280results about How to "High interface activity" patented technology

The present invention is one kind of thick oil demulsifier and its preparation process, and belongs to the field of petrochemical technology. The present invention features that phenol-amine resin as the initial material is block polymerized with epoxy propane ad epoxy ethane under the action of catalyst to obtain stereo netted macromolecular polyether as the thick oil demulsifier. The polyether as the thick oil demulsifier may be further chain expanded for even high demulsifying effect. The thick oil demulsifier can reach the oil-water interface fast to lower the elasticity and viscosity of the interface film, speed the aggregation of liquid drops and demulsify effectively. The thick oil demulsifier has simple preparation process, is suitable for industrial production, and may be used in the efficient dewatering of oil field produced liquid with different water contents.

The invention relates to a method for preparing a fluorine-containing modified amphoteric water-soluble polymer, in particular to a method for preparing the fluorine-containing modified amphoteric water-soluble polymer by a cosolvent method and belongs to the technical field of water-soluble macromolecular synthesis. Methacryloyl ethyl-N and N-dimethyl propanesulfonic acid (DMAPS) as amphoteric monomers and perfluoro hexyl ethyl acrylate (PFHEA) and acrylamide (AM) as hydrophobic monomers are copolymerized in a single solvent; azobisisobutyronitrile (AIBN) is used as a catalyst; and the fluorine-containing modified amphoteric water-soluble polymer is obtained. The polymer has good water solubility and remarkable interface activity, thickening, shearing resistance, temperature resistance and salt resistance. Through a mixed solution of anhydrous acetone and anhydrous ether, the polymer is precipitated, dried and pulverized to obtain a powdery product; and the powdery product has wide application prospect in the development of an oil field, dope, printing, household chemical, medicament and other fields.

The invention provides a foaming agent for low gas liquid ratio foam flooding for improving recovery ratio of common heavy oil reservoir and an injection method thereof. The foaming agent is prepared from a nonionic-anionic surfactant, a betaine type amphoteric surfactant and water, wherein the nonionic-anionic surfactant accounts for 0.01 to 0.03 weight percent of the total weight; the betaine type amphoteric surfactant accounts for 0.05 to 0.3 weight percent of the total weight; and the balance is oil field injection water. The foaming agent has good foaming tendency, can reduce the interfacial tension of oil and water to the lowest under the condition of not adding alkali, and can give full play to the foam flooding and the improvement of conformance factor and displacement efficiency. On the basis of the foaming agent, when the gas liquid ratio is between 0.1:1 and 0.3:1 (volume ratio), the generated foam can improve the recovery ratio by over 10 percent, and the technology with low cost and good effect for improving the recovery ratio of the heavy oil reservoir is realized.

The invention relates to a method of displacing oil by anionic-cationic composite surfactant and mainly solves the problems that the prior method of displacing oil by surfactant is low in oil displacement efficiency in tertiary oil recovery and an oil displacement system containing inorganic base is harmful to stratums and oil wells, corrosive to equipment and pipelines and difficult for demulsification. According to the technical scheme, crude oil is allowed to contact with oil-displacing agent, and the oil-displacing agent comprises, by weight percent, 0.01-5.0% of anionic-cationic composite surfactant, 0.01-3.0% of polymer, and 92.0-99.98% of injected water. The problems are solved well. The method is applicable to tertiary oil recovery for oil fields.

The invention relates to a flooding system used for improving the recovery factor after polymer flooding and a preparation method thereof, which belongs to the technical field of enhanced recovery of oil fields. A surfactant with unlike charges and a polymer react with each other to produce a high-activity compound; and the high-activity compound is mixed with a non-ionic surfactant to produce the novel flooding system. The novel flooding system solves the problems of the poor temperature resistance and the inorganic high valence cation resistance of the prior flooding system. The novel flooding system has the advantages of high viscocity, ultra-low interfacial tension, low feeding quantity and so on. The system has wide application prospects in oil fields to apply the technology for improving the oil recovery factor.

This invention provides a method for preparing crude oil demulsification agent for crude oil pretreatment in refinery plant. Said multi-functional demulsification agent has betaine structure, being of amphoteric-ion surfactant. Organic amine is used as initiator, and epoxy propane and epoxy ethane are polymerized to produce polyether, then reacting with alpha-halogenated carboxylic acid to produce said betaine structure product. This produced has advantages of: excellent emulsification ability and dewater ability, on the molecule there are quaternary amido and carboxy group, so having excellent wetting function, and having good complexation stability to alkaline earth metals in crude-oil, being of calcium-disperser, and having excellent function for removing magnesium and iron.

The invention discloses a pH (potential of hydrogen) responsive metal organic framework nanometer crystal, a preparation method and application. The pH responsive metal organic framework nanometer crystal comprises a metal organic framework and a pH responsive segment, wherein the pH responsive segment is graftedadhered to an organic ligand of the metal organic framework, and can be a pH responsive polymer, a chain segment containing a carboxylic group, or a chain segment containing a pyridine group. The pH responsive metal organic framework nanometer crystal has the advantages that the pH responsive segment is grafted onto the organic ligand of the metal organic framework, so that the contact angle of the metal organic framework is changed, namely that the hydrophilicity and hydrophobicity properties of the metal organic framework are changed, thereby increasing the interface activity of the pH responsive metal organic framework; the pH responsive segment has response property to the change of the pH value of the surrounding environment, the pH responsive metal organic framework has different hydrophilicity and hydrophobicity properties under different pH values, and then the pH responsive metal organic framework can be separated and recycled by adjusting the pH value.

The invention relates to an oil displacement composition used for low permeability oil reservoirs, and a preparation method thereof, and mainly solves the problems of easy stratum obstruction and difficult injection in the low permeability oil reservoir oil displacement process of present composite flooding polymers. The oil displacement composition contains a long carbon chain betaine surfactant and an inorganic salt, wherein the long carbon chain betaine surfactant is anyone selected from long chain carboxylic acid betaine and sulfonic acid betaine, the carbon chain is a C14-C40 alkyl or alkenyl group, the inorganic salt is anyone of or a composition of CaCl2, MgCl2, NaCl and NaHCO3, and a mass ratio of the long carbon chain betaine surfactant to the inorganic salt is 1:(1-100). The oil displacement composition has the advantages of formation of oil-water ultralow interface tension, decompression and augmented injection, and simple system, well solves the problems, and can be used in the intensified oil production process of the low permeability oil reservoirs.

The invention provides a non-alkali composite flooding compound, comprising the following components in percentage by weight: 0.005-0.30% of straight-chain fatty alcohol ether carboxylic betaine amphoteric surfactant, 0.05-0.25% of polymer, and the balance of oilfield injected clear water or return water. According to the invention, the straight-chain fatty alcohol ether carboxylic betaine amphoteric surfactant is used as the essential component of the non-alkali composite flooding compound, to form surfactant/polymer binary system which can reach ultra interfacial tension range with middle-low-temperature middle-low-salt oil deposit and high-temperature high-salt oil deposit, in this way, the requirements on non-alkali composite oil flooding are satisfied.

The invention relates to an active water oil displacement method used for low permeability reservoirs, in particular to a strengthened oil displacement method, and mainly solves the problem of low efficiency of oil displacement of the low permeability reservoirs in the prior art. According to the oil displacement method, a positive-negative system surfactant containing a 0.01-1.0wt% anionic-nonionic surfactant and a cationic surfactant in a molar ratio of 1:0.01-0.99 is injected into a water solution to form active water, dehydrated crude is enabled to be in contact with the active water under the condition of injected water at the oil displacement temperature of 40-100 DEG C with total mineralization (total dissolved solid) TDS more than 200mg/L, and crude in the core is displaced sufficiently. The problem is well solved, and the strengthened oil displacement method can be applied to tertiary recovery production of the low permeability reservoirs.

A method and device for producing a minus-ion air similar to a heated compressed hot air stream, electromagnetic waves in the far-infrared and submilimeter region (hereinafter referred to as ''terahertz wave'') by regulating the discharge pressure and the discharge temperature. The device is excellent in versatility, small in size, and low in cost. An object processed by using the method and device, a processing method, and a processing apparatus are also provided. Air is sent from a blower or an air compressor (2) through an air pipe (8) to a heated compressed air regulator (vessel (3)). The air sealed in the heated compressed airregulator (1) regulated under a predetermined discharge pressure (for example, 30 kPa to 150 kPa) and at a temperature (40 DEG C to 250 DEG C) is passed through a through hole (4A) of a circular plate (4) to produce a heated compressed air. In the produced hot air stream, a resonance electromagnetic wave resonating with the natural frequency of the water molecule is generated by a terahertz wave and a generated thermal shock wave, thereby the hydrogen bond of the water molecules in the air is cut, and electrons are released from hydrogen atoms, thus also producing a minus-ion air stream. A processed object, a processing method, and a processing apparatus are so constituted that the produced hot air stream is used for drying, production of a functional water by exposing water to the hot air stream, production of an aqueous fuel, beauty/health appliances, air/water quality improvement devices, combustion efficiency enhancement devices for internal combustion engines, and so forth.

The invention provides a composite flooding system containing a lipopeptide biological surfactant. The composite flooding system comprises the following components: 6 to 120 mg/L of lipopeptide biological surfactant, 0.01 to 0.30 w/v percent of heavy alkylbenzene sulfonate, and 0.5 to 5 w/v percent of alkali. The lipopeptide biological surfactant is introduced into the conventional composite system, so that the consumption of the alkali and the heavy alkylbenzene sulfonate is obviously reduced, the interfacial activity of the system is further enhanced at the same time, the activity range of the system is further enlarged, and the system is controlled and applied more easily.

The invention relates to a polymer microemulsion system for deep profile control of an oil reservoir and a preparation method thereof. The objective of the invention is mainly to overcome the problems that the usage amount of conventional emulsifiers in reversed-phase microemulsion polymerization in the prior art are great and final oil displacement effect is influenced. The polymer microemulsion system for deep profile control of the oil reservoir is prepared through polymerization of reversed-phase microemulsion under the action of a redox composite initiator. The reversed-phase microemulsion comprises, by weight, 50 parts of an oil-soluble solvent, 3 to 20 parts of an emulsifier, 10 to 70 parts of acrylamide monomers, 0.5 to 20 parts of heatproof salt-resistant monomers and 10 to 60 parts of water. With such a technical scheme, the above problems are overcome, and the prepared polymer microemulsion system can be directly diluted with water to obtain an aqueous solution with a desired concentration and be applied to tertiary oil recovery of an oil field.

The invention provides a nanometer silicon dioxide modified sulfonate oil-displacing agent and a preparation method thereof, which belong to synthesis of a chemical oil-displacing agent in tertiary recovery by a simple and convenient and easily industrialized method. The method comprises the following steps that: firstly, naphthene base crude oil is sulfonated and neutralized at a temperature of between 10 and 80 DEG C to obtain sulfonate; secondly, the sulfonate is subjected to graft modification by nano-grade silicon dioxide; and finally, the nanometer modified sulfonate oil-displacing agent is obtained. The nanometer silicon dioxide modified sulfonate oil-displacing agent comprises 60 to 90 portions of naphthene base sulfonate and 10 to 40 portions of nanometer silicon dioxide by mass portion. The oil-displacing agent can be used for an oil-displacing experiment; when mass fraction of dosage of the oil-displacing agent is 0.3, the oil-displacing agent can reduce the tensile force of oil-water boundary to 5*10mN.m to effectively reduce adhesive force of residual oil, so that the residual oil is easy to deform and separate; meanwhile, the capillary resistance is reduced, so that the residual oil drop is easy to aggregate to form an oil wall and the oil recovery efficiency is improved. The oil-displacing agent has low price, simple synthesis process and convenient popularization and application.

The invention relates to an oil-displacement surfactant composition, a preparation method and application, and mainly solves the problems that conventional surfactants are bad in oil displacement efficiency in the process of tertiary oil recovery, and an oil displacement system damages stratums and oil wells, corrodes equipment and pipelines and cause demulsification difficulty because of a contained inorganic base. The employed oil-displacement surfactant composition comprises a cationic surfactant and an anionic-nonionic surfactant with the molar ratio of 1:0.01-1:100, wherein the anionic surfactant is at least one selected from quaternary ammonium salts or quaternary amine bases, and the anionic-nonionic surfactant has the molecular general formula shown in the specification, and the in general formula, M is any one of alkali metals, alkali earth metals and ammonium radical. The technical scheme relatively well solves the above problems, and is applicable to an enhanced oil recovery process of oil fields.

Embodiments of the present invention relate to the removal of contaminants from water using sugar based surfactant enhanced ultrafiltration.

Embodiments of the present invention are directed to a process for removal of an at least slightly water-soluble organic compound from an organic-contaminated water solution to provide a purified water solution, including: adding a surfactant to the organic-contaminated water solution in sufficient quantity to achieve at least a critical micellar concentration of the surfactant in the organic-contaminated water solution, wherein the surfactant comprises an alkylglycoside, to provide a micellar water solution comprising micelles comprising the surfactant and the organic compound; contacting an ultrafiltration membrane with the micellar water solution under pressure and temperature conditions sufficient for liquid flow through the ultrafiltration membrane to take place; and collecting liquid permeating the ultrafiltration membrane to provide the purified water solution.

The invention relates to an anionic-cationic-nonionic surfactant which is substantially represented by a following formula (I) shown in the description, a preparation method therefor and an application of the anionic-cationic-nonionic surfactant. The anionic-cationic-nonionic surfactant disclosed by the invention shows remarkably-improved interfacial activity and stability compared with surfactants in the prior art. By using the anionic-cationic-nonionic surfactant disclosed by the invention, an oil displacement composition for tertiary oil recovery, which has improved oil displacement efficiency and oil washing capability compared with oil displacement compositions in the prior art, can be prepared. The formula (I) is as shown in the description, wherein each group is as defined in the description.

The invention relates to a preparation method and application of a magnetic demulsifier capable of simultaneously achieving efficient oil-water separation of O/W and W/O emulsions. According to the method, alkyl silane and amino silane are anchored on the surfaces of Fe3O4@SiO2 magnetic nanoparticles through a hydrolytic condensation reaction, so that the magnetic particles are endowed with excellent interfacial activity and cationic characteristics. The magnetic particles modified with the alkyl siloxane and the amino siloxane can be uniformly dispersed in a water phase or an oil phase; afterbeing added into an emulsified oil-water system, the modified magnetic particles can be efficiently adsorbed to an oil-water interface under the driving of interfacial activity and electrostatic attraction, emulsified oil drops or water drops are quickly separated under the action of a magnetic field, and finally, efficient oil-water separation in O/W and W/O emulsions can be realized at the sametime. The obtained magnetic nano material is excellent in demulsification efficiency, and has a very wide application prospect in the field of oil-water separation of O/W and W/O emulsions.

The invention discloses a preparation method for a magnetic carbon nanotube demulsifier. The preparation method comprises the following steps: (1) subjecting carbon nanotubes and mixed acid to a refluxing reaction, so as to obtain oxidation modified carbon nanotubes; (2) preparing a Fe3O4 precursor solution; and (3) uniformly mixing the oxidation modified carbon nanotubes with the Fe3O4 precursorsolution, and carrying out a reaction at a temperature of 180 DEG C to 220 DEG C, thereby preparing the magnetic carbon nanotube demulsifier. According to the preparation method provided by the invention, firstly, the carbon nanotubes are subjected to oxidation modification through the mixed acid to introduce a large number of carboxyl groups and hydroxyl groups to defects and edges of the carbonnanotubes, and then, Fe3O4 nanoparticles are prepared in situ by utilizing a hydrothermal method to modify the oxidation modified carbon nanotubes; the preparation method is simple and is easy to implement; and the prepared magnetic carbon nanotube demulsifier can be used for rapidly achieving oil-water separation of oily wastewater and is relatively good in demulsification effect. A technical scheme of the invention further provides an application of the magnetic carbon nanotube demulsifier in the oily wastewater.

The invention relates to a surfactant composition for chemical displacement of reservoir oil and a preparation method thereof, mainly for solving the problems that the conventional surfactant is poor in oil displacement efficiency in the tertiary oil recovery process and an oil displacement system containing inorganic base damages stratums and oil wells, corrodes equipment and pipelines and results in difficult demulsification. The surfactant composition provided by the invention comprises a cationic surfactant and an anionic-nonionic surfactant, wherein the cationic surfactant is at least one of quaternary ammonium salt and quaternary ammonium alkali; the anionic-nonionic surfactant is a surfactant containing an ethyoxyl nonionic group and a carboxyl or sulfonic acid group anionic group; and the molar ratio of the cationic surfactant to the anionic-nonionic surfactant is (1:0.01)-(1:100); and by the adoption of the surfactant composition and the preparation method of the surfactant composition, the above problems can be well solved. The surfactant composition can be applied to tertiary oil recovery process of an oil field.

The invention relates to a surface rust preventing treatment process for iron art products and provides a novel spraying line production technique. The surface rust preventing treatment process is characterized in that traditional phosphating is replaced by ceramic treatment on a spraying flow production line, common urban tap water is replaced by small cluster water with activity in each washing link during spraying, and common water base degreasing fluid is replaced by small cluster water base degreasing fluid. Compared with traditional phosphating, the method uses non-phosphorus ceramic treatment for pretreatment in prior to nano spaying, and accordingly adhesive force between coating and metal can be increased evidently, and corrosion-resistant time of metal can be prolonged.