HETEROGENEOUS PROPPANT PLACEMENT IN FRACTURE WITH REMOVABLE EXTRAMETRICAL MATERIAL FILL Russian patent published in 2016 - IPC E21B43/267 C09K8/62 

FIELD: mining.

SUBSTANCE: group of inventions relates to mining and can be used for heterogeneous arrangement of proppant in hydraulic fracturing. Method comprises injecting a first treatment fluid comprising a gas and substantially free of macroscopic particles through a wellbore at a pressure sufficient to initiate a fracture in a subterranean formation; injecting a second treatment fluid comprising proppant and an extrametrical material through wellbore and into fracture, wherein introducing is achieved with varied and pulsed proppant concentrations in a pumping schedule, and forming a plurality of proppant clusters comprising proppant and extrametrical material in fracture. Method includes optimising duration of pumping pulse and concentration of proppant in pumping schedule for increasing conductivity of hydraulic fracturing, wherein extrametrical material is subjected to degradation in subterranean formation. Duration between proppant pumping pulses is less than 60 seconds.

EFFECT: high efficiency of heterogeneous placement of proppant.

27 cl, 9 dwg