7results about How to "Change wettability" patented technology

The preparation method comprises the steps that firstly, a carbon source and a nitrogen source are stirred and mixed to be uniform, alkylamine polyoxyethylene ether is added into the mixture under the water bath heating condition, the mixture is sealed and stirred to form a light yellow block, then a solid-phase pyrolytic reaction is conducted, and a black solid product is obtained; grinding the black solid product, dispersing in n-hexane, and washing; and adding absolute ethyl alcohol and further washing by combining ultrasonic waves to obtain a black powdery product. Dissolving the product in deionized water, filtering and purifying, and carrying out centrifugal separation on the obtained black liquid; dialyzing the clear liquid, and finally drying the solution in a dialysis bag to obtain the nitrogen-doped quantum dots. Preparing nitrogen-doped quantum dot dispersion liquid by using on-site injection fluid; and injecting the dispersion liquid into a target reservoir, soaking for 1-2 days, and then opening the well for production. The nitrogen-doped quantum dots are suitable for low-permeability (ultra-low permeability) oil reservoirs, compact oil reservoirs and shale oil reservoirs, and the recovery efficiency of crude oil is economically and efficiently improved.

This invention provides a method for preparing a high-salinity zinc oxide-resistant nanofluid mediated by Halomonas sp. and its application in enhancing oil recovery. Specifically, it includes: a Halomonas sp. strain CDH-2, with accession number CCTCC NO: M 2025786, which can rapidly grow in high-concentration salt solutions and produce salt-resistant extracellular metabolites. Fermenting and culturing CDH-2 under high-salt conditions yields a fermentation broth with a surface tension below 30 mN / m. Mixing and culturing the obtained fermentation broth with a metal precursor solution yields a high-salinity-resistant metal nanofluid. The resulting metal nanofluid maintains good stable dispersibility in high-salinity water and effectively reduces oil-water interfacial tension. It alters the wettability of oil-wetting surfaces, emulsifies and disperses crude oil, and reduces crude oil viscosity. Therefore, it can be used as an enhanced oil recovery agent in high-salt reservoirs and is widely applied in oilfield flooding, well huff and puff, and heavy oil viscosity reduction.

The invention relates to the technical field of mineral processing, and provides a method for extracting fine iron powder from raw iron ore, which comprises the following steps: crushing and screening the raw iron ore to obtain crude raw iron ore; performing first-stage grinding, first-stage magnetic separation, second-stage grinding, second-stage magnetic separation, third-stage magnetic separation, flotation extraction and drying on the crude iron ore to obtain fine iron powder; a collecting agent is added during flotation extraction, and the collecting agent is prepared from the following components in parts by weight: 42 to 45.5 parts of sodium oleate, 18 to 19.5 parts of sodium stearate, 8 to 11.5 parts of benzohydroxamic acid, 5 to 7.5 parts of nonylcyclohexanol polyoxyethylene ether, 5 to 7 parts of castor oil polyoxyethylene ether, 5 to 7.5 parts of polypropylene glycol and 2 to 4.5 parts of sodium citrate. By means of the technical scheme, the problem that in the prior art, the iron recovery rate of fine iron powder extracted from raw iron ore is insufficient is solved.

The application discloses a production and preparation process of a heavy-duty water-based epoxy primer suitable for a high-salt and high-humidity environment, and relates to the technical field of water-based epoxy primer production. The raw materials are as follows: 30-50 parts of bisphenol A type water-based epoxy resin emulsion, 10-20 parts of a curing agent T-31, 3.5-5 parts of a reinforced anti-settling agent, 8-12 parts of zinc phosphate, 5-8 parts of aluminum tripolyphosphate, 10-15 parts of precipitated barium sulfate, 3-6 parts of silicon powder, 0.8-1.2 parts of a polyacrylic acid sodium salt dispersing agent, 0.4-0.8 parts of an organic silicon defoaming agent, 0.3-0.7 parts of an acrylic ester leveling agent and 0.6-1 part of a polyurethane thickening agent. The bentonite in the reinforced anti-settling agent and the modified phosphosilicate zirconium powder can improve the microstructure of the primer system, the coating is more compact, the primer can be conveniently applied to a high-salt and high-humidity environment, and the salt mist resistance of the water-based epoxy primer is enhanced.

The application discloses a preparation method of a functional composite diaphragm and relates to the technical field of hydrogen production by water electrolysis. The preparation method comprises the following steps: preparing a casting solution: mixing a polymer with a solvent, heating and dispersing to prepare a uniform polymer solution; mixing zirconium oxide and a coupling agent with the solvent, ultrasonic dispersion to obtain an inorganic material dispersion liquid containing the coupling agent; under stirring, adding the dispersion liquid into the polymer solution, continuously stirring to obtain a uniform casting solution; forming a base film: coating the casting solution on a polyphenylene sulfide support net, placing in an oven after standing at room temperature to dry, and obtaining a composite base film; surface modification: sequentially immersing the composite base film in a first organic alkali solution and a second organic alkali solution, washing with a solvent after each immersion, and obtaining the functional composite diaphragm after washing.

The invention provides an emulsified oil-displacing agent and a method for improving the recovery efficiency of a heavy oil reservoir. The emulsified oil-displacing agent comprises water-soluble carbonate, choline chloride and urea in a molar ratio of 1: 2: 1. The method for improving the recovery efficiency comprises the steps that gas 0.1-0.2 PV is injected into a reservoir through an injection well in an injection-production well pattern of a target oil reservoir; after gas injection is completed, the 0.05-0.2 PV emulsified oil-displacing agent is continuously injected into the reservoir stratum through the injection well, and the concentration of the total mass of the water-soluble carbonate, choline chloride and urea is not lower than 0.5% on the basis that the total mass of the oil-displacing agent is 100%; and after injection of the emulsified oil-displacing agent is completed, hot water with the temperature of 50-80 DEG C and the pressure of 0.1-0.3 PV is continuously injected into the reservoir stratum through the injection well. According to the technical scheme, in-situ profile control and displacement of the remaining oil of the heavy oil reservoir entering the later stage of steam flooding can be effectively achieved, the longitudinal swept volume is increased, and the recovery efficiency is improved.

The utility model discloses a plate heat exchanger with a turbulent flow structure, which belongs to the field of plate heat exchangers and comprises a heat exchanger body, the outer end of the heat exchanger body is movably connected with a positioning mechanism, the inner end of the positioning mechanism is provided with a turbulent flow mechanism, and the positioning mechanism comprises a reinforcing rod. The reinforcing rods are evenly distributed at the inner end of the heat exchanger body, the outer ends of the reinforcing rods are each sleeved with a plurality of limiting blocks, the outer ends of the limiting blocks are each movably connected with a reinforcing ring, and each reinforcing ring is of a semicircular structure; the limiting blocks and the reinforcing rods can be reinforced and supported by arranging the reinforcing rings, during disassembly and maintenance, the multiple positioning rods are pulled to drive the clamping blocks to relieve positioning with the reinforcing rods, the multiple limiting blocks and the reinforcing rods can be conveniently separated, the internal turbulent flow structure of the plate heat exchanger is more convenient to maintain, and the maintenance efficiency is improved. And the practicability of the plate heat exchanger with the turbulent flow structure is improved.