The present invention relates to the field of oil and natural gas well cementation engineering, in particular to a foam stabilizer composition, foamed cement slurry and an additive composition thereof. The foam stabilizer composition comprises C6-C20 alkyl amido alkyl amine oxide, C6-C20 alkyl amido alkyl betaine, and triterpenoid saponin compound. The foam stabilizer composition provided in the present invention is helpful for forming foamed cement slurry that has high foam stability, and the foam stabilizer composition can work with other active components in the foamed slurry additive composition provided in the present invention to enable the foamed cement slurry that contains the additive composition to obtain low density, high foam stability, low permeability, and high compressive strength, which is especially applicable to well cementing operation in an oil and natural gas exploration and development process.

A treatment fluid for treating a portion of a water- sensitive subterranean formation comprising: a base fluid; and a stabilizing compound, wherein the stabilizing compound reduces or eliminates swelling of a water-swellable mineral of the portion of the water-sensitive subterranean formation, and wherein the stabilizing compound comprises: (A) a cationic functional group; and (B) a hydrophobic portion. A method of treating a portion of a water-sensitive subterranean formation comprising: introducing a treatment fluid into a wellbore, wherein the wellbore penetrates the subterranean formation, wherein the portion of the subterranean formation comprises a water-swellable mineral.

An asphalt modifier includes bitumen, polyolefin particles, and one or more alkyl terephthalamides. Preparing an asphalt modifier includes combining one or more alkyl terephthalamides, polyolefin particles, and bitumen, and dispersing the polyolefin particles in the bitumen to yield the asphalt modifier. Digesting polyethylene terephthalate includes combining polyethylene terephthalate with an alkylamine or carboxyalkylamine to yield a reaction mixture, and heating the reaction mixture to a temperature between about 20 C. and about 300 C. to yield an alkyl terephthalamide.

Rheology modifying agent that provides a rheology modifying effect over a wide temperature region. The rheology modifying agent contains amine oxide compounds represented by reference formulae (1a) and reference formulae (1b). Slurry. Method for producing a slurry.

Rheology modifying agent that provides a rheology modifying effect over a wide temperature region. The rheology modifying agent contains amine oxide compounds represented by reference formulae (1a) and reference formulae (1b). Slurry. Method for producing a slurry.

A shotcrete composition comprising a) a cementitious binder; b) an ettringite formation controller comprising (i) a glyoxylic acid condensate and/or a glyoxylic acid adduct; and c) an alkali-free, aluminum-based shotcrete accelerator. The invention further relates to a process comprising providing a cementitious composition comprising a) a cementitious binder, and b) an ettringite formation controller comprising (i) a glyoxylic acid condensate and/or a glyoxylic acid adduct; admixing an alkali-free, aluminum-based shotcrete accelerator to the cementitious composition to obtain a shotcrete composition; and applying the shotcrete composition onto a surface to obtain a shotcrete structure and allowing the shotcrete structure to harden. The invention also relates to a hardened shotcrete structure obtained by this process.