TUBE PERFORATOR (VERSIONS) Russian patent published in 2013 - IPC E21B43/11 

FIELD: oil and gas industry.

SUBSTANCE: tube perforator consists of connected hydraulically forged housings, the upper ones of which are provided with axial channels for differential pistons, and the lower one of which is provided at least with one transverse channel for a radial impact piston with a puncheon. As per Version 1, perforator is equipped through a hinged connection by means of an inertia casing packer or an anchor operated due to the increase in speed of its lowering to pipe string filled with liquid. Inertia casing packer of the perforator consists of sealing, anchoring and resistive assemblies, and anchor consists only of anchoring and resistive assemblies. Anchoring assembly is made in the form of a cone and billets with a billet holder and connected from below to the resisting assembly in the form of inverted "U" or "V" shaped element, for example rubber or cuff, which has the possibility of increasing the resistance force on the perforator at its lowering speed rise so that lifting of billets above the cone till they are borne against the tube body can be provided. As per Version 2, radial impact piston and puncheon of the perforator are made as separate components and connected to each other by means of mating threads to make it possible to replace the used puncheon, and lower hydraulically forged housing is made as a solid part and provided with an external projection either on the side of radial impact piston with a replaceable puncheon, or on the opposite side of radial impact piston with a replaceable puncheon.

EFFECT: improving reliability and operating efficiency of the tube perforator in the well.

11 cl, 5 dwg