DOUBLE-ENDED HYDROMECHANICAL SLOT PERFORATOR Russian patent published in 2008 - IPC E21B43/112 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the drilling and production activity of the oil, gas and injection wells. The device contains a body where the puller piston and the telescopic cutting instrument made as upper and lower cutting disks which enable cutting two diametrical slots in column, are installed. Each disk is installed on its axis. The telescopic mechanism is made as the balance arm assembled on the central axis. The balance arm is made so as to enable rotating at relocation of puller piston. In the balance arm, at the different distance from the central axis, the axes of the cutting disks are installed. The length of the balance arm to the upper disk axis is less than that to the lower disk axis. The device enables the firm development of the flow string simultaneously with two disks, and increased durability of the cutting disks.

EFFECT: development of the flow string simultaneously with two disks, and increased durability of the cutting disks are provided.

4 dwg