Subsea completion with a wellhead annulus access adapter

1. A subsea completion assembly for a subsea well including installed casing and a wellhead, the assembly including:

a production casing forming a B annulus between the outside of the production casing and the installed casing; and

an annulus access adapter installed in the wellhead, the adapter including a valve controlling fluid communication with the fluid in the B annulus across the annulus access adapter;

the valve being selectively manipulatable between open and closed positions with the subsea completion assembly installed; and

where a property of the fluid in the B annulus can be monitored by fluid communicated across the annulus access adapter.

2. The subsea completion assembly of claim 1 , further including a subsea production tree including control equipment capable of manipulation of the annulus access adapter valve.

3. The subsea completion assembly of claim 1 , where the annulus access adapter includes:

an adapter body;

a retainer ring secured to the outside of the adapter body so as to form an annular cavity between them; and

the valve includes a sliding sleeve valve moveable within the cavity to control fluid communication across the annulus access adapter.

4. The subsea completion assembly of claim 1 , where the annulus access adapter includes an adapter body and the valve includes a shuttle valve moveable within a hole formed in the adapter body.

5. The subsea completion assembly of claim 4 , where the valve includes more than one shuttle valve moveable within more than one hole in the adapter body.

6. The subsea completion assembly of claim 1 , further including:

a production tubing forming an A annulus between the outside of the production tubing and the inside of the production casing; and

the annulus access adapter further including another manipulatable valve controlling fluid communication with the fluid in the A annulus across the annulus access adapter.

7. The subsea completion assembly of claim 1 , further including an isolation sleeve landable in the annulus access adapter to form an annular seal interface, the isolation sleeve including:

annulus fluid ports that can communicate fluid in the B annulus from the adapter; and

hydraulic fluid ports that can communicate hydraulic fluid to the annulus access adapter valve to operate the valve.

8. The subsea completion assembly of claim 1 , further including a production tubing supported by a production tubing hanger, the production tubing hanger including annulus fluid ports that can communicate fluid in the B annulus from the adapter.

9. The subsea completion assembly of claim 1 , further including a tieback tool landable in the annulus access adapter to form an annular seal interface, the tieback tool including:

annulus fluid ports that can communicate fluid in the B annulus from the adapter; and

hydraulic fluid ports that can communicate hydraulic fluid to the annulus access adapter valve to operate the valve.

10. A subsea completion assembly for a subsea well including installed casing and a wellhead, the assembly including:

a production casing forming a B annulus between the outside of the production casing and the installed casing;

a production tubing forming an A annulus between the outside of the production tubing and the inside of the production casing; and

an annulus access adapter installed in the wellhead, the adapter including a first manipulatable valve controlling fluid communication with the fluid in the B annulus across the annulus access adapter and a second manipulatable valve controlling fluid communication with the fluid in the A annulus across the annulus access adapter.

11. The subsea completion assembly of claim 10 , further including a subsea production tree including control equipment capable of manipulation of the first and second annulus access adapter valves.

12. The subsea completion assembly of claim 10 , where the annulus access adapter includes an adapter body and the first and second valves each include a shuttle valve moveable within a hole formed in the adapter body.

13. The subsea completion assembly of claim 12 , further including more than one first and second valves.

14. The subsea completion assembly of claim 10 , further including the production tubing supported by a production tubing hanger, the production tubing hanger including annulus fluid ports that can communicate fluid in the B annulus from the adapter.

15. A method of completing a subsea well including installed casing and a wellhead, the method including:

installing a production casing to form a B annulus between the outside of the production casing and the installed casing;

installing an annulus access adapter in the wellhead;

installing a production tubing to form an A annulus between the outside of the production tubing and the inside of the production casing; and

selectively controlling fluid communication of fluid in the B annulus across the annulus access adapter with the production tubing installed.

16. The method of claim 15 , further including:

installing a subsea tree; and

controlling fluid communication of fluid in the B annulus using control equipment in the subsea tree.

17. The method of claim 15 , further including:

the annulus access adapter including an adapter body and a retainer ring secured to the outside of the adapter body so as to form an annular cavity between them; and

controlling fluid communication includes moving a sliding sleeve valve within the cavity to open and close the valve.

18. The method of claim 15 , further including:

the annulus access adapter including an adapter body; and

controlling fluid communication includes moving a shuttle valve within a hole formed in the adapter body.

19. The method of claim 18 , where moving a shuttle valve includes moving more than one shuttle valve within more than one hole in the adapter body.

20. The method of claim 15 , further including:

controlling fluid communication of fluid in the A annulus across the annulus access adapter.

21. The method of claim 15 , further including:

landing an isolation sleeve in the annulus access adapter to form an annular seal interface;

communicating fluid in the B annulus from the adapter through the isolation sleeve; and

where controlling fluid communication further includes communicating fluid through the isolation sleeve to a valve in the annulus access adapter to control the valve.

22. The method of claim 15 , further including:

communicating fluid in the B annulus from the adapter through the production tubing hanger.

23. The method of claim 15 , further including:

monitoring a property of the fluid in the B annulus communicated across the annulus access adapter; and

adjusting a property of the fluid in the A annulus based on the value of the monitored property of the fluid in the B annulus.

24. A method of completing a subsea well including installed casing and a wellhead, the method including:

installing a production casing to form a B annulus between the outside of the production casing and the installed casing;

installing an annulus access adapter in the wellhead;

installing a tieback tool landable in the annulus access adapter to form an annular seal interface;

communicating fluid in the B annulus from the adapter through the tieback tool; \

selectively controlling fluid communication of fluid in the B annulus across the annulus access adapter; and

where controlling fluid communication further includes communicating fluid through the tieback tool to a valve in the annulus access adapter to control the valve.