CN111019626A - Composite oil displacement agent - Google Patents
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Abstract
The invention relates to a composite oil displacement agent, and belongs to the technical field of crude oil exploitation. According to the invention, the diatomite and the dimer fatty acid are subjected to in-situ polymerization and mechanical blending, so that the adsorption effect on oily components is provided, the molecular chain movement is weakened, the stability in the oil displacement process is improved, the temperature resistance and the interface stability of the oil displacement agent can be effectively improved, and the viscosity of thick oil is reduced; lignite and metakaolin are treated, and a mixed monomer is grafted, so that the interfacial tension between the oil displacement agent and the crude oil is reduced and the oil washing capacity of the oil displacement agent is improved through the synergistic effect of various raw materials. The invention solves the defects of poor temperature resistance, poor interface stability and the like of the conventional oil displacement agent and solves the problem of unobvious viscosity reduction effect on thick oil.
Description
Technical Field
The invention relates to a composite oil displacement agent, and belongs to the technical field of crude oil exploitation.
Background
In recent years, with the rising demand for petroleum and the decreasing production of conventional crude oil, the development of thick oil is going into the market year by year. In order to improve the recovery ratio of the thickened oil, steam flooding becomes a thickened oil thermal recovery technology for large-scale industrial application at home and abroad. The characteristics of deep burial, high steam injection pressure, low dryness, wide hot water area and the like of the heavy oil reservoir seriously affect the oil displacement effect of steam flooding, so that corresponding technical attack must be carried out, and chemical auxiliary steam flooding is researched to further improve the application effect of the steam flooding and achieve the aim of greatly improving the recovery ratio. The steam flooding development has high requirement on the temperature resistance of the oil displacement agent, the steam wave and the temperature range is 100-220 ℃, and the temperature field of the steam is about 150m of the radius along the steam injection well, so the oil displacement agent has to resist high temperature and the interface performance does not change in a longer high-temperature time limit; the steam flooding process has higher requirement on the interfacial performance of the oil displacement agent, and when the temperature of an oil reservoir rises and the viscous force is greatly reduced, how to reduce the capillary force becomes a key for influencing the exploitation effect, so that the reduction of the saturation of the residual oil, namely the reduction of the interfacial tension, is a problem which needs to be solved urgently at present. Therefore, aiming at the main contradiction that the low oil washing efficiency under the high-temperature condition affects the steam flooding development, the development of the oil displacement agent system with high temperature resistance and high interfacial activity is the key for further improving the steam flooding development effect.
At present, among oil displacement surfactants commonly used in oil fields, documents report and actually apply more nonionic surfactants, anionic surfactants, amphoteric surfactants, gemini surfactants and compounds among the surfactants, although the oil displacement effect is good, the defects of poor temperature resistance, poor formation stability, poor interface performance, high price and the like still exist, and the viscosity reduction capability and the oil washing capability of most oil displacement agents on thick oil are not obvious, for example, WO00/37775 discloses a method for oil extraction by adopting a specific class of alkylaryl sulfonate surfactants, wherein the surfactant is obtained by sulfonating α -olefin material with the average carbon atom number of 12-58 in wide distribution after reacting with aromatic raw materials, the surfactant has high solubilization effect on crude oil, particularly wax-containing crude oil and can form an interface with ultra-low interfacial tension with the crude oil, but the temperature resistance and the effect on the thick oil are not mentioned, CN102002354A reports an oil-water interfacial tension agent, the anionic surfactant comprises a zwitterionic surfactant and a polyoxyethylene surfactant with a high anionic surfactant and a branched chain surfactant with a high alkali ion-containing surfactant, and the surfactant is a polyoxyethylene surfactant capable of reducing the loss of forming a non-anionic surfactant with a high anionic surfactant and a polyoxyethylene-branched chain surfactant under the condition of reducing the surfactant of a high anionic surfactant of a high alkali ion in the surfactant of an oil displacement agent, wherein the surfactant is a high anion-containing a polyoxyethylene surfactant with a very low oil displacement agent under the ultra-alkaline surfactant and a very low interfacial tension of a very low temperature, and a very low alkali-alkali surfactant, and the surfactant containing a very low ionic surfactant capable of reducing the surfactant of a very low interfacial tension of a very low ionic surfactant of a very low molecular weight, and a very low molecular weight of a very low molecular weight, and a very low molecular weight of a very low molecular weight, which is.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the defects of poor temperature resistance, poor interface stability and the like of the conventional common oil displacement agent and the problem that the viscosity reduction effect on the thick oil is not obvious, the composite oil displacement agent is provided.
In order to solve the technical problems, the invention adopts the following technical scheme:
the composite oil displacement agent comprises the following components in parts by weight: 5~8 parts of glyoxal, 6~10 parts of glycerin, 1~4 parts of sodium citrate, 2~5 parts of emulsifier, 20~40 parts of water, still include: 30-50 parts of composite oil displacement base stock and 15-25 parts of composite interface stabilizer.
The preparation method of the composite oil displacement base material comprises the following steps:
(1) taking 12-20 parts of kieselguhr, 4-8 parts of dimer fatty acid, 3-6 parts of hydroquinone, 5-9 parts of phthalic anhydride and 30-50 parts of 1, 2-propylene glycol, sealing and mixing, introducing nitrogen for protection, heating to 150-170 ℃, carrying out heat preservation and stirring, cooling to 110-130 ℃, adding maleic anhydride accounting for 4-8% of the weight of the kieselguhr, carrying out heat preservation and mixing, heating to 160-170 ℃, carrying out vacuum pumping treatment to obtain a reaction material, taking 25-45 parts of the reaction material, 2-5 parts of hydroquinone, 5-8 parts of styrene, 3-7 parts of acrylic acid, 0.1-0.3 part of catalyst and 18-37 parts of methyl ethyl ketone peroxide, mixing, stirring, heating to 70-85 ℃, carrying out heat preservation and standing to obtain a treated material;
(2) according to the mass parts, 20-45 parts of treatment material, 6-10 parts of modified fiber material, 2-5 parts of castor oil, 3-6 parts of additive, 1-2 parts of auxiliary material, 4-8 parts of polylactic acid, 0.2-0.5 part of bentonite and 25-45 parts of water are taken, the treatment material, the castor oil, the auxiliary material, the bentonite and the water are taken for mixing and stirring at the temperature of 35-50 ℃, the modified fiber material, the additive and the polylactic acid are added for mixing, shearing and dispersing, and reduced pressure evaporation is carried out, so as to obtain the composite oil displacement base material.
The catalyst in the step (1): according to the mass ratio of 3-7: 1, mixing the cobalt naphthenate and the ferrocene to obtain the catalyst.
The modified fiber material in the step (2): according to the mass parts, 10-15 parts of bamboo nano cellulose, 0.2-0.5 part of silane coupling agent KH-550, 1-2 parts of potassium bromide and 35-50 parts of acetic acid solution are mixed and stirred, subjected to suction filtration, and filter residues are collected and dried to obtain the modified fiber material.
The auxiliary materials in the step (2) are as follows: according to the mass ratio of 2-5: 1 mixing starch and silicon dioxide to obtain the auxiliary material.
The additive in the step (2): according to the mass ratio of 1: 3-7: 0.1 mixing ethyl acetate, glyceryl triphosphate and magnesium stearate to obtain the additive.
Preparing the composite interface stabilizing material: at the temperature of 30-50 ℃, according to the mass ratio of 3: 1: 7-13 mixing and stirring lignite, metakaolin and a NaOH solution, and concentrating under reduced pressure to obtain a concentrated solution, wherein the mass ratio of the concentrated solution is 18-30: 8: 0.01 taking the monomer liquid, the concentrated solution and potassium persulfate to mix and stir to obtain a mixed material, and taking the mixed material according to the mass ratio of 15-25: 3: 1, adding sodium humate and a regulator, mixing, stirring at the temperature of 70-85 ℃, filtering, collecting filter cakes, freeze-drying, and collecting freeze-dried substances according to the mass ratio of 7-12: 2: 1, adding soybean and yolk, mixing and stirring to obtain a mixture, adding water which is 2-4 times of the mass of the mixture into the mixture, introducing sulfur dioxide with the volume of 8-14% of the water, sealing at 30-45 ℃, standing and soaking, discharging, and grinding to obtain the composite interface stabilizer.
The monomer liquid: according to the mass parts, 7-13 parts of acrylic acid, 5-9 parts of methyl methacrylate, 10-15 parts of acryloyloxy butyl sulfonic acid and 30-50 parts of NaOH solution are mixed to obtain the monomer liquid.
The regulator is: according to the mass ratio of 5-8: 1 mixing pentaerythritol and sodium dodecyl benzene sulfonate to obtain the regulator.
The emulsifier is as follows: according to the mass ratio of 4-7: and 3, mixing Tween-80 and Span-40 to obtain the emulsifier.
Compared with other methods, the method has the beneficial technical effects that:
(1) the invention combines diatomite and dimeric fatty acid to prepare a hybrid material through an in-situ polymerization method and mechanical blending, has good surface activity, is easy to combine with a high molecular chain segment, has larger self-strength, can provide good stability, can counteract partial viscous resistance by means of interface dispersion stress when being subjected to the cold and hot action of external action, plays the roles of viscosity reduction and reinforcement, can react with carboxyl in polyester to form covalent bonds in the in-situ polymerization process, ensures that the oil displacement effect is more uniform, forms a highly crosslinked network structure, can provide the combination effect of close hydrogen bonds and van der Waals force after oil displacement is finished, and can not effectively transfer load into the diatomite component from a polymer matrix after being subjected to external stress, thereby obtaining better mechanical property, a large amount of diatomite is also agglomerated to cause stress concentration, and can generate an adsorption effect on oleophylic components, so that the movement of a molecular chain is weakened, the chain accumulation efficiency is reduced, the stability in the oil displacement process is improved, the temperature resistance and the interface stability of the oil displacement agent can be effectively improved, and the viscosity of thick oil is reduced;
(2) the lignite and metakaolin are treated, the mixed monomer is grafted, the interfacial tension between the oil displacement agent and the crude oil is reduced through the synergistic effect of various raw materials, the oil washing capacity of the oil displacement agent is improved, the crude oil is emulsified, the wettability of pores of an oil layer is improved, and the microscopic oil displacement efficiency is improved;
(3) according to the invention, the diatomite and the dimer fatty acid are subjected to in-situ polymerization and mechanical blending, so that the adsorption effect on oily components is provided, the molecular chain movement is weakened, the stability in the oil displacement process is improved, the temperature resistance and the interface stability of the oil displacement agent can be effectively improved, and the viscosity of thick oil is reduced; the method is used for treating the lignite and the metakaolin, grafting the mixed monomer, reducing the interfacial tension between the oil displacement agent and the crude oil and improving the oil washing capacity of the oil displacement agent through the synergistic effect of various raw materials.
Detailed Description
Auxiliary materials: according to the mass ratio of 2-5: 1 mixing starch and silicon dioxide to obtain the auxiliary material.
Additive: according to the mass ratio of 1: 3-7: 0.1 mixing ethyl acetate, glyceryl triphosphate and magnesium stearate to obtain the additive.
Catalyst: according to the mass ratio of 3-7: 1, mixing the cobalt naphthenate and the ferrocene to obtain the catalyst.
Modified fiber material: according to the mass parts, 10-15 parts of bamboo nano cellulose, 0.2-0.5 part of silane coupling agent KH-550, 1-2 parts of potassium bromide and 35-50 parts of 15% acetic acid solution are mixed and stirred for 35-60 min, and then the mixture is subjected to suction filtration, and filter residue is collected and dried at 65-80 ℃ to obtain the modified fiber material.
Emulsifier: according to the mass ratio of 4-7: and 3, mixing Tween-80 and Span-40 to obtain the emulsifier.
Monomer liquid: according to the mass parts, 7-13 parts of acrylic acid, 5-9 parts of methyl methacrylate, 10-15 parts of acryloyloxybutylsulfonic acid and 30-50 parts of NaOH solution with the mass fraction of 15% are mixed to obtain the monomer liquid.
A regulator: according to the mass ratio of 5-8: 1 mixing pentaerythritol and sodium dodecyl benzene sulfonate to obtain the regulator.
The preparation method of the composite oil displacement base material comprises the following steps:
(1) taking 12-20 parts of kieselguhr, 4-8 parts of dimer fatty acid, 3-6 parts of hydroquinone, 5-9 parts of phthalic anhydride and 30-50 parts of 1, 2-propylene glycol, sealing and mixing in a reaction kettle at 30-45 ℃ according to the mass parts, introducing nitrogen for protection, heating to 150-170 ℃, carrying out heat preservation and stirring for 25-45 min, cooling to 110-130 ℃, adding maleic anhydride accounting for 4-8% of the mass of the kieselguhr, carrying out heat preservation and mixing for 20-40 min, heating to 160-170 ℃, carrying out vacuum pumping treatment for 2-4 h to obtain a reaction material, taking 25-45 parts of the reaction material, 2-5 parts of hydroquinone, 5-8 parts of styrene, 3-7 parts of acrylic acid, 0.1-0.3 part of catalyst and 18-37 parts of peroxide according to the mass parts, mixing in the reaction kettle at 35-50 ℃, carrying out magnetic stirring for 1-3 h at 350-550 r/min, heating to 70-85 ℃ and standing for 2-4 h, obtaining a processing material;
(2) according to the mass parts, 20-45 parts of treatment material, 6-10 parts of modified fiber material, 2-5 parts of castor oil, 3-6 parts of additive, 1-2 parts of auxiliary material, 4-8 parts of polylactic acid, 0.2-0.5 part of bentonite and 25-45 parts of water are taken, the treatment material, the castor oil, the auxiliary material, the bentonite and the water are taken and mixed in a reaction kettle at the temperature of 35-50 ℃, the mixture is magnetically stirred for 35-60 min at 400-700 r/min, then the modified fiber material, the additive and the polylactic acid are added and mixed, the mixture is sheared and dispersed for 12-20 min at 3000-4000 r/min, and the mixture is decompressed and evaporated to constant weight, so that the composite flooding base material is obtained.
Preparing a composite interface stabilizing material: at the temperature of 30-50 ℃, according to the mass ratio of 3: 1: 7-13 mixing lignite, metakaolin and a NaOH solution with the mass fraction of 15%, magnetically stirring for 2-4 hours at a speed of 350-550 r/min, and concentrating under reduced pressure to 25-40% of the original volume to obtain a concentrated solution, wherein the concentrated solution is prepared from the following raw materials in a mass ratio of 18-30: 8: 0.01 taking the monomer liquid, the concentrated solution and potassium persulfate to mix, magnetically stirring for 40-60 min at a speed of 400-700 r/min to obtain a mixed material, and taking the mixed material according to a mass ratio of 15-25: 3: 1, adding sodium humate and a regulator, mixing, stirring for 30-50 min at the temperature of 70-85 ℃, filtering, collecting a filter cake, drying for 4-8 h in a freeze dryer, and collecting a freeze-dried substance according to the mass ratio of 7-12: 2: 1, adding soybean and yolk, mixing and stirring for 25-45 min to obtain a mixture, putting the mixture into a ceramic jar, adding water which is 2-4 times of the mass of the mixture, introducing sulfur dioxide with the volume of 8-14% of the water, sealing the ceramic jar at 30-45 ℃, standing and soaking for 2-4 days, discharging, and grinding for 2-4 h to obtain the composite interfacial stabilizer.
The composite oil displacement agent comprises the following components in parts by weight: 5-8 parts of glyoxal, 6-10 parts of glycerol, 1-4 parts of sodium citrate, 2-5 parts of emulsifier, 20-40 parts of water, 30-50 parts of composite oil displacement base stock and 15-25 parts of composite interface stabilizer.
Example 1
Auxiliary materials: according to the mass ratio of 2: 1 mixing starch and silicon dioxide to obtain the auxiliary material.
Additive: according to the mass ratio of 1: 3: 0.1 mixing ethyl acetate, glyceryl triphosphate and magnesium stearate to obtain the additive.
Catalyst: according to the mass ratio of 3: 1, mixing the cobalt naphthenate and the ferrocene to obtain the catalyst.
Modified fiber material: according to the mass parts, 10 parts of bamboo nano cellulose, 0.2 part of silane coupling agent KH-550, 1 part of potassium bromide and 35 parts of acetic acid solution with the mass fraction of 15% are mixed and stirred for 35min, and then the mixture is subjected to suction filtration, and filter residue is collected and dried at 65 ℃ to obtain the modified fiber material.
Emulsifier: according to the mass ratio of 4: and 3, mixing Tween-80 and Span-40 to obtain the emulsifier.
Monomer liquid: according to the mass parts, 7 parts of acrylic acid, 5 parts of methyl methacrylate, 10 parts of acryloyloxybutylsulfonic acid and 30 parts of NaOH solution with the mass fraction of 15% are mixed to obtain the monomer liquid.
A regulator: according to the mass ratio of 5: 1 mixing pentaerythritol and sodium dodecyl benzene sulfonate to obtain the regulator.
The preparation method of the composite oil displacement base material comprises the following steps:
(1) taking 12 parts of diatomite, 4 parts of dimer fatty acid, 3 parts of hydroquinone, 5 parts of phthalic anhydride and 30 parts of 1, 2-propylene glycol at 30 ℃, sealing and mixing the diatomite, the hydroquinone, the phthalic anhydride and the 1, 2-propylene glycol in a reaction kettle, introducing nitrogen for protection, heating to 150 ℃, keeping the temperature and stirring for 25min, cooling to 110 ℃, adding maleic anhydride accounting for 4 percent of the diatomite by mass, keeping the temperature and mixing for 20min, heating to 160 ℃, vacuumizing for 2h to obtain a reaction material, taking 25 parts of the reaction material, 2 parts of hydroquinone, 5 parts of styrene, 3 parts of acrylic acid, 0.1 part of catalyst and 18 parts of methyl ethyl ketone peroxide by mass, mixing the reaction material, magnetically stirring for 1h at 35 ℃ at 350r/min, heating to 70 ℃, keeping the temperature and standing for 2h to obtain a treatment material;
(2) according to the mass parts, 20 parts of treatment material, 6 parts of modified fiber material, 2 parts of castor oil, 3 parts of additive, 1 part of auxiliary material, 4 parts of polylactic acid, 0.2 part of bentonite and 25 parts of water are taken, the treatment material, the castor oil, the auxiliary material, the bentonite and the water are mixed in a reaction kettle at the temperature of 35 ℃, the mixture is magnetically stirred for 35min at the speed of 400r/min, then the modified fiber material, the additive and the polylactic acid are added for mixing, the mixture is sheared and dispersed for 12min at the speed of 3000r/min, and the mixture is decompressed and evaporated to constant weight, so that the composite oil displacement base material is obtained.
Preparing a composite interface stabilizing material: at 30 ℃, according to the mass ratio of 3: 1: and 7, mixing lignite, metakaolin and a NaOH solution with the mass fraction of 15%, magnetically stirring for 2 hours at the speed of 350r/min, and concentrating under reduced pressure to 25% of the original volume to obtain a concentrated solution, wherein the concentrated solution is prepared from the following raw materials in percentage by mass: 8: 0.01 taking the monomer liquid, the concentrated solution and potassium persulfate to mix, magnetically stirring for 40min at the speed of 400r/min to obtain a mixed material, and taking the mixed material according to the mass ratio of 15: 3: 1, adding sodium humate and a regulator, mixing, keeping the temperature at 70 ℃, stirring for 30min, filtering, collecting a filter cake, drying for 4h in a freeze dryer, and collecting a freeze-dried substance according to a mass ratio of 7: 2: 1 adding soybean and yolk, mixing and stirring for 25min to obtain a mixture, putting the mixture into a ceramic jar, adding water with the mass 2 times of that of the mixture, introducing sulfur dioxide with the volume of 8% of that of the water, sealing the ceramic jar at 30 ℃, standing and soaking for 2 days, discharging, and grinding for 2h to obtain the composite interfacial stabilizer.
The composite oil displacement agent comprises the following components in parts by weight: 5 parts of glyoxal, 6 parts of glycerol, 1 part of sodium citrate, 2 parts of emulsifier, 20 parts of water, 30 parts of composite oil displacement base stock and 15 parts of composite interface stabilizer.
Example 2
Auxiliary materials: according to the mass ratio of 5: 1 mixing starch and silicon dioxide to obtain the auxiliary material.
Additive: according to the mass ratio of 1: 7: 0.1 mixing ethyl acetate, glyceryl triphosphate and magnesium stearate to obtain the additive.
Catalyst: according to the mass ratio of 7: 1, mixing the cobalt naphthenate and the ferrocene to obtain the catalyst.
Modified fiber material: according to the mass parts, 15 parts of bamboo nano cellulose, 0.5 part of silane coupling agent KH-550, 2 parts of potassium bromide and 50 parts of acetic acid solution with the mass fraction of 15% are mixed and stirred for 60min, and then the mixture is subjected to suction filtration, and filter residue is collected and dried at the temperature of 80 ℃ to obtain the modified fiber material.
Emulsifier: according to the mass ratio of 7: and 3, mixing Tween-80 and Span-40 to obtain the emulsifier.
Monomer liquid: according to the mass parts, 13 parts of acrylic acid, 9 parts of methyl methacrylate, 15 parts of acryloyloxybutylsulfonic acid and 50 parts of NaOH solution with the mass fraction of 15% are mixed to obtain the monomer liquid.
A regulator: according to the mass ratio of 8: 1 mixing pentaerythritol and sodium dodecyl benzene sulfonate to obtain the regulator.
The preparation method of the composite oil displacement base material comprises the following steps:
(1) taking 20 parts of diatomite, 8 parts of dimer fatty acid, 6 parts of hydroquinone, 9 parts of phthalic anhydride and 50 parts of 1, 2-propylene glycol at 45 ℃, sealing and mixing the diatomite, the hydroquinone, the phthalic anhydride and the 1, 2-propylene glycol in a reaction kettle, introducing nitrogen for protection, heating to 170 ℃, keeping the temperature and stirring for 45min, cooling to 130 ℃, adding maleic anhydride accounting for 8 percent of the diatomite by mass, keeping the temperature and mixing for 40min, heating to 170 ℃, vacuumizing for 4h to obtain a reaction material, taking 45 parts of the reaction material, 5 parts of hydroquinone, 8 parts of styrene, 7 parts of acrylic acid, 0.3 part of catalyst and 37 parts of methyl ethyl ketone peroxide by mass, mixing the reaction material in the reaction kettle, magnetically stirring for 3h at 50 ℃ at 550r/min, heating to 85 ℃, keeping the temperature and standing for 4h to obtain a treatment material;
(2) according to the mass parts, 45 parts of treatment material, 10 parts of modified fiber material, 5 parts of castor oil, 6 parts of additive, 2 parts of auxiliary material, 8 parts of polylactic acid, 0.5 part of bentonite and 45 parts of water are taken, the treatment material, the castor oil, the auxiliary material, the bentonite and the water are mixed in a reaction kettle at the temperature of 50 ℃, the mixture is magnetically stirred for 60min at 700r/min, then the modified fiber material, the additive and the polylactic acid are added for mixing, the mixture is sheared and dispersed for 20min at 4000r/min, and the mixture is decompressed and evaporated to constant weight, so that the composite oil displacement base material is obtained.
Preparing a composite interface stabilizing material: at 50 ℃, according to the mass ratio of 3: 1: mixing lignite, metakaolin and a NaOH solution with the mass fraction of 15%, magnetically stirring for 4 hours at 550r/min, and concentrating under reduced pressure to 40% of the original volume to obtain a concentrated solution, wherein the concentrated solution is prepared from the following raw materials in percentage by mass of 30: 8: 0.01 taking the monomer liquid, the concentrated solution and potassium persulfate to mix, magnetically stirring for 60min at the speed of 700r/min to obtain a mixed material, and taking the mixed material according to the mass ratio of 25: 3: 1, adding sodium humate and a regulator, mixing, keeping the temperature at 85 ℃, stirring for 50min, filtering, collecting a filter cake, drying for 8h in a freeze dryer, and collecting a freeze-dried substance according to a mass ratio of 12: 2: 1 adding soybean and yolk, mixing and stirring for 45min to obtain a mixture, putting the mixture into a ceramic jar, adding water with the mass 4 times of that of the mixture, introducing sulfur dioxide with the volume of 14% of that of the water, sealing the ceramic jar at 45 ℃, standing and soaking for 4 days, discharging, and grinding for 4h to obtain the composite interfacial stabilizer.
The composite oil displacement agent comprises the following components in parts by weight: 8 parts of glyoxal, 10 parts of glycerol, 4 parts of sodium citrate, 5 parts of emulsifier, 40 parts of water, 50 parts of composite oil displacement base stock and 25 parts of composite interface stabilizer.
Example 3
Auxiliary materials: according to the mass ratio of 3: 1 mixing starch and silicon dioxide to obtain the auxiliary material.
Additive: according to the mass ratio of 1: 5: 0.1 mixing ethyl acetate, glyceryl triphosphate and magnesium stearate to obtain the additive.
Catalyst: according to the mass ratio of 5: 1, mixing the cobalt naphthenate and the ferrocene to obtain the catalyst.
Modified fiber material: according to the mass parts, 12 parts of bamboo nano cellulose, 0.3 part of silane coupling agent KH-550, 1.5 parts of potassium bromide and 40 parts of acetic acid solution with the mass fraction of 15% are mixed and stirred for 50min, and then the mixture is subjected to suction filtration, and filter residues are collected and dried at 70 ℃ to obtain the modified fiber material.
Emulsifier: according to the mass ratio of 5: and 3, mixing Tween-80 and Span-40 to obtain the emulsifier.
Monomer liquid: according to the mass parts, 10 parts of acrylic acid, 8 parts of methyl methacrylate, 12 parts of acryloyloxybutylsulfonic acid and 40 parts of NaOH solution with the mass fraction of 15% are mixed to obtain the monomer liquid.
A regulator: according to the mass ratio of 7: 1 mixing pentaerythritol and sodium dodecyl benzene sulfonate to obtain the regulator.
The preparation method of the composite oil displacement base material comprises the following steps:
(1) taking 15 parts of diatomite, 6 parts of dimer fatty acid, 5 parts of hydroquinone, 7 parts of phthalic anhydride and 40 parts of 1, 2-propylene glycol at 35 ℃, sealing and mixing the diatomite, 6 parts of dimer fatty acid, 5 parts of hydroquinone, 7 parts of phthalic anhydride and 40 parts of 1, 2-propylene glycol in a reaction kettle, introducing nitrogen for protection, heating to 160 ℃, keeping the temperature and stirring for 35min, cooling to 120 ℃, adding maleic anhydride accounting for 6 percent of the diatomite, keeping the temperature and mixing for 30min, heating to 165 ℃, vacuumizing for 3h to obtain a reaction material, taking 35 parts of the reaction material, 3 parts of hydroquinone, 7 parts of styrene, 5 parts of acrylic acid, 0.2 part of a catalyst and 27 parts of methyl ethyl ketone peroxide, mixing the reaction material in parts by mass in the reaction kettle, magnetically stirring for 2h at 40 ℃ at 450r/min, heating to 75 ℃, keeping the temperature and standing for 3h to;
(2) according to the mass parts, 35 parts of treatment material, 8 parts of modified fiber material, 3 parts of castor oil, 5 parts of additive, 1.5 parts of auxiliary material, 6 parts of polylactic acid, 0.3 part of bentonite and 35 parts of water are taken, the treatment material, the castor oil, the auxiliary material, the bentonite and the water are mixed in a reaction kettle at the temperature of 40 ℃, the mixture is magnetically stirred for 50min at the speed of 500r/min, then the modified fiber material, the additive and the polylactic acid are added for mixing, the mixture is sheared and dispersed for 15min at the speed of 3500r/min, and the mixture is decompressed and evaporated to constant weight, thus obtaining the composite flooding base material.
Preparing a composite interface stabilizing material: at 40 ℃, according to the mass ratio of 3: 1: 10, mixing lignite, metakaolin and a NaOH solution with the mass fraction of 15%, magnetically stirring for 3 hours at the speed of 450r/min, and concentrating under reduced pressure to 30% of the original volume to obtain a concentrated solution, wherein the concentrated solution is prepared from the following raw materials in percentage by mass: 8: 0.01 taking the monomer liquid, the concentrated solution and potassium persulfate to mix, magnetically stirring for 50min at the speed of 600r/min to obtain a mixed material, and taking the mixed material according to the mass ratio of 20: 3: 1, adding sodium humate and a regulator, mixing, keeping the temperature at 75 ℃, stirring for 40min, filtering, collecting a filter cake, drying for 6h in a freeze dryer, and collecting a freeze-dried substance according to a mass ratio of 10: 2: 1 adding soybean and yolk, mixing and stirring for 35min to obtain a mixture, putting the mixture into a ceramic jar, adding water with the mass 3 times of that of the mixture, introducing sulfur dioxide with the volume of 10% of that of the water, sealing the ceramic jar at 35 ℃, standing and soaking for 3 days, discharging, and grinding for 3h to obtain the composite interfacial stability material.
The composite oil displacement agent comprises the following components in parts by weight: 7 parts of glyoxal, 8 parts of glycerol, 3 parts of sodium citrate, 3 parts of emulsifier, 30 parts of water, 40 parts of composite oil displacement base stock and 20 parts of composite interface stabilizer.
Comparative example 1: the preparation was essentially the same as in example 1, except that complex flooding base was absent.
Comparative example 2: essentially the same procedure as in example 1, except that the composite interfacial stabilizer is absent.
Comparative example 3: a compound oil displacement agent produced by a certain company in Shanghai city. (Main Components: Compound of heavy alkylbenzene sulfonate and nitrogen-containing surfactant and Low carbon alcohol)
The composite oil displacement agent obtained in the above embodiment and comparative example is detected, 100g of thick oil is weighed, 50g of 1.5% oil displacement agent solution is added, after stirring for 5 minutes at 80 ℃, the viscosity of emulsified thick oil is tested by a Hakke VT550 type rotational viscometer (100 r/m), and the oil-water interfacial tension and temperature resistance at 50 ℃ are measured by a rotating drop interfacial tension meter: the oil displacement agents prepared in the examples and the comparative examples are taken as samples respectively, placed in a thermostat at 95 ℃, observed for 21 days, and the temperature resistance stability of the oil displacement agents is represented by the water evolution rate (FV) and the stability Score (SV). Wherein FV = V1/V2 × 100%; SV = Sigma Ki [1-fvi ] in the formula, wherein FV is water precipitation rate and unit is percent; SV is stability score; v1 is the volume of water separated out in a certain period of time, and the unit is mL; v2 is the volume of active water added in the preparation of the emulsifier solution, and the unit is mL; ki is the weighting coefficient. The corresponding standing time of the samples is respectively 30min, Ki is respectively 1-6, SV is more than 0 and less than 21, the calculated SV value is larger, the stability of the emulsion is better, the temperature resistance is better, a certain amount of thickened oil, petroleum asphalt and full refined wax are weighed, the oil stain is prepared after being dissolved and mixed uniformly, petroleum ether with the temperature of 30-60 ℃ is used for dissolving the oil stain, the oil stain is mixed with quartz sand, the petroleum ether is evaporated to obtain oil sand, then the oil sand is cleaned by 0.3% of oil displacement agent solution, the oil sand is subjected to purple test, the oil washing rate is calculated, the use standard is Q/SH10201518-2006, and the obtained result is shown in Table 1.
Table 1:
| detecting items | Example 1 | Example 2 | Example 3 | Comparative example1 | Comparative example 2 | Comparative example 3 |
| Interfacial tension/mN/m | 9×102 | 8×102 | 8×102 | 6×102 | 4×102 | 3×102 |
| viscosity/mPa.s | 40 | 41 | 43 | 68 | 89 | 130 |
| Temperature resistance (SV value) | 21 | 20 | 20 | 18 | 16 | 9 |
| Oil washout per% | 95.6 | 95.2 | 95.4 | 90.3 | 88.1 | 78.9 |
In summary, it can be seen from table 1 that the composite oil displacement agent of the present invention is more effective and is worth popularizing, and the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The composite oil displacement agent comprises the following components in parts by weight: 5~8 parts of glyoxal, 6~10 parts of glycerin, 1~4 parts of sodium citrate, 2~5 parts of emulsifier, 20~40 parts of water, its characterized in that still includes: 30-50 parts of composite oil displacement base stock and 15-25 parts of composite interface stabilizer.
2. The composite oil-displacing agent of claim 1, wherein the preparation method of the composite oil-displacing base stock comprises the following steps:
(1) taking 12-20 parts of kieselguhr, 4-8 parts of dimer fatty acid, 3-6 parts of hydroquinone, 5-9 parts of phthalic anhydride and 30-50 parts of 1, 2-propylene glycol, sealing and mixing, introducing nitrogen for protection, heating to 150-170 ℃, carrying out heat preservation and stirring, cooling to 110-130 ℃, adding maleic anhydride accounting for 4-8% of the weight of the kieselguhr, carrying out heat preservation and mixing, heating to 160-170 ℃, carrying out vacuum pumping treatment to obtain a reaction material, taking 25-45 parts of the reaction material, 2-5 parts of hydroquinone, 5-8 parts of styrene, 3-7 parts of acrylic acid, 0.1-0.3 part of catalyst and 18-37 parts of methyl ethyl ketone peroxide, mixing, stirring, heating to 70-85 ℃, carrying out heat preservation and standing to obtain a treated material;
(2) according to the mass parts, 20-45 parts of treatment material, 6-10 parts of modified fiber material, 2-5 parts of castor oil, 3-6 parts of additive, 1-2 parts of auxiliary material, 4-8 parts of polylactic acid, 0.2-0.5 part of bentonite and 25-45 parts of water are taken, the treatment material, the castor oil, the auxiliary material, the bentonite and the water are taken for mixing and stirring at the temperature of 35-50 ℃, the modified fiber material, the additive and the polylactic acid are added for mixing, shearing and dispersing, and reduced pressure evaporation is carried out, so as to obtain the composite oil displacement base material.
3. The composite oil-displacing agent according to claim 2, wherein the catalyst in step (1): according to the mass ratio of 3-7: 1, mixing the cobalt naphthenate and the ferrocene to obtain the catalyst.
4. The composite oil-displacing agent according to claim 2, wherein the modified fiber material in the step (2): according to the mass parts, 10-15 parts of bamboo nano cellulose, 0.2-0.5 part of silane coupling agent KH-550, 1-2 parts of potassium bromide and 35-50 parts of acetic acid solution are mixed and stirred, subjected to suction filtration, and filter residues are collected and dried to obtain the modified fiber material.
5. The composite oil displacement agent according to claim 2, wherein the auxiliary materials in the step (2): according to the mass ratio of 2-5: 1 mixing starch and silicon dioxide to obtain the auxiliary material.
6. The composite oil-displacing agent according to claim 2, wherein the additive in step (2): according to the mass ratio of 1: 3-7: 0.1 mixing ethyl acetate, glyceryl triphosphate and magnesium stearate to obtain the additive.
7. The composite oil-displacing agent according to claim 1, wherein the preparation of the composite interfacial stabilizer comprises the following steps: at the temperature of 30-50 ℃, according to the mass ratio of 3: 1: 7-13 mixing and stirring lignite, metakaolin and a NaOH solution, and concentrating under reduced pressure to obtain a concentrated solution, wherein the mass ratio of the concentrated solution is 18-30: 8: 0.01 taking the monomer liquid, the concentrated solution and potassium persulfate to mix and stir to obtain a mixed material, and taking the mixed material according to the mass ratio of 15-25: 3: 1, adding sodium humate and a regulator, mixing, stirring at the temperature of 70-85 ℃, filtering, collecting filter cakes, freeze-drying, and collecting freeze-dried substances according to the mass ratio of 7-12: 2: 1, adding soybean and yolk, mixing and stirring to obtain a mixture, adding water which is 2-4 times of the mass of the mixture into the mixture, introducing sulfur dioxide with the volume of 8-14% of the water, sealing at 30-45 ℃, standing and soaking, discharging, and grinding to obtain the composite interface stabilizer.
8. The composite oil-displacing agent according to claim 7, wherein the monomer fluid: according to the mass parts, 7-13 parts of acrylic acid, 5-9 parts of methyl methacrylate, 10-15 parts of acryloyloxy butyl sulfonic acid and 30-50 parts of NaOH solution are mixed to obtain the monomer liquid.
9. The composite oil-displacing agent according to claim 7, wherein the regulator: according to the mass ratio of 5-8: 1 mixing pentaerythritol and sodium dodecyl benzene sulfonate to obtain the regulator.
10. The composite oil-displacing agent according to claim 1, wherein the emulsifier: according to the mass ratio of 4-7: and 3, mixing Tween-80 and Span-40 to obtain the emulsifier.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112239663A (en) * | 2020-10-19 | 2021-01-19 | 中国石油大学(华东) | Oil-in-water emulsion oil displacement agent based on styrene tar and preparation method and application thereof |
| CN113136194A (en) * | 2021-04-26 | 2021-07-20 | 中国石油大学(华东) | Emulsion based on nanocellulose and preparation method and application thereof |
| CN113861957A (en) * | 2021-11-04 | 2021-12-31 | 中国石油大学(北京) | Double-base nano viscosity reducer and application thereof in heavy oil recovery and recovery method |
| CN116042201A (en) * | 2022-11-29 | 2023-05-02 | 合肥全景泰益新材料科技有限公司 | Temperature-resistant and salt-resistant compound oil displacement agent and preparation method thereof |
-
2019
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112239663A (en) * | 2020-10-19 | 2021-01-19 | 中国石油大学(华东) | Oil-in-water emulsion oil displacement agent based on styrene tar and preparation method and application thereof |
| CN112239663B (en) * | 2020-10-19 | 2022-07-08 | 中国石油大学(华东) | Oil-in-water emulsion oil displacement agent based on styrene tar and preparation method and application thereof |
| CN113136194A (en) * | 2021-04-26 | 2021-07-20 | 中国石油大学(华东) | Emulsion based on nanocellulose and preparation method and application thereof |
| CN113136194B (en) * | 2021-04-26 | 2023-05-02 | 中国石油大学(华东) | Emulsion based on nanocellulose and preparation method and application thereof |
| CN113861957A (en) * | 2021-11-04 | 2021-12-31 | 中国石油大学(北京) | Double-base nano viscosity reducer and application thereof in heavy oil recovery and recovery method |
| CN113861957B (en) * | 2021-11-04 | 2022-09-30 | 中国石油大学(北京) | Double-base nano viscosity reducer and application thereof in heavy oil recovery and recovery method |
| CN116042201A (en) * | 2022-11-29 | 2023-05-02 | 合肥全景泰益新材料科技有限公司 | Temperature-resistant and salt-resistant compound oil displacement agent and preparation method thereof |
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