Patent ID: 7621338

Claim:
A subsea well production tree comprising: a tree block having a production bore and an annulus bore, each of which has an upper end at an upper end of the tree block, the upper ends of the production bore and the annulus bore being isolated from each other by part of the tree block; an annular cavity at the upper end of the tree block surrounding the upper ends of the production and annulus bores, the annular cavity having an inner wall spaced radially outward from and isolated from the production bore by part of the tree block; a communication port extending through part of the tree block between the upper end of the annulus bore and the annular cavity and isolated from the production bore; a tree cap for fitting on top of the tree assembly, the tree cap comprising: a production bore mandrel extending from an upper portion of the tree cap down into the production bore such that a seal is formed inside the production bore; an annular sealing member extending from an upper portion of the tree cap down into the annular cavity such that the annular sealing member forms a seal between the communication port and the annular cavity; wherein the communication port comprises a communication gallery that extends through the inner wall of the annular cavity; the tree block further comprises a ring that is located above the upper end of the annulus bore and encircles the upper end of the production bore; and the inner wall of the annular cavity terminates below the ring, with the space between the ring and the inner wall of the annular cavity defining the communication gallery.