Abstract: A method of forming a metal-to-metal seal in high pressure applications with low contact stress. Firstly, providing a first elongate pressure containment member having a surface of revolution. Secondly, providing a second elongate pressure containment member having an exterior surface, an interior surface, a remote end, and a thin walled extension sleeve having a first end and a second end. The first end of the thin walled extension sleeve is conjoined with the second elongate pressure member at the remote end. The second elongate pressure containment member is of a greater thickness than the sleeve. Thirdly, coupling the first elongate pressure containment member and the second elongate pressure containment member with the sleeve positioned in close relation to the surface of revolution.

Abstract: A method of forming a metal-to-metal seal in high pressure applications with low contact stress. Firstly, providing a first elongate pressure containment member having a surface of revolution. Secondly, providing a second elongate pressure containment member having an exterior surface, an interior surface, a remote end, and a thin walled extension sleeve having a first end and a second end. The first end of the thin walled extension sleeve is conjoined with the second elongate pressure member at the remote end. The second elongate pressure containment member is of a greater thickness than the sleeve. Thirdly, coupling the first elongate pressure containment member and the second elongate pressure containment member with the sleeve positioned in close relation to the surface of revolution.

Abstract: A method for downhole separation of oil and water within a production fluid downhole in an oil well, includes providing a cyclone separator connected to the outlet of a downhole pump or two or more cyclone separators mounted within a housing and connected to the outlet of a downhole pump. One outlet of the separator or housing is connected to a conduit for transporting the lower density stream to the surface and the second outlet of the separator or housing is connected to a conduit for transporting the higher density stream to an underground formation. The pre-separator downhole pump is preferably selected to maintain dissolved gases in solution while production fluids are within the pump and separators and prevent gas breakout from occurring.