DEVICE FOR RADIAL STRATUM OPENING Russian patent published in 2010 - IPC E21B43/11 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry, particularly to equipment for opening productive strata. The device for radial stratum opening contains a casing 2 with a channel 3 installed in the casing string 5 on pump and compressor pipes 1, a cutting instrument 6, a drive for rotation of the cutting instrument represented by a downhole engine 16, the cutting instrument delivery unit and an anchor unit 4. The drive shaft 20 of the downhole engine 16 is connected to the cutting instrument 6 via a cardan gear 7 with cardan joints 8 and intermediate links 9. The cutting instrument delivery unit is positioned in one of the cardan gear intermediate links and consists of a spring-loaded telescopic shaft 10 installed between the cardan half-couplings 13, 14 with the shaft two parts interconnected with a pin 11 inserted into the grooves 12, and providing for the preset course of their mutual axial travel and by compressive force of the spring 15 providing for opening of the casing string 5. In the housing 2 a mounting seat 17 is arranged with radial grooves 19 slanted at the entry to the channel 3. The downhole engine 16 is equipped with a turning pivot 21 in its upper part that has a hermetically sealed axial channel 22 and providing for connection to the coil tubing pipe 23 having slanted radial projections 18, in its lower part designed so that to enable matching the radial grooves 19 of the housing 2.

EFFECT: improved efficiency and reliability of the device operation.

2 dwg