METHOD OF REPAIR AND INSULATION WORKS IN WELL Russian patent published in 2017 - IPC E21B33/138 C09K8/46 

FIELD: petroleum industry.

SUBSTANCE: method of repair and insulation works in a well includes the pumping and the squeezing by the commercial oil in isolated interval of cementing slurry based on microcement in diesel fuel via oil-well pipelines (OWP). Drillable packer on a tubing string is descended into the well; the jamming of packer is performed; high viscosity hydrophobic emulsion (HVHE) with the density higher than the density of fluid in the well is preliminarily pumped into a space between the tubing string and the walls of the well. The cementing slurry additionally contains the surface-active agent (SAA) based on the monounsaturated fatty acids and SAA based on the isomers of nonyphenol ethoxylates; the oil-well portland cement containing 95% of particles with the size of 15 µm is used as the microcement at the following ratio of components, mass h.: microcement 100; diesel fuel 60-85; SAA based on the monounsaturated fatty acids 0.13-0.36; SAA based on the isomers of nonyphenol ethoxylates 0.42-0.88.

EFFECT: improvement of safety and efficiency of repair and insulation works in a well by means of increasing of plugging capability of the cementing slurry used within the method.

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