80results about How to "High viscosity reduction rate" patented technology

The invention relates to an oxidization viscosity reducer for viscous oil recovery by steam injection and a preparation method thereof. The oxidization viscosity reducer comprises components by weight percentage: 0.5 to 10 percent of component A, 0.5 to 10 percent of component B, 0.1 to 8 percent of component C, 0.1 to 5 percent of component D, and the balance being water, wherein the component Ais peroxide, the component B is transition metal salt of an organic acid, the component C is inorganic salt with the acidity shown in a hydrolysate, and the component D is an alkaline substance. The oxidization viscosity reducer can oxidize gelatine and asphaltine in viscous oil, reduce the viscosity of crude oil by changing a structure of the viscous oil through chain termination, oxidize to generate an acid substance at the same time, ensure that the viscous oil becomes a substance with the effect of a surfactant by adding the alkaline substance, and also play a role in viscosity reduction.The experiments show that the viscosity reduction rate can reach 99.9 percent when the viscosity reducer reacts with the crude oil for 24 hours at the temperature of 100 DEG C. The viscosity reducer has higher viscosity reduction rate, is applicable to the viscosity reduction of oil well stratums with high steam injection temperature, and also has good effect under relatively lower temperature conditions.

The invention discloses a polymeric surfactant heavy oil viscosity reducer and a preparation method, and mainly solves the problem of poor viscosity reduction effect of existing heavy oil viscosity reducers. The preparation method includes: firstly reacting maleic anhydride with nonylphenol polyoxyethylene ether to obtain an intermediate product, and then reacting the intermediate product with a certain amount of acrylamide to prepare the polymeric surfactant. The surfactant has the advantages of reliable preparation process, low cost and low use concentration, and has the ability of significantly reducing the heavy oil viscosity.

The invention relates to a self-demulsification heavy oil viscosity reducer as well as a preparation method and application thereof. The preparation method is characterized in that the self-demulsification heavy oil viscosity reducer is prepared by taking acrylamide, sodium p-styrenesulfonate and octadecyl acrylate as main raw materials; the selected raw materials have low cost and can be preparedinto the self-demulsification heavy oil viscosity reducer by adopting a simple traditional preparation process; meanwhile, an obtained product has high yield and has great advantages in a productionlink of a product; besides, the self-demulsification heavy oil viscosity reducer disclosed by the invention has the advantages of excellent viscosity reduction capability, good temperature and salt resisting effects, more outstanding viscosity reduction effect of extra-heavy oil and self-demulsification performance; integration of viscosity reduction and demulsification can be realized, and efficient oil extraction is realized.

The invention belongs to the field of catalyst synthesis, and particularly relates to a preparation method and an application of a catalyst for visbreaking behavior of heavy oil by aquathermolysis. The method comprises specific steps as follows: ferric chloride is weighed and added to a three-neck beaker, ethanol, water, n-hexane and oleic acid are added to the three-neck beaker in sequence, magnetic stirring is performed, NaOH is added, heating and reflux condensation are performed, after a ferric oleate compound and an oleic acid mixture are synthesized and added to sodium alkylbenzene sulfonate, a mixture is dissolved in octyl ether, 1-octadecene or 1-eicosylene, a mixed solution is subjected to temperature programming and then cooled to the room temperature, ethanol is added to the solution, centrifugal separation is performed, and the target product, namely, the catalyst for visbreaking behavior of the heavy oil by aquathermolysis is obtained. The target product is cheap and easily available and has low energy consumption and excellent visbreaking effect, and physical properties and nanoscale can be set by selecting correct reaction temperature, reaction solvent or reaction time.

The invention relates to the technical filed of viscosity reducers, and relates to an active catalytic viscosity reducer for viscous oil recovery, and a preparation method and an application thereof. The structural general formula of the active catalytic viscosity reducer for viscous oil recovery is [R-O-(EO)mCH2CO2]2M, wherein R is a C12-18 linear or branched alkyl group, EO is an oxyethylene group, m is the number of the oxyethylene group, and m is an integer between 2 and 6; and M is a nickel ion or a manganese ion or a copper ion or a zinc ion. The viscosity reduction rate of the active catalytic viscosity reducer for viscous oil recovery obtained in the invention is greatly higher than that of viscosity reducers in the prior art, so the viscosity reduction effect of the active catalytic viscosity reducer for viscous oil recovery is good; and the active catalytic viscosity reducer for viscous oil recovery is suitable for viscosity reduction of stratum of well steam injection wells, and is also suitable for high temperature steam catalytic oil displacement.

The invention provides a polymer heavy oil emulsifying viscosity reducer and a preparation method and application thereof. The polymer heavy oil emulsifying viscosity reducer comprises the following components: acrylamide, a sulfobetaine monomer and an itaconic acid double-long-chain ester monomer, wherein the molar ratio of the acrylamide to the sulfobetaine monomer to the itaconic acid double-long-chain ester monomer is (65-70): (30-45): (1-5). The polymer heavy oil emulsifying viscosity reducer disclosed by the invention contains a quaternary ammonium type cation structure, so that the foaming capacity is relatively strong, heavy oil can be effectively emulsified, the preparation method is simple and easy to control in process and few in byproducts, and the problems of poor viscosity reduction effect, relatively poor temperature resistance and salt resistance, poor emulsifying effect and the like are effectively solved.

The invention relates to a preparation method for oil-soluble thickened oil hydrothermal catalytic cracking viscosity breaking agent, which is characterized by comprising the following steps of: 1) choosing raw materials at the following ratio: 3-5g of gallic acid, 5-10ml of halogenated hydrocarbon, 10-100ml of organic solvent, 8-15g of anhydrous carbonate, 80-100ml of aqueous alkali with the concentration of 2-5mol/L, 100ml of absolute methanol and 3-7g of nickel salt for later use; 2) preparing oil-soluble catalyst viscosity breaking agent: respectively adding the gallic acid, the halogenated hydrocarbon and the anhydrous carbonate into a round bottom flask; then adding the organic solvent; introducing nitrogen into the round bottom flask; carrying out thermal stirring and backflow for 12-24h at the temperature of 50-70 DEG C; filtering the obtained product; carrying out reduced pressure distillation to obtain transparent oily liquid; dissolving the product into the absolute methanol; adding aqueous alkali; carrying out backflow for 3h at the temperature of 30-50 DEG C; hydrolyzing the product; carrying out reduced pressure distillation to obtain methyl alcohol; slowly dipping diluted hydrochloric acid into the solution until the pH value of the solution is 7-8; then, slowly dipping nickel salt solution; stirring for full reaction and filtering and drying to obtain nattier blue powder, i.e. the oil-soluble catalyst viscosity breaking agent. The viscosity breaking agent has the characteristics of good viscosity breaking effect, strong popularity and simple preparation process.

The invention provides a thickened oil viscosity-reducing oil washing agent for synergistic polymer flooding as well as a preparation method and application thereof, and belongs to the technical field of oil exploitation. The thickened oil viscosity-reducing oil washing agent for synergistic polymer flooding provided by the invention comprises the following components in percentage by mass: 25%-35% of an anionic surfactant, 10%-20% of a zwitterionic surfactant, 10%-20% of a nonionic surfactant, 10%-20% of low-carbon alcohol and the balance of water. When the viscosity-reducing oil washing agent provided by the invention is applied to the recovery of heavy oil with the formation temperature of 70 DEG C and the crude oil viscosity of 1314 mPa.s, the interfacial tension is less than or equal to 8.9 * 10 <-2 >, the viscosity reduction rate is greater than or equal to 81.7%, the oil washing efficiency is greater than or equal to 42.1%, the polymer viscosity retention rate is greater than or equal to 97.4%, the effect is remarkable, and the preparation process is simple, low in cost and green and environment-friendly.

The invention relates to a preparation method of an oil-soluble aquathermolysis catalytic viscosity reducer for thickened oil. The preparation method is characterized by comprising the following steps: 1) selecting the following raw materials in proper proportions: 3-5g of gallic acid, 5-10mL of halogenated hydrocarbon, 10-100mL of an organic solvent, 8-15g of anhydrous carbonate, 80-100mL of 2-5mol/L aqueous alkali, 100mL of absolute methanol and 3-7g of nickel salt; 2) adding gallic acid, halogenated hydrocarbon and anhydrous carbonate to a round-bottom flask respectively, next, adding the organic solvent, introducing nitrogen and performing heating and stirring reflux at a temperature of 50-70 DEG C for 12-24 hours, filtering the obtained product, and performing reduced-pressure rotary evaporation to obtain a transparent oily liquid, next, dissolving the product in the absolute methanol, adding the aqueous alkali, and hydrolyzing the product by virtue of reflux at a temperature in the range of 30-50 DEG C for 3 hours, performing reduced-pressure rotary evaporation to separate out the methanol, slowly and dropwise adding diluted hydrochloric acid to the solution until the pH value is in the range of 7-8, next, slowly and dropwise adding a nickel salt solution, stirring for reacting thoroughly, and then filtering and drying to obtain bluish powder, namely the oil-soluble aquathermolysis catalytic viscosity reducer.