| 摘要 |
The invention relates to drilling and operation activity of oil, gas and injection wells, in particular, to a device for making longitudinal perforation slits in casing (operation) strings, cement stone and rock formation. The inventive result is aimed at making multi-slit perforation, including simultaneously in different radial directions with reducing efforts at perforator movement due to the absence of contact between its body with a string, and also providing workability thereof in operation and maintenance, in centering the perforator in a pipe, and also providing reliability and simplicity of its design. The perforator comprises a body 1, a puller piston 2, deflecting wedge 3 and an extending cutting tool embodied as a cutting disk 5 mounted on an axis 4 and an extending mechanism adapted to interact with the deflecting wedge 3. A module is arranged under the puller piston 2 in the perforator body, the module is embodied of at least two serially disposed working cylinders 6, a through longitudinal cut 7 is made in a wall of each cylinder. A return unit 8 embodied as a return spring is mounted under the module, wherein a thrust piston 9 is arranged between the return unit 8 and the lower working cylinder 6. Depending upon the required direction, the working cylinders 6 are preferably be arranged in the module, so that through longitudinal cuts 7 are to be oriented by a transverse angular displacement relative each other. The module is adapted to longitudinal displacement by the puller piston 2 in one direction, and in opposite direction by the return unit 8. An extending cutting tool is mounted inside each of working cylinders 6, the mechanism is extended via the through longitudinal cut 7. In the inventive perforator the extending mechanism is embodied as a single arm lever mounted on an axis , e.g. as two plates. An axis of a cutting disk 5 is arranged in the lever arm 11. The extending mechanism is adapted to cooperate with the deflecting wedge 3, a number of the deflecting wedges 3 corresponds to a number of working cylinders 6 in the module, installing one deflecting wedge 3 in the zone of interaction with the extending mechanism from each working cylinder 6. At least one hydro canal equipped with a hydraulic monitor head is provided in the puller piston. |
