The present invention relates to the use of sacrificial agents to counteract the deleterious impact of gypsum contaminants on the effectiveness of certain stucco additives, particularly, water reducing agents and foaming agents, in a stucco slurry used to make gypsum wallboard.

The present invention relates to the use of sacrificial agents to counteract the deleterious impact of gypsum contaminants on the effectiveness of certain stucco additives, particularly, water reducing agents and foaming agents, in a stucco slurry used to make gypsum wallboard.

Suspensions of elastomer particles for cement compositions and associated methods of cementing. An example method includes providing a suspension of elastomer particles. The suspension of elastomer particles includes elastomer particles, an aqueous fluid, a viscosifier, a surfactant, and a clay-based stabilizer. The suspension may be combined with a cement slurry to form a cement composition. The cement slurry includes a cement and a base fluid. The cement composition may be introduced into a wellbore penetrating a subterranean formation. The cement composition may be allowed to set in the wellbore.

A regulating cementitious material for promoting hydration of Portland cement is provided. The regulating cementitious material may include ingredients by weight as follows: ye'elimite, 2768 parts; anhydrite, 2968 parts; lithium nitrite, 25 parts; ethylene glycol monoisopropanolamine, 0.140.29 parts; triethanolamine acetate, 0.040.09 parts; and polyglycerol, 0.040.09 parts. An early strength of Portland cement can be improved through a cooperative hydration between minerals and an enhanced solubilization of a complexing agent.

The invention relates to the oil production industry. The present method includes consecutively pumping an active pack and a displacement fluid into the near-wellbore region of a formation. The active pack is an emulsion system containing: 15-30 vol % diesel fuel or treated oil from an oil preparation and pumping station, 2-3 vol % emulsifier, 0.5-1 vol % colloidal solution of hydrophobic silicon dioxide nanoparticles, and the remainder as an aqueous solution of calcium chloride or potassium chloride. The colloidal solution of hydrophobic silicon dioxide nanoparticles contains: 31-32.5 vol % amorphous silicon dioxide, 67-69 vol % propylene glycol monomethyl ether, and the remainder as water. The displacement fluid is an aqueous solution of calcium chloride or potassium chloride to which 1-2 vol % of IVV-1 or ChAS-M brand water repellent is added. The emulsifier is a composition having the following formulation: 40-42 vol % esters of higher unsaturated fatty acids (linoleic, oleic, linolenic) and resin acids, 0.7-1 vol % amine oxide, 0.5-1 vol % high molecular weight organic heat stabilizer, and the remainder as diesel fuel (summer diesel or winter diesel). The technical result of the invention is greater efficiency of geological and engineering operations involved in the killing of oil and gas wells, high heat stability and aggregate stability of the emulsion system for killing wells, and also the possibility of adjusting the viscosity properties of the emulsion system according to the porosity and permeability characteristics and the geological and physical characteristics of the near-wellbore region of a formation.

The invention relates to the oil production industry. The present method includes consecutively pumping an active pack and a displacement fluid into the near-wellbore region of a formation. The active pack is an emulsion system containing: 15-30 vol % diesel fuel or treated oil from an oil preparation and pumping station, 2-3 vol % emulsifier, 0.5-1 vol % colloidal solution of hydrophobic silicon dioxide nanoparticles, and the remainder as an aqueous solution of calcium chloride or potassium chloride. The colloidal solution of hydrophobic silicon dioxide nanoparticles contains: 31-32.5 vol % amorphous silicon dioxide, 67-69 vol % propylene glycol monomethyl ether, and the remainder as water. The displacement fluid is an aqueous solution of calcium chloride or potassium chloride to which 1-2 vol % of IVV-1 or ChAS-M brand water repellent is added. The emulsifier is a composition having the following formulation: 40-42 vol % esters of higher unsaturated fatty acids (linoleic, oleic, linolenic) and resin acids, 0.7-1 vol % amine oxide, 0.5-1 vol % high molecular weight organic heat stabilizer, and the remainder as diesel fuel (summer diesel or winter diesel). The technical result of the invention is greater efficiency of geological and engineering operations involved in the killing of oil and gas wells, high heat stability and aggregate stability of the emulsion system for killing wells, and also the possibility of adjusting the viscosity properties of the emulsion system according to the porosity and permeability characteristics and the geological and physical characteristics of the near-wellbore region of a formation.

A method for synthesizing calcium-silicate-based porous particles (CSPPs) is described. Control over CSPP morphology and pore size is achieved through a refined solution-based synthesis, allowing loading of a variety of sealants. These particles, upon external stimuli, release the loaded sealant into the surrounding material. Methods of loading the CSPPs with loading sealant are described. The CSPPs may be used in pure form or mixed with another material to deliver self-healing, sealing and multi-functional properties to a physical structure. The composition of the CSPPs is described, along with methods of use of the CSPPs.

A method of manufacturing a cementitious composition comprising: dispersing expanded polymeric microspheres into a liquid dispersion, optionally wherein the liquid dispersion comprises an aqueous dispersion; and incorporating the liquid dispersion comprising expanded polymeric microspheres into the cementitious composition; wherein the expanded polymeric microspheres are present in the liquid dispersion in an amount of about 0.1 to about 15 percent by weight, based on the total weight of the dispersion, prior to incorporation into the cementitious composition. An admixture for cementitious compositions comprising unexpanded polymeric microspheres and sodium hydroxide.

A method of cementing may comprise: providing a bulk dry cement, wherein the bulk dry cement comprises a dry blend of cement and a solid resin accelerator, wherein the solid resin accelerator comprises a liquid resin accelerator on a solid particle; preparing a cement slurry comprising: the bulk dry cement; water; and a liquid hardenable resin component; and introducing the cement slurry into a wellbore.

Provided are separators for use in an electrochemical cell comprising (a) an inorganic oxide and (b) an organic polymer, wherein the inorganic oxide comprises organic substituents. Also provided are electrochemical cells comprising such separators.