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A reinforcing element for an elastomeric sealing element for use within a well casing and passable through production tubing is formed of two metallic plate members having a plurality of radially extending projections, and the radially extending projections are bent and joined to one another to allo

A reinforcing element for an elastomeric sealing element for use within a well casing and passable through production tubing is formed of two metallic plate members having a plurality of radially extending projections, and the radially extending projections are bent and joined to one another to allow the reinforcing element to be passed through production tubing. A demand sensitive pressure intensifier for use with a hydraulic fluid pump and passable through production tubing has a means for compressing hydraulic fluid to a pressure which exceeds the maximum output pressure of the pump, and the compression means is selectively actuated when the output pressure of the pump reaches a predetermined pressure value.

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1. A reinforcing element for an elastomeric sealing element for use within a well casing and passable through production tubing, the diameter of the production tubing being smaller than the diameter of the well casing, comprising: upper and lower metallic plate members, each plate member having: a

1. A reinforcing element for an elastomeric sealing element for use within a well casing and passable through production tubing, the diameter of the production tubing being smaller than the diameter of the well casing, comprising: upper and lower metallic plate members, each plate member having: a center portion with an axial passageway extending therethrough and adapted for receipt of an elongate mandrel; and a plurality of radially extending projections having first and second ends, each first end being formed integral with the center portion; each of the projections being bent downwardly to dispose each projection in a plane which is substantially perpendicular to the center portion of the plate member, the projections of the upper plate member disposed below the center portion of the upper plate member and the projections of the lower plate member disposed above the center portion of the lower plate member; and the second ends of at least two of the projections for each plate member being fixedly secured to second ends of corresponding projections of the other plate member, whereby the plate members form an elongate body which can pass through the projection tubing and upon exertion of a compressive force on the center portions, the projections are disposed in a plane substantially parallel to the center portion of each plate member. 2. The reinforcing element of claim 1, wherein each plate member has eight projections and the second ends of four of the projections of each plate member are fixedly secured to second ends of corresponding projections of the other plate member. 3. The reinforcing element of claim 1 wherein each second end of a projection which is fixedly secured to another second end of a projection is fixedly secured by a spot weld. 4. The reinforcing element of claim 3, wherein each second end of a projection which is fixedly secured to another second end of a projection has a weld relief means, comprised of a slot disposed on both sides of the spot weld. 5. The reinforcing element of claim 1, wherein an even number of projections extend from the center portion of each plate member; a first set of alternating projections are first bent downwardly and disposed in a plane which is substantially perpendicular to the center portion; and a second set of the remaining alternating projections are bent downwardly and disposed in a plane which is substantially perpendicular to the center portion and in an overlying relationship with the first set of projections. 6. The reinforcing element of claim 5, wherein the second ends of the first set of alternating projections of each plate member are fixedly secured to corresponding second ends of the first set of alternating projections of the other plate member. 7. The reinforcing element of claim 1, wherein a spacer member having an axial passageway therethrough is disposed adjacent the second ends of the projections of each plate member. 8. A demand sensitive pressure intensifier for use with a hydraulic fluid pump, having a maximum output pressure, and associated with a down-hole tool which is passable through production tubing, comprising: a first housing; a means for transmitting a force, associated with the housing to move a portion of the down-hole tool, the force transmitting means having a first fluid pressure receiving surface associated therewith; a first hydraulic fluid passageway extending through the housing and in fluid communication between the pump and the first fluid pressure receiving surface associated with the force transmitting means; means for compressing hydraulic fluid disposed in the first hydraulic fluid passageway to increase the fluid pressure, exerted upon the first fluid pressure receiving surface associated with the force transmitting means, to a pressure which exceeds the maximum output pressure of the pump; and means for selectively actuating the compression means when the output pressure of the pump reaches a predetermined pressure value below the maximum output pressure of the pump, the selective actuation means including: a second fluid pressure receiving surface associated therewith; and a second hydraulic fluid passageway in fluid communication with the pump and the second fluid pressure receiving surface, whereby upon fluid pressure, acting upon the second fluid pressure receiving surface associated with the selective actuation means, reaching a predetermined pressure value below the maximum output pressure of the pump, the compression means is actuated and fluid pressure, greater than the maximum pressure output of the pump, selectively acts upon the first fluid pressure receiving surface associated with the force transmitting means. 9. The demand sensitive pressure intensifier of claim 8, wherein the compression means includes a hydraulic cylinder and a cooperating piston assembly, the first hydraulic fluid passageway extending through the piston assembly and the hydraulic cylinder. 10. The demand sensitive pressure intensifier of claim 9, wherein the hydraulic cylinder is disposed within the force transmitting means, and coextensive with the longitudinal axis of the force transmitting means, the force transmitting means comprising a generally cylindrical lower intensifier head disposed in sliding engagement with a portion of a housing for the down-hole tool. 11. The demand sensitive pressure intensifier of claim 10, wherein the first fluid pressure receiving surface comprises a seal disposed about the outer surface of the lower intensifier head in sealing engagement with the down-hole tool housing. 12. The demand sensitive pressure intensifier of claim 10, wherein the piston assembly includes a carrier piston, having first and second ends, with a lower piston disposed in sliding engagement with the second end of the carrier piston, the lower piston being disposed in sliding and sealing engagement with the hydraulic cylinder. 13. The demand sensitive pressure intensifier of claim 12, wherein the first end of the carrier piston has a seal disposed about its outer surface in sealing engagement with the first housing and the seal comprises the second fluid pressure receiving surface associated with the selective actuation means. 14. The demand sensitive pressure intensifier of claim 13, wherein the first end of the carrier piston has a collet member secured thereto, which collet member has a plurality of collet fingers releasably secured within the first housing, whereby upon exertion of the predetermined pressure value of the pump output pressure upon the second seal, the collet fingers are released and the collet, carrier piston and lower piston are actuated to compress the hydraulic fluid in the hydraulic cylinder. 15. The demand sensitive pressure intensifier of claim 14, wherein the upper end of the first housing is sealed by an upper intensifier head which has an elongate alignment stop member, having first and second ends, secured thereto, and the collet fingers are releasably secured to the alignment stop member. 16. The demand sensitive pressure intensifier of claim 15, including a means for restroking the compression means, which restroking means comprises an elongate stem disposed within the alignment stop member, a poppet disposed within a poppet cylinder formed in the carrier piston, and a releasable connection means secured to the stem and poppet and which cooperates with the carrier piston, whereby upon the stem moving downwardly into engagement with the second end of the alignment stop member, movement of the carrier piston and lower piston continues downwardly and the stem and poppet are released from the carrier piston and cease their downward movement. 17. The demand sensitive pressure intensifier of claim 16, wherein the releasable connection means comprises a body member fixedly secured to the poppet and stem, and at least two spring biased balls which cooperate with at least two sets of mating detents formed within the first end of the carrier piston. 18. The demand sensitive pressure intensifier of claim 16, wherein the carrier piston has a return spring bearing against the carrier piston and the lower intensifier head, which spring biases the carrier piston upwardly, and the carrier piston has at least one restroking hole in fluid communication with the poppet cylinder and a hydraulic fluid reservoir associated with the pump, whereby upon the release of the stem and poppet from the carrier piston, fluid pressure acting upon the second fluid pressure receiving surface is vented through the restroking hole and the return spring forces the carrier piston upwardly to reseat the collet fingers on the alignment stop member and to reconnect the stem and poppet to the carrier piston to seal the restroking hole. 19. The demand sensitive pressure intensifier of claim 8, wherein the second fluid pressure receiving surface comprises a piston assembly having first and second ends disposed within the housing, the first end having a seal disposed about its outer surface in sealing engagement with the housing; and the second fluid pressure receiving surface is provided with a means for restraining the motion of the piston assembly within the housing when the fluid pressure acting thereon is below the predetermined pressure value. 20. The demand sensistive pressure intensifier of claim 19, wherein the restraining means comprises a collet secured to the piston assembly and having at least two elongate collet fingers extending from the collet and releasably clamped upon a portion of the housing, whereby upon the pressure force acting upon the seal exceeding the clamping force of the collet fingers upon the portion of the housing, the piston assembly will be moved through the housing. 21. The demand sensitive pressure intensifier of claim 20, wherein the housing has an upper and a lower intensifier head; the collet fingers are releasably clamped to an alignment stop member associated with the upper intensifier head; the lower intensifier head has a hydraulic cylinder associated therewith in sealing engagement with the second end of the piston assembly; and the first hydraulic fluid passageway extends through the upper and lower intensifier heads, the alignment stop member, the collet, the piston assembly, and the hydraulic cylinder. 22. The demand sensitive pressure intensifier of claim 21, wherein the diameter of the upper end of the piston assembly is greater than the diameter of the lower end of the piston assembly, whereby the fluid pressure of the fluid compressed within the hydraulic cylinder is increased by a factor which is the ratio of the surface areas of the upper end to the lower end of the piston assembly.