Patent ID: 8881829
Filing Date: 2014-11-11
Classification: E21B,F16K

Abstract:
1. A system for allowing the replacement of a blowout preventing system or capping a subsea wellhead which are used with a subsea drilling operation that includes a wellhead with a primary blowout preventing system positioned above or attached to the wellhead, the system comprising: a. a wellhead connector configured to be attached to said wellhead, said wellhead connector includes an upper connection flange; b. a shear/blind ram assembly that includes a main body, a perpendicularly aligned lower neck and a perpendicularly aligned upper neck, said main body includes a fluid bore and two opposite ram units on opposite sides of said fluid bore that when activated discontinues the flow of a fluid through said fluid bore, said lower neck includes a perpendicularly aligned lower connection flange and said upper neck includes a perpendicularly aligned upper connection flange, said shear/blind ram assembly being aligned over said wellhead connector so said lower connection flange on said lower neck is placed over and adjacent to said upper connection flange on said wellhead connector; c. a dual housing assembly that includes an upper primary housing longitudinally aligned and stacked over a lower secondary housing, said primary housing includes a wide cylindrical first lower body, a narrow cylindrical first upper neck and a longitudinally aligned bore, said first lower body on said primary housing includes a recessed cavity, said first upper neck extends upward and configured to connect to said primary blowout preventing system located above said dual housing assembly, said secondary housing includes a wide cylindrical second lower body and a narrow-cylindrical second upper neck and a longitudinally aligned bore, said second upper neck on said secondary housing configured to extend into said recessed cavity on said first lower body of said primary housing when said primary housing is longitudinally aligned over said secondary housing, said second upper neck on said secondary housing being the same diameter as said first upper neck on said primary housing and configured to connect to said primary blowout preventing system when exposed after removing said primary housing from said secondary housing, said first lower body on said primary housing includes a lower flange surface and said secondary housing includes an upper flange surface and a lower flange surface, said upper flange surface on said secondary housing is configured to be aligned with said lower flange surface on said primary housing when said second upper neck on said secondary housing is inserted into said recessed cavity located in said first lower body of said primary housing, said lower flange surface on said secondary housing is configured to be aligned with said upper connection flange on said upper neck on said shear/blind ram assembly; d. a first set of connectors used to selectively attach said lower connection flange on said ram assembly to said upper connection flange on said wellhead connector; e. a second set of connectors used to selectively attach said lower flange surface on said secondary housing to said upper connection flange on said shear/blind ram assembly; and, f. a third set of connectors used to selectively attach said lower flange surface on said primary housing to said upper flange surface on said secondary housing.