DEVICE FOR PERFORATION OF CASED WELL (VARIANTS) Russian patent published in 2004 - IPC

FIELD: oil and gas extracting industry. SUBSTANCE: device has body fixed on tubing string, mechanism for cutting port in casing string with a cutting tool, rotation drive for the tool and with an assembly for its movement, flexible sleeve with hydraulic monitoring nozzle, deflector of flexible sleeve, mechanism for extending flexible sleeve as well as drive for extending flexible sleeve and a line for supplying working fluid from pumping device. Drive for extension of flexible sleeve is mounted on the day surface. It has drive for reciprocal displacement. Its driving element is connected to upper end of flexible sleeve by means of mechanical link. This link is made in form of a pipe with a headpiece in its lower end. Moving assembly of cutting tool is made in form of a rod. On one end of said rod an engaging device is mounted with possible interaction with headpiece of said pipe. Other end of rod is connected to rotation drive of cutting tool. Lines for supplying working fluid from pumping device for providing for rotation of cutting tool and onto hydraulic monitoring nozzle of flexible sleeve are made autonomous. In other variant of construction, mechanical link between driving element of the drive and upper end of flexible sleeve is made in form of a rod with a headpiece on the lower end and hollow plunger connected to it, which is connected to upper end of flexible sleeve, also a cylindrical hollow for water-proof placement of hollow plunger of mechanical link is made on the body of device and connected to deflector of hollow sleeve. Line for supplying working fluid from pumping device to hydraulic monitoring nozzle of flexible sleeve is made in form of hollow of tubing string, which hollow is hydraulically connected to flexible sleeve through the hollow plunger. Line for supplying working fluid from pumping device for providing for rotation of cutting tool is made in form of hollow in column of tubing string, which is hydraulically connected to hydraulic drive, and equipped with check valve. EFFECT: increased reliability of device operation. 2 cl, 2 dwg