Patent ID: 6109352
Filing Date: 2000-08-29
Classification: E21B

Abstract:
A sub-sea Xmas tree comprising,a wellhead connector,valve block means coupled to the wellhead connector and to a tree capsaid valve block means consisting of a housing which is generally cylindrical in shape defining a generally cylindrical interior and a dual bore sub-sea completion tree disposed within said housing, the sub-sea completion tree disposed within said housing, the sub-sea completion tree having a main production bore and an annulus bore substantially parallel to said main production bore, said annulus bore and said main bore extending from one end of the said completion tree to the other end, at least two valve elements disposed in series in said main bore and at least one valve element being disposed in said annulus bore, each of said valve elements being actuatable to move between an open and a closed position to allow fluid communication through said respective bores or to seal said bores,the tree cap adapted to be coupled to an upper end of said housing by an upper connector, said upper connector including communication means for facilitating communication to the annulus and production bores to allow communication and control of various operations, ROV override means, coupled to said communication means, for allowing overriding of normal valve control of said valve elements to move said valve elements between said open and said closed position.