A composition may be suitable for flowable refractory materials and include calcium aluminate cement, a filler, a plasticizer in the form of a copolymer comprising polyether side chains, and a retarder having at least one acid. An article may include such a composition.

A composition may be suitable for flowable refractory materials and include calcium aluminate cement, a filler, a plasticizer in the form of a copolymer comprising polyether side chains, and a retarder having at least one acid. An article may include such a composition.

Provided is a concrete hardener composition. The concrete hardener composition includes a sodium silicate compound, an acid compound and a balance amount of solvent. The sodium silicate compound includes sodium silicate or a mixture of sodium silicate and sodium methylsilicate. The acid compound includes acetic acid, glycolic acid, ethylenediaminetetraacetic acid, tartaric acid, nitric acid, boric acid or a combination thereof. The solvent includes water or a mixed solution of water and polyol. Based on the total weight of the concrete hardener composition, the content of silicon is between 5 wt % and 15 wt %, and the content of the acid compound is between 2 wt % and 30 wt %.

A method of manufacturing a composition with hierarchical nanochemical bonding includes making a powder of one or more oxygen containing materials; mixing the powder either with a water solution of organic and/or inorganic acid to form an acidic slurry, or with water to form a hydrated basic slurry; and curing the slurry to form a solid. The powder comprises nanoscale particles, or microscale particles, or a mixture of nanoscale particles and microscale particles.

A method of manufacturing a composition with hierarchical nanochemical bonding includes making a powder of one or more oxygen containing materials; mixing the powder either with a water solution of organic and/or inorganic acid to form an acidic slurry, or with water to form a hydrated basic slurry; and curing the slurry to form a solid. The powder comprises nanoscale particles, or microscale particles, or a mixture of nanoscale particles and microscale particles.

Methods, compositions, and systems for cementing are included. The method comprises providing a cement composition comprising calcium-aluminate cement, water, a cement set retarder, and a cement set activator. The method further comprises introducing the cement composition into a subterranean formation and allowing the cement composition to set in the subterranean formation. The cement composition has a thickening time of about two hours or longer.

In accordance with one or more embodiments of the present disclosure, a drilling fluid may include a base fluid, one or more formaldehyde-based resins, and one or more water-soluble acid catalysts. The base fluid may include an aqueous or non-aqueous solution. The one or more water-soluble acid catalysts may be present in an amount sufficient to reduce the pH of the drilling fluid to less than or equal to 6. The present disclosure also describes sealed subterranean petroleum formations that include such drilling fluids and methods for sealing subterranean wellbores by utilizing such drilling fluids.

In accordance with one or more embodiments of the present disclosure, a drilling fluid may include a base fluid, one or more formaldehyde-based resins, and one or more water-soluble acid catalysts. The base fluid may include an aqueous or non-aqueous solution. The one or more water-soluble acid catalysts may be present in an amount sufficient to reduce the pH of the drilling fluid to less than or equal to 6. The present disclosure also describes sealed subterranean petroleum formations that include such drilling fluids and methods for sealing subterranean wellbores by utilizing such drilling fluids.

Corrosion mitigating cement compositions and methods for their preparation are provided. The cement compositions are derived from self-cementing pozzolans and chemical accelerators, retarders, mechanical strength modifiers and corrosion inhibitors. The corrosion inhibitors include boron compounds such as boric acid. Concretes prepared using the cement compositions possess low conductivity and a conductivity which further decreases with aging.

The purpose for the invention is to develop a low-viscosity sealant that can be placed into the well fractures easily while providing long-term robust wellbore sealing. Nanoparticles like nanosilica particles are proposed and used to seal the fractures and keep the wellbore integrity. Application of nanosilica particles is beneficial as it has a low viscosity and requires low pressure to inject into fractures.