FIELD: oil and gas industry.
SUBSTANCE: oil-well light weight portlandcement contains oil-well portlandcement, a modifying agent in the form of water-soluble polymer and a light-weight filler. At that the water-soluble polymer contains an anionic polyacrylamide with molecular mass of 18-20 mln. Dalton and hydrolysis degree of 20-25%, acrylic acid copolymer with 2-acrylamido-2-methylpropane sulphonic acid, and aluminosilicate hollow microspheres or expanded perlite is used as a light-weight filler with the following ratio of components, wt %: oil-well portlandcement 70-85; aluminosilicate hollow microspheres 19.6-29.6 or expanded perlite 14.6-24.6, anionic polyacrylamide 0.1-0.2; acrylic acid copolymer with 2-acrylamido-2-methylpropane sulphonic acid 0.1-0.2.
EFFECT: reducing density of cement slurry, improving strength and adhesion.
1 tbl, 3 cl
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