CN117659980A - Pour point depressing and viscosity reducing oil displacement agent for oil displacement of high pour point oil reservoir, and preparation method and application thereof - Google Patents
Pour point depressing and viscosity reducing oil displacement agent for oil displacement of high pour point oil reservoir, and preparation method and application thereof Download PDFInfo
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- 230000000881 depressing effect Effects 0.000 title claims abstract description 68
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- KKFHAJHLJHVUDM-UHFFFAOYSA-N n-vinylcarbazole Chemical compound C1=CC=C2N(C=C)C3=CC=CC=C3C2=C1 KKFHAJHLJHVUDM-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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Abstract
The invention provides a pour point depressing and viscosity reducing oil displacement agent for oil displacement of a high pour point oil reservoir, and a preparation method and application thereof, and belongs to the field of oilfield chemistry. The invention provides a pour point depressing and viscosity reducing oil displacement agent for oil displacement of a high pour point oil reservoir, which comprises, by mass, 18% -22% of a nano surfactant, 20% -24% of a nonionic surfactant, 15% -20% of a Gemini (Gemini) surfactant, 15% of a mutual solvent and the balance of water. The oil displacement agent can be effectively applied to chemical flooding of high-freezing oil reservoirs with crude oil wax content less than or equal to 40%, solidifying point less than or equal to 55 ℃, stratum water mineralization less than or equal to 100000mg/L and calcium and magnesium ion concentration less than or equal to 2500mg/L, and the oil displacement agent has the advantages of easily purchased raw materials, simple process, low cost and environmental protection.
Description
Technical Field
The invention belongs to the field of oilfield chemistry, and particularly relates to a pour point depressing and viscosity reducing oil displacement agent for oil displacement of a high pour point oil reservoir, and a preparation method and application thereof.
Background
China is the country with the most abundant high-pour-point oil resourcesAt home, the known Chinese high-pour-point oil resource amount can reach 50 multiplied by 10 8 More than ton, accounting for 30-40% of the world high oil condensation resources. The crude oil property of the high pour point oil reservoir has the characteristic of three high, namely high wax content, high solidifying point and high wax precipitation point. The wax content range is 10% -57%, generally 20% -40%; the freezing point is generally 25-59 ℃ and is 67 ℃ at the highest; wax deposition points are typically 40-74 degrees celsius.
At present, over 80% of high-pour-point oil reservoirs are developed by conventional cold water injection, along with continuous development of oil fields, the injection water quantity is continuously increased, the stratum temperature is gradually reduced, a large amount of crude oil is separated out from wax, the phenomena of cold injury and blockage of the reservoir are more and more serious, and the water absorption index of an oil reservoir water injection well is rapidly reduced, so that the reduction of the high-pour-point oil reservoir and the improvement of the high-pour-point oil fluidity are of great significance to the improvement of the recovery ratio of the high-pour-point oil reservoir.
CN 115521768A provides an oil displacement system and method for improving the recovery ratio of crude oil in a high-pour-point oil reservoir, which comprises a microbial oil displacement system and a chemical oil displacement system, wherein the system has obvious functions of pour point depression, viscosity reduction and wax precipitation prevention on crude oil, but has complex process and inconvenient field use. CN 115368884A provides a compound oil displacement system for a high-pour-point oil reservoir, and preparation and application thereof, the system has strong applicability to high pour point oil, the wax content of the high pour point oil is 20-40wt%, and the compound system can reduce the oil-water interfacial tension to be ultra-low. The oil displacement system only emphasizes the capability of reducing the interfacial tension of oil and water, and does not mention the pour point depressing and viscosity depressing performance and other technical indexes of high-pour-point oil. CN 110776607A provides a method for preparing a novel active copolymer high-freezing crude oil displacement agent from rosin amine, alpha-glycidyl methacrylate, N-vinylcarbazole and acrylamide as main raw materials. The copolymer has remarkable pour point depressing and oil displacement capabilities for high-pour-point thickened oil, and the preparation process is reliable. However, the preparation process is complex and has a certain danger, and is not suitable for popularization and application. CN115466607 a provides a microemulsion wax-cleaning and preventing agent, and a preparation method and application thereof, wherein the microemulsion wax-cleaning and preventing agent comprises an oil phase, fatty alcohol ether acid salt, fatty alcohol polyether, fatty acid amide betaine, fatty acid glycol amide, a cosolvent and water, and the microemulsion wax-cleaning and preventing agent has high wax-cleaning rate and surface-surface activity, but the maximum pour point depressing range is only 8 ℃ and does not reach the requirements of a common pour point depressant.
Therefore, aiming at the problems of low productivity, low oil extraction speed and other development effects of the conventional water-driven single well of the high-freezing-point oil reservoir, the development of a novel pour-point-depressing viscosity-depressing oil displacement system suitable for the high-freezing-point oil reservoir is needed, and the system needs to have the functions of pour-depressing viscosity-depressing and efficient displacement and has the characteristics of ultralow interfacial tension and high wash-out rate, so that the recovery ratio of the high-freezing-point oil reservoir is greatly improved.
Disclosure of Invention
The invention provides a pour point depressing and viscosity reducing oil displacement agent for oil displacement of a high-freezing oil reservoir, which can be effectively applied to chemical displacement of the high-freezing oil reservoir, wherein the wax content of crude oil is less than or equal to 40%, the solidifying point is less than or equal to 55 ℃, the mineralization degree of stratum water is less than or equal to 100000mg/L, and the concentration of calcium and magnesium ions is less than or equal to 2500mg/L.
In order to achieve the aim, the invention provides a pour point depressing and viscosity reducing oil displacement agent for oil displacement of a high pour point oil reservoir, which comprises, by mass, 18% -22% of a nano surfactant, 20% -24% of a nonionic surfactant, 15% -20% of a Gemini (Gemini) surfactant, 15% of a mutual solvent and the balance of water.
Preferably, the nano surfactant is a nano surfactant with the code CA601S which is commercially available from Ningbo front and nano technology limited company, and the particle size is less than or equal to 200nm. The nano surfactant has good injectability and has the characteristics of temperature resistance and salt resistance.
Preferably, the nonionic surfactant is cocoyl Monoisopropanolamide (MIPA) obtained from Shanghai Mairen daily chemical company, is an amidation product of coconut oil and monoisopropanolamine, has good emulsifying and decontamination capacities, and has good compatibility and synergistic effect with other surfactants.
Preferably, the Gemini (Gemini) surfactant is selected from the group of surfactants commercially available from Tianjin Hepofil New Material CoThe super wet-360 wetting agent comprises the chemical components of 2,5,8, 11-tetramethyl-6-dodecyne-5, 8-diol polyoxyethylene ether.
Preferably, the mutual solvent is ethyl acetate.
Preferably, when the water-soluble oil-reducing and oil-displacing agent is matched with water with the mineralization degree of 0-100000mg/L and the total concentration of calcium ions and magnesium ions of 0-2500mg/L, the water-soluble oil-displacing agent is tested according to the general technical conditions of Q/SH1020 2871-2021 thick oil-reducing and oil-displacing agent and the condensation point measuring method of GB/T510-2018 petroleum products as corresponding indexes, and the interfacial tension is less than or equal to 3.1 multiplied by 10 -3 mN/m, viscosity-reducing rate is more than or equal to 98.6%, wash oil rate is more than or equal to 50.8%, and pour point depressing amplitude is more than or equal to 16 ℃.
The invention provides a preparation method of a pour point depressing and viscosity reducing oil displacement agent for oil displacement of a high pour point oil reservoir, which comprises the following steps:
adding a nonionic surfactant into a reaction kettle, adding a mutual solvent, stirring uniformly at the temperature of 30-40 ℃, adding water, stirring for 30min, and finally adding a Gemini (Gemini) surfactant and a nano surfactant, and stirring uniformly to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
The invention provides an application of the pour point depressing and viscosity reducing oil displacement agent for high pour point oil reservoir oil displacement according to any technical scheme in chemical flooding of high pour point oil reservoirs, wherein the wax content of crude oil is less than or equal to 40%, the solidifying point is less than or equal to 55 ℃, the mineralization degree of stratum water is 0-100000mg/L, and the calcium and magnesium ion concentration is less than or equal to 2500mg/L.
Preferably, the use concentration of the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir is 0.3%.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the invention provides a pour point depressing and viscosity reducing oil displacement agent for oil displacement of a high pour point oil reservoir, which is mainly compounded by a nano surfactant, a nonionic surfactant and a Gemini surfactant. The three surfactants have strong emulsification on the high-freezing crude oil, can reduce the freezing point of the high-freezing crude oil, have obvious synergistic effect, can reduce the interfacial tension of the high-freezing crude oil to be ultra-low under the condition of proper proportion, increase the capillary number, improve the fluidity of the high-freezing crude oil and improve the oil displacement efficiency.
2. The invention provides a pour point depressing and viscosity reducing oil displacement agent for oil displacement of a high-freezing-point oil reservoir, which is mainly applied to chemical displacement of the high-freezing-point oil reservoir. Although the oil displacement agent can not inhibit the precipitation of wax crystals, the morphology of the wax crystals can be changed, so that the capacity of the wax crystals for forming a three-dimensional network structure is weakened, and the low-temperature fluidity of the high-freezing crude oil is improved. The oil-washing function of the oil-displacing agent is utilized to strip crude oil on stratum sand, reduce the viscosity of the crude oil and facilitate the migration of the crude oil in the stratum, thereby improving the recovery ratio of the crude oil, and being an oil extraction technology with great development potential for the high-freezing-point oil reservoir.
3. The pour point depressing and viscosity reducing oil displacement agent for high pour point oil reservoir oil displacement provided by the invention has the advantages of simple production process, easily purchased raw materials, no harm to the environment and personnel from production to use, meeting the green and environment-friendly requirements, and being beneficial to site construction.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The starting materials in the examples of this application were all commercially available from Ningbofeng nanotechnology Co., ltd, with the code CA601S, cocoyl Monoisopropanolamide (MIPA) from Shanghai Mairen daily chemical Co., ltd, gimeracil (Gemini) surfactantThe super wet-360 wetting agent is purchased from the New Material Co., ltd. Of Tianjin He Pu Fei, and the mutual solvent is a commercial product.
Example 1
240kg of a nonionic surfactant cocoyl Monoisopropanolamide (MIPA) was added to the reactor, followed by 150kg of ethyl acetateStirring the ester at 30-40deg.C, adding 230kg of water, stirring for 30min, and adding 200kgAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 180kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Example 2
Adding 230kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) into a reaction kettle, adding 150kg of ethyl acetate, stirring at 30-40deg.C, adding 250kg of water, stirring for 30min, and adding 180kgAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 190kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Example 3
220kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) is added into a reaction kettle, 150kg of ethyl acetate is added, after uniform stirring at 30-40 ℃, 260kg of water is added, stirring is carried out for 30min, and finally 170kg of water is addedAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 200kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Example 4
Adding 210kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) into a reaction kettle, adding 150kg of ethyl acetate, stirring at 30-40deg.C, adding 270kg of water, stirring for 30min, and adding 160kgAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 210kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Example 5
200kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) is added into a reaction kettle, 150kg of ethyl acetate is added, 280kg of water is added after uniform stirring at 30-40 ℃, stirring is carried out for 30min, and finally 150kg of water is addedAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 220kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
The components and the proportions of the pour point depressing and viscosity depressing oil displacement agent for the oil displacement of the high pour point oil reservoir are determined on the basis of a large number of experiments, and any change can cause disqualification of detection indexes.
Comparative example 1
150kg of ethyl acetate and 470kg of water are added into a reaction kettle, and 200kg of water is added after the mixture is stirred uniformly at the temperature of 30-40 DEG CAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 180kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Comparative example 1 is a pour point depressing and viscosity reducing oil displacing agent for displacing high pour point oil reservoirs obtained by removing the nonionic surfactant cocoyl Monoisopropanolamide (MIPA) from the formulation of example 1, wherein the amount of the nonionic surfactant cocoyl Monoisopropanolamide (MIPA) is made up with water.
Comparative example 2
240kg of nonionic surfactant cocoyl monoisopropanol amide (MIPA) is added into a reaction kettle, 150kg of ethyl acetate is added, after uniform stirring at 30-40 ℃, 430kg of water is added, stirring is carried out for 30min, and finally 180kg of nano surfactant CA601S is added, and after sufficient stirring, the pour point depressing and viscosity reducing oil displacement agent for high pour point oil reservoir oil displacement is obtained.
Comparative example 2 was prepared by removing the formulation of example 1Pour point depressing and viscosity reducing oil displacement agent for oil displacement of high pour point oil reservoir obtained by superwet-360 wetting agent, wherein ∈>The amount of superwet-360 wetting agent was made up with water.
Comparative example 3
Adding 240kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) into a reaction kettle, adding 150kg of ethyl acetate, stirring uniformly at 30-40deg.C, adding 410kg of water, stirring for 30min, and finally adding 200kg of waterAnd (5) fully and uniformly stirring the superwet-360 wetting agent to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Comparative example 3 is a pour point depressing and viscosity reducing oil displacing agent for displacing high pour point oil reservoir obtained by removing nano surfactant CA601S in the formulation of example 1, wherein the amount of nano surfactant CA601S is filled with water.
Comparative example 4
190kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) is added into a reaction kettle, 150kg of ethyl acetate is added, 280kg of water is added after uniform stirring at 30-40 ℃, stirring is carried out for 30min, and finally 200kg of water is addedAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 180kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Comparative example 4 is that the amount of the nonionic surfactant cocoyl Monoisopropanolamide (MIPA) in the formulation of example 1 deviates from the range of 20% -24%, namely 190kg of the nonionic surfactant cocoyl Monoisopropanolamide (MIPA) (19%) is added to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir, and the small amount of the nonionic surfactant cocoyl Monoisopropanolamide (MIPA) is supplemented with water.
Comparative example 5
250kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) is added into a reaction kettle, 150kg of ethyl acetate is added, 220kg of water is added after uniform stirring at 30-40 ℃, stirring is carried out for 30min, and finally 200kg of water is addedAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 180kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Comparative example 5 is a viscosity reducing oil displacement agent for high pour point reservoir oil displacement obtained by adding 250kg of the nonionic surfactant cocoyl Monoisopropanolamide (MIPA) (25%) to the formulation of example 1, wherein the amount of the nonionic surfactant cocoyl Monoisopropanolamide (MIPA) is deviated from the range of 20% -24%.
Comparative example 6
Adding 240kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) into a reaction kettle, adding 150kg of ethyl acetate, stirring uniformly at 30-40deg.C, adding 290kg of water, stirring for 30min, and adding 140kgAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 180kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Comparative example 6 was in the formulation of example 1The superwet-360 wetting agent deviates from the range of 15% -20%, i.e. 140kg +.>Pour point depressing and viscosity reducing oil displacement agent for oil displacement of high pour point oil reservoir obtained by superwet-360 wetting agent (14 percent), little added +.>The amount of superwet-360 wetting agent was made up with water.
Comparative example 7
Adding 240kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) into a reaction kettle, adding 150kg of ethyl acetate, stirring uniformly at 30-40deg.C, adding 220kg of water, stirring for 30min, and finally adding 210kgAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 180kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Comparative example 7 was a formulation of example 1The superwet-360 wetting agent deviates from the range of 15% -20%, i.e. 210kg +.>Pour point depressing and viscosity reducing oil displacement agent for oil displacement of high pour point oil reservoir obtained by superwet-360 wetting agent (21 percent), and added in a plurality of parts>The amount of superwet-360 wetting agent is removed from the amount in water.
Comparative example 8
Adding 240kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) into a reaction kettle, adding 150kg of ethyl acetate, stirring uniformly at 30-40deg.C, adding 240kg of water, stirring for 30min, and finally adding 200kg of waterAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 170kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Comparative example 8 is that the nano surfactant CA601S in the formula of example 1 deviates from the range of 18% -22%, namely 170kg of nano surfactant CA601S (17%) is added to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir, and the small amount of nano surfactant CA601S is filled with water.
Comparative example 9
Adding 240kg of nonionic surfactant cocoyl Monoisopropanolamide (MIPA) into a reaction kettle, adding 150kg of ethyl acetate, stirring uniformly at 30-40deg.C, adding 180kg of water, stirring for 30min, and adding 200kgAnd (3) fully and uniformly stirring the superwet-360 wetting agent and 230kg of nano surfactant CA601S to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
Comparative example 9 is a high pour point depressing and viscosity reducing oil displacing agent for reservoir displacement of high pour point oil obtained by adding 230kg of nano surfactant CA601S (23%) which is a nano surfactant CA601S deviated from the range of 18% -22% in the formulation of example 1, the amount of added nano surfactant CA601S is removed from the amount in water.
Performance testing
The pour point depressing and viscosity reducing oil displacement agent products for oil displacement of the high pour point oil reservoirs prepared in the examples and the comparative examples are prepared to be 0.3% in concentration for performance test, and the test conditions and the test method are as follows:
test conditions:
1. test instrument: the device comprises a Bowler-DV 3T rheometer, a constant-temperature drying oven, a TX-500C type full-range rotary drop interfacial tension measuring instrument, a constant-temperature water bath and a SYD-510G petroleum product low-temperature tester (condensation point tester).
2. Test temperature: formation temperature of a certain area of the victory oil field is 70 ℃.
3. Crude oil for testing: dehydrated crude oil in a certain area of the victory oil field has the wax content of 40 percent and the solidifying point of 55 ℃ and the viscosity of 1578mpa.s at 70 ℃.
4. Test water: water is injected into a certain block of the victory oil field, the mineralization degree is 100000mg/L, and the calcium and magnesium ion concentration is 2500mg/L.
The testing method comprises the following steps:
1. interfacial tension test:
and injecting water into a certain area of the victory oil field to prepare a solution with the mass concentration of 0.3% from the pour point depressing and viscosity reducing oil displacement agent for displacing the oil in the high pour point oil reservoir.
The interfacial tension between the solution and the target block oil sample was measured at 70℃as specified in SY/T5370-2018 at 7.3.4 (rotational speed 5000r/min, density difference calculated as 0.05) and the lowest interfacial tension was recorded.
2. And (3) viscosity reduction rate measurement: and injecting water into a certain area of the victory oil field to prepare a solution with the mass concentration of 0.3% from the pour point depressing and viscosity reducing oil displacement agent for displacing the oil in the high pour point oil reservoir. 30g of the prepared sample solution is weighed and put into a small beaker, 70g of oil sample of a certain block of a victory oil field is added, and the mixture is sealed and then placed into a constant temperature drying oven, and the temperature is kept at 70 ℃ for 2 hours. Taking out the oil-water mixture, rapidly stirring with a glass rod to uniformly mix the oil and water, and rapidly measuring the viscosity of the oil-water mixture at 70 ℃ by using a rheometer according to SY/T0520-2008.
The tack-free ratio was calculated as follows:
wherein:
-viscosity-reducing rate;
-viscosity of the high-viscosity oil sample at 70 ℃, mpa·s;
-viscosity of the oil-water mixture at 70 ℃, mpa.s.
3. And (3) measuring the wash oil rate:
3.1 mixing simulated stratum sand and crude oil of a target block according to the ratio (mass ratio) of 4:1, putting the mixture into a constant temperature drying oven, aging for 7d at the reservoir temperature, stirring for 1 time every day, and uniformly mixing the oil sand.
3.2, preparing 100g of 0.3% pour point depressing and viscosity reducing oil displacement agent sample solution for high pour point oil reservoir oil displacement by injecting water into a target block, and stirring for 15min on a magnetic stirrer at a rotating speed of 300r/min to be tested.
3.3 weighing about 5g of aged oil sand, placing into a 100mL conical flask, and weighing to obtainAccurate to 0.001g.
3.4 50g of the prepared sample solution is added to the 3.3 sample, and the mixture is fully mixed and then is kept stand for 48 hours at the reservoir temperature.
3.5 dipping the floating crude oil in the sample after 3.4 standing and the crude oil adhered on the bottle wall with clean cotton yarn, pouring out the sample solution, and drying the conical flask in a 105 ℃ oven to constant weight to obtain
3.6 crude oil elution was performed on the sample of 3.5 with petroleum ether until the petroleum ether was colorless. Placing the conical flask with the crude oil completely eluted in a baking oven at 120 ℃ to constant weight, and weighing to obtain
3.7 the wash oil ratio is calculated as follows:
wherein:
-wash oil rate;
-total mass of conical flask and oil sand before washing oil, g;
the mass g of the conical flask and the oil sand after oil washing;
-total mass of erlenmeyer flask and washed formation sand, g.
4. Pour point depressing magnitude determination
4.1 preparing an oil-water mixture according to a viscosity reduction rate measurement method.
4.2 determination of the congealing Point reference "GB/T510-2018 determination of congealing Point of Petroleum products".
Pour point depression magnitude = initial pour point of crude oil (55 ℃) -pour point of oil-water mixture.
The pour point depressing and viscosity reducing oil displacing agents for displacing high pour point oil reservoirs obtained in examples 1 to 5 and comparative examples 1 to 9 were subjected to the tests of interfacial tension, viscosity reducing rate, wash oil rate and pour point depressing amplitude according to the test methods described above, and the test results are shown in table 1. Wherein the following parameters are specified by Q/SH1020 2871-2021 at 70 ℃ as follows: interfacial tension is less than or equal to 5.0X10 - 2 mN/m, viscosity reduction rate is more than or equal to 90%, and wash oil rate is more than or equal to 40%. The pour point depressing amplitude is equal to or more than 15 ℃ according to the related standard requirements of pour point depressing.
TABLE 1 performance test of pour point depressing and viscosity reducing oil displacement agent for oil displacement of high pour point oil reservoir
As can be seen from Table 1 above, the formulation provided in the present application is formulated in a nanosurfactant CA601S, a nonionic surfactant cocoyl Monoisopropylamide (MIPA) and a Gemini (Gemini) surfactantsuperwet-360 wetting agentUnder the synergistic effect of the component proportions, the obtained pour point depressing and viscosity reducing oil displacement agent for high pour point oil reservoir oil displacement has more excellent performance than parameter standard, namely ultralow interfacial tension is less than or equal to 3.1 multiplied by 10 -3 The mN/m has the characteristics of viscosity reduction rate of more than or equal to 98.6%, wash oil rate of more than or equal to 50.8%, pour point reduction amplitude of more than or equal to 16 ℃ and the like, which means that the high-viscosity-reducing high-efficiency displacement oil reservoir has the functions of pour point reduction and high-efficiency displacement, and can greatly improve the recovery ratio of crude oil when being applied to chemical flooding of the high-viscosity oil reservoir. />
Claims (9)
1. The pour point depressing and viscosity reducing oil displacement agent for oil displacement of high pour point oil reservoir is characterized by comprising, by mass, 18% -22% of nano surfactant, 20% -24% of nonionic surfactant, 15% -20% of Gimmy Gemini surfactant, 15% of mutual solvent and the balance of water.
2. The pour point depressing and viscosity depressing oil displacement agent according to claim 1, characterized in that the nanometer surfactant is the nanometer surfactant with the code of CA601S, and the grain diameter is less than or equal to 200nm.
3. The pour point depressing and viscosity reducing oil displacing agent according to claim 1, wherein the nonionic surfactant is cocoyl monoisopropanolamide MIPA.
4. The pour point depressing and viscosity depressing oil displacement agent of claim 1, wherein the Gemini surfactant is selected from the group consisting ofThe chemical component of the super wet-360 wetting agent is 2,5,8, 11-tetramethyl-6-dodecyne-5, 8-diol polyoxyethylene ether.
5. The pour point depressing and viscosity reducing oil displacing agent according to claim 1, wherein the mutual solvent is ethyl acetate.
6. The pour point depressing viscosity reducing flooding of any one of claims 1-5The oil is characterized in that when the oil is compatible with water with the mineralization degree of 0-100000mg/L and the total concentration of calcium ions and magnesium ions of 0-2500mg/L, the interfacial tension is less than or equal to 3.1X10 -3 mN/m, viscosity-reducing rate is more than or equal to 98.6%, wash oil rate is more than or equal to 50.8%, and pour point depressing amplitude is more than or equal to 16 ℃.
7. A method for preparing a pour point depressing and viscosity reducing oil displacing agent for displacing oil in a high pour point oil reservoir according to any one of claims 1 to 6, comprising the steps of:
adding a nonionic surfactant into a reaction kettle, adding a mutual solvent, stirring uniformly at the temperature of 30-40 ℃, adding water, stirring for 30min, and finally adding a Gimmy Gemini surfactant and a nano surfactant, and stirring uniformly to obtain the pour point depressing and viscosity reducing oil displacement agent for oil displacement of the high pour point oil reservoir.
8. Use of a pour point depressing and viscosity depressing oil displacement agent for displacing oil in a high pour point oil reservoir according to any one of claims 1-6 in chemical displacement of high pour point oil reservoirs with a crude oil wax content of less than or equal to 40%, a freezing point of less than or equal to 55 ℃, a formation water mineralization of 0-100000mg/L, and a calcium-magnesium ion concentration of less than or equal to 2500mg/L.
9. The use according to claim 8, wherein the pour point depressing and viscosity reducing oil displacing agent for displacing high pour point oil reservoirs is used at a concentration of 0.3%.
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