Various embodiments disclosed relate to constitutionally dynamic polymer for treatment of subterranean formations. In various embodiments, the present invention provides a method of treating a subterranean formation, the method including placing in the subterranean formation a composition including a constitutionally dynamic polymer.

The present invention relates to a method for producing amphiphilic functionalized highly branched melamine-polyamine polymers by condensing melamine and optionally a melamine derivate having at least one different amine having at least two primary amino groups and optionally also with urea and/or at least one urea derivative and/or with at least one at least difunctional diisocyanate or polyisocyanate and/or at least one carbolic acid having at least two carboxyl groups or at least one derivative thereof, optionally quaternizing a portion of the amino groups of the polymer thereby obtained, reacting the polymer thus obtained with at least one compound capable of undergoing a condensation or addition reaction with amino groups, and optionally quaternizing at least part of the amino groups of the polymer obtained in the first step. The invention further relates to the amphiphilic functionalized highly branched melamine-polyamine polymers that can be obtained by the method according to the invention, and to the use thereof as surface active agents.

Cement slurry compositions comprising water, an inorganic cement and additive comprising nanocrystalline cellulose, microcrystalline cellulose, cellulose fibrils, or bacterial nanocellulose or combinations thereof have reduced fluid loss values. Such compositions may be prepared and placed in subterranean wells. The compositions are suitable for use during primary cementing or remedial cementing operations.

Provided are a gypsum hardened product and a method for producing the same, whereby, in bubble-containing gypsum hardened products of the same density and the same average bubble size, strength of the gypsum hardened product can be enhanced by controlling a coefficient of variation of bubble size.

A gypsum hardened product containing bubbles, wherein a density of the gypsum hardened product is 0.4 g/cm.sup.3 or more and 0.8 g/cm.sup.3 or less, and in the gypsum hardened product, an average bubble size is 200 m or more and 600 m or less, and a coefficient of variation of bubble size is 0.30 or more and 0.48 or less.

Compositions including cement and an additive and methods for making compositions and/or concrete mixtures including a cement and an additive are provided.

A cement for use in wells in which hydrogen sulfide is present, comprises polymer particles. In the event of cement-matrix failure, or bonding failure between the cement/casing interface or the cement/borehole-wall interface, the polymer particles swell when contacted by hydrogen sulfide. The swelling seals voids in the cement matrix, or along the bonding interfaces, thereby restoring zonal isolation.

A hydrocolloid particle suspension comprises a concentration of at least 0.5 g/100 g of hydrocolloid particles, and a stabilizing additive containing at least one polyoxyalkylene moiety of 3 to 150 consecutive oxyalkylene units, wherein the at least one polyoxyalkylene moiety comprises at least 25 wt.-% of oxyethylene moieties, based on the total oxyalkylene moieties comprised in the stabilizing additive. The suspension contains less than 80 wt.-% of water and is useful as rheological modifier for cementitious applications. In the hydrocolloid particle suspension, the hydrocolloid particles are stabilized against premature swelling. The suspension exhibits adequate viscosity for ease of handling and dosage and is shelf-stable.

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.

The present invention relates to treatment of subterranean formations using compositions that experience an increase in viscosity as a result of the application of heat or shear. In various embodiments, the present invention provides a method of treating a subterranean formation. The method can include obtaining or providing a composition including a linear triblock copolymer and inorganic particles. The method can include at least one of shearing and heating the composition, to increase the viscosity thereof. The method can also include contacting the composition with a subterranean material downhole.

Compositions including cement and an additive and methods for making compositions and/or concrete mixtures including a cement and an additive are provided.