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

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 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 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 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 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.