Use of scleroglucan as high temperature additive for well cements

摘要

Process for cementing oil wells, gas wells or geothermal wells, according to which a suitable drilling fluid is injected under appropriate conditions, optionally followed by a buffer fluid and, finally, a composition comprising water, a cement, at least one viscosifying additive, optionally at least one retardant compound and optionally at least one silica, characterised in that the said additive is a scleroglucan solution. …The invention applies especially to the cementation of wells at high temperature. ……