The present disclosure to a cementitious plugging wall solidifier for water-based drilling fluid and a preparation method thereof and a water-based drilling fluid.

The present disclosure to a cementitious plugging wall solidifier for water-based drilling fluid and a preparation method thereof and a water-based drilling fluid.

An inorganic fiber molded body includes an alumina fiber, an inorganic porous filler, and a colloidal silica, in which a ratio of crystalline minerals in the alumina fiber is 30% by mass or more and 80% by mass or less, the inorganic porous filler contains CaO.Math.6Al.sub.2O.sub.3 in which a particle diameter D95, which has a cumulative value of 95% in a volume frequency particle size distribution, is 300 μm or less, and in 100% by mass of the inorganic fiber molded body, a content of the alumina fiber is 15% by mass or more and 70% by mass or less, a content of the inorganic porous filler is 20% by mass or more and 79% by mass or less, and a content of the colloidal silica is 2% by mass or more and 8% by mass or less.

An inorganic fiber molded body includes an alumina fiber, an inorganic porous filler, and a colloidal silica, in which a ratio of crystalline minerals in the alumina fiber is 30% by mass or more and 80% by mass or less, the inorganic porous filler contains CaO.Math.6Al.sub.2O.sub.3 in which a particle diameter D95, which has a cumulative value of 95% in a volume frequency particle size distribution, is 300 μm or less, and in 100% by mass of the inorganic fiber molded body, a content of the alumina fiber is 15% by mass or more and 70% by mass or less, a content of the inorganic porous filler is 20% by mass or more and 79% by mass or less, and a content of the colloidal silica is 2% by mass or more and 8% by mass or less.

A method of making a chemical-resistant concrete composition, namely a quartz-based casting composition, is provided. The quartz-based casting composition provides excellent resistance to attack by chemicals, including weak and strong acids. The quartz-based casting composition is useful as concrete in various construction applications where corrosion resistance is needed. The casting composition includes a dry component and a wet component. The dry component includes about 25% to about 100% by weight quartz and the corrosion resistance increases with increasing quartz content.

This geopolymer molding production method comprises: a mixing step (S1) for mixing a first material containing aluminum and silicon with a hydrate of an alkali stimulant containing a hydrate of an alkaline hydroxide and/or a hydrate of an alkaline silicate; a compaction step (S2) for compacting the mixture obtained in the mixing step (S1) into a compacted mixture; and a curing step (S3) for curing the compacted mixture.

This geopolymer molding production method comprises: a mixing step (S1) for mixing a first material containing aluminum and silicon with a hydrate of an alkali stimulant containing a hydrate of an alkaline hydroxide and/or a hydrate of an alkaline silicate; a compaction step (S2) for compacting the mixture obtained in the mixing step (S1) into a compacted mixture; and a curing step (S3) for curing the compacted mixture.

Cementing compositions containing a hydraulic cement, halloysite nanoparticles, and silica flour. The cementing compositions may optionally include other additives such as a friction reducer, a defoamer, and a fluid loss additive. Cement samples made therefrom and methods of producing such cement samples are also specified. The addition of halloysite nanoparticles and silica flour provides enhanced mechanical strength (e.g. compressive strength, flexural strength) and improved durability (e.g. resistance to CO.sub.2 and salinity) to the cement, making them suitable cementing material for oil and gas wells.

What are described are the use of a refractory coating composition for production of cores for diecasting, a kit for production of cores for use in diecasting, a method of producing cores for use in diecasting, cores for use in diecasting, and the use of such cores in diecasting, especially of lightweight metals

What are described are the use of a refractory coating composition for production of cores for diecasting, a kit for production of cores for use in diecasting, a method of producing cores for use in diecasting, cores for use in diecasting, and the use of such cores in diecasting, especially of lightweight metals