FIELD: oil-and-gas industry.
SUBSTANCE: initial furnace charge containing quartz feldspathic sand and/or quartzite and the material - magnesium oxide source, is dried and grinded. Before grinding diatomite is added at the amount of 0.2-10.0 wt % at the content in MgO furnace charge of 9.1-10.9 wt % in terms of the calcinated substance.
EFFECT: decrease of collapsibility of proppant granules at preservation of low density of material.
1 tbl
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