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.

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 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 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 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 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 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 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 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.