43results about How to "Decrease work of adhesion" patented technology

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 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.

The invention relates to a surfactant combination for enhancing oil recovery and a preparation method thereof, and mainly solves the problem of low oil displacement efficiency in the tertiary recovery process in the existing surfactants and the problem of damage to stratums and oil wells, corrosion of equipment and pipes and difficulty in demulsification because inorganic base is contained in oil displacement systems. The surfactant combination comprises a cationic surfactant and an anionic-nonionic surfactant, wherein the cationic surfactant is selected from any one of quaternary ammonium salt and quaternary ammonium alkali; the anionic-nonionic surfactant is a surfactant containing ethoxy nonionic groups and carboxyl or sulfo anionic groups; the mol ratio of the cationic surfactant to the anionic-nonionic surfactant is (1:0.01) to (1:100). The surfactant combination and the preparation method thereof preferably solve the problems, and can be applied to the tertiary recovery process of oil fields.

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.

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 efficient surfactant composition for oil displacement and a preparation method of the composition and mainly solves the problems that existing surfactants have poor oil displacement efficiency in the tertiary oil recovery process, an oil displacement system damages strata and oil wells, corrodes equipment and pipelines and demulsification is difficult because of inorganicbase contained in the oil displacement system. The efficient surfactant composition for oil displacement comprises a cationic surfactant and an anion-non-ionic surfactant, wherein the cationic surfactant is selected from any one of quaternary ammonium salt and quaternary amine alkali, the anion-non-ionic surfactant is a surfactant containing ethyoxyl nonionic groups and carboxyl or sulfonyl anionic groups, and the mole ratio of the cationic surfactant to the anion-non-ionic surfactant is (1:0.01)-(1:100). By means of the technical scheme of the preparation method, the problem is better solved,and the efficient surfactant composition can be used for the tertiary oil recovery process of the oil field.

The present invention discloses an environmental-protection lubricating water-based cutting fluid, which comprises the following raw materials by weight: 8-20 parts of sodium abietate, 15-25 parts of a rosin amine glucose ester surfactant, 5-10 parts of rosin amine polyoxyethylene ether, 12-18 parts of a polyaniline aqueous anti-corrosion agent, 5-15 parts of triethanolamine oleate, 3-8 parts of triethanolamine, 3-10 parts of diisopropanolamine, 10-15 parts of sodium carbonate, 5-15 parts of hydrophilic alcohol, 3-6 parts of a sterilization agent, 2-5 parts of a foaming agent, 3-10 parts of a stabilizer, and 80-100 parts of water. The environmental-protection lubricating water-based cutting fluid has functions of excellent cleaning, excellent lubrication, excellent corrosion resistance and excellent cooling, and further has characteristics of environmental protection, long service life, good water solubility, low cost, and high stability.

The invention discloses an oil bubble-based column flotation device and method. The device mainly comprises an oil chamber, a sintered plate, a flange, a main path inlet pipe, branch inlet pipes, a circulating pump, an air bubble generator and an overflow groove. The device is characterized in that the oil chamber is arranged at the bottom of a column body of the column flotation device; the oil chamber is separated from ore pulp of a flotation segment through the sintered plate fixed in the middle of the flange; an air inlet is connected with the main path inlet pipe through a pipe; the main path inlet pipe is arranged in a circle around the column body of a flotation column and connected with six branch inlet pipes; the six branch inlet pipes are uniformly arranged on the periphery of the bottom of the oil chamber; and an air outlet of each branch inlet pipe penetrates into the oil chamber for a proper length to ensure uniform distribution of the gas in the oil chamber. Separation of middings coal is strengthened by rotational flow formed by the circulating pump, suspension of mineral grains in the ore pulp is ensured, and the advantage conditions are created for implementation of mineralization of coal grains and oil bubbles.

The invention provides a nanometer emulsion oil-displacing agent and a preparation method thereof. The nanometer emulsion oil-displacing agent provided by the invention comprises the following ingredients in parts by weight: 30-45 parts of mineral oil, 3-8 parts of an emulsifier, 30-50 parts of monomer alkaline and water mixed liquor, 0.01-0.5 part of a cross-linking agent, 0.05-0.5 part of an oxidizing agent and 0.04-0.7 part of a reductant. According to the nanometer emulsion oil-displacing agent, raw materials are mixed and stirred orderly to form the emulsion of a water in oil system. Themolecular weight of the prepared nanometer emulsion oil-displacing agent is greater than 2000 thousands, a grain size in a particle is less than 40nm, interfacial tension is 9.0*10<-5>-8.6*10<-4> / m, astable storage period is greater than 240 days, and layering is unlikely to happen. The nanometer emulsion oil-displacing agent can reach any corner communicated with an oil deposit, rock surface wettability is changed, and swept volume is improved so as to be favorable for peeling and harvesting crude oil.

The invention relates to a surfactant composition for tertiary oil recovery and a preparation method thereof, mainly for solving the problems that the existing surfactant has poor oil displacement efficiency in tertiary oil recovery, inorganic base contained in a displacement of reservoir oil system damages the stratum and oil wells, corrodes equipment and pipelines, and results in difficult emulsion breaking. The surfactant composition comprises a cationic surfactant and an anion-nonionic surfactant, wherein the cationic surfactant is any one of quaternary ammonium salt and quaternary amine alkali, the anion-nonionic surfactant contains ethyoxyl nonionic group and carboxyl or sulfonic acid group anionic group, and the molar ratio of the cationic surfactant to the anion-nonionic surfactant is 1:0.01-1:100. Due to adoption of the surfactant composition and the preparation method, the above problems can be well solved. The technical scheme can be used in the oil field tertiary oil production process.

The invention relates to a compound surfactant composition and an application. The composition mainly solves the problem of low efficiency of reservoir oil displacement in tertiary oil recovery process of oil reservoir with hypersalinity due to surfactants. The compound surfactant composition comprises an anionic surfactant and a cationic surfactant, the mol ratio of the anionic surfactant and the cationic surfactant is 1:(0.01-100), wherein the cationic surfactant is selected from at least one of quarternary ammonium compounds, and the anionic surfactant is expressed by a molecular general formula shown in a formula (I); M1 and M2 are independently selected from any one of ammonium ion or alkali metal ion, and R is anyone of H, C1-C10 fatty group or aromatic base. The technical scheme better solves the problem and can be applied to tertiary oil recovery process of oil reservoir with hypersalinity.

The invention discloses a microemulsion flooding system prepared by taking swill oil as a raw material. The flooding system is prepared from swill oil pretreatment fluid, and anionic, non-ionic or composite surface active agent of which HLB value is less than 6. The microemulsion flooding system has the beneficial effects that the raw materials are emulsified to form oil-coating-water type emulsion, and its emulsion droplet size is designed according to the hole size of the injection oil deposit. The generally designed droplet size is more than that of a pore throat, thus the emulsion can effectively block the pore throat and generate a Jamin effect, thus the subsequent fluid is changed, and the volume is further enlarged. Meanwhile, it is the oil-coating-water type emulsion, the emulsiongenerates big flow resistance in the face with water, and has small flow resistance change in the face with oil, thus the microemulsion flooding system plays the effects of selective water blocking and flooding since only water is blocked. Therefore, the flooding system can selectively block water and recycle the swill oil.

The invention relates to the technical field of oil and gas exploitation, in particular to preparation of a nanometer microemulsion and application of the nanometer microemulsion in improving the gasproduction rate of a gas field. The nanometer microemulsion comprises the following components: 35 to 55 parts of an oil-based solvent, 20 to 40 parts of a water-soluble monomer, 5 to 10 parts of a cationic surfactant, 3 to 6 parts of an anionic-nonionic surfactant, 1 to 4 parts of a lipophilic emulsifier, 0.5 to 1.5 parts of a hydrophilic emulsifier and 0.3 to 0.8 part of a surface active synergist. The preparation method comprises the steps of oil phase preparation, water phase preparation, an oil phase-water phase mixed reaction and the like. The nanometer microemulsion can form ultralow interfacial tension with oil gas, so cohesion between the oil gas is effectively overcome, outflow of the oil gas is facilitated, and the gas production rate of a gas field is greatly increased; in addition, the microemulsion is not prone to adsorption and elution in the exploitation process of the gas field, surface activity loss is low, and therefore, oil gas production cost is reduced.

The invention relates to a crude oil surface active agent as well as a preparation method and an application thereof. The crude oil surface active agent comprises the following components in percentage by weight under an alkali-free condition: 1%-2% of fatty acid diethanol amide, 5%-10% of polyoxyethylene fatty acid amide, 10%-20% of heptadecyl dimethyl betaine and the balance of water, wherein the compounding weight ratio of the polyoxyethylene fatty acid amide to the heptadecyl dimethyl betaine is 1:2. A surface active agent compound system can form the ultra-low interfacial tension of 10<-3>-10<-4> mN / m with stratum dewatered crude oil at 45 DEG C when the use concentration is 0.0075%-0.01% under the alkali-free condition. In addition, the surface active agent compound system is less influenced by stratum water salinity, achieves the adsorption quantity on three oil sands of in the Liaohe oilfield Hainan less than 0.5 mg / g, is suitable for a mono-system flooding or binary system flooding technology adopted in the middle and later period of the waterflooding development of an oil deposit and provides certain technical support for the tertiary oil recovery of an oilfield.

The invention relates to a surface active agent composition for chemical displacement of reservoir oil, and a preparation method and application thereof, and mainly solves the problems of poor displacement efficiency in a tertiary oil recovery process, and harm to the stratum and the oil field, corrosion of equipment and pipeline and difficult demulsification due to oil inorganic alkali contained in displacement system. The invention adopts the surface active agent composition comprising a cationic surface active agent and an anionic-non-ionic surface active agent. The cationic surface active agent is at least one selected from the group consisting of quaternary ammonium salt or quaternary ammonium alkali; and the anionic-non-ionic surface active agent is represented by a molecular general formula shown as (A) or (B), wherein M represents one of an alkali metal, an alkaline earth metal and ammonium, m and n are selected from 0-14, and x and y are selected from 0-100. The technical scheme well solves the above problems, and can be used in tertiary oil recovery process.

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 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 provides a nano pressure-reducing injection-increasing oil-displacing viscosity-reducing integrated agent, a preparation method and application thereof. The integrated agent comprises the following raw materials in percentage by weight: 5.0%-10.0% of an oil-soluble comb polymer, 5.0%-10.0% of triethylene tetramine hexaacetic acid, 8.0%-10.0% of diethylene triamine pentamethylene phosphoric acid, 8.0%-10.0% of monoethanolamine, 5.0%-10.0% of cocamidopropyl hydroxysulfonic acid betaine, 20.0%-25.0% of xylene, 3.0%-5.0% of dioctadecyl dimethyl ammonium chloride, 10.0%-15.0% of nonylphenol polyoxyethylene ether TX-15, 15.0%-20.0% of methyl alcohol and the balance water. The invention also provides a preparation method of the integrated agent. According to the invention, the nano pressure-reducing injection-increasing oil-displacing viscosity-reducing integrated agent is used as a water injection well additive, the oil-water interfacial tension can be effectively reduced to 10<-3> mN / m level by adding 0.1-0.3% of the nano pressure-reducing injection-increasing oil-displacing viscosity-reducing integrated agent, formation blockage caused by barium strontium sulfate and organic scale in the formation can be effectively eliminated, crude oil viscosity and condensation point can be effectively reduced.

The invention relates to a branched alkyl substituted silanized aromatic hydrocarbon self-assembled lubricating thin film and a preparation method thereof, and belongs to the technical field of preparation of lubricants. The lubricating thin film is a branched alkyl substituted silanized aromatic hydrocarbon self-assembled lubricating film obtained by performing Friedel-Crafts reaction on phenyltrimethoxysilane and 1-bromo-2-octyldodecane. The lubricating thin film is bonded with a monocrystalline silicon substrate in a covalent bond form, thereby achieving excellent adhesion; a group connected with the monocrystalline silicon substrate has a rigid benzene ring structure, which can enhance the strength when being subjected to friction; flexible long-chain alkyl is connected on a benzene ring, and has a good antifriction effect; the lubricating film can effectively reduce the friction coefficient of the surface of a miniature monocrystalline silicon device, and has potential applicationvalue in the fields of space micro-machinery and information technology.

The invention relates to a surfactant combination for enhancing oil recovery and a preparation method thereof, and mainly solves the problem of low oil displacement efficiency in the tertiary recovery process in the existing surfactants and the problem of damage to stratums and oil wells, corrosion of equipment and pipes and difficulty in demulsification because inorganic base is contained in oil displacement systems. The surfactant combination comprises a cationic surfactant and an anionic-nonionic surfactant, wherein the cationic surfactant is selected from any one of quaternary ammonium salt and quaternary ammonium alkali; the anionic-nonionic surfactant is a surfactant containing ethoxy nonionic groups and carboxyl or sulfo anionic groups; the mol ratio of the cationic surfactant to the anionic-nonionic surfactant is (1:0.01) to (1:100). The surfactant combination and the preparation method thereof preferably solve the problems, and can be applied to the tertiary recovery process of oil fields.

The invention relates to a surfactant composition and a preparation method thereof, which mainly solve the problems that the oil displacement efficiency of the existing surfactant is low in the tertiary oil recovery process and damage to strata and oil wells, corrosion to equipment and pipelines and difficulty in demulsification occur because an oil displacement system contains inorganic alkali. According to the technical scheme of the invention, the surfactant composition comprises cationic surfactant and anionic-nonionic surfactant, wherein the cationic surfactant is at least one selected from quaternary ammonium salt or quaternary amine alkali, the anionic-nonionic surfactant is at least one selected from alkanolamide polyoxy ethylene / propylene ether carboxylate or alkanolamide polyoxy ethylene / propylene ether sulfonate, and the mol ratio of the cationic surfactant to the anionic-nonionic surfactant is (1:0.01)-(1:100). The invention also provides a preparation method of the surfactant composition. Thus, the problems are well solved; and the invention can be used for the forced oil recovery process of oil fields.

The invention provides a nano-scale pressure-reducing, injection-flooding, oil displacement and viscosity-reducing integrated agent and its preparation method and application. The raw material composition of the integrated agent includes: 5.0%-10.0% oil-soluble comb polymer, 5.0%-10.0% Triethylenetetraminehexaacetic acid, 8.0%‑10.0% dihexyltriaminepentamethylene phosphate, 8.0%‑10.0% monoethanolamine, 5.0%‑10.0% cocamidopropyl mesylate beet Alkali, 20.0%‑25.0% xylene, 3.0%‑5.0% dioctadecyldimethylammonium chloride, 10.0%‑15.0% nonylphenol ethoxylate TX‑15, 15.0%‑20.0 % of methanol and the balance of water. The present invention also provides a preparation method of the above-mentioned integrated agent. The nano-scale pressure-reducing, increasing-injection, oil-flooding and viscosity-reducing integrated agent of the present invention is used as an additive for water injection wells, and the dosage is 0.1%-0.3%, which can effectively reduce the oil-water interfacial tension to 10 ‑3 At mN / m level, it can effectively eliminate formation clogging caused by barium, strontium sulfate and organic scale in the formation, and at the same time, it can effectively reduce the viscosity and freezing point of crude oil by more than 60%, and effectively improve the production efficiency of oil wells.

The invention relates to a composite surfactant composition as well as a preparation method thereof, and mainly solves the problems that an existing surfactant is poor in oil driving efficiency during three times of oil extraction processes, meanwhile, an oil driving system contains inorganic alkaline, hurts the ground layer and an oil well, and corrodes equipment and pipelines, and demulsification is difficult. According to the composition and the preparation method, the surfactant composition comprises a cation surfactant and an anion-non-ion surfactant, wherein the cation surfactant is selected from any one of quaternary ammonium salt and quaternary amine alkali, the anion-non-ion surfactant is a surfactant containing ethoxy nonionic groups and carboxyl or sulfo anionic groups, and the mole ratio of the cation surfactant to the anion-non-ion surfactant is (1:0.01)-(1:100); by using the composition and the preparation method, the problems are solved well, and the composite surfactant composition as well as the preparation method thereof can be used in the process of three times of oil extraction in an oil field.

The invention discloses a steam flooding additive and relates to a chemical additive. The invention provides the steam flood additive and a preparation method thereof. With the adoption of the steam flood additive, the wetting and infiltration capacity of filled water can be effectively improved, water adsorption performance in the reservoir is improved, the sweep capacity of the water displacing oil is improved, a wetting contact angle between the crude oil and the rock is increased, and the rock surface is enabled to change into water wetness from oil wetness, so that adhesion work of the oil drop on the rock surface is reduced, and the steam flooding additive is beneficial for extracting the crude oil, thereby the recovery efficiency is improved. The steam flooding additive comprises the following components in percentage by mass: 65-85% of dimer fatty acid; 10-25% of emulsifier and 5-10% of mutual solvent. The dimer fatty acid, the emulsifier and the mutual solvent are added to a container in turn, then are stirred on a magnetic stirrer, and are mixed to obtain the steam flooding additive. The steam flooding additive is a faint yellow liquid.

The invention relates to a surface active agent composition for chemical displacement of reservoir oil, and a preparation method and application thereof, and mainly solves the problems of poor displacement efficiency in a tertiary oil recovery process, and harm to the stratum and the oil field, corrosion of equipment and pipeline and difficult demulsification due to oil inorganic alkali contained in displacement system. The invention adopts the surface active agent composition comprising a cationic surface active agent and an anionic-non-ionic surface active agent. The cationic surface active agent is at least one selected from the group consisting of quaternary ammonium salt or quaternary ammonium alkali; and the anionic-non-ionic surface active agent is represented by a molecular general formula shown as (A) or (B), wherein M represents one of an alkali metal, an alkaline earth metal and ammonium, m and n are selected from 0-14, and x and y are selected from 0-100. The technical scheme well solves the above problems, and can be used in tertiary oil recovery process.

The invention relates to a branched alkyl substituted silanized aromatic hydrocarbon self-assembled lubricating thin film and a preparation method thereof, and belongs to the technical field of preparation of lubricants. The lubricating thin film is a branched alkyl substituted silanized aromatic hydrocarbon self-assembled lubricating film obtained by performing Friedel-Crafts reaction on phenyltrimethoxysilane and 1-bromo-2-octyldodecane. The lubricating thin film is bonded with a monocrystalline silicon substrate in a covalent bond form, thereby achieving excellent adhesion; a group connected with the monocrystalline silicon substrate has a rigid benzene ring structure, which can enhance the strength when being subjected to friction; flexible long-chain alkyl is connected on a benzene ring, and has a good antifriction effect; the lubricating film can effectively reduce the friction coefficient of the surface of a miniature monocrystalline silicon device, and has potential applicationvalue in the fields of space micro-machinery and information technology.

The invention discloses an amphoteric two-dimensional nanosheet as well as a preparation method and application thereof. The amphoteric two-dimensional nanosheet is prepared through the following steps: evenly dispersing few-layer graphite oxide in methylbenzene, and adding an alkylamine coupling agent into the methylbenzene for a reaction; and then fully dispersing the prepared amido-terminated graphene oxide dispersion in a toluene-dimethylformamide mixed solvent, and then adding alkyl glycidyl ether into the dispersion to react, so as to obtain the amphoteric two-dimensional nanosheet. The amphoteric two-dimensional nanosheet is prepared by modifying two-dimensional graphene oxide, compared with an emulsion composed of a conventional surfactant, the amphoteric two-dimensional nanosheet can spontaneously form a water-in-oil Pickering emulsion at an oil-water interface, effectively stabilize the water flooding front edge and enlarge the water flooding swept volume, the synthesis process is simple and convenient, large-scale production is facilitated, and the amphoteric two-dimensional nanosheet has a wide application range, and is generally suitable for water-flooding exploitation of oil reservoirs.

The invention discloses a steam flooding additive and relates to a chemical additive. The invention provides the steam flood additive and a preparation method thereof. With the adoption of the steam flood additive, the wetting and infiltration capacity of filled water can be effectively improved, water adsorption performance in the reservoir is improved, the sweep capacity of the water displacingoil is improved, a wetting contact angle between the crude oil and the rock is increased, and the rock surface is enabled to change into water wetness from oil wetness, so that adhesion work of the oil drop on the rock surface is reduced, and the steam flooding additive is beneficial for extracting the crude oil, thereby the recovery efficiency is improved. The steam flooding additive comprises the following components in percentage by mass: 65-85% of dimer fatty acid; 10-25% of emulsifier and 5-10% of mutual solvent. The dimer fatty acid, the emulsifier and the mutual solvent are added to a container in turn, then are stirred on a magnetic stirrer, and are mixed to obtain the steam flooding additive. The steam flooding additive is a faint yellow liquid.

The invention relates to a surfactant composition used for tertiary oil recovery and a preparation method thereof, mainly solving a problem of the low oil displacement efficiency of surfactants at present in tertiary oil recovery processes and problems of damage to stratums and oil wells, equipment and pipeline corrosion and difficult demulsification which are caused by inorganic bases in oil displacement systems. According to the technical scheme adopted by the surfactant composition and the preparation method, the surfactant composition comprises a cationic surfactant and an anionic-nonionic surfactant, wherein the cationic surfactant is at least one selected from a quaternary ammonium salt or a quaternary amine alkali, the anionic-nonionic surfactant is at least one of an amidogen ether carboxylate or an amidogen ether sulphonate, and the molar ratio of the cationic surfactant to the anionic-nonionic surfactant is 1:0.01-1:100. By the technical scheme, the problems are solved well and the surfactant composition can be used in enhanced oil recovery of an oil field.

The invention relates to a surfactant composition for intensified oil production and a preparation method thereof, mainly for solving the problems that the existing surfactant has poor oil displacement efficiency in tertiary oil recovery, inorganic base contained in a displacement of reservoir oil system damages the stratum and oil wells, corrodes equipment and pipelines, and results in difficult emulsion breaking. The surfactant composition for intensified oil production comprises a cationic surfactant and an anion-nonionic surfactant, wherein the cationic surfactant is any one of quaternary ammonium salt and quaternary amine alkali, the anion-nonionic surfactant is any one of fatty alcohol polyoxyethylene / polypropylene ether carboxylate and fatty alcohol polyoxyethylene ether / polypropylene ether sulfonate, and the molar ratio of the cationic surfactant to the anion-nonionic surfactant is 1:0.01-1:100. Due to adoption of the surfactant composition and the preparation method, the above problems can be well solved. The techcnial scheme can be used in the oil field intensified oil production process.