100results about How to "Good viscosity increase" patented technology

The invention relates to industrial lubricant and grease compositions containing high viscosity index polyalphaolefins (HVI-PAO). The use of HVI-PAOs in industrial oils and greases application provides advantages in improved shear stability, wear property, foam property, energy efficiency and improved overall performance.

The invention discloses a temperature resistant salt tolerant high efficiency gel and a preparation method and application thereof. The preparation method is characterized in that the preparation method comprises the following steps: preparing a comb-shaped associated copolymer PAH containing macromonomers and functional hydrophobic monomers into an aqueous solution having the concentration of 0.1 to 4g / L, the crosslinking agent concentration of 0.01 to 1.0g / L, the surfactant concentration of 0.01 to 8mmol / L and the sodium sulfite thermal stabilizer concentration of 0.005 to 1.0g / L; adding the aqueous solution into a mixing container with a stirring device; stirring the aqueous solution evenly at the room temperature; regulating the pH value of the solution to be equal to between 4 and 11, and obtaining a temperature resistant salt tolerant high efficiency gel polymer solution system used for tertiary oil recovery and scavenge, displacement modification, profile modification or water shutoff. The polymer solution system has micro-crosslinking to form the gel during the flowage inside the oil reservoir. The gel has good elasticity, not easy dehydration, stable gelling performance, and excellent tackification, temperature resistance, salt tolerance, shearing resistance and ageing resistance.

The invention discloses an acrylamide modified graft copolymer and a preparation method and usage thereof. The invention is characterized in that 20 parts of acrylamide, 1-20 anionic monomer and / or cationic monomer, 0.1-15 macromonomer, 0.05-10 ionic lyophobic monomer and 50-1000 deionized water are added into a three-necked reaction bottle, the pH value is adjusted to be 3-9, N2 is introduced for 30min, then 0.002-0.5 part of initiator persulfate is added at 30-75 DEG C, the reaction lasts 8-36h, then copolymer PAB is obtained, and finally water is used for dilution to obtain strong PAB solution. During polymerization, no surfactant is used, and the macromonomer with a long chain and the ionic lyophobic monomer with intermolecular association function are introduced into the copolymer PAB, so the capabilities of cooperative tackification and salt-resistance between the rigid conformation of a molecular chain and the intermolecular association can be played optimally, the PAB exhibits unique solution property and has higher colloidal viscosity in high saline solution than in fresh water, and the PAB obtains the capabilities of tackification, salt resistance, low surface tension and strong molecular association and can be used for the oil-displacing acrylamide modified graft copolymer. The copolymer is prepared into water solution with mass concentration of 0.2-3.0g / L and surfactant concentration of 0.01-2 mmol / L, then the water solution is added into a mixing vessel by a stirring device, and then a polymer oil-displacing agent with tackification, salt resistance and cutting resistance is obtained. The PAB has the functions of both a tackifier and a macromolecule surfactant. The copolymer PAB is prepared into water solution which has mass concentration of 0.05-7%, so the macromolecule surfactant with excellent surface activeness can be obtained and then applicable to an emulsifier, an emulsion splitter, a solubilizer and a wetting agent.

A photopolymerizable polymer micelle includes a spherical micelle that encapsulates a hydrophobic photopolymerization initiator, the spherical micelle being formed by a block copolymer having a hydrophilic block segment and a hydrophobic block segment, the block copolymer having a number average molecular weight exceeding 10000, and the hydrophobic block segment at least partially having a radically polymerizable group.

The invention discloses a non-linear associated water soluble quadripolymer as well as a preparation method and use thereof, comprising: adding 20 parts of acrylamide, 1-20 parts of nionic monomer or / and cationic monomer, 0.1-15 parts of macromonomer, 0.05-10 parts of hydrophobic monomer, 0.1-50 parts of surfactant and 60-1000 parts of deionized water to a three-necked reaction flask, adjusting the pH to be 3-9, adding 0.002-1 part of initiator (persulphate) at 30-75 DEG C after introducing N2 for 30min, reacting for 8-36h to obtain the quadripolymer PACH, diluting with water, and obtaining concentrated PACH solution. The macromonomer with a long chain and the hydrophobic monomer with a molecular association function are simultaneously introduced in a copolymer PACH, which can obtain the best synergistic viscosifying between rigid conformation of a molecular chain and molecular association and salt resistance. The non-linear associated water soluble quadripolymer is obtained. The copolymer is prepared into aqueous solution with the mass concentration of 0.2-3g / l and the surfactant concentration of 0.01-2mmol / l, added to a mixing vessel with a stirring device and evenly stirred at the room temperature to obtain a viscosified, salt-resistant and shear-resistant polymer oil displacement agent. The PACH has dual functions of a viscosifier and a high molecular surfactant; minute amount of a low molecular surfactant is added to the PACH solution, thus improving the apparent viscosity of the solution, reducing the surface tension of solution and the water-oil interfacial tension, and being beneficial to improving the crude oil recovery ratio. A copolymer PABE is prepared into the aqueous solution with the mass concentration of 0.05-7% to obtain high molecular surfactant with excellent surface activity, and the high molecular surfactant is used as an emulsifier, a demulsifier, a solubilizer and a wetting agent.

The invention discloses a comb-type amphipathicity water-solubility multipolymer and a method for making the same as well as an application. The method is characterized in that: 20 portions of acrylamide, 0.1 to 10 portions of negative ion monomer, 0.5 to 15 portions of at least one of the surface activity macromolecular monomer 4-vinyl benzyl alkylphenol polyoxyethylene ether or / and allyl alkylphenol polyoxyethylene ether and 30 to 600 portions of deionized water are added into a three-necked reaction bulb, the pH value of the solution is adjusted to between 4 and 9, N2 is introduced into the solution for 30 minutes, 0.002 to 0.3 portion of evocating agent sulphate is added at the temperature of between 30 and 70 DEG C to react 12 to 36 hours in order to prepare PABE which is diluted by water to obtain the PABE strong solution; the comb-type amphipathicity water-solubility multipolymer which can viscosify, has salt resistance and the low surface tension as well as the molecular association ability and can be used for the fuel scavenge. The multipolymer is prepared into a water solution with a mass concentration between 0.3 and 3g / L and a surface active agent concentration between 0.01 and 2mmol / L, the water solution is added into a blending container with a stirring device and is stirred evenly at room temperature so that the polymer oil-displacing agent which can viscosify and shear-resistant and has excellent anti-aging performance in a hyperhaline state and at the temperature of 70 DEG C. The PABE has the double function of a tackifier and a macromolecule surfactant. Infinitesimal low molecular surface active reagent is added into the PABE solution, thereby evidently increasing the apparent viscosity of the solution, reducing the surface tension and the oil-water boundary tension of the solution and contributing to improving the recovery ratio.

The invention discloses a hydrophobically associated polymer-composite surfactant binary combination flooding system and method. The hydrophobically associated polymer-composite surfactant binary combination flooding system mainly comprises the following components in percentage by weight: 0.08-0.3 wt% of hydrophobically associated polymer, 0.05-0.5 wt% of composite surfactant and 99.2-99.87 wt% of water. The composite surfactant is composed of the following components in percentage by weight: 50-70 wt% of fatty acid diester disulfonate and 30-50 wt% of oleic acid diglycollic amide. The hydrophobically associated polymer-composite surfactant binary combination flooding system has favorable tackifying property, and enables the oil-water interfacial tension to reach 10<-3>nM / m under low surfactant concentration (0.05%), thereby enhancing the displacement efficiency; and the hydrophobically associated polymer-composite surfactant binary combination flooding system can enhance the recovery rate by more than 30% on the basis of water flooding, lowers the polymer consumption by more than 50% as compared with the 250-million ultrahigh-molecular-weight polyacrylamide binary combination flooding system with close properties, and enhances the recovery rate by 6%, thereby greatly lowering the oil displacement cost on the premise of increasing the yield.

The invention discloses an inorganic-organic salt-resisting and high temperature-resisting polymer fluid loss additive for drilling fluid, which is characterized in that: 2-acrylamide group-2-methyl sodium propanesulfonic acid, dimethyl diene propyl group ammonium chloride, acrylamide and sodium acrylate are used as main polymers, and inorganic salt is used as transformation temperature stabilizing agent. Aqueous solution is prepared according to a certain mass ratio, initiators are added for polymerization at certain temperature, so as to generate macromolecule polymer of elastic colloid, and after drying and grinding are carried out, a target compound is obtained. The additive is easy to dissolve in water, has good capacity of filtration loss reduction, temperature resistance, salt resistance, calcium resistance and magnesium pollution resistance, has good tackifying effect, can effectively control mud making of the stratum and inhibit the dispersion of clay and drilling cuttings, and has good compatibility with the common treating agents.

The invention discloses a method for preparing an allyl surface-active macromonomer, which is characterized by comprising the following steps: adding 20 portions of alkylphenol polyoxyethylene ether (CmH2m+1-C6H4-O-(CH2CH2O)nH, n is equal to 1 to 60, and m is equal to 1 to 20), 10 to 900 portions of solvent and 0.1 to 15 portions of catalyst into a three-mouth reaction flask with a reflux condensation device, and reacting the mixture for 1 hour under stirring at the room temperature; increasing temperature to 30 to 95 DEG C, adding 0.5 to 20 portions of allyl chloride into the reaction product, and continuously reacting for 6 to 48 hours; distilling the reaction product under reduced pressure to remove the solvent so as to obtain a crude product; and performing silica gel column chromatographic separation to obtain allyl alkylphenol polyoxyethylene ether with the yield of 70 to 95 percent. The allyl alkylphenol polyoxyethylene ether has excellent surface activity, and can be directly used as a surfactant. A water-soluble copolymer synthesized by taking the allyl alkylphenol polyoxyethylene ether as a surface-active macromonomer has the function of tackifying, or reducing solution surface tension and water-oil interfacial tension, and can be taken as a tackifying copolymer or a macromolecular surfactant for improving the oil recovery ratio.

The invention discloses a temperature-resistant calcium-tolerant inverse emulsion polymer for drilling fluids. The polymer is prepared by polymerization of a sulfonic acid group-containing monomer water solution with a mass fraction of 50%, N, N-dimethylacrylamide, acrylamide, a crosslinking agent, water, white oil, a span-80 emulsifier, a propylene glycol monolaurate emulsifier, an OP-15 or Tween-80 emulsifier, an ammonium persulfate water solution or a potassium persulfate water solution with a mass fraction of 10% as an initiator, a sodium thiosulfate water solution with a mass fraction of 10%, an azodiisobutyl imidazoline hydrochloride solution with a mass fraction of 5%, soda ash, and an ethylenediaminetetraacetic acid disodium salt. The inverse emulsion polymer provided in the invention has good abilities of filtration loss reducing, viscosity increasing, flow pattern regulating, hydration dispersion inhibiting of clay and drill cuttings, and can improve filter cake quality, enhance drilling fluid lubricity, thus being suitable for various water-based drilling fluids and being able to be used as a high-temperature, high-salt and high-calcium drilling fluid additive.

The invention relates to a low-surface-tension solid-free reservoir protection drilling fluid, and belongs to the technical field of petrochemical engineering. The low-surface-tension solid-free reservoir protection drilling fluid comprises, by mass, 0.2-0.3 gram of sodium carbonate, 0.2-0.4 gram of PH-value conditioning agent, 0.8-1 gram of polymer emulsion powerful coat agent, 1.5-2.5 grams of fluid loss additive, 0.3-1 gram of shearing potentiator, 2-3 grams of polymeric alcohol, 0.5-1.5 grams of surfactant, 0.05-0.1 gram of antioxidant and 0-300 grams of soluble salt in every 100ml of water in an evenly-mixed mode. The low-surface-tension solid-free reservoir protection drilling fluid does not have the solid content, the surface tension is lower than 30mN / m, and the low-surface-tension solid-free reservoir protection drilling fluid has the good reservoir protection effect and is particularly suitable for horizontal well reservoir section drilling.

The invention discloses a wear-resistant heat-resistant anti-aging rubber material. The raw materials comprises the following components in parts by weight: 30-40 parts of styrene butadiene rubber, 10-18 parts of butyl rubber, 10-20 parts of chloroprene rubber, 1-3 parts of a silane coupling agent, 1.5-3 parts of LH-C96 vulcanizing agent, 0.5-1.5 parts of CZ accelerator, 2-4 parts of magnesium oxide, 5-8 parts of phenolic resin, 4.0-4.4 parts of trioctyl trimellitate, 0.3-0.5 part of paraffin, 2-4 parts of environment-friendly flame retardant FR-T801, 0.5-1.5 parts of antimony trioxide, 18-23 parts of nanometer carbon black, 15-20 parts of white carbon black, 20-30 parts of carbon black N375, 15-20 parts of modified kaolin, 2-5 parts of anti-aging agent RD and 2-4 parts of anti-aging agent 4010NA. The rubber material disclosed by the invention has the advantages of excellent abrasion resistance, heat resistance and aging resistance.

The invention discloses a preparation method of a tackifier for a drilling fluid. The method comprises the following steps of: adding 71 kg of acrylamide and 700 kg of water into a polymerizing kettle, preparing a 20 percent acrylamide aqueous solution, adding 0.1 kg of initiator after a certain period of time, and reacting at constant temperature for a certain period of time to obtain gel polyacrylamide; taking the gel polyacrylamide out, pelletizing, and preparing into 2 percent polyacrylamide aqueous solution; adjusting the pH of a system to 11 with a sodium hydroxide solution, adding 85 kg of formaldehyde and 100 kg of sodium bisulfite aqueous solution, and reacting with stirring for a certain period of time to obtain sulfomethylated polyacrylamide gel; precipitating and separating reactants with 95 percent ethanol, and recycling and distilling an ethanol aqueous solution for circular use; and taking a precipitated polymer, removing ethanol, drying in vacuum and crushing to obtain a product. The tackifier has large tackifying and flow pattern adjusting capabilities, and can be used for keeping the viscosity of the drilling fluid under severe conditions such as high temperature, high salinity, high calcium-magnesium ions and the like.

The invention discloses water-solubility micro-crosslinking copolymer, a method for making the same and an application of the same. The method is characterized in that: 20 portions of acrylamide, 0.5 to 15 portions of anion monomer, 0.1 to 6 portions of divinyl benzene, 0.5 to 50 portions of sodium laurylsulfate and 50 to 800 portions of deionized water are added in a three-necked reaction bottle, and the pH value of the solution is adjusted to between 4 and 9; after N2 is injected for 30 minutes, 0.001 to 0.2 portions of initiator persulphate is added in at a temperature of between 30 and 70 DEG C so as to carry out reaction for 6 to 36 hours, thereby obtaining PADM; then, the PADM is diluted by water to obtain a PADM solution, thereby obtaining the water-solubility micro-crosslinking copolymer which has ideal water solubility, copolymerization micro-crosslinking structure, difficult intramolecular crimp and molecular association capacity and can be used in oil expulsion. The copolymer is made into an aqueous solution with the mass concentration of between 0.3 and 3 g / L and the surfactant concentration of between 0.01 and 4 mmol / L, and then is added in a mixing vessel provided with a stirring device so as to be stirred evenly at room temperature, thereby obtaining a polymer oil displacement agent which is tackifying, salt resistant, thermotolerant and shear resistant and has excellent age resistance under the conditions of high salt and 110 DEG C. Moreover, the raw materials of PADM are easy to obtain; therefore, the water-solubility micro-crosslinking copolymer and the method have enormous application prospect in increasing crude oil recovery ratio.

The invention discloses a surface-active two-tailed hydrophobic associated polymer and a preparation method thereof; the surface-active two-tailed hydrophobic associated polymer is prepared via micellar free radical copolymerization: adding a surfactant, sodium lauryl sulfate, and a hydrophobic monomer, N-phenethyl-N-alkyl (methyl) acrylamide or N-benzyl-N-alkyl (methyl) acrylamide into the aqueous solution of acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and surface-active macromonomer polyoxyethylene lauryl ether (methyl) acrylate, using the surfactant to solubilize the hydrophobic monomer in the formed micelle, using sodium hydroxide to adjust pH to 6-8, and copolymerizing the hydrophobic monomer and a water-soluble monomer by means of photo-initiation. The properties, such as tackifying performance, temperature resistance, salt resistance and hydrolysis resistance, of the polymer can be effectively improved, the preparation method and principle of the polymer are reliable, and the preparation method is simple to perform and has a promising application prospect.

The invention discloses an anti-high-salinity comb-type micro-segmented hydrophobic associated polymer and a preparation method thereof. The preparation method includes: adopting a mixed micelle polymerization method to prepare the comb-type micro-segmented hydrophobic associated polymer: adding a surfactant (SDS), a cationic hydrophobic monomer and a nonionic surface activity monomer into a water solution containing water-soluble monomers like acrylamide and acrylic acid to form mixed micelle; solubilizing a double-tail hydrophobic monomer N-aryl-N-alkyl(methyl) acrylamide(PEMAM) in the mixed micelle; copolymerizing the hydrophobic monomer and the water-soluble monomer by means of photo-initiation to obtain the comb-type micro-segmented hydrophobic associated polymer. The polymer has a comb-type structure, so that temperature resistance, tackifying performance and salt resistance of the polymer are improved; a micro-segmented hydrophobic structure endows the polymer with excellent salt resistance and tackifying performance, and consumption of the polymer can be effectively lowered; the temperature-resistant salt-resistant polymer which can be used for chemical flooding of oil fields is prepared by combining advantages of the comb-type structure and the micro-segmented hydrophobic structure.

The invention discloses zwitterionic hydrophobic modified guar gum which is characterized in that the structural formula of the zwitterionic hydrophobic modified guar gum is shown in the specification, wherein R1 is a long-chain organicacid, concretely a long-chain saturated acid with a carbon chain of 6-14 or a long-chain unsaturated acid with a carbon chain of 18-22. The invention also disclosesa preparation method of the guar gum. The preparation method comprises the following steps: introducing an anionic monomer into the guar gum to form an anionic guar gum modified product; preparing awater-soluble amphiphilic cationic hydrophobic monomer from hydrophobic long chain, 3-dimethylaminopropylamine and epoxy chloropropane; and introducing the water-soluble amphiphilic cationic hydrophobic monomer into the anionic guar gum modified product to form an amphoteric hydrophobic modified product. The special electrostatic interaction and hydrophobic association of zwitterions are fully utilized to endow the guar gum molecular chain with special dispersity and rheological property, so that the disclosed guar gum has excellent solubility, tackifying property, temperature resistance and salt resistance.

The invention relates to a preparation method of a modified nanometer SiO2-AA-AM copolymer. The preparation method comprises that a modified nanometer SiO2 functional nanometer, acrylamide and acrylic acid are mixed, pH of the mixed solution is adjusted to 6.0-7.5 by sodium hydroxide, distilled water is added into the mixed solution so that an aqueous solution with the monomer total mass concentration of 20.0-26.0% is obtained, an initiator is added into the aqueous solution, the mixed solution undergoes a reaction at a temperature of 36.0-42.0 DEG C in a nitrogen protective atmosphere to produce a reaction product, and the reaction product is washed, crushed and dried to form the copolymer. The nanometer SiO2 is introduced into the copolymer, and an amino group is connected to the surface of the nanometer SiO2 so that a double bond is connected to the surface of the nanometer SiO2 and thus the nanometer SiO2, acrylic acid and acrylamide undergo a polymerization reaction to produce the copolymer. The copolymer has a spatial network structure. Through control of a modification degree of the surface of a modified nanometer SiO2 functional monomer, copolymer viscosity-increasing performances are improved.

The invention discloses alkenyl-branched monomers and a preparation method thereof, and belongs to the field of organic synthetic chemistry. The monomers are prepared by the steps of reacting a hydroxyethyl-containing branched polyamide intermediate and acryloyl chloride at a room temperature in presence of an organic solvent and an acid-trapping agent; standing; separating an organic phase; washing for a plurality of times by neutralizing with a saturated sodium bicarbonate solution; drying by using anhydrous sodium sulfate; steaming the organic solvent out to obtain a crude product; and further purifying the crude product to obtain a polymer grade product. The monomers can be used as co-polymerization monomers to prepare hyperbranched polymers used for oilfields and to prepare branched water-soluble polymers for other applications and emulsifiers for emulsion polymerization.

The present invention discloses a seawater-based fracturing fluid and a preparation method thereof. 100 parts of the fracturing fluid comprises, by weight, 0.3-0.8 part of a thickener, 0.1-0.6 part of a cross-linking agent, 0.05-0.1 part of an oxygen scavenger, 0.02-0.05 part of a tackifying auxiliary agent, 0.05-0.2 part of gel breaker, and the balance or part of seawater, wherein the thickener modified polyacrylamide is formed by carrying out copolymerization on acrylamide, a hydrophobically modified monomer and a sulfonate, the hydrophobically modified monomer is dodecyl alkyl halide, and the cross-linking agent is an organic zirconium cross-linking agent or an organic titanium-zirconium composite cross-linking agent. According to the present invention, with the seawater-based fracturing fluid and the preparation method thereof, the technical problems of being incapable of continuously mixing, insufficient tackifying performance, poor salt resistance and poor shearing resistance of the seawater-based fracturing fluid in the prior art are solved; and the seawater-based fracturing fluid with characteristics of good tackifying, strong salt resistance, strong shearing resistance and continuous mixing and suitable for offshore oil fields is provided.

The invention relates to high-strength antiflaming polyester industrial filaments and a preparation method thereof. Particularly, by utilizing processes of low-temperature vacuum viscosity improvement, high-temperature viscosity improvement and high-temperature solid-phase viscosity improvement, phosphorus-containing viscosity-improvement polyester chips are prepared, and by utilizing a melt spinning process of the antiflaming viscosity-improvement polyester chips, high-strength antiflaming polyester industrial filaments are prepared. The intrinsic viscosity of the antiflaming viscosity-improvement polyester chips is 1.05-1.25 dL / g, the terminal carboxyl group content is 12-22 mmol / kg, the average molecular weight is 35,000-45,000, the molecular weight distribution coefficient PDI is 1.05-1.08, the phosphorus content is 0.3-4.0 wt%, and the limit oxygen index is 28-36%; the linear density of the high-strength antiflaming polyester industrial filaments is 200-5,000 D, the single filament fineness is 1.5-20 dpf, the breaking strength is 6.5-7.6 cN / dtex, the content of phosphorus in fibers is 0.3-1.0%, the limit oxygen index is 28-34%, and after a plain weave fabric is washed with 0.1mol / L sodium hydroxide for 15 minutes at 80 DEG C, the limit oxygen index is greater than or equal to 28%. The high-strength antiflaming polyester industrial filaments have high strength, excellent antiflaming performance and good washable performance, are used for the fields of advertising cloth, fire-fighting hoses, oil containing bags of military boxes and the like and have an important application prospect.

The invention discloses a multifunctional thickening agent and a preparation method thereof. The multifunctional thickening agent is prepared from the following raw materials in parts by weight: 30-50parts of a water-soluble thickening agent, 45-55 parts of solketal, 3-5 parts of D-limonene and 1-2 parts of a suspending agent. The multifunctional thickening agent disclosed by the invention has excellent resistance reducing, salt resisting, sand carrying and viscosity changing capabilities, can realize online viscosity changing operation, has the advantages of a powder thickening agent and anemulsion thickening agent, and is convenient to use; the water-soluble dispersing agent is matched with the D-limonene, and is matched with specially-made modified bentonite, so that the stability ofthe obtained ultra-dispersion system is greatly improved.

The invention provides a tackifying and filtrate reducing agent for a low soil phase and high density drilling fluid, and a preparation method thereof. The tackifying and filtrate reducing agent is a polymer formed through appropriate cross-linking polymerization of an olefin monomer and a silane coupling agent. The preparation method comprises the following steps: 1, mixing acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, acrylonitrile, N-isopropylacrylamide and the coupling agent in water; 2, adjusting the pH value to 5-10; 3, introducing nitrogen to remove oxygen, adding an initiator at 20-90DEG C, and reacting for 1-10h to obtain a viscous product; and 4, drying the viscous product, and crushing. The tackifying and filtrate reducing agent for the low soil phase and high density drilling fluid has good temperature and salt resistance; the tackifying and filtrate reducing agent has good tackifying and shear strength improving effects in the low soil phase and high density drilling fluid, and is in favor of suspending a weighting material and carrying rock debris; and channels in mud cakes are plugged to improve the viscosity of a liquid phase, effectively reduce the filtrate loss and improve the wellbore stability.

The invention belongs to the field of daily chemical industry, and relates to a green phosphorus-free washing powder and a preparation method thereof. It is made of the following raw materials in the following weight ratio: 10-30 parts of sodium alkylbenzene sulfonate, 10-30 parts of alkyl glycoside 20 parts, 10-30 parts of sodium percarbonate, 15-25 parts of anhydrous sodium sulfate, 5-10 parts of sodium carbonate, 3-8 parts of sodium silicate, 0.5-2 parts of sodium carboxymethyl cellulose, 1-5 parts of zeolite part, 0.1-0.3 part of fluorescent whitening agent, 0.2-0.4 part of protease, and 0-0.2 part of essence. drying, pulverizing and sieving to obtain the green phosphorus-free washing powder. The invention has the advantages of low cost and simple process, and the prepared washing powder has good hard water resistance, strong decontamination ability, rich foam, mild hand washing, clean and bright clothes after washing, and long-lasting fragrance. It adopts green and environmental protection formula, and the degradation rate of raw materials is high.

The invention discloses a starch-based composite seed coating agent and a preparation method thereof and aims to solve the problems that common starch is poor in film formation property and easily lost through dissolution when being applied to a film forming agent; the requirements on the film formation property and the cohesiveness cannot be satisfied simultaneously when certain high-molecular film forming substance is used independently. The composite seed coating agent is divided into an inner layer and an outer layer, wherein the inner layer takes etherified starch as a base material, contains a bactericide, an insecticide, a plant growth inhibitor, a fertilizer and the like, and can be used for preventing diseases and insect pests of seeds to a certain extent; the outer layer takes the starch base a substrate; graft copolymerization of an acrylic acid monomer is triggered by free radicals to prepare a film layer and a water retaining layer; the film layer and the water retaining layer are good in cohesiveness and film formation property, can be used for protecting components of the inner layer from loss and also have water retention property and moisture retention property, so that the germination rate and planting percent of the seeds are increased. The starch-based composite seed coating agent disclosed by the invention is broad-spectrum and suitable for seed coatings of crops such as vegetables, flowers and grains.

The invention discloses a viscoelastic surfactant for high-temperature self-diverting acid. The structural formula of the viscoelastic surfactant is as shown in the specification, wherein n refers tosaturated alkane with 2-8 carbon atoms, R1 refers to saturated or unsaturated alkane with 18-28 carbon atoms, R2 and R3 refer to independent methyl, ethyl and hydrogen atoms and can be the same or different, and X refers to optional one of Cl<->, Br<->, F<->, CO3<2->, SO4<2->, HCOO<-> and CH3COO<->. The preparation method includes subjecting aliphatic acid and organic amine to acid and amine condensation reaction to obtain an intermediate product, subjecting the intermediate product to reaction with metallic oxide to obtain aliphatic amine, adding in acid solution to perform protonation, so asto obtain the very-long viscoelastic cation surfactant. The invention further provides the application of using the surfactant as a thickening diverter of self-diverting acid. The self-diverting acidutilizing the surfactant as the thickening diverter can be used at the temperature of 150 DEG C, and has the advantages of stable structure, thickened acid, uniform acidification, automatic divertingand the like.

The invention belongs to the technical field of polymer and discloses hydrophobically modified hyperbranched polymer and a preparation method thereof. The polymer is prepared by a photo-initiation free radical micelle copolymerization method. The method includes: adding surfactant lauryl sodium sulfate and N-benzyl-N-alkyl(methyl) acrylamide into an aqueous solution containing water-soluble monomers such as acrylamide, acrylic acid, 2-acrylamido-2-methylpropane sulfonic acid and hyperbranched modified monomers, using the surfactant to solubilize hydrophobic monomers into formed micelle, and using photo-initiation to copolymerize the hydrophobic monomers and the water-soluble monomers. The prepared hydrophobically modified hyperbranched polymer is good in solubility, high in viscosity increasing ability, good in temperature and salt resistance, good in shearing resistance, capable of being used as an oil-displacing agent capable of increasing oil recovery ratio or an acid fracturing thickening agent and promising in application prospect.

The invention discloses a thickening agent for cleaning foamed fracturing fluid and a preparation method of the thickening agent. The thickening agent comprises the following components in percentage by weight: 5-6% of N,N'-methylene bisacrylamide MBA, 15-18% of a basic functional monomer, 3-5% of a specific functional monomer, 2-3% of a cationic polymerizable amphiphilic monomer, 3-5% of a regulator, 5-10% of an ionic activating agent, 2-4% of a dissolution accelerant, 0.08-0.15% of an initiating agent, and the balance of deionized water. The preparation method of the thickening agent comprises the steps of adding the above components into a reaction kettle to perform aqueous solution multi-component copolymerization, and preparing a polymer product by virtue of a certain post-treatment process. The thickening agent disclosed by the invention has a good viscidity increasing ability, and is good in solution viscoelasticity and heat-shearing resistance; the polymer, after being used as a thickening agent for N2 and CO2 foamed fracturing fluid, has good foaming property and foam stability; and the foamed fluid itself does not need to act with a high-valence metal crosslinking agent, and greatly reduces undissolved substance residue damages caused by water sensitivity, water blocking damages and the thickening agent, so that the fracturing construction effect can be greatly improved.

The present invention discloses a seawater-based fracturing fluid and a preparation method thereof. 100 parts of the fracturing fluid comprises, by weight, 0.3-0.8 part of a thickener, 0.1-0.6 part of a cross-linking agent, 0.05-0.1 part of an oxygen scavenger, 0.02-0.05 part of a tackifying auxiliary agent, 0.05-0.2 part of gel breaker, and the balance or part of seawater, wherein the thickener modified polyacrylamide is formed by carrying out copolymerization on acrylamide, a hydrophobically modified monomer and a sulfonate, the hydrophobically modified monomer is dodecyl alkyl halide, and the cross-linking agent is an organic zirconium cross-linking agent or an organic titanium-zirconium composite cross-linking agent. According to the present invention, with the seawater-based fracturing fluid and the preparation method thereof, the technical problems of being incapable of continuously mixing, insufficient tackifying performance, poor salt resistance and poor shearing resistance of the seawater-based fracturing fluid in the prior art are solved; and the seawater-based fracturing fluid with characteristics of good tackifying, strong salt resistance, strong shearing resistance and continuous mixing and suitable for offshore oil fields is provided.

The invention relates to a preparation method of a viscoelastic surfactant for development of a low-permeability oil reservoir, and belongs to the technical field of oilfield chemistry. The preparation method comprises the following steps: reacting 1-methylpiperazine with long-chain organic acid to prepare an amidation product; and then, reacting the amidation product with a sulfonation reagent toprepare the ampholytic surfactant. The surfactant has excellent dissolution, temperature resistance and salt resistance; a viscoelastic system can be formed at a low concentration, and an excellent tackifying effect is achieved; and in addition, the surfactant is controllable in adsorption, interfacial tension change, wettability adjustment and other properties, and has a good imbibition oil recovery effect on low-permeability oil reservoirs.