Abstract: A well system in which a dual annular type valve with wall flow ports, operable by ambient pressures, is utilized as part of the well tool string to provide an unrestricted flow path for production through and prevent excess back pressure on the producing formation. The valve has outside seals and internal valves above and below the wall ports controlling flow therethrough. Higher pressure outside the valve will open the biased closed lower sleeve valve to production flow through the wall ports into the flow path through the well production tubing. If pressure in the flow path through increases, both valves close preventing flow out through the wall ports. Increasing flow path pressure to a predetermined value shears lower valve seat positioning pins to open wall flow ports to high volume flow pumped into the formation to kill the well and to two-way flow afterward.

Abstract: A method and apparatus especially adapted for use with an injection well in which a valve controlled H-member interconnects the two tubings of a two tubing installation and landing nipples are attached to the lower legs of the H-member to receive expendable fluid control means, such as standing valves, in which pressure applied to one tubing to create a pressure differential will move the valve controlling the interconnection between the H-members to open position to permit TFL operations to be carried out in the well and thereafter pressure exerted on a ball supported on the valve member of the control valve for the H-member closes the control valve, and the ball passes through the control valve. The fluid control members in the landing nipples may be ejected either before or after closing of the valve in the H-member.