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A check enhancer for use in a well comprises an outer housing portion and an inner injector portion disposed in the housing portion. The housing portion includes an outer body defining a fluid cavity therein with a plurality of body ports in communication with the fluid cavity and an adapter which s

A check enhancer for use in a well comprises an outer housing portion and an inner injector portion disposed in the housing portion. The housing portion includes an outer body defining a fluid cavity therein with a plurality of body ports in communication with the fluid cavity and an adapter which slidably receives a portion of a length of tubing therethrough. A tubing fitting connects the tubing to the adapter. The injector portion includes a check valve and a dispersement nipple attached thereto. The check valve is connected to the tubing in the fluid cavity by another tubing fitting, and the check valve allows fluid flow from the tubing through nipple ports defined in the dispersement nipple. The nipple ports are longitudinally spaced from the body ports so that the fluid cavity remains substantially filled with fluid with the dispersement nipple substantially submerged within the fluid.

대표청구항 ▼

A check enhancer for use in a well comprises an outer housing portion and an inner injector portion disposed in the housing portion. The housing portion includes an outer body defining a fluid cavity therein with a plurality of body ports in communication with the fluid cavity and an adapter which s

A check enhancer for use in a well comprises an outer housing portion and an inner injector portion disposed in the housing portion. The housing portion includes an outer body defining a fluid cavity therein with a plurality of body ports in communication with the fluid cavity and an adapter which slidably receives a portion of a length of tubing therethrough. A tubing fitting connects the tubing to the adapter. The injector portion includes a check valve and a dispersement nipple attached thereto. The check valve is connected to the tubing in the fluid cavity by another tubing fitting, and the check valve allows fluid flow from the tubing through nipple ports defined in the dispersement nipple. The nipple ports are longitudinally spaced from the body ports so that the fluid cavity remains substantially filled with fluid with the dispersement nipple substantially submerged within the fluid. e of the reverse direction of the plate which is rotatably held by the side grooves. 4. The shutter according to claim 1, wherein the side groove is formed so that the height of the groove side wall located on the side of the reverse direction of the plate is greater than the height of the groove side wall located on the side of the normal direction of the plate. 5. The shutter according to claim 1, further comprising roller members connected to the opposite ends of the hinge members and mounted in the guide grooves, wherein the roller members rotate in the guide grooves along the sliding direction of the shutter panel, and opposite end edges of the plate on the transverse side hereof having extension pieces which have substantially the same length as the projecting length of the roller member from the end of the hinge member, and accommodated between adjacent roller members. 6. The shutter according to claim 1, wherein the hinge member holds the long side of the plate so that the plate can slide in its longitudinal direction and the plate is prevented from being disconnected from the hinge member when the plate is pulled in its transverse direction, and pull-out preventing members mounted to the opposite ends of the hinge member for preventing the plate from being slidably disconnected from the hinge member when the plate is pulled in is longitudinal direction. 7. A shutter comprising: a shutter panel having a plurality of plates rotatably connected to one another by hinge members; and a pair of guide rails formed with guide grooves for slidably holding opposite end edges of the shutter panel; wherein each of the hinge members connects the adjacent plates so that the plates can be rotatably bent only in a direction in which the curvature becomes greater than a minimum curvature portion of the guide groove; and wherein the hinge member is a columnar body connecting long sides of the adjacent plates, a pair of side grooves for holding the plate so that the plate is rotatable and is prevented from being pulled out are formed on side walls of the hinge member, and each of the side grooves is formed with reverse movement-preventing means for abutting against the plate to prevent the plate from rotating in a direction opposite from a direction in which the curvature of the guide groove becomes great when the adjacent plates are arranged straightly through the hinge members, and normal movement-preventing means for abutting against the plate to prevent the plate from rotating in the normal direction when the plate is rotated in the normal direction in which the curvature becomes great through a predetermined angle; and further wherein one of the opened end edges of the side groove is formed with a projecting portion along a longitudinal direction thereof, the end edge of the plate is formed, along a longitudinal direction thereof, with a protruding portion which engages with the projecting portion so that the plate is rotatable, the reverse movement-preventing means is the other opened end edge of the side groove which abuts against the other surface of the plate, and the normal movement-preventing means is one of the opposed inner walls of the side groove which is formed to abut against and support the end edge of the plate when the plate is rotated in the normal direction through a predetermined angle. 8. The shutter according to claim 7, wherein the other one of the opposed inner walls of the side groove is formed to abut against and support the end edge of the plate when the adjacent plates are arranged straightly through the hinge members. 9. The shutter according to claim 7, wherein the hinge member is a columnar body having a rectangular section which is longer in a widthwise direction of the guide groove slidably holding the shutter panel, and the pair of side grooves are formed on the side of the reverse direction of the plate which is rotatably held by the side grooves. 10.