Backup Wellhead Blowout Prevention System and Method

摘要

A backup blowout assembly for a subsea wellhead that is positioned between an existing blowout preventer system and the wellhead. The backup blowout assembly includes an independently operated shear/blind ram assembly that attaches to a standard wellhead connector that connects to the wellhead. The ram assembly includes an upper neck with an upper flange on which a dual housing assembly is attached. The dual housing assembly includes a primary housing longitudinally aligned over a secondary housing. The primary and second housings include lower bodies and upper necks that have identical diameters. During assembly, the existing primary blowout assembly is initially connected to the primary housing and the ram assembly is connected to the wellhead connector. When a blowout occurs, the primary housing may be disconnected from the secondary housing to expose the upper neck of the secondary housing upon which a replacement primary blowout assembly system or cap may be attached.