65results about How to "Reduce surface and interfacial tension" patented technology

The invention discloses a fracturing prepad fluid, comprising the following ingredients: 1-10 wt% of biological enzyme, 0.1-1 wt% of clay stabilizing agent, 0.01-0.1 wt% of fluorocarbon surfactant, 0.01-0.5 wt% of wettability reversal agent, 0.01-1 wt% of composite activator, and the balance of water. The fracturing prepad fluid disclosed herein not only overcomes the disadvantages of routine prepad fluids and has the advantage of fracture forming of routine prepad fluids, but also has the effects of peeling off residual oil on the surface of a rock core, cleaning and unblocking oil gas seepage channels, reducing the viscosity of crude oil, changing the wetability of the rock core, reducing the surface and interfacial tension to benefit for flowback, and preventing the clay from expansionand migration, and the like. The more the fracturing prepad fluid enters a reservoir, the larger the spread range is, and the larger the action scopes of the fracturing prepad fluid on cleaning and unblocking of the oil gas seepage channels are. The fracturing prepad fluid is beneficial for increasing the oil gas yield.

The invention discloses a method for preparing a water-based fracturing fluid by using a multi-effect thickener, which is characterized in that the fracturing fluid is composed of a base fluid and a cross-linking fluid containing a gel breaker, and is mixed according to the following parts by weight Uniform: 60-99.99 parts of base liquid, 0.01-40.0 parts of cross-linking liquid containing gel breaker; the base liquid is mixed according to the following parts by weight: 99-99.9 parts of water, multi-effect Thickener is 0.1-1.0 parts; the cross-linking liquid containing breaker is mixed according to the following parts by weight: water is 0-99.9 parts, cross-linking agent is 0.1-100.0 parts and breaker is 0.001- 0.1 part. The water-based fracturing fluid formulated with this multi-effect thickener can meet the requirements of use without adding bactericides, clay stabilizers, surfactants, demulsifiers, and foaming agents. Under the condition that the performance indicators of the fracturing fluid are equivalent to those of the traditional fracturing fluid, the operation process is simplified, which is more conducive to improving the quality of the fluid, reducing the conditions required for monitoring, reducing construction procedures and time applications.

The invention discloses a rubber asphalt high temperature viscosity reducer, a preparation method and an application thereof. The rubber asphalt high temperature viscosity reducer is prepared by raw materials of, by mass, 100 parts of oxidized polyethlene wax, 5-40 parts of higher fatty acid and 10-50 parts of metal hydroxide. The rubber asphalt high temperature viscosity reducer is simple in preparation process, convenient to use and capable of reducing high temperature viscosities of ordinary rubber asphalt and modified rubber asphalt and reducing rubber asphalt intermolecular surface tension so that mixing temperatures of rubber asphalt mixtures are reduced, and purposes of reducing energy consumption and protecting environment are achieved.

The invention discloses a low-damage and ultralow-concentration guar gum fracturing fluid system, a preparation method and an application of the guar gum fracturing fluid system and belongs to the technical field of reservoir reforming for oil-gas field development. In order to solve the problems that the existing conventional fracturing fluid systems hardly give attention to the lowering of concentration of a thickener, the prolonging of crosslinking time, the improving of gel strength and gelout capability and being environmentally friendly, a SITAR-11 powerful delayed crosslinker is selected, so that formed gel is endowed with a relatively high delayed crosslinking effect while heat resistance, shearing resistance and solid carrying capacity for the formed gel are guaranteed, and the concentration of the thickener is greatly lowered; and on one hand, the reduction of cost and the increase of economic benefit are facilitated, and on the other hand, the amount of gelout residues is reduced after the concentration of the thickener is lowered. Further, FANTA-05 and FANTA-06fracturing gelout enzymes, which are thorough in gelout and controllable in gelout time, and a ZITHE-34 efficient discharge aiding agent are added in a matched manner, so that the fracturing fluid system, which has a delayed crosslinking effect, is high in heat resistance and salt tolerance, excellent in solid carrying behavior, controllable in gelout time and thorough in gelout and is green, environmentally friendly and efficient, can be formed.

The invention belongs to the field of oil field fracturing fluid, and particularly relates to an alcohol-containing fracturing fluid and a preparation method and application thereof. The alcohol-containing fracturing fluid comprises ethanol, ethylene glycol, water, a thickening agent and a cross-linking agent. By adding ethanol, the phenomenon that part of properties become poor due to addition ofethylene glycol into the fracturing fluid can be improved, and along with increasing of the content of ethanol, the viscosity of the ethanol-ethylene glycol-water mixed solvent fracturing fluid is increased, the temperature resistance is good, the sand carrying capacity is enhanced, the viscosity of the gel breaking fluid is reduced, and the content of residues is reduced.

According to the acid-resistant resistance reducing agent, the preparation method of the acid-resistant resistance reducing agent and the acid-resistant slickwater water fracturing fluid system. A hydrophobic monomer is introduced into the molecular structure, so that the system has good rheological and gel breaking performance in an aqueous solution, the technological requirements of long-crack and high-sand-ratio construction can be met, and the fracturing fluid has good temperature resistance under the acid condition; moreover, the thickening agent has a rapid dissolving property in an acidsolution, and can meet the technological requirements of industrial operation construction. The acid-resistant slickwater fracturing fluid system prepared from the acid-resistant resistance reducingagent is completely degraded at the reservoir temperature, damage to a reservoir is reduced, the fracturing fluid system has low surface and interface tension and residue content, rock core permeability damage is low, and good reservoir adaptability is shown.

There is herein described a film and a method of using a film for tooth remineralisation. More particularly, there is described a film comprising a bioactive glass and a water soluble polymer and a method of using such a film for tooth remineralisation.

The invention discloses an alcohol-soluble slickwater system for fracturing as well as a preparation method and application of the alcohol-soluble slickwater system, and relates to the technical fieldof acid fracturing agents. The slickwater system is composed of the following components in percentage by weight: 20.0-60.0% of a polyacrylamide polymer, 0.5-4.0% of nano particles, 0.1-3% of a surfactant, and the balance of organic alcohol.

The invention relates to a cross-linking agent able to crosslink hydrophobic modified hydroxypropyl guar and a preparation method thereof. Presently at home and abroad, water-based fracturing liquids are more likely to be employed in fracturing of most reservoirs, and the practice has the following disadvantages that: (1) a fracturing liquid system with routine guar gum as the densifier is only suitable for intermediate and low temperature stratums, so that a limitation exists for high temperature wells with a temperature over 150DEG C; (2) generally, fracturing liquids needs more additives, thus causing damage to stratums to a certain degree. The cross-linking agent of the invention comprises by weight: 150-200 parts of water, 140-160 parts of glycol, 60-70 parts of boric acid, 60-80 parts of zirconium oxychloride, 180-200 parts of acetic acid, 20-240 parts of monoethanolamine, and 50-180 parts of sodium hydroxide. In an enclosed container, the final product can be produced. The cross-linking agent of the invention can form a fracturing liquid with a densifier, and the formed fracturing liquid can resist a temperature higher than 150DEG C. The cross-linking agent and the densifier fracturing liquid system in the invention have the characteristic of low interfacial tension.

The invention relates to a biological enzyme composite blocking remover and a preparation method thereof, which belong to the technical field of oil field yield increase renovation. The blocking remover comprises the following components by mass: 0.1-0.5% of biological enzyme, 3-5% of a biological surfactant, 5-10% of a biological enzyme stabilizer, and the balance of water; the biological enzyme comprises at least one of xylanase, lipase, cellulase, mannase, protein complex enzyme, amylase and xanthan gum lyase; the biological surfactant is prepared from at least one of the following components: the biological surfactant is mainly prepared from rhamnolipid, sophorolipid and N-acetylgalactosamine; and the biological enzyme stabilizer comprises at least one of the following components: disodium ethylene diamine tetraacetate, citric acid and triethanolamine. The biological enzyme composite blocking remover provided by the invention can solve the problems of permeability reduction and the like caused by low-permeability and medium-low-permeability reservoir reconstruction residual gum and organic matter (wax, asphaltene and the like) blocking in the later development period.

The invention discloses a formula and a preparation method of a low-pressure gas field old well re-production liquid locking removal treatment agent. The low-pressure gas field old well re-productionliquid locking removal treatment agent comprises the following components by weight: 0.1-0.4% of a surface treatment agent, 0.05-0.3% of a nanometer material, 3-8% of a dispersant, 10-18% of a cleaning agent, 18-32% of a mutual solvent, 2-12% of a wetting reversal agent, and the balance industrial tap water. The treating agent can reduce liquid surface tension and oil-water interfacial tension ofa near wellbore area, reduce capillary resistance of a liquid, improve the contact angle of the liquid and rock and change rock surface wettability, and the effective period of the treated rock surface is prolonged through the dual adsorption effect of a nano material and a surfactant.

The invention relates to the field of oil and gas field fracturing liquid additive preparation, and discloses a discharge aiding agent for fracture acidizing, a manufacturing of the discharge aiding agent and a use method of the discharge aiding agent, and aims at solving the technical problem of environment pollution of the discharge aiding agent in the prior art. The discharge aiding agent is prepared from 8 percent to 12 percent of alkyl polyglucosides, 2 percent to 4 percent of fatty amine polyoxyethylene ether and the balance water through be metered in percentage by mass. The main ingredients of the discharge aiding agent are all green degradable substances, so that the technical effect of reducing the environment pollution is achieved.

The invention provides a salt-resistant and shear-resistant polymer surfactant for profile control and flooding, and a preparation method thereof, wherein the surfactant comprises, by mass, 75-88 parts of a copolymerization type polyacrylamide resin, 1-6 parts of a gemini quaternary ammonium salt active agent, 2-4.5 parts of a polyoxyethylene copolymerization resin, 2-10 parts of an organic sulfonate active agent system, 2.5-4.2 parts of an anion-cation phase transfer agent, 4-8 parts of a filling agent, 0.01-0.6 part of a co-initiator and 0.1-1 part of a cross-linking agent. According to theinvention, the salt-resistant and shear-resistant polymer surfactant has characteristics of ultralow interfacial tension, good oil displacement, good salt resistance and good shear resistance, is suitable for profile control and oil displacement of oil reservoirs with different mineralization degrees and medium-high water cut stages, can substantially improve oil reservoir recovery, and further has advantages of storage stability, convenient use and the like.

A composite densifier fracturing fluid is disclosed, and comprises 0.1-0.3% by weight of hydroxypropyl guar gum, 2-4% by weight of modified starch, 0.5-2% by weight of a clay stabilizer, 0.1-0.5% by weight of a temperature stabilizer, 0.1-1% by weight of a cleanup additive, 0.1-0.3% by weight of a bactericide and 0.1-0.3% by weight of a pH adjusting agent, with the balance being water. The modified starch is prepared by subjecting waxy starch to acetylization modification by adopting acetic anhydride, performing phosphorylation modification by adopting sodium trimetaphosphate or phosphorus oxychloride, subjecting the modified product to spray drying, and pre-gelatinizing. Defects in the prior art that contents of water insoluble substances and dregs after gel breaking are high, the cost is high, and the like in conventional guanidine gum fracturing fluid systems are overcome. The composite densifier fracturing fluid which is low in harm and low in cost is prepared.

The invention discloses a compound microorganism oil extraction method for a low permeability oilfield. The compound microorganism oil extraction method comprises the following steps of (1) cultivating pseudomonas aeruginosa YM4 strains and pseudomonas stutzeri DP1 strains in an indoor shaking flask respectively, and obtaining fermentation broth of high-activity pseudomonas aeruginosa YM4 strains and fermentation broth of polymer produced strains through first-stage and second-stage seeding tank amplification and fermentation production of a production tank; (2) mixing surface active agent produced strains and the pseudomonas stutzeri DP1 strains fermented and produced in the step (1) according to volume ratio of 1:1; and (3) enabling compound microorganism bacterium liquid obtained in the step (2) to serve as an oil-displacing agent to inject in an oil layer directly through a water injection well, and obtaining crude oil from a producing well. The YM4 strains and the DP1 strains are both facultative anaerobic microorganisms and can both grow and breed in a ground layer, polymers produced by the DP1 strains can improve mobility ratio, increases water injection affecting area, and the product surface active agent of the YM4 strains can reduce oil-water interfacial tension and improve oil recovery.

The invention relates to an environment-friendly drag reducing agent for fracturing, and a preparation method thereof, wherein the environment-friendly drag reducing agent comprises, by weight, 0.1-17parts of a gemini quaternary ammonium salt, 8-55 parts of fatty alcohol polyoxyethylene ether, 0.4-0.7 part of a polyoxyethylene resin, 1.4-50 parts of sulfonate, 1.4-5.0 parts of a nonionic naturalcarboxylate surfactant, 0.2-2.5 parts of a cloud point inhibitor, 0.5-2.4 parts of an anion-cation phase transfer agent and 5-90 parts of water. According to the invention, the environment-friendly drag reducing agent is non-toxic and harmless to the environment and people, meets the national environmental protection policy, and has advantages of ultralow surface and interface tension, suitabilityfor slickwater hydraulic fracturing, sterilization function, storage stability, convenient use and the like.

The invention discloses a fluorocarbon surfactant as well as a preparation method and application thereof and relates to the technical field of material preparation. The preparation method of the fluorocarbon surfactant comprises the following steps: mixing caustic alkali, amino compounds, 3-perfluorooctyl epoxypropane and a first solvent, and reacting under the temperature condition of 60-90 DEGC for 10-30 hours. Preferably, the reaction temperature is 65-75 DEG C, and the reaction time is 16-24 hours. The preparation method is simple, feasible and convenient for industrialized application.The fluorocarbon surfactant prepared by using the method has the advantages of being high in surface activity, excellent in temperature resistance, excellent in solubility, small in usage amount, mildin synthesis conditions and the like, and the surface tension of an aqueous solution can be effectively reduced. Meanwhile, the fluorocarbon surfactant is capable of effectively reducing the surfaceand interfacial tension of acidizing and fracturing fluid and improving a flowback rate and can be applied to a process of preparing an oilfield acidizing and fracturing assistant.

The invention provides an injection agent for a water injection well and a preparation method and application of the injection agent. The injection agent for the water injection well comprises the following raw material components: 5.0%-10.0% of sulfamic acid, 10.0%-20.0% of methanol, 10.0%-20.0% of tartaric acid, 10.0%-20.0% of ethylenediamine theramethylenephosphonic acid, 5.0%-10.0% of sodium polyacrylate, 5.0%-8.0% of coco-isethionic acid and the balance of water. The invention further provides a preparation method of the injection agent. The injection agent for the water injection well can be used in a construction technology for acidizing of a reservoir, and can be directly used. While dissolving scale, the injection agent further can achieve dilation effect, and the purposes of reducing pressure and increasing yield are achieved finally.

The invention discloses a foam scrubbing agent as well as a preparation method and application thereof. The foam scrubbing agent comprises the following components: an anionic surfactant, a zwitterionic surfactant, a nano active agent material and organic alkali, the nano active agent material is obtained by polymerizing raw materials containing a double-bond modified lamellar nano material, a hydrophilic monomer and a hydrophobic monomer; the hydrophilic monomer is selected from at least one of anhydride compounds; the hydrophobic monomer is selected from at least one of long-chain alkyl allyl quaternary ammonium salts. The foam scrubbing agent contains the nano active agent material and has the effect of reducing surface and interfacial tension, and meanwhile, the nano active agent material can be attached to the surface of foam, so that the stability of the foam is enhanced, the half-life period of the foam is greatly prolonged, and the liquid carrying capacity of the foam scrubbing agent is improved.

The invention relates to a stable vaginal secretion visible component staining solution and a preparation method thereof, and belongs to the technical field of staining solutions. The problems that inthe prior art, dyeing steps are tedious, operation is complex, the dyeing speed is low, the using effect is poor, the cost is high, and the daily film reading amount is small are solved. The stable vaginal secretion visible component staining solution comprises a staining solution A and a staining solution B, wherein the staining solution A comprises an organic solvent and a staining agent, and the staining agent is a red system staining agent, a green system staining agent, a purple system staining agent or a blue system staining agent; and the staining solution B comprises a buffer solution, a preservative, a dyeing assistant, an osmotic pressure regulator and a surfactant. The staining solution is excellent in detected cell morphology, high in accuracy and good in stability, and the validity period can reach 12 months.

The invention relates to a water-based fracturing fluid used for continental face shale gas fracturing and a preparation method thereof. The fracturing fluid comprises 0.02-0.1% of macromolecule polymer, 2-3% of clay stabilizer, 0.3-0.5% of discharge aiding agent, 0.1-0.3% of bactericide and the balance of water in mass percent. The preparation method of the fracturing fluid comprises the following steps of: 1) getting water in proportion in the formula of the fracturing fluid; 2) adding 0.02-0.1% of macromolecule polymer in mass percent, and stirring for 40 minutes; and 3) adding 2-3% of clay stabilizer in mass percent, and stirring for 10-15 minutes; and sequentially adding 0.1-0.3% of bactericide and 0.3-0.5% of discharge aiding agent in mass percent under a stirring condition, stirring for 15 minutes, and fully dissolving. The fracturing liquid provided by the invention can greatly reduce fracturing construction pump pressure and has the characteristics of low surface tension, good discharge aiding agent, strong clay stabilizing capability, strong sterilization capability and no precipitation or flocculate.

The present invention discloses a polymer with a surface active function and a preparation method thereof, the polymer contains a structural unit A, a structural unit B and a structural unit C, the structural unit A is represented by formula (1), the structural unit B is represented by formula (2), the structural unit C is represented by formula (3), on the basis of total use amount mole number of the structural units of the polymer, the content of the structural unit A accounts for 8-45 mol%, the content of the structural unit B accounts for 50-91 mol%, and the content of the structural unit C accounts for 0.001 to 5 mol%; the viscosity-average molecular weight of the polymer is 10 million-28 million; the polymer can be used as a flooding polymer of a reservoir with low to medium permeability, and has the advantages of good water solubility, strong tackability and good temperature tolerance and salt-resisting properties and surface activity, and the polymer has good oil washing effect.

The invention discloses a preparation method of a tableware disinfectant, and belongs to the field of disinfectants. The method is characterized in that chitosan is used as a raw material for preparing an edible film, wherein chitosan is capable of adsorbing and antibacterial; three components can be effectively adsorbed through the chitosan and are slowly released while film forming, so that theantibacterial time of the tableware can be prolonged; meanwhile, the chitosan is antibacterial, and the edible film is an antibacterial film, and polyphenols are used for supporting, so that the disinfecting performance of the tableware disinfectant can be further improved; the volatile oil components include fragrant component which can be wrapped and released through chitosan, and thus the tableware is fragrant and pleasures people. With the adoption of the method, the problems that most of current disinfectants are chemical preparations which are good in disinfecting and easily damage humanbody in case of incomplete flushing during tableware disinfecting can be solved.

The invention belongs to the technical field of oilfield development, and discloses a self-phase-change proppant based on emulsified toughened bio-based epoxy resin. Bio-based epoxy resin is subjected to toughening modification through graphite particles, then SiO2 particles are used as an emulsifier for emulsification, the propping agent is prepared, the proportion of different meshes in the propping agent is adjusted by changing the concentration of the emulsifier during emulsification, and the chemical formula of the bio-based epoxy resin is shown in the specification. The proppant particles have good sphericity, so that the fracture permeability is high after the proppant particles are laid, and residual oil in formation pores can be effectively exploited, so that the development efficiency of an oil field is improved.

The invention discloses an anti-emulsifying and demulsifying cleanup additive. The anti-emulsifying and demulsifying cleanup additive comprises the following components, by mass: 0.5-5 parts of a fluorocarbon surfactant, 1-3 parts of a 1210 activator, 1-4 parts of a CAB-35 activator, 87-98 parts of softened water, and 0.5-1 part of a demulsification composition. The anti-emulsifying and demulsifying cleanup additive of the invention is composed of a plurality of activators, and so the anti-emulsifying and demulsifying cleanup additive can significantly reduce the interfacial tension of residual liquid surface, improve the wettability of rock surfaces, prevent blockage caused by the formation of an emulsified liquid, reduce the variety and quantity of liquid used in a well, and reduce the cost of construction liquid.

The invention discloses an emulsion type anti-wear and anti-drag thickening agent for fracturing and a preparation method thereof, and the preparation method comprises the following steps: 1, preparation of a water phase: successively adding acrylamide and triethanolamine oleic soap into water, and uniformly mixing; step 2, preparing an oil phase, namely adding span 80 into white oil, and then uniformly stirring and mixing; step 3, preparing an emulsion, slowly adding the water phase in the step 1 into the oil phase in the step 2 in a stirring state, and circularly emulsifying for 1-3 times by using a homogeneous emulsification pump after the water phase in the step 1 is completely added into the oil phase in the step 2; and 4, polymerization reaction: putting the emulsion prepared in the step 3 into a reaction kettle with a stirrer, stirring, filling nitrogen for more than 20 minutes, adding an oxidant, heating, and slowly dropwise adding a reducing agent. When the emulsion type anti-wear and anti-drag thickening agent for fracturing is used for preparing a fracturing fluid, the thickening property is good, and the construction friction resistance is low; when used for preparing coiled tubing construction liquid, the lubricating oil has good lubricating property and strong wear resistance.

The invention relates to guar gum fracturing fluid for ultrahigh-temperature reservoirs and a method for preparing the guar gum fracturing fluid. The guar gum fracturing fluid and the method have theadvantages that the seam generating and sand carrying performance of the guar gum fracturing fluid can be guaranteed under the condition that the temperatures of the reservoirs are higher than 140 DEGC, the guar gum fracturing fluid is particularly suitable for fracturing and production increase of high-temperature and ultrahigh-temperature sandstone and carbonate reservoirs and is low in surfaceinterfacial tension, residue content and friction drag, good in stratum viscose mineral stability and high in flow back speed, damage on the reservoirs due to fluid can be effectively reduced, fracturing transformation effects for the high-temperature and ultrahigh-temperature reservoirs and effects of production increase transformation measures can be improved, and the oil and gas recovery ratios of the high-temperature reservoirs can be increased.

The invention discloses a preparation method of a clean thickening agent for fracturing, and relates to the technical field of oil exploitation, specifically to a preparation method of a clean thickening agent for fracturing. Three single-chain surfactants with long hydrophobic carbon chains are bonded through short linking groups to form a trimeric surfactant; therefore, the repulsive force between head groups of the surfactant can be greatly reduced; the surfactant can be self-assembled to form wormlike three-dimensional micelles which are mutually wound in the transverse direction and the longitudinal direction; the elasticity is high, so that a good thickening effect and excellent salt resistance and temperature resistance can be achieved at low concentration, sand-carrying fracture forming requirements can be met, the micelles can be formed after simple mixing, fluid preparation is simple, use is convenient, requirements on water quality of the prepared fluid are low, formation water can be quickly prepared on site, and the temperature resistance and shearing resistance are good.

The invention relates to the field of crude oil extraction, and discloses an oil displacing polymer with the surface activity and a preparing method and application thereof. The polymer comprises a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A is a structural unit with the structure shown in the formula (1), the structural unit B is a structural unitwith the structure shown in the formula (2), and the structural unit C is a structural unit with the structure shown in the formula (3). According to the oil displacing polymer with the surface activity and the preparing method and application thereof, a hydrophobic monomer and a hydrophilic monomer are jointly introduced into a macromolecular chain of polyacrylamide to prepare a novel polymer with the surface activity, and the obtained novel polymer with the surface activity has the improved tackifying performance and emulsifying performance, the reduced surface and interfacial tension and the like. The formulas are defined in the description.