DEFLECTING FLUID Russian patent published in 2011 - IPC C09K8/80 E21B43/267 

FIELD: mining.

SUBSTANCE: deflecting fluid for temporary sealing of the upper and lower parts of a treated interval in an underground formation by means of supply of the deflecting fluid into holes defined by a drill hole, being hydraulically connected with the treated interval, besides, the deflecting fluid includes a water bearing fluid, which substantially contains water, where particles of the first deflecting agent and particles of the second deflecting agents are dispersed, where the particles of each of the first and second deflecting agents include particles of the propping agent substrate, having a water-soluble polymer coating, besides, the particles of the first deflecting agent have density, which is higher than the density of the water bearing fluid, while the particles of the second deflecting agent have the density, which is less than the density of the water bearing fluid, where the water-soluble polymers of each of the first and second deflecting agents are independently selected from the group that consists of collagen of type I, collagen of type II, collagen of type III, collagen of type IV, collagen of type V and their mixtures. The method to prepare the treated interval in the underground formation for formation fracturing to increase intensification of flow from the treated interval by means of formation fracturing, includes injection of the above specified deflecting fluid into the treated interval, which results in the fact that the particles of the first deflecting agent are deposited in the lower part of the treated interval, forming a temporary lower border, which substantially seals the lower part of the treated interval relative to the flow of liquid via this lower border, and the particles of the second deflecting agent rise in the upper part of the treated interval, forming a temporary upper border, which substantially seals the upper part of the treated interval relative to the flow of liquid through this upper border.

EFFECT: intensification of flow into one or many intervals in underground drill holes as a result of deflection of working fluids flow to process a drill hole in a certain direction.

16 cl, 2 ex, 3 dwg