage is connectable with the function spool port using a coupler selected from at least one of a vertical stab wet mate coupler and a horizontal stab wet mate coupler.

7. The production assembly of claim 1 , wherein the function mandrel is removable from and replaceable onto the production tubing.

8. The production assembly of claim 1 , wherein the tree and the function mandrel are installable using a floating deployment vessel including reduced lifting criteria.

9. The production assembly of claim 1 , further including:

the tubing hanger including a passage connecting a port in the tree with a second downhole component through a line; and

the size and/or weight of the tree and the tubing hanger being minimized by allowing communications with the downhole components through both the tubing hanger and the function mandrel.

10. A method of communicating with a component downhole in a well including a wellhead, the well designed for production using production tubing connected to a tubing hanger, the method including:

installing a function spool and a tree onto the wellhead, the function spool and tree each including a bore;

landing the tubing hanger in the tree bore to support the production tubing in the well;

positioning a function mandrel separate from the tubing hanger and engaged with the production tubing within the function spool;

connecting a passage in the function mandrel with a port in the function spool to establish communication with a component downhole connected with the function mandrel through a line; and

communicating with the downhole component from outside the function spool through the spool port and the function mandrel passage.

11. The method of claim 10 , wherein communicating with the downhole component includes at least one of communicating electrical power, data, and hydraulic pressure.

12. The method of claim 10 , wherein communicating with the downhole component includes at least one of controlling a downhole valve, receiving data from a downhole sensor, controlling a downhole pump, and controlling a downhole processor.

13. The method of claim 10 , further allowing the function mandrel to move vertically and rotationally with respect to the production tubing.

14. The method of claim 10 , further including:

connecting multiple mandrel passages with spool ports, each passage connected with a downhole component through a line; and

communicating with the downhole components from outside the function spool through the spool ports and the function mandrel passages.

15. The method of claim 10 , further including connecting the mandrel passage with the spool port using a coupler selected from at least one of a vertical stab wet mate coupler and a horizontal stab wet mate coupler.

16. The method of claim 10 , further including removing the function mandrel and replacing the function mandrel with a different function mandrel designed to communicate with a different downhole component.

17. The method of claim 16 , further including removing the tubing hanger, production tubing, and downhole component, replacing the function mandrel and installing the different downhole component and the tubing hanger and production tubing with the different function mandrel.

18. The method of claim 10 , further including installing the function spool and tree using a floating deployment vessel including reduced lifting criteria.

19. The method of claim 10 , including communicating with a second downhole component from outside the tree through a connection in the tubing hanger connecting a port in the tree with the second downhole component using a line.

20. The method of claim 19 , further including minimizing the size and/or weight of the tree and tubing hanger by communicating with the downhole components through both the tubing hanger and the function mandrel.