METHOD OF EXPOSING PRODUCTIVE BEDS AND DEVICE TO THIS END Russian patent published in 2012 - IPC E21B43/11 E21B29/06 

FIELD: oil and gas production.

SUBSTANCE: proposed method consists in lowering perforator to preset depth, fitting it against casing tube wall by locking mechanism and its gaged displacement along well axis, further upward displacement with stable proportioned feed and slot cutting in casing tube wall by extending disc mill, and further cutting of slot in productive bed by cutting tool arranged level with said mill. In lowering said perforator, it is turned about lengthwise axis unless disc mill is leveled with well apsidal surface. Proposed device comprises saw with lever carrying endless chain with cutting elements and engaged with the case to turn it from lengthwise position into crosswise position in well, chain drive and extending disc mill arranged in the case level with cutting device, locking and gage displacement mechanism with wheel-type driver to rest on casing tube inner surface in perforation zone and elastic damper thrusts. Aforesaid mill is arranged to rotate and displace toward casing tube.

EFFECT: higher reliability and validity.

4 cl, 5 dwg