Resources Contact Us Home
Annulus safety apparatus

Image Number 2 for United States Patent #4423782.

A hanger and valve assembly which can be employed as a safety valve assembly to close both the production tubing and the tubing-casing annulus in a subterranean well is disclosed. The assembly includes a hydraulically activated, mechanically locked hanger which has slip anchoring members engaging the casing or, exterior conduit for preventing movement in both longitudinal directions. The hanger also has annular packing elements to seal the tubing-casing annulus. An annulus safety valve member employing a longitudinally recessed resilient seal member can be mounted in a landing nipple mounted in the hanger. By recessing the seal it is protected from the turbulent flow through the valve. A second shuttle located in the landing nipple is employed in conjunction with the first annulus safety valve to permit flow in one direction while metering flow in the opposite direction. This assembly is especially useful for permitting the injection of treating fluids through the annulus and production through the tubing or inner conduit. A conventional safety valve is employed to prevent flow through the tubing when control pressure is lost or reduced. Both the valves and the hanger can be activated by control fluid pressure through the same control line. A setting sleeve which can be mounted in the annulus safety valve landing nipple prior to installation of the annulus safety valve can be used to permit the hanger to be set using control fluid pressure.

  Recently Added Patents
Engineered enzymes with methionine-gamma-lyase enzymes and pharmacological preparations thereof
Digital photographing apparatus, method of controlling the same, and recording medium for the method
System and method for efficient resource management of a signal flow programmed digital signal processor code
Titanium compounds and complexes as additives in lubricants
Pyrrolidine derivatives, pharmaceutical compositions containing the same, and methods of using the same
Nucleic acid-based tests for prenatal gender determination
Potential separation for filling level radar
  Randomly Featured Patents
System and method for embedding a view of a virtual space in a banner ad and enabling user interaction with the virtual space within the banner ad
Lubricating oil for refrigerator and hydraulic fluid composition for refrigerator using the same
Display screen with an animated avatar
Semiconductor devices with gate-source ESD diode and gate-drain clamp diode
Manifold type electro-magnetic valve
Suction mount apparatus holder
Mirror assembly
Method and apparatus for calibrating three-dimensional space for machine vision applications
Flexible seal to reduce optical component contamination
Adjustable-width seating for vehicles