23results about How to "Change wettability" patented technology

The invention discloses a nano imbibition oil displacement agent as well as a preparation method and application thereof. The preparation method of the nano imbibition oil-displacing agent comprises the following steps: reacting citric acid, glucose, long-chain amine, a surfactant, an organic solvent, short-chain alcohol and water at 140-200 DEG C under 0.4-0.5 MPa for 6-16 hours to obtain the nano imbibition oil-displacing agent. The method disclosed by the invention is simple, convenient, environment-friendly and low in cost, and the prepared nano imbibition oil displacement agent has good surface and interface activity at high temperature and high salt, can be used as an imbibition oil recovery agent for an ultra-low permeability reservoir, and can remarkably improve the oil recovery rate.

The invention discloses a three-sludge treatment agent and a preparation method thereof, and belongs to the technical field of oily sludge treatment, the three-sludge treatment agent comprises a treatment agent A and a treatment agent B. The treatment agent B comprises the following raw materials by mass: 30-40 parts of polyacrylamide, 8-10 parts of modified attapulgite clay, 5-6 parts of a compound, and 40-55 parts of deionized water. The modified attapulgite clay is strongly combined with protective films at oil-water and oil-sludge interfaces in the oil sludge through electrostatic force, hydrogen bonds and hydrophobic interaction, the protective films at the oil-water and oil-sludge interfaces are destroyed, oil drops are released and coalesced to form an oil phase, and separation of oil, water and sludge is achieved; positive charges carried in the modified attapulgite clay can be adsorbed to the surfaces of sludge particles with negative charges to be settled and separated out; carboxyl groups contained in the modified hemicellulose can be combined with hydrophilic groups of sophorolipid to form stable mixed micelles, so that the situation that the sophorolipid is easily influenced by the environment to lose efficacy, and oil drops are regathered and precipitated is avoided.

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.

The invention belongs to the technical field of oil-solid two-phase particle filtration, and particularly relates to a modified glass fiber filter material for oil-solid two-phase particle air filtration and a preparation method thereof. The modified glass fiber filter material is obtained by depositing a modified nano silicon dioxide solution on the surface of the glass fiber filter material through an impregnation method; wherein the modified nano silicon dioxide is obtained by modifying nano silicon dioxide through a silane coupling agent. Modified nano silicon dioxide is obtained by grafting a functional group with oleophylic performance on the surface of nano silicon dioxide through silane, and then the modified nano silicon dioxide is added on the surface of the filter material to change the surface roughness of the filter material, so that the wettability of the filter material is changed from two aspects, and the separation of deposited oil and solid particles on the filter material can be realized; the oil accumulated on the surface of the filter material is quickly conveyed into the filter material, so that the flowing capacity of the oil on filter fibers is enhanced, the formation of an oil film is inhibited, and the increase rate of pressure drop in the filtering process is reduced.

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 discloses a heat-resistant and salt-resistant nano-fracturing imbibition agent and a preparation method thereof, and belongs to the technical field of oil and gas exploitation. A heat-resistant and salt-resistant nano-fracturing imbibition agent is composed of the following components: starch, acrylic acid, ammonium persulfate, sodium bisulfite, quaternary ammonium salt, interfacial tension reducer, and deionized water. The heat-resistant and salt-resistant nano-fracturing imbibition agent provided by the invention has a hydrophobic associating polymer and an interfacial tension reducer as the main components, and has excellent heat resistance, salt resistance, and shear resistance; the formation adsorption loss is small, the oil-water interfacial tension is low, and it can penetrate into the deep part of the low-permeability reservoir, change the wettability of the rock, and through a certain period of well sealing after fracturing, the surfactant is absorbed into the pore throat of the ultra-low permeability reservoir, and more crude oil is absorbed and replaced, thereby improving the fracturing effect of the tight oil layer, delaying the production decline rate, and improving the single well production and recovery rate; the raw materials are widely available, the cost is low, the method is simple and easy to operate, and it is suitable for industrial production.

The present invention provides a nitrogen surfactant composite injection method and application, and relates to the field of oil production technology. The method comprises sequentially injecting a composite surfactant front plug, a nitrogen main plug, a composite surfactant rear plug, and a nitrogen rear plug into the oil reservoir, shutting the well, and opening the well for production; wherein the composite surfactant in the composite surfactant front plug and the composite surfactant rear plug comprises: a main surfactant, an auxiliary surfactant, and water; the main surfactant comprises an oil-soluble surfactant and a fatty amide propyl dimethyl amine oxide; the auxiliary surfactant comprises a fatty alcohol polyoxyethylene polyoxypropylene block copolymer and a natural surfactant. The method can greatly reduce the oil-water interfacial tension, and can effectively inhibit the occurrence of gas cross-flow in the exploitation of low-permeability fault block oil reservoirs. The reagent enters a farther well area under the high pressure of nitrogen, thereby improving the oil washing efficiency and oil increase effect.

The invention provides a viscosity reducer as well as a preparation method and application thereof. The invention provides a viscosity reducer which comprises the following raw materials in parts by weight: 10-50 parts of a non-polar component A, 10-60 parts of a polar component B and 30-50 parts of a surfactant C, the non-polar component A is selected from one or more of octane, petroleum ether, dotridecane, octacosane, carbon disulfide, carbon tetrachloride, ethane, cyclohexane, liquid paraffin, ethyl acetate and diethylene glycol monobutyl ether; the polar component B is prepared by reaction of styrene, maleic anhydride and acrylate; the surfactant C is prepared by reacting the polar component B, organic acid and polyamine. According to the viscosity reducer for the oil-based drilling fluid, provided by the invention, the viscosity and the shearing force of the oil-based drilling fluid can be remarkably reduced, the flowability of the oil-based drilling fluid is improved, and particularly, the viscosity and the shearing force of the polluted oil-based drilling fluid can be reduced.

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 discloses a coal seam permeability increasing type water injection method, and belongs to the technical field of coal mining. The method comprises the steps of drilling construction, primary gas extraction, acid liquid pressure operation, alkali liquid pressure operation, secondary gas extraction, drilling flushing operation and surfactant solution injection operation. According to the method, based on the advantages and disadvantages of a water injection source and drilling selection, the water injection source and the drilling selection are innovatively combined, mine water subjected to softening treatment is used, a synergistic surfactant is added, intermittent circulating water injection is adopted, the wettability of a coal seam can be improved, and the coal seam quality is improved. The pressure of part of water-deficient areas can be effectively relieved, and the utilization rate of water resources is increased. According to the method, the anti-reflection drill holes are selected, on one hand, the gas extraction rate before water injection can be improved, on the other hand, construction is flexible, and the coal seam permeability can be improved so that water can be more evenly injected into the coal seam.

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 invention relates to the technical field of oilfield chemistry, and discloses a pressure-reducing and injection-increasing surfactant and a preparation method thereof. The invention provides a pressure-reducing and injection-increasing surfactant by adding quaternized carbon nanotubes, adamantane-modified nano silicon dioxide, sodium dodecyl diphenyl ether disulfonate, methyl amyl alcohol, trimethylsilyl glucoside and water into a reaction kettle and stirring the mixture. The pressure-reducing and injection-increasing surfactant can reduce the tension of the oil-water interface and inhibit clay expansion, thereby improving the permeability of injected water and playing the role of pressure-reducing and injection-increasing. The intermediate 2 contains a large number of hydroxyl groups, which increase the grafting sites and substitution degree of the carbon nanotubes. The carbon nanotubes can prevent clay expansion and form a nano film on the surface of the rock. The nano film can change the wettability of the rock, thereby reducing the flow resistance of water in the rock pores and achieving the effect of reducing the injection pressure. The nano silicon dioxide itself can also reduce the pressure and injection-increasing.

The invention belongs to the field of oil and gas field development, and discloses a retarded acid system for acidification transformation of clay type shale oil reservoirs and application of the retarded acid system. According to the method, an acid rock reaction speed equation is taken as a theoretical basis, the control on the acid rock speed is realized by controlling two main parameters, namely H + concentration and an acid rock contact area, which influence the reaction speed, so that the deep penetrating power of the acid liquor is realized, the acid liquor can effectively enter the deep part of a reservoir, and meanwhile, the generation of acidification secondary precipitation can be reduced; the surfactant additive is added to reduce the influence of a water-based acid liquid system on high-clay minerals, blockage removal and acidification transformation are mainly performed on calcite, dolomite, siderite and pyrite in high-clay reservoir stratification, an effective acid etching channel is formed, shale oil rock wettability is changed by adding the surfactant additive, the fluidity of crude oil is improved, and the high-clay reservoir stratification effect is improved. While an effective oil transportation channel is formed through effective transformation, the fluidity of crude oil is improved, the resistance of rocks is reduced, and the purpose of high yield is achieved.

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.

The invention provides a laser pretreatment method for improving film-substrate binding force of a PVD (Physical Vapor Deposition) coating on a magnesium alloy surface, and belongs to the technical field of magnesium alloy surface treatment. According to the method, a functional micro-nano structure is processed on the surface of the magnesium alloy base material through ultrafast laser treatment under the protection of inert gas, so that the wettability of the base material is changed, and the film-substrate binding force of the PVD coating on the surface of the magnesium alloy is effectively improved. The pretreatment method provided by the invention is high in machining precision, high in machining efficiency and accurate and controllable in machining range, can effectively avoid surface oxide inclusion, and has a good application prospect. The pretreatment method also provides a method for realizing controllable film-substrate binding force gradient of the PVD coating on the surface of the magnesium alloy.

The invention discloses an acid-soluble cement slurry plugging agent for oil wells and a preparation method thereof, and belongs to the technical field of plugging agents. The acid-soluble cement slurry plugging agent for oil wells comprises the following components in parts by weight: 55-80 parts of G-grade oil well cement, 5-30 parts of calcium carbonate powder, 5-25 parts of lime powder, 5-15 parts of bentonite powder, 5-10 parts of modified acid-soluble gel, 5-10 parts of modified tricalcium phosphate, 5-10 parts of fluid loss reducer and 1-5 parts of accelerator. The preparation method of the acid-soluble cement slurry plugging agent for oil wells of the present invention comprises: mixing G-grade oil well cement, bentonite powder, lime powder, calcium carbonate powder, modified acid-soluble gel, modified tricalcium phosphate, fluid loss reducer and accelerator in two steps to obtain the acid-soluble cement slurry plugging agent for oil wells. The present invention significantly improves the compressive strength and acid dissolution effect of the acid-soluble cement slurry plugging agent for oil wells.

The invention discloses a repairing method suitable for a shaft integrity casing cement sheath gap, which comprises the following steps: firstly, pretreating a casing cement sheath gap section to fully expose a leakage point, then pumping a surface treatment liquid to the leakage point, circularly cleaning the gap, changing the wettability of the surface of the casing / cement sheath gap, preparing repairing plugging slurry on site, and pumping all slurry. After the inner liquid level and the outer liquid level of the continuous oil pipe are flush, the continuous oil pipe is lifted to a designated position, the surface treatment liquid is continuously used for pushing the repairing and blocking slurry into the leakage point, the squeezing pressure change condition is observed, the squeezing amount is recorded, if the squeezing pressure reaches the set pressure, squeezing is stopped, all the continuous oil pipe is taken out, and well closing, pressure building and cement waiting are conducted. Under the combined action of the surface treatment liquid and the repairing and plugging slurry, the repairing effect is ensured, the surface treatment liquid treats the gap surface, the contact capacity of the repairing and plugging slurry and the surface of the repairing and plugging slurry is improved, and it is avoided that after the repairing and plugging slurry is cured, gaps are generated in the contact face of the sleeve / cement sheath.

The invention belongs to the technical field of oil and gas reservoir development and research, and discloses a dialysis oil displacement fracturing fluid as well as a preparation method and application thereof. The dialysis oil displacement fracturing fluid comprises the following components: water, a resistance reducing agent, an oil gas displacer, a clay stabilizer, a cleanup additive, a demulsifier and a gel breaker. Based on the total weight of the dialysis oil displacement fracturing fluid, the content of the water is 98.7%-99.2%, the content of the resistance reducing agent is 0.2%-0.3%, the content of the oil gas displacing agent is 0.15%-0.25%, the content of the clay stabilizer is 0.25%-0.35%, the content of the cleanup additive is 0.05%-0.15%, the content of the demulsifier is 0.15%-0.35%, and the content of the gel breaker is 5-15 ppm. The method greatly improves the formation pressure coefficient, greatly reduces the water content of the output liquid, and improves the daily oil production in the test stage.

The invention discloses a corrosion inhibitor composition which is composed of a compound shown in a formula 1, a compound shown in a formula 2 and water. According to the total mass of the corrosion inhibitor composition as 100%, the content of the compound shown in the formula 1 is 15 wt%-35 wt%, and the content of the compound shown in the formula 2 is 5 wt%-20 wt%. The temperature-resistant corrosion inhibitor composition can obviously reduce the corrosion rate of metal and reduce loss caused by corrosion, can be widely applied to the fields of oilfield water injection, oil extraction, gathering and transportation and the like, protects oil-water well shafts, pipelines and equipment, and effectively relieves the corrosion problem. The corrosion inhibitor composition disclosed by the invention can also be applied to an industrial circulating water system and an oil refining industry.

The invention relates to the technical field of brake disc preparation, and in particular to a preparation process of a prepreg for a short fiber molded carbon / carbon brake disc; the nickel acrylate and methacrylate 4-boric acid phenol ester react with the thiol group on the surface of the carbon fiber to change the polarity or wettability of the surface of the carbon fiber; the impregnation liquid penetrates into the microstructure of the carbon fiber and interacts with the functional groups on the surface of the carbon fiber to form a stronger adhesion; this combination can increase the roughness of the carbon fiber surface and improve the friction coefficient between the carbon fiber and other materials, thereby improving the friction and wear performance of the brake disc, and the nickel / iron doped carbon fiber may have better mechanical properties and thermal stability, which can also improve the performance of the brake disc; the short fiber molded carbon / carbon brake disc prepreg prepared by the invention has significantly improved friction and wear performance, a small friction coefficient and good recovery performance, and can be used as a high-performance, pollution-free, green and environmentally friendly friction material.

The present invention provides a nano surfactant for oil washing, preparation and application thereof. The preparation method comprises the following steps: uniformly mixing a water-soluble component, an oil-soluble component and a surfactant to obtain a premix; heating the premix to 140-300°C under an atmospheric environment so that the material is in a molten state and a polycondensation reaction occurs between the materials, and after reacting for 10-180 minutes, nanoparticles having a hydrophilic group and a hydrophobic group are obtained. The prepared nano surfactant can have a high oil washing efficiency (more than 50%) at a relatively low concentration (0.005-0.1wt%), is not easily adsorbed by the formation, has a relatively low dynamic adsorption amount (≤5%), can emit a relatively strong fluorescence after being excited by light, and can be used as a fluorescent tracer to monitor the concentration and extraction of the nano surfactant underground. The preparation process is simple, the raw material cost is low, it is non-toxic, and it is easy to realize large-scale production.