Patent ID: 8256538

Claim:
A containment valve assembly that provides a means for oil/gas control and stoppage up and through a well riser pipe, that utilizes the intense pressure in the well to activate a stop flow plug and drives this plug to the close position where it holds for containment of the oil/gas being driven to the surface, a) the containment valve assembly that is attached and mounted on the lower end of a drill string tool by engagement with recess pockets holding the containment valve for extension down inside of the well riser pipe, b) an extension post that is attached to the end of the drill string tool, that provides a means for extending and holding down the stop flow plug in an open oil/gas flow location where intense well pressure is driving the stop flow plug to a close position, c) the stop flow plug that contains a coned nose shape that matches a coned shaped cavity in an inner guide rail support structure that guides the plug movement upward to a complete stop flow location, d) the stop flow plug that operates as a piston with intense pressure from the oil/gas in the riser pipe driving the plug upward with the escaping oil/gas in the riser pushing against the plug's base surface, e) the stop flow plug that contains passages at its base to funnel oil/gas under intense pressure to an adjacent means for controlling the attachment of the valve to the inside surface of the riser pipe, f) the stop flow plug that contains a means for alignment control in its nose shape to accept centering contact of the extension tool and its extension post to ensure alignment of the nose cone shape with the cavity's cone shape on closure, g) the stop flow plug of mass and length that can move up and down on the internal guide rail surface without constraint, and when moved to an upward flow close location the exchange in location can close off the oil/gas intense flow through the valve and up the riser pipe, as well as close off all flow to the adjacent mechanism, h) the stop flow plug that is captured in the valve with a close out plate at its base that aligns to internal guide rail surfaces and accepts intense well pressure in compression, whereas the attachment fasteners receive none of the intense pressure utilized for flow control and capture, i) the stop flow plug whose internal guide rail is attached to the valve's outer structure with structural guide rail high strength capture pins that position and control operating freedom of movement of the stop flow plug, and retention of the cone cavity structure that receives and accepts intense pressure from the oil/gas flow through the valve.