| 摘要 |
The group of inventions relates to the field of drilling and well operation and, in particular, to the design of devices for penetrating producing formations by hydromechanical slot perforation. The design in question provides uniform penetration of the production string in at least two projections simultaneously and ensures that the slots formed are of the same high quality. The hydromechanical slot perforator comprises a housing, a piston or plunger disposed in said housing, and a cutting unit situated below the piston, said cutting unit comprising extendable cutting instruments with an extension mechanism in the form of a beam with the cutting instruments disposed on the arms thereof, the beam being mounted in such a way that it is able to rotate about a geometric axis as the piston or plunger moves downwards, and the cutting instruments are able to produce at least two slots simultaneously in the production string. According to the invention, the perforator is equipped with an additional piston disposed in the housing below the cutting unit such that as this lower piston moves upwards, it is able to produce an additional force on the lower beam arm bearing the lower cutting instrument, the upwards movement of the lower piston being provided by the action thereon of a fluid supplied to the lower piston under pressure, for example via one or more hydraulic channels provided in the housing of the perforator, or via a hydraulic system otherwise provided in the perforator. Embodiments of the invention are proposed with different designs of the cutting instrument extension mechanism. |
