Resources Contact Us Home
Subsea wellhead with annulus communicating system

Image Number 2 for United States Patent #4887672.

An improved subsea wellhead including a wellhead housing landed at a subsea well location and having a plurality of hangers landed therein, each of the hangers having a seal assembly to define an annulus in the area between the exterior of the hanger and the interior of the wellhead housing below the seal provided by the seal assembly and a passage in said wellhead housing communicating with each of the annuli, the passages extending through the wellhead housing and communicating with the space above the upper surface of the wellhead housing, a spool connected to the upper end of the wellhead housing, inner and outer seals between the upper end of the wellhead housing and the spool to define the space into which the passages communicate, a passage extending upward through the spool to communicate the pressure changes in the space between the spool and wellhead housing to the surface, and check valves in each of the passages allowing flow upwardly therethrough and preventing flow downwardly therethrough to isolate each of the annuli from the other annuli. In a modified form individual passages with suitable sealing means are provided for each of the wellhead housing passages.

  Recently Added Patents
Imaging lens with three lens elements, and electronic apparatus having the same
Washing machine
Transfer device and image forming apparatus including regulation member
Automatically capturing images that include lightning
Electronic control apparatus
Storage system with LU-setting function
Memory access monitoring method and device
  Randomly Featured Patents
Pre-aligning a substrate in a lithographic apparatus, device manufacturing method, and device manufactured by the manufacturing method
Instrumentation for inserting and impacting an artificial intervertebral disc in an intervertebral space
Injection spray gun with adjustable pressure limitation
Wireless communication apparatus and wireless communication method
Laser line generating device
Process for removal of sulfur compounds from gases
Communication apparatus
Bifunctional molecules for delivery of therapeutics
Gas gun having a pressure driving device
Fill line indicator for food storage container