DELIVERY OF GRANULAR MATERIAL UNDER GROUND Russian patent published in 2015 - IPC E21B43/267 C09K8/80 C09K8/94 

FIELD: mining.

SUBSTANCE: group of inventions relates to mining and can be used for formation hydraulic fracturing. The wellbore fluid comprises the water-based liquid-carrier, hydrophobic fibres suspended in it, the hydrophobic granular material also suspended in the liquid-carrier, and the gas for moistening the surface of the particles and binding them together in agglomerates. The wellbore fluid may be the fluid for formation hydraulic fracturing, which is a water-based reagent for reducing the surface tension, and can be used for fracturing the tight gas-bearing formation. Use of the combination of a hydrophobic particulate material, hydrophobic fibres and gas retards precipitation of the granular material from the water-based liquid-carrier. Since gas wets the surfaces of the both materials and agglomerates them, the particulate material is forced to adhere to the fibres; the fibres form a three-dimensional network that prevents precipitation of the particulate material adhered to it, and the agglomerates contain gas and thus a bulk density is obtained, which is less than the specific weight of the solids contained in the agglomerates.

EFFECT: increasing the efficiency of delivery of granular material under the ground.

18 cl, 5 dwg, 12 ex