LIGHT POLYMER BACKFILL COMPOUND FOR OIL AND GAS WELLS Russian patent published in 2006 - IPC C09K8/473 

FIELD: backfill solutions used during cementing of casing strings of gas, gas-condensate and oil wells, abnormal due to presence of weakly connected permafrost rocks prone to hydro-disruption.

SUBSTANCE: light polymer backfill compound for oil and gas wells includes backfill Portland cement, aluminosilicate hollow micro-spheres, polymer binding agent, hardening agent, expanding admixture. As polymer binding agent compound contains specified brand of epoxide resin and specified brand of epoxide-urethane rubber, and as hardening agent compound contains polyethylene-polyamine and oligomer amide-amine of specified brand, as expanding admixture - polyvinylchloride and dioctylphthalate plasticizer, with following ratio of components in shares of mass: resin - 31,3-42,9, dioctylphthalate - 3,6-7,5, epoxide-urethane rubber - 3,2-6,4, backfill Portland cement 13,6-24,3, aluminosilicate hollow micro-spheres - 0,6-3,8, polyvinylchloride - 13,6-22,9, polyethylene-polyamine - 1,6-2,7, oligomer amide-amine - 7,2-18,7.

EFFECT: increased strength and adhesion properties of backfill stone, decreased heat conductivity coefficient with minimal density of backfill solution equal to 1100 kg/m³ and expansion ratio equal to 0,1%.

3 tbl, 1 dwg