HYDROCARBON PRODUCTION INTENSIFICATION METHOD BY LIMITATION OF SAND PRODUCTION IN OIL AND GAS WELLS Russian patent published in 2015 - IPC E21B43/22 E21B33/138 

FIELD: oil and gas industry.

SUBSTANCE: in hydrocarbon production intensification method by limitation of sand production in oil and gas wells that includes injecting solution of urethane pre-polymer in polar organic solvent and water-bearing liquid to the well, two fluid systems are prepared preliminary, wherein the first fluid system is a urethane pre-polymer in polar organic solvent with concentration of 10-20 wt % and the second fluid system is water solution in polar organic solvent or water emulsion in non-polar organic solution with concentration of 2-20 wt %, which are injected in sequence or mixed directly before injection or at injection to the well with ratio of the first system to the second system within the interval of 10:1-1:1, then it is flushed to the formation by a bank of non-polar organic solvent up to the perforation zone, withhold in static conditions within at least 6 hours up to gel formation is completed, thereafter fluid in the well is displaced by water and gel is kept in contact with water in the bottomhole zone of at least 24 hours at pressure not exceeding the formation pressure.

EFFECT: increasing run between repairs for the well and intensifying production of hydrocarbons.

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