NANO-SURFACTANTS FOR ENHANCED HYDROCARBON RECOVERY AND METHODS OF FORMING AND USING SUCH NANO-SURFACTANTS Russian patent published in 2019 - IPC E21B43/22 C09K8/584 C09K8/92 

FIELD: chemistry.

SUBSTANCE: present invention relates to methods and systems for formation of stabilized emulsion and extraction of hydrocarbon material from underground formation. Method of producing hydrocarbon material from at least one subterranean formation and oil-bearing sandstone, comprising mixing amphiphilic nanoparticles with carrier fluid to form a suspension, amphiphilic nanoparticles include a main part, hydrophobic groups attached to the first side of the main part, and hydrophilic groups containing anionic or cationic functional groups attached to the second side of the main portion, before contacting at least one subterranean formation and suspension, including oil-bearing sandstone and water, suspension pH is modified with the suspension, where the modification involves reducing the pH value of the suspension containing amphiphilic nanoparticles, including cationic functional groups, to increase solubility of amphiphilic nanoparticles in suspension, which reacts to reduction of pH value of suspension, or increase of pH value of suspension containing amphiphilic nanoparticles, including anionic functional groups, to increase solubility of amphiphilic nanoparticles in suspension, which reacts to increase pH of suspension, contacting at least one subterranean formation and suspension, including oil-bearing sandstone and water, with a suspension to form an emulsion stabilized by amphiphilic nanoparticles, and removal of hydrocarbons from the emulsion stabilized by amphiphilic nanoparticles. Method for forming a water flooding suspension, comprising hydrolysis of a hydrophilic compound containing at least one of the following compounds: orthosilicate, oxysilane, aminosilane, silanol, epoxysilane and metal alkoxide, forming an exposed hydroxyl group, hydrolysis of the hydrophobic compound containing oxysilane, including a non-polar hydrocarbon group, interaction of the exposed group of the hydrophilic compound with the hydroxyl group of the hydrophobic compound, wherein amphiphilic nanoparticles are formed, and amphiphilic nanoparticles are mixed with at least one carrier fluid. Suspension for extraction of hydrocarbons from underground reservoir by water flooding, including multiple amphiphilic nanoparticles, including base material, containing at least one of compounds: silicon dioxide, metal and metal oxide, a plurality of hydrophilic functional groups located on the surface of the base material, and a plurality of hydrophobic functional groups located on the opposite surface of the base material, and at least one carrier fluid, wherein the pH value of the suspension is lower than 3.0. Invention is developed in dependent items of the formula.

EFFECT: technical result is higher efficiency of hydrocarbons extraction from underground formation.

20 cl, 5 dwg