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
Method for parking or exiting a parking bay and for avoiding a collision of a vehicle, and corresponding assistance systems and vehicle
Monitoring heap in real-time by a mobile agent to assess performance of virtual machine
Detection of code-based malware
Creating and manufacturing documents that initially exceed equipment finishing capacity
Systems and methods for managing and utilizing excess corn residue
Single mode optical fiber with improved bend performance
Optical switching device and communications system
  Randomly Featured Patents
Structure to achieve thermally stable high sensitivity and linear range in bridge GMR sensor using SAF magnetic alignments
Apparatus for the production of meat products
Condition response differential vacuum regulator and method of making the same
Integrated circuit with an access-controlled data memory
Methods and apparatus for rotor blade ice detection
Card destruction systems and methods
Tape sensing device for magnetic tape recording and/or reproducing apparatus
Bi-directional read while write magnetic head assembly having a wear avoidance contour
Methods for detecting humans
Liquid nutritional product