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
Pandemic protocol for emergency dispatch
Scalable security services for multicast in a router having integrated zone-based firewall
Method and structure of forming backside through silicon via connections
Image processing device, image processing method, and program
Method and device for determining a set of frequencies that can be used for transmitting information between radio transceivers of a network operating with frequency hopping
Front end for RF transmitting-receiving systems with implicit directional control and time-multiplexing method in submicron technology
Combination for composite layered chip package
  Randomly Featured Patents
Digital sound reproducing and editing device with variable-speed continuous sound reproduction
Camera body and imaging device equipped with same
Evacuated building panel and roof deck
Traffic estimation
Rocking bearing
Coupler for connecting two plastic pipes and process and mold for producing the coupler
Method of making silicon controlled rectifier with a variable base-shunt resistance
Substituted sulfonamides
Systems and methods for modeling three-dimensional objects from two-dimensional images
Call routing based on local status evaluation