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
Developing device
Methods and systems for temporarily sharing position data between mobile-device users
Promoting content
Bipolar junction transistor with a self-aligned emitter and base
Dry-cooling unit with gravity-assisted coolant flow
Image processing apparatus and image processing method
High-resolution, active reflector radio frequency ranging system
  Randomly Featured Patents
Sealing insert for the tight connection of two pipes
Graphical processing of object perimeter information
Cellular phone
Sense amplifier circuit for semiconductor memory
Music video game with guitar controller having auxiliary palm input
Apparatus for supporting workpieces in a multistage press
Optical multi-beam scanning device and image forming apparatus
Image data set with embedded pre-subpixel rendered image
Graphical user interface for a keyer