A system and method for water shutoff, including providing a treatment fluid including a polymer and a nitrogen-generating compound through a wellbore into a water zone in a subterranean formation, generating nitrogen gas in the water zone by a reaction of the nitrogen-generating compound, generating foam from the nitrogen gas and the treatment fluid in the water zone to give foamed polymer in the water zone, and sealing the water zone with the foamed polymer.

A system and method for water shutoff, including providing a treatment fluid including a polymer and a nitrogen-generating compound through a wellbore into a water zone in a subterranean formation, generating nitrogen gas in the water zone by a reaction of the nitrogen-generating compound, generating foam from the nitrogen gas and the treatment fluid in the water zone to give foamed polymer in the water zone, and sealing the water zone with the foamed polymer.

A method for validating a homogenizing valve (1), comprising the steps of: —preparing an emulsion having a hydrophilic phase comprising, in weight percentage on the total weight: from 55% to 74% demineralized water, from 10% to 20% glycerin and from 3% to 4,2% butylene glycol, and a lipophilic phase comprising, in weight percentage on the total weight: from 5.1% to 5.9% squalane, from 7.2% to 8.8% caprylic acid alkyl ester and from 0.665% to 0.735% cetyl alcohol; —subjecting the emulsion to forced passage within the homogenizing valve (1) from a high pressure zone (HP) to a low pressure zone (LP) a plurality of times.

The present disclosure relates to a dispersant containing a specific compound having a fluorene skeleton, and a composition using the same.

The present disclosure is directed to novel derivatives of terpenes, particularly ester derivatives of terpene alcohols, and methods of making them, compositions comprising them, and methods for using them.

The present disclosure is directed to novel derivatives of terpenes, particularly ester derivatives of terpene alcohols, and methods of making them, compositions comprising them, and methods for using them.

A process for producing a microemulsion or nanoemulsion comprising water and at least one hydrocarbon or oil, comprising the steps of: a) providing the hydrocarbon or oil, water, one or more additives, a solvent, and a hydrophilic surfactant formulation comprising an amine or amide derivative non-ionic surfactant which is a fatty acid alkanolamide, one or more ethoxylated alcohols and/or ethoxylated alkylphenols, and a non-ionic fatty acid ester; b) by a mixing or stirring device operating at a mixing or stirring speed in the range 100 rpm and 15000 rpm, mixing or stirring the hydrophilic surfactant formulation and additive into the solvent, to produce a hydrophilic self-emulsifying blend; c) adding water to the hydrophilic self-emulsifying blend and the hydrocarbon or oil to produce a water-in-hydrocarbon/oil microemulsion or nanoemulsion, wherein the microemulsion or nanoemulsion comprises: 46% or more by mass of the hydrocarbon or oil, 4% to 36% by mass of water, a mass ratio of hydrophilic surfactant formulation to water in the range 1:10 to 1:2, 0.1% to 5% by mass of additive, 1.2% or more by mass of the solvent, a dispersed particle size in the range 1 nm to 500 nm, and a polydispersity index of 35% PdI or less, wherein the percentages by mass of the hydrocarbon or oil, water, formulation, additive and solvent together add up to 100%.

The present invention is a powdered dispersant for hydraulic compositions containing a copolymer obtained by polymerizing raw material monomers containing a predetermined monomer 1 containing AO group with a number of added moles n falling within a predetermined range and a predetermined monomer 2 having a predetermined group such as a carboxylic acid group or the like, wherein a ratio of monomer 2 in the raw material monomers is 22 mass % or more, and a product of a value of n of monomer 1 and a value of mass % of the ratio is 420 or more and 2600 or less.

New surfactants with emulsifying, bio and eco-compatible properties, having long-chain aliphatic amides, obtained by a green method, deriving from amino acids, fatty acids and/or oils and/or butters, treated with microwave irradiation are provided.

New surfactants with emulsifying, bio and eco-compatible properties, having long-chain aliphatic amides, obtained by a green method, deriving from amino acids, fatty acids and/or oils and/or butters, treated with microwave irradiation are provided.