FIELD: chemistry.
SUBSTANCE: invention relates to construction and repair of oil and gas wells, and specifically to light insulating backfill used primarily to eliminate zones of disastrous lost circulation of flushing fluid when drilling and repairing oil and gas wells. The light insulating backfill, which contains oil well portland cement, aluminosilicate hollow microspheres, mud powder and water, further contains polyacrylamide, ecocell and calcium chloride, and the mud powder is low-colloid bentonite mud powder, with the following ratio of components, wt %: oil well portland cement 21.45-28.07; aluminosilicate hollow microspheres 5.35-9.85; low-colloid bentonite mud powder 5.63-9.14; polyacrylamide 0.43-0.56; ecocell 1.00-2.00; calcium chloride 5.22-8.49; water - the rest.
EFFECT: resistance of the material to erosion by water at the solidification phase, high rate of gaining plastic strength and optimum setting time.
2 tbl
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