FIELD: manufacture of granulated materials used as wedging filler and gravel filter for control of sand flow.
SUBSTANCE: proposed granulated material has particles coated with two or more layers of hardenable coat; coated particles include granulated substrate and at least one layer of first curable resin practically embracing the substrate and at least one layer of second curable resin practically surrounding at least one layer of first curable resin; amount of curing agent in layer of first curable resin and in layer of second curable resin is lesser than that at which resin is practically cured.
EFFECT: increased compressive strength; increased elasticity; high strength at curing; forming strong blocks of wedging filler at pumping granulated material into well.
86 cl, 1 dwg, 12 tbl
