Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Diazeniumdiolated phosphorylcholine polymers for nitric oxide release
Management of memory array with magnetic random access memory (MRAM)
Generating agricultural information products using remote sensing
Rotating sunlight/light beam for fractional/beneficial use
Carrier for developing electrostatic charge image, developer for developing electrostatic charge image, image forming apparatus, and image forming method
Method and structure for image local contrast enhancement
Systems and methods for dissipating an electric charge while insulating a structure
  Randomly Featured Patents
Large capacity drainage receptacle
Cross address space thread control in a multithreaded environment
Method of teaching speech reading
Balanced multi-cavity injection molding of cable ties
Method and apparatus of locking closed a subsurface safety system
Reflection mask for projecting a structure onto a semiconductor wafer and method for producing the mask
System for floor number determination in buildings
Handling link failures in remote mirroring applications using snapshots
Apparatus for printing fixed and variable indicia
Electromagnetic wave energy seal arrangement