Disclosed herein are a fly ash-based foam geopolymer, a preparation method therefor, and the use thereof. The fly ash-based foam geopolymer is prepared from raw materials comprising the following components in parts by weight: 900-1000 parts of a fly ash-based material; 600-700 parts of a composite alkali solution; 0-10 parts of a thickening agent; 2-6 parts of a foam stabilizer A; 5-10 parts of a water reducer; and 20-40 parts of a foaming agent. The preparation method of the present application is simple, and processes such as ball milling, water washing and calcining do not need to be carried out on the raw materials, such that the investment in a grinding equipment, a water washing equipment, a sewage treatment equipment, and a calcining equipment is reduced, and the energy consumption and carbon emissions are reduced. The fly ash-based foam geopolymer prepared by using the fly ash-based material as the main raw material in the present application has a low apparent density and a high early strength, and can be used in the field of fabricated buildings.

An apparatus for preparing foam for incorporation into cementitious slurry comprises a conduit having an inlet for receiving a gas feed and a surfactant feed, and an outlet for allowing the exit of foam. The conduit houses a porous plug that provides a partial barrier to fluid flow along the conduit, the plug comprising a plurality of particles that are packed in a regular array and that define a three-dimensional network of pores extending therebetween. The apparatus comprises a resilient component located between the plug and the conduit.

A cement composition including an aqueous fluid, inorganic cement, a foaming agent, a gas generating agent, and a stabilizer composition comprising graphene oxide. The cement composition is placed in a subterranean well and allowed to set and form a set cement. The presence of the graphene oxide results in the set cement having a greatest percent deviation from a measured slurry density of less than about 1.5%.

A cement composition including an aqueous fluid, inorganic cement, a foaming agent, a gas generating agent, and a stabilizer composition comprising graphene oxide. The cement composition is placed in a subterranean well and allowed to set and form a set cement. The presence of the graphene oxide results in the set cement having a greatest percent deviation from a measured slurry density of less than about 1.5%.

Cementitious compositions comprising lime, which may be foamed or non-foamed compositions, may increase carbon dioxide uptake of the cementitious compositions. Said cementitious compositions may be used in various cementing methods including pre-casting methods, cast-in-place methods, and primary or secondary cementing operations in a wellbore. The carbon dioxide may be added to the cementitious compositions during mixing, during pre-conditioning, during curing, or any combination thereof. Further, the carbon dioxide may be delivered as a gas (e.g., a gas that includes 1 vol % to 100 vol % carbon dioxide) or as a gas-entrained admixture that includes the gas, water, and a foaming agent.

A stable aqueous foam carrier. The stable aqueous foam carrier includes (1) a stable aqueous foam comprising a foam agent and a foam stabilizer; and (2) additives comprising fibers and other additives used in hydraulic compositions, wherein the additives are uniformly dispersed in the stable aqueous form carrier, wherein the stable aqueous foam carrier does not contain any of gypsum, cement, concrete, fine pozzolanic additives, and aggregates.

A stable aqueous foam carrier. The stable aqueous foam carrier includes (1) a stable aqueous foam comprising a foam agent and a foam stabilizer; and (2) additives comprising fibers and other additives used in hydraulic compositions, wherein the additives are uniformly dispersed in the stable aqueous form carrier, wherein the stable aqueous foam carrier does not contain any of gypsum, cement, concrete, fine pozzolanic additives, and aggregates.

A method comprises obtaining or providing a treatment fluid comprising a viscosifier polymer; an aqueous carrier fluid comprising high total dissolved solids; and a polymer composition comprising at least one of polyvinyl alcohol and polylactic acid. In some embodiments, the treatment fluid has a viscosity at 140C and at a shear rate of about 0.1 s.sup.1 to about 1 s.sup.1 of about 1,500 cP to about 10,000 cP. The method includes placing the treatment fluid in a subterranean formation.

A method comprises obtaining or providing a treatment fluid comprising a viscosifier polymer; an aqueous carrier fluid comprising high total dissolved solids; and a polymer composition comprising at least one of polyvinyl alcohol and polylactic acid. In some embodiments, the treatment fluid has a viscosity at 140C and at a shear rate of about 0.1 s.sup.1 to about 1 s.sup.1 of about 1,500 cP to about 10,000 cP. The method includes placing the treatment fluid in a subterranean formation.

Various embodiments disclosed relate to compatibilized resin-cement composite compositions and methods of using the same. In various embodiments, the present invention provides a method of treating a subterranean formation that includes placing in the subterranean formation a resin-cement composite composition. The resin-cement composite composition includes a resin, a cement, and a substituted or unsubstituted poly(alkylamine) compatibilizer.