Breech block hanger support

Details Breech block hanger support Breech block hanger support

E - Fixed Constructions

21

B

166/49

E21B 43/12 (2006.01) E21B 33/043 (2006.01) F16J 15/12 (2006.01) E21B 33/00 (2006.01)

Patent

CA 1206091

A B S T R A C T The present invention relates to a breech block hanger support in a subsea wellhead assembly used in of offshore wells having a working pressure of up to approximately 15,000 psi. The wellhead assembly includes a wellhead, the breech block hanger support, a packoff for sealing the breech block hanger support, and one or more other casing hangers supported by the breech block hanger support. The breech block hanger support is landed and connected to the wellhead for suspending casing within the well, for supporting one or more of the other casing hangers and casing within the well, and for withstanding and containing the pressure load within the well. Breech block teeth are provided on the wellhead and the breech block hanger support to permit the hanger support to be stabbed into the wellhead and rotated less than 360° for completing the connection therebetween. The breech block teeth include groupings of spaced-apart no-lead teeth having slots provided therebetween. The breech block slots provide a natural flow way for the passage of well fluids. The breech block hanger support further includes an upper annular flange for arresting the downward movement of the breech block hanger support within the wellhead. This annular flange includes flutes aligned with the breech block slots for the passage of well fluids. The upper surface of the annular flange provides a bearing surface for supporting another casing hanger. The bearing surface of the hanger support will support all of the casing and tubing load and in addition thereto, withstand and contain the 15,000 psi working pressure. The bearing surface between the breech block teeth is greater than the bearing surface provided by the hanger support for the other casing hangers. The packoff is provided for sealing the breech block hanger support with the wellhead and other casing hangers. The packoff includes means for testing the integrity of the seals of the packoff.

421596

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