Hydrophobic compound emulsions free of silicon and fluorine for an oil recovering method that modifies the wettability of rocks from hydrophilic to oleophilic
AssigneeInstituto Mexicano Del Petroleo
InventorsNatalya Victorovna Likhanova, Iryna Igorevna Demikhova, Joaquin Rodolfo Hernandez Perez, Andres Eduardo Moctezuma Berthier, Crescencio Octavio Olivares Xometl, Miguel Angel Cuapantecatl Mendieta
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Abstract
An oil recovery method by the modification of the rock wettability from hydrophilic to oleophilic using hydrophobic compounds. Specifically, the method relates to the application of oil-type emulsions in water based on hydrophobic compounds free of silicon and fluorine to increase the oil recovery in mature sandstone-type reservoirs after the injection of water.
Claims16
A method of increasing oil production of wells in mature sandstone rock, comprising the steps of:
- introducing an oil-in-water emulsion into the well to modify the wettability of the sandstone rock, said emulsion comprising (1) a hydrophobic compound (A), where said compound (A) is a liquid phase at room temperature, insoluble in water and free of silicon and fluorine, and (2) an aqueous solution of an emulsifier (B), and recovering oil from the well,
- wherein said hydrophobic compound (A) has the formula C+Y−
- where Y− is an organic anion selected from the group consisting of chlorine, bromine, iodine, an organic carboxylate, an organic dicarboxylate, an organic sulfonate, and
- C+ is a cation selected from the group consisting of quaternary phosphonium cation;
- and an organic trialkyl sulfonium cation, and
- (B) is an alkyl sulfate, alkylpolyglycol ether or polyethoxylated alkyl polyphenol ether.
A method of increasing oil production of wells in mature sandstone rock, comprising the steps of:
- introducing an oil-in-water emulsion into the well to modify the wettability of the sandstone rock, said emulsion comprising (1) a hydrophobic compound that is a liquid at room temperature, insoluble in water and free of silicon and fluorine, and (2) an aqueous solution of an emulsifier (B), and
- recovering oil from the well,
- wherein said hydrophobic compound (A) has the formula C+Y− where
- Y− is an organic anion selected from the group consisting of chlorine, bromine, iodine, an alkyl carboxylate, a cycloalkyl carboxylate, a benzyl alkenyl carboxyl ate, an alkyl sulfonate, cycloalkyl sulfonate, and benzyl alkenyl sulfonate, and
- C+ is a cation selected from the group consisting of quaternary phosphonium cation and an organic trialkyl sulfonium cation, and
- (B) is a surfactant having an HLB above 10 and selected from the group consisting of a C8-18 is alkyl sulfate, C8-19 alkyl ether sulfate, a C2-40 alkylpolyglycol ether, and a C2-40 alkyl polyethoxy polyphenol ether, and where said emulsion comprises 1-5 parts by weight of said surfactant (B) based on 100 parts of said hydrophobic compound (A).
Dependencies are inferred from the claim text.