FIELD: oil and gas industry.
SUBSTANCE: group of inventions relates to mining industry and can be used at drilling and completing of wells. An insulating device for a formation fracturing plug includes a ball seat equipped with a mounting surface and a ball having a possibility of contacting to the mounting surface. The mounting surface profile is dome-shaped; the first portion of the profile has a curvature radius that corresponds to the curvature radius of the ball profile, and the second portion has a curvature radius that is larger than that of the first portion. Besides, the invention describes a fracturing plug and an insulation method of zones of a productive formation using an insulating device.
EFFECT: improvement of tightness of an insulating device.
11 cl, 49 dwg
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