SU612004A1 - Device for fitting metal plug inside pipe - Google Patents

Claims (2)

The device for installation of metal plaster inside the pipe works as follows. The device with the corrugated pipe 10 is lowered into the well so that the middle of the corrugated pipe coincides with the middle of the defect in the pipe string. Then, the pump co-operates the working pressure in the cylinder 5. At the working pressure, the cylinder is rewound in the direction of the corrugated pipe, the rigid cone 6 and the collet head 7 compressed by the sleeve 8 are pushed in front of them. At the same time, the cylindrical holder 8 and the pin 12 approach each other; the distance between them in the initial position is equal to the distance from the end of the corrugated pipe 10 to the maximum diameter of the collet head 7. As soon as the collet head enters the corrugated pipe to its largest diameter, the pin 12 comes into contact with the cylindrical ferrule 8 and removes it from the elastic end collet head. Collet head elastically; expands, straightens the corrugated nozzle to a circular cross section, pressing it against the inner surface of the pipe being repaired. Upon further movement of the rigid cone and the chuck head inside the corrugated pipe, the latter is straightened 1 evenly and evenly over its entire length is pressed against the pipe being repaired. At the same time, the axial load on the device is mainly determined by the stiffness of the corrugated pipe And remains approximately constant. By reducing the axial loads on the device, the reliability of its operation is increased and it can be successfully used for installing patches in wells of greater depth and in pipes of smaller diameter, which significantly expands the field of application of devices for this purpose and will provide high technical and economic effect. The invention The apparatus for installing a metal plaster inside a pipe, comprising a rod connected to a sub and a piston concentrically placed in the cylinder, a spacer sleeve on which the expansion cone, collet head and sleeve are mounted, with the aim of increase the reliability of the device by reducing axial loads, the spacer sleeve is made with a longitudinal slot, and the stem with a protrusion placed in the slot of the sleeve. Sources of information taken into account in the examination: 1.Sidorov I.A. Restoration of casing tightness in oil and gas wells. Seri Drilling, VNIIOENG, M., 1972, p. 56. 2. US patent number 3179169, cl. 166-14, 1965. ten