Abstract: Aimed at the problem of cementing quality, cement-mantle corrosion and brittle fracture in the mid-term and later stage of oilfield development, the improvement of corrosive resistance and toughness of cement stone by using emulsion are investigated by means of chemical analysis and compressive resistance and bending strength test on cement samples. The results demonstrate that the emulsion cement stone can obviously be improved than the anticorrosive ability of ordinary cement stone. With the increase of the emulsion content in the cement stone, the fragility coefficient of the cement stone decreases gradually, compressive resistance increases and the tensile toughness of the cement stone is strengthened when m(emulsion)/m(slurry) is 1/1.5∶10, the cement stone is tightest and the permeability is lowest.

Key words: styrene-butadiene emulsion, cement slurry, toughness, corrosive resistance, tensile strength