FIELD: mining.
SUBSTANCE: invention is designed for oil, gas and water insulation of wells. Method of productive formation insulation during cementation of a casing pipe involves downtake of a casing pipe equipped with reverse valves at the pipe bottom into a well, subsequent inflating of cement grout with a by-pass plug, working substance of density equal to the cement grout, with a by-pass plug, followed by displacement fluid until the reverse valves are blocked by the by-pass plug inserted over the working substance. The working substance is a cement grout with hollows filled with water or oil and sand mixture solidified by freezing. After the solidification is complete the cement grout is matured until the mentioned water or oil and sand mixture melts under the external influence, and then the formation is penetrated and depression cleaning is implemented.
EFFECT: improved reliability and efficiency of insulation method, including insulation in wells in high-intake producing formations.
3 dwg
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