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
Cosmetic/dermatological compositions comprising naphthoic acid compounds and polyurethane polymers
Semiconductor device and fabrication method
SRB enhancement on HS-DSCH during cell change
Light-reflective anisotropic conductive paste and light-emitting device
Data encoding and decoding apparatus and method thereof for verifying data integrity
Low temperature pressure chamber unit, magnetic resonance device with a low temperature pressure chamber unit, and an attachment method to attach at least one add-on unit to an external housin
Method for implementing dynamic pseudorandom keyboard remapping
  Randomly Featured Patents
Method and device for detecting the position of a transparent moving conveyor belt
End-to-end design of electro-optic imaging systems with adjustable optical cutoff frequency
Printed electronic device and transistor device and manufacturing method thereof
Method and system for reducing nitrogen oxides and carbon loss from carbonaceous fuel combustion flue emissions
System and method to reduce uncertainty in procuring over-the-counter medication
Easy-open package
Shaving razor handle
Tool incorporating a locking swing bolt construction with associated method
Electrically heated electrochemical sensor construction, particularly to determine oxygen concentration in exhaust gases from combustion engines
Game machine circuit board case inspection method, and game board or game machine inspection method