INHOMOGENEOUS DISTRIBUTION OF PROPPANT Russian patent published in 2015 - IPC E21B43/267 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is referred to intensification of hydrocarbons production from formation by hydraulic fracturing. The method of proppant induced aggregation in hydraulic fracture crack includes makeup of the proppant carrier fluid, which viscosity is increased by usage of polymer gel capable of syneresis; injection of the proppant suspension and the above fluid to the well; initiation of gel syneresis with formation of proppant aggregations. According to the second version the method includes initiation of polyelectrolyte complex formation with proppant aggregations. According to the third version the method includes makeup of the proppant carrier fluid containing polymer at temperature less than its critical solution temperature; injection of the proppant suspension and the above fluid to the underground formation at temperature more than the lowest limit of polymer critical solution temperature with formation of proppant aggregations.

EFFECT: inhomogeneous distribution of proppant in hydraulic fracture cracks, which increases conductivity and productivity of the well.

31 cl, 2 tbl, 12 ex, 5 dwg