PROPPANT Russian patent published in 2013 - IPC C09K8/80 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to production of proppants used during oil and gas extraction using the formation hydraulic fracturing method. Proppant used during oil and gas extraction applying the formation hydraulic fracturing method is obtained in the form of granules with pycnometric density of 1.2-3.0 g/cm³ and sizes of 0.2-4.0 mm from powder-like material and a binding agent, which differs by the fact that the binding agent is the mixture containing 70.0-99.5 wt % of organic binding agent and 0.5-30.0 wt % of chlorhydric acid (36%) and/or hydrofluoric acid (40%), and/or sulphuric acid (92.5%). Invention is developed in dependent claims.

EFFECT: higher strength.

7 cl, 43 ex, 1 tbl