GROUTING MORTAR OF SELECTIVE ACTION Russian patent published in 2013 - IPC C09K8/467 

FIELD: chemistry.

SUBSTANCE: invention relates to oil and gas industry, in particular to methods of selective isolation of water influxes in gas and oil wells, sealing of hole clearance, elimination of inter-strata inter-flows in wells with closely located gas-oil-water contact, including conditions of low-permeability reservoirs. Grouting mortar of selective action contains, wt %: fine-ground cement Microdur 33.83-36.96, hydrocarbon carrier - Diesel fuel 57.51- 62.84, de-emulsifier-separol 0.20-2.35, hardening activator aluminium sulphate or iron sulphate, or potassium carbonate 0-8.22.

EFFECT: extension of application field and increase of reliability and efficiency of grouting due to improvement of technological possibilities of grouting mortar and increased filtering capability into low-permeability reservoirs, micro-clearances and microcracks.

2 cl, 2 tbl