SIDETRACK KICKOFF TOOL Russian patent published in 2014 - IPC E21B7/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to construction of oil and gas wells, in particular to devices intended for sidetracking. The tool includes cutters - window cutter with a tip and expanding cutter having a common case with the central channel having stepped and arched surfaces, a whipstock fixed to the lower end of the window cutter, equipped with a shear lug made as a longitudinal corrugated pipe with a blind lower end and arms made as abrasive elements at external surface, and a hydraulic circuit. The tip body is made solid with a flushing port and an eccentric outlet opening interconnected to a flushing port made as a grove at the tip working area. The cutter blades are made as separate steel straps with flat-topped longitudinal grooves with cutting elements. At the lug external surface, along the perimeter there is a sealant applied with thickness up to 5mm in the form of straps placed at the distance equal to width of the strap width at least. The lug slips are made similar to the cutter blades and installed diametrically opposed to each other in the area of arched surface transfer of the corrugation towards cavities in longitudinal direction by intervals.

EFFECT: reduced emergency rate, improved reliability of the whipstock setting and the well bore separation.

5 dwg