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A blowout preventer with a main body; a base releasably connected to the main body, the base having a base space therein, the base having a ram shaft opening; a primary piston movably disposed within the base space; a ram shaft to which the primary piston is connected, the ram shaft including a ram

A blowout preventer with a main body; a base releasably connected to the main body, the base having a base space therein, the base having a ram shaft opening; a primary piston movably disposed within the base space; a ram shaft to which the primary piston is connected, the ram shaft including a ram end and a piston end; a ram connected to the ram end of the ram shaft; a housing connected to the base, the housing having a housing space therein, the housing including a middle member with a member opening; a booster piston movably disposed within the housing space and having a booster shaft projecting therefrom and a booster shaft space therein; the shaft including a push portion selectively movable to abut the ram shaft to prevent movement of the ram shaft and to transfer force of the booster piston to the primary piston; and power fluid apparatus for the primary piston and the booster piston.

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1. A blowout preventer comprisinga main body,a base releasably connected to the main body, the base having a base space therein, the base having a ram shaft opening,a primary piston movably disposed within the base space,a ram shaft to which the primary piston is connected, the ram shaft including a

1. A blowout preventer comprisinga main body,a base releasably connected to the main body, the base having a base space therein, the base having a ram shaft opening,a primary piston movably disposed within the base space,a ram shaft to which the primary piston is connected, the ram shaft including a ram end and a piston end,a ram connected to the ram end of the ram shaft,a housing connected to the base, the housing having a housing space therein, the housing including a middle member with a member opening,a booster piston movably disposed within the housing space, the booster piston including a booster shaft projecting therefrom, the booster shaft movable within the member opening, the booster shaft having a booster shaft space therein,the shaft including a push portion with part thereof within the booster shaft space, the push portion including an end portion movable with the booster piston to abut the piston end of the ram shaft to prevent movement of the ram shaft, the push portion positioned for transferring force of the booster piston to the primary piston upon abutment of the end portion with the piston end of the ram shaft, andfluid channel apparatus for directing power fluid to and from the primary piston and the booster piston.2. The blowout preventer of claim 1 further comprisinglocking apparatus within the booster shaft space for selectively holding the push portion against the ram shaft so that the combination of forces of force of the booster piston and force of the primary piston is maintained on the ram.3. The blowout preventer of claim 1 wherein the push portion includes a push piston movably disposed within the booster shaft space, the push piston having a push piston end movable to abut the piston end of the ram shaft.4. The blowout preventer of claim 2 wherein the locking apparatus includes a lock rod with a lock rod portion movably disposed within the push piston.5. The blowout preventer of claim 4 wherein the booster piston has a piston surface and the middle member having an abutment surface located such that said abutment surface contacts said piston surface when the booster piston reaches a limit of its stroke.6. The blowout preventer of claim 5 wherein, upon contact of the abutment surface with the piston surface, the locking sleeve is movable to move the push piston into contact with the piston end of the ram shaft so that force transfer between the booster piston and the primary piston is maintained.7. The blowout preventer of claim 6 wherein the lock rod is selectively rotatable to remove the force of the booster piston from the primary piston following selected action by the ram by backing off the push piston from the piston end of the ram shaft.8. The blowout preventer of claim 4 wherein a portion of the lock rod projects out from the housing and is manually rotatable with a suitable tool.9. The blowout preventer of claim 7 further comprisinga lock sleeve disposed above the push piston in the booster shaft space, the lock sleeve having a shearable lip projecting outwardly therefrom, said lip shearable against a part of the booster piston in response to force applied to the lock sleeve by the booster piston thereby permitting movement of the booster piston so that a force applied by the booster piston through the lock rod to the ram shaft is no longer applied to the ram shaft.10. The blowout preventer of claim 4 wherein the lock rod is connected to automatic lock rod rotation apparatus which automatically rotates the lock rod, the automatic lock rod rotation apparatus including a control system for controlling said rotation and a power system for providing power for said rotation.11. The blowout preventer of claim 4 wherein the push piston is selectively movable so that force of the booster piston is selectively removable from the primary piston.12. The blowout preventer of claim 1 further comprisingflow channel apparatus within the push piston for conducting power fluid to the booster piston so that the booster piston and the primary piston move simultaneously.13. A blowout preventer comprisinga main body,a base releasably connected to the main body, the base having a base space therein, the base having a ram shaft opening,a primary piston movably disposed within the base space,a ram shaft to which the primary piston is connected, the ram shaft including a ram end and a piston end,a ram connected to the ram end of the ram shaft,a housing connected to the base, the housing having a housing space therein, the housing including a middle member with a member opening,a booster piston movably disposed within the housing space, the booster piston including a booster shaft projecting therefrom, the booster shaft movable within the member opening, the booster shaft having a booster shaft space therein,the primary piston and the booster piston movably disposed for applying force to the ram shaft,a free floating push piston movably disposed in the booster shaft space,selective lock apparatus for selectively contacting the free floating push piston to selectively transfer force of the booster piston to the ram shaft and to selectively isolate the ram shaft from the booster piston, andfluid channel apparatus for directing power fluid to and from the primary piston and the booster piston.14. A blowout preventer comprisinga main body,a base releasably connected to the main body, the base having a base space therein, the base having a ram shaft opening,a primary piston movably disposed within the base space,a ram shaft to which the primary piston is connected, the ram shaft including a ram end and a piston end,a ram connected to the ram end of the ram shaft,a housing connected to the base, the housing having a housing space therein, the housing including a middle member with a member opening,a booster piston movably disposed within the housing space, the booster piston including a booster shaft projecting therefrom, the booster shaft movable within the member opening, the booster shaft having a booster shaft space therein,the shaft including a push portion with part thereof within the booster shaft space, the push portion including an end portion movable with the booster piston to abut the piston end of the ram shaft to prevent movement of the ram shaft, the push portion positioned for transferring force of the booster piston to the primary piston upon abutment of the end portion with the piston end of the ram shaft, andfluid channel apparatus for directing power fluid to and from the primary piston and the booster piston,locking apparatus within the booster shaft space for selectively holding the push portion against the ram shaft so that the combination of forces of force of the booster piston and force of the primary piston is maintained on the ram,wherein the push portion includes a push piston movably disposed within and freely floating within the booster shaft space, the push piston having a push piston end movable to abut the piston end of the ram shaft,wherein the locking apparatus includes a lock rod with a lock rod portion movably disposed within the push piston,wherein the booster piston has a piston surface and the middle member having an abutment surface located such that said abutment surface contacts said piston surface when the booster piston reaches a limit of its stroke,wherein,, upon contact of the abutment surface with the piston surface, the locking sleeve is movable to move the push piston into contact with the piston end of the ram shaft so that force transfer between the booster piston and the primary piston is maintained, andwherein the lock rod is selectively rotatable to remove the force of the booster piston from the primary piston following selected action by the ram by backing off the push piston from the piston end of the ram shaft.15. The blowout preventer of claim 4 wherein a portion of the lock rod projects out from the housing and is manually rotatable with a suitable tool, and the blowout preventer further comprisesa lock sleeve disposed above the push piston in the booster shaft space, the lock sleeve having a shearable lip projecting outwardly therefrom, said lip shearable against a part of the booster piston in response to force applied to the lock sleeve by the booster piston thereby permitting movement of the booster piston so that a force applied by the booster piston through the lock rod to the ram shaft is no longer applied to the ram shaft.16. A method for operating a blowout preventer, the method comprisingrotating a lock rod of a blowout preventer to lock a ram shaft in position, the blowout preventer comprisinga main body,a base releasably connected to the main body, the base having a base space therein, the base having a ram shaft opening,a primary piston movably disposed within the base space,a ram shaft to which the primary piston is connected, the ram shaft including a ram end and a piston end,a ram connected to the ram end of the ram shaft,a housing connected to the base, the housing having a housing space therein, the housing including a middle member with a member opening,a booster piston movably disposed within the housing space, the booster piston including a booster shaft projecting therefrom, the booster shaft movable within the member opening, the booster shaft having a booster shaft space therein,the shaft including a push portion with part thereof within the booster shaft space, the push portion including an end portion movable with the booster piston to abut the piston end of the ram shaft to prevent movement of the ram shaft, the push portion positioned for transferring force of the booster piston to the primary piston upon abutment of the end portion with the piston end of the ram shaft,fluid channel apparatus for directing power fluid to and from the primary piston and the booster piston,locking apparatus within the booster shaft space for selectively holding the push portion against the ram shaft so that the combination of forces of force of the booster piston and force of the primary piston is maintained on the ram,wherein the push portion includes a push piston movably disposed within the booster shaft space, the push piston having a push piston end movable to abut the piston end of the ram shaft, andwherein the locking apparatus includes a lock rod with a lock rod portion movably disposed within the push piston.17. The method of claim 16 wherein the blowout preventer includes the booster piston having a piston surface and the middle member having an abutment surface located such that said abutment surface contacts said piston surface when the booster piston reaches a limit of its stroke, and upon contact of the abutment surface with the piston surface the push piston moves to contact with the piston end of the ram shaft so that force transfer between the booster piston and the primary piston is maintained, the method further comprisingrotating the lock rod to move the push piston so that the push piston contacts the piston end of the ram shaft,thereby maintaining force transfer between the booster piston and the primary piston.18. The method of claim 17 wherein the blowout preventer includes lock rod selectively rotatable to remove the force of the booster piston from the primary piston following selected action by the ram by backing off the push piston from the piston end of the ram shaft, the method further comprisingrotating the lock rod to remove the force of the booster piston from the primary piston.19. The method of claim 16 wherein a lock sleeve is disposed above the push piston in the booster shaft space, the lock sleeve having a shearable lip projecting outwardly therefrom, said lip shearable against a part of the booster piston in response to force applied to the lock sleeve by the booster piston thereby permitting movement of the booster piston to remove force applied by the booster piston through the lock rod to the ram shaft, the method further comprisingshearing the shearable lip, andremoving the booster piston force from the primary piston.20. The method of claim 16 wherein the push piston is selectively movable so that force of the booster piston is selectively removable from the primary piston, the method further comprisingselectively moving the push piston to remove the booster piston force from the primary piston.