METHOD FOR ISOLATION OF BEDS WITH MANIFESTATIONS OF HIGH-MINERALIZATION POLYMINERAL WATERS Russian patent published in 2019 - IPC E21B33/138 C09K8/46 C09K8/504 

FIELD: mining.

SUBSTANCE: invention relates to construction of wells, in particular to works on insulation of pressure beds, characterized by manifestations of polymineral waters of high degree of mineralization. Method involves preparation of insulating composition based on formation water of high degree of mineralization, into which when heated to 80 °C is additionally added with calcium or magnesium chlorides to maximum saturation of formation water at said temperature, MK-85 condensed microcrystalline in amount of 6–10 wt%, volume of supersaturated brine, chrysotile grade 4–20 in amount of 1.5–2 % by weight, to volume of supersaturated brine. Buffer liquid is successively pumped under pressure into water-saturated formation with abnormally high formation pressure, said liquid being represented by heated up to 80 °C formation water, and insulating composition. Performing process conditioning to obtain plugging residue in maximum volume. Thereafter, final composition is forced into formation with limited excessive pressure for compacting sedimentation products in formation fractures and formation of impermeable reinforced blocking screen in penetration zone of composition.

EFFECT: improving insulation reliability of fractured pressure formations with abnormally high pressures and moderate temperatures characterized by manifestations of high-mineralization polymineral waters.

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