Patent Number: 6,293,345

Title: Apparatus for subsea wells including valve passageway in the wall of the wellhead housing for access to the annulus

Abstract: Apparatus is disclosed for use in drilling and completing a subsea well of the type in which a blowout preventer stack positioned on a floating rig is connected to the well by a drilling riser, and wherein the flow of well fluid between the tubing/casing annulus and the upper end of the wellhead is controlled by valves means within passageway in a relatively thick walled upper portion of the housing above a relatively thin walled portion thereof in which a casing hanger is installed.

Inventors: Watkins; Bruce J. (Houston, TX)

Assignee: Dril-Quip, Inc.

International Classification: E21B 33/03 (20060101); E21B 33/035 (20060101); E21B 33/043 (20060101); E21B 034/04 ()

Expiration Date: 09/25/2018