79results 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 preparation method of a depolymerized and dispersed viscosity reducer of heavy oil. The preparation method comprises selecting N,N-Dimethyloctadecylamine as a hydrophobic group monomer, and diethylene triamine, epoxy chloropropane and benzyl chloride as hydrophilic group monomers, and ethanol as a solvent. The preparation method sequentially comprises the following steps: (1) adding the N,N-Dimethyloctadecylamine (N,N-Dimethylhexadecylamine) and the ethanol to a reaction vessel with a stirring device, evenly mixing and keeping the mixture at constant temperature for 0.5h; (2) slowly dripping the epoxy chloropropane with a dropping funnel to the reaction vessel, heating to 70 DEG C-75 DEG C, and reacting for 1-4h to generate HDI-1; (3) dripping the epoxy chloropropane to the diethylene triamine at room temperature to generate HDI-2; (4) allowing reaction products in (3) and (2) to react to generate HDI-3; and (5) dripping the benzyl chloride with the dropping funnel to the HDI-3, evenly stirring the mixture, and reacting at increased temperature of 90-95 DEG C for 2-5h to obtain the target product HD.

The invention relates to a polymer type viscosity reducer used in a heavy oil recovery process, concretely to a temperature-resistant and salt-resistant amphiphilic polymer heavy oil viscosity reducerand a preparation method thereof. The viscosity reducer is generated by 1-vinyl-2-pyrrolidone, acrylamide and methacryloxypropyltrimethoxysilane under the action of an initiator. A mol ratio of the 1-vinyl-2-pyrrolidone, the acrylamide and the methacryloxypropyltrimethoxysilane is 1:0.05-10:0.05-20, preferably 1:1.2:2.3. The heavy oil viscosity reducer of the invention has good temperature resistance and salt resistance, the temperature resistance is above 220 DEG C, and the mineralization resistance is above 100000 mg/L. The heavy oil viscosity reducer of the invention has the characteristics of good universality, low use concentration and high viscosity reduction rate, and can reduce more than 98% of the viscosity of heavy oil within 1000-10000 mPa.s under the condition that the use concentration is 200 ppm. Therefore, the temperature-resistant and salt-resistant amphiphilic polymer heavy oil viscosity reducer and the preparation method thereof can be widely applied to heavy oil recovery.

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 provides a siloxane quaternary ammonium salt modified amphiphilic polymer ultra-heavy oil viscosity reducer and a preparation method and an application thereof. Firstly, two kinds of double bond-containing siloxane-based quaternary ammonium salt monomers with different structural features are synthesized, and the viscosity reducer is obtained through radical solution polymerization of the double bond-containing siloxane-based quaternary ammonium salt monomers with cationic monomers and acrylamide respectively. The viscosity reducer is used for ultra-heavy oil and has good viscosity reducing effects, temperature resistance and salt resistance, excellent viscosity reducing effects and the like for high-mineralization ultra-heavy oil. The ultra-heavy oil is easy to be demulsified and dehydrated after being subjected to emulsification and viscosity reduction treatment. The synthetic process of the method is simple and easy to control, the obtained viscosity reducer can be used alone and does not need to be compounded and used together with other additives, and the viscosity reducer is excellent in comprehensive performance, green and environmentally friendly.

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 heavy oil viscosity reducer as well as a preparation method and an application thereof, and belongs to the technical field of heavy oil recovery. The heavy oil viscosity reducer is prepared from components in percentage by weight as follows: 2.5%-6.5% of dodecyl dimethyl benzyl ammonium chloride, 2.4%-3.4% of isopropanol, 0.31%-6.7% of nonylphenoxypoly(ethyleneoxy)ethanol,2%-5.81% of 2-butoxyethanol, 1%-3% of EDTA-2Na, 4%-7% of 2-(2-[4-(1,1,3,3-tetramethylbutyl)phenoxy]ethoxy)ethanol and the balance of water. The heavy oil viscosity reducer has good solubility in water, a formed viscosity reducing solution is transparent, good in resistance to high temperature and high in viscosity reduction rate at low and high temperature, and the application range is wide.

The invention provides lignosulfonate for drilling fluid and a lignosulfonate preparation method. The lignosulfonate is obtained by mixed reaction of a complexing agent and sodium lignin sulfonate prepared from liquid glucose. By selection of special sodium salt of lignosulfonate and taking of the sodium lignin sulfonate prepared from liquid glucose as a starting material, the prepared lignosulfonate for drilling fluid has an excellent mud property no matter at the normal temperature or the high temperature, and generation of harmful waste residues in a preparation process is avoided.

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.

The invention provides iron-chromium sodium lignin sulfonate and a preparation method thereof. Sodium lignin sulfonate prepared through a sulfate method, a sugar solution and a complexing agent are mixed for a reaction, and the iron-chromium sodium lignin sulfonate can be obtained, wherein sodium salt in specific lignosulfonate is selected, mixtures of the sugar solution and the sodium lignin sulfonate prepared through the sulfate method serve as initial raw materials, and the prepared iron-chromium sodium lignin sulfonate has very good mud property at both normal temperature and high temperature.