The effectiveness of expansive cement systems may be diluted when, during a well cementing operation, commingling takes place between the cement slurry and a spacer fluid, a drilling fluid, or both. Incorporating expansive agents in the spacer fluid or drilling fluid may reduce or negate the loss of expansion at the cement slurry/spacer interface or the cement slurry/drilling fluid interface, thereby promoting zonal isolation throughout the cemented interval.

The effectiveness of expansive cement systems may be diluted when, during a well cementing operation, commingling takes place between the cement slurry and a spacer fluid, a drilling fluid, or both. Incorporating expansive agents in the spacer fluid or drilling fluid may reduce or negate the loss of expansion at the cement slurry/spacer interface or the cement slurry/drilling fluid interface, thereby promoting zonal isolation throughout the cemented interval.

Methods and compositions are provided that relate to cementing operations. Methods and compositions that include pumice in geopolymer cement compositions comprising slag.

Methods and compositions are provided that relate to cementing operations. Methods and compositions that include pumice in geopolymer cement compositions comprising slag.

The present invention provides a composition for forming a lightweight, low shrinkage and hydrophobic cementitious matrix, and a method for preparing thereof. The present cementitious matrix formed by the composition is lightweight, hydrophobic (or water repelling) and with low shrinkage which is useful in building and construction industry as non-structural wall resistant to water, heat and sound entry. The present invention also provides a method of preparing the composition and the cementitious matrix formed from the composition.

The present invention provides a composition for forming a lightweight, low shrinkage and hydrophobic cementitious matrix, and a method for preparing thereof. The present cementitious matrix formed by the composition is lightweight, hydrophobic (or water repelling) and with low shrinkage which is useful in building and construction industry as non-structural wall resistant to water, heat and sound entry. The present invention also provides a method of preparing the composition and the cementitious matrix formed from the composition.

Vinyl acetate-ethylene and/or styrene-(meth)acrylic ester copolymers along with processes for preparing the same and uses for the same. Wherein the vinyl acetate-ethylene and/or styrene-(meth)acrylic ester copolymers are in the form of water-redispersible powders for producing hydraulically-setting building material dry formulations. Where the storage stability of the protective-colloid-stabilized vinyl acetate-ethylene or styrene-(meth)acrylic ester copolymers in the form of water-redispersible powders is improved by drying aqueous dispersions comprising protective-colloid-stabilized vinyl acetate-ethylene and/or styrene-(meth)acrylic ester copolymers, one or more water-soluble inorganic salts, and one or more desiccants. Where the water-soluble inorganic salts are selected from the group consisting of alkali metal sulfates and where the desiccants are selected from the group comprising polyvinyl alcohols, polyvinyl acetals, nonionic polyvinylpyrrolidones, nonionic poly(meth)acrylamides, polysaccharides and proteins.

Vinyl acetate-ethylene and/or styrene-(meth)acrylic ester copolymers along with processes for preparing the same and uses for the same. Wherein the vinyl acetate-ethylene and/or styrene-(meth)acrylic ester copolymers are in the form of water-redispersible powders for producing hydraulically-setting building material dry formulations. Where the storage stability of the protective-colloid-stabilized vinyl acetate-ethylene or styrene-(meth)acrylic ester copolymers in the form of water-redispersible powders is improved by drying aqueous dispersions comprising protective-colloid-stabilized vinyl acetate-ethylene and/or styrene-(meth)acrylic ester copolymers, one or more water-soluble inorganic salts, and one or more desiccants. Where the water-soluble inorganic salts are selected from the group consisting of alkali metal sulfates and where the desiccants are selected from the group comprising polyvinyl alcohols, polyvinyl acetals, nonionic polyvinylpyrrolidones, nonionic poly(meth)acrylamides, polysaccharides and proteins.

The present invention relates to a two-component composition consisting of a component A intended to be mixed, in situ, with a component B in order to form an injectable or pumpable organo-mineral compound, in particular for injection-sealing dynamic anchor bolts, comprising at least one alkali metal silicate, at least one polyisocyanate derivative and at least one cement. The component A further contains at least one polyol having a molecular mass of between 50 and 200 g/mol, at least one polymerisation catalyst comprising at least one polar function and at least one gelling agent and the component B further comprises at least one suitable

The present invention relates to a two-component composition consisting of a component A intended to be mixed, in situ, with a component B in order to form an injectable or pumpable organo-mineral compound, in particular for injection-sealing dynamic anchor bolts, comprising at least one alkali metal silicate, at least one polyisocyanate derivative and at least one cement. The component A further contains at least one polyol having a molecular mass of between 50 and 200 g/mol, at least one polymerisation catalyst comprising at least one polar function and at least one gelling agent and the component B further comprises at least one suitable