CN117821049A - Ternary composite oil displacement agent and preparation method thereof - Google Patents
Ternary composite oil displacement agent and preparation method thereof Download PDFInfo
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 42
- 239000011206 ternary composite Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 49
- 239000004094 surface-active agent Substances 0.000 claims abstract description 33
- 229920000642 polymer Polymers 0.000 claims abstract description 24
- 150000001875 compounds Chemical class 0.000 claims abstract description 19
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- 239000008398 formation water Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 230000007062 hydrolysis Effects 0.000 claims description 5
- 238000006460 hydrolysis reaction Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 65
- 239000010779 crude oil Substances 0.000 abstract description 23
- 238000011084 recovery Methods 0.000 abstract description 19
- 239000011148 porous material Substances 0.000 abstract description 5
- 238000004945 emulsification Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 27
- -1 Alkylbenzene sulfonate Chemical class 0.000 description 16
- 239000002585 base Substances 0.000 description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000003513 alkali Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 150000004996 alkyl benzenes Chemical class 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 125000005037 alkyl phenyl group Chemical group 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- IBODDUNKEPPBKW-UHFFFAOYSA-N 1,5-dibromopentane Chemical compound BrCCCCCBr IBODDUNKEPPBKW-UHFFFAOYSA-N 0.000 description 1
- HNNQYHFROJDYHQ-UHFFFAOYSA-N 3-(4-ethylcyclohexyl)propanoic acid 3-(3-ethylcyclopentyl)propanoic acid Chemical compound CCC1CCC(CCC(O)=O)C1.CCC1CCC(CCC(O)=O)CC1 HNNQYHFROJDYHQ-UHFFFAOYSA-N 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- RDHPKYGYEGBMSE-UHFFFAOYSA-N bromoethane Chemical compound CCBr RDHPKYGYEGBMSE-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- YRIUSKIDOIARQF-UHFFFAOYSA-N dodecyl benzenesulfonate Chemical compound CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 YRIUSKIDOIARQF-UHFFFAOYSA-N 0.000 description 1
- KWKXNDCHNDYVRT-UHFFFAOYSA-N dodecylbenzene Chemical compound CCCCCCCCCCCCC1=CC=CC=C1 KWKXNDCHNDYVRT-UHFFFAOYSA-N 0.000 description 1
- 229940071161 dodecylbenzenesulfonate Drugs 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- TZLNJNUWVOGZJU-UHFFFAOYSA-M sodium;3-chloro-2-hydroxypropane-1-sulfonate Chemical compound [Na+].ClCC(O)CS([O-])(=O)=O TZLNJNUWVOGZJU-UHFFFAOYSA-M 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000011877 solvent mixture Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 238000006277 sulfonation reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
Landscapes
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
Disclosed is a ternary complex oil displacement agent, comprising weak base, polymer and surfactant; wherein the surfactant comprises sodium dodecyl benzene sulfonate and a compound of formula (1). The weak base is used, so that the affinity to stratum is good; meanwhile, the compatibility between the mixed surfactant and the polymer is good, so that the interfacial tension between the oil displacement agent and crude oil is reduced, the emulsification of the crude oil is promoted, the wettability of the oil layer pores is changed, and the recovery ratio of the ternary composite flooding crude oil is improved.
Description
Technical Field
The invention belongs to the technical field of tertiary oil recovery in oilfield development; relates to a ternary composite oil displacement agent and a preparation method thereof.
Background
Petroleum is taken as a nonrenewable strategic material and plays a role in economic development and national defense construction. How to effectively improve the recovery efficiency of crude oil in an oil field is a subject of attention and research worldwide. The development process of oil extraction technology in oil fields mainly goes through three stages:
the first stage, the oil mass generated along with the natural burst of the pressure of the petroleum in the original stratum is generally 5-25%;
in the second stage, energy loss is supplemented by water or gas injection, so that certain pressure can be kept all the time to ensure continuous petroleum exploitation, namely secondary oil exploitation, and the oil extraction rate can be improved to about 30%;
and in the third stage, after the crude oil in the stratum is recovered for the first time and the second time, about 60-70% of crude oil still remains, tertiary oil recovery is needed, the property of liquid in a flowing layer, the phase state, the interfacial effect among three phases of gas, liquid and solid are changed again by utilizing new technologies such as physics, chemistry, biology and the like, the sweep efficiency and the oil washing efficiency of the fluid in the pit are improved, and thus the recovery quantity of the crude oil is improved.
The oil extraction technology of the second stage through water injection or gas injection and the chemical oil displacement technology of the third stage can be called enhanced oil extraction technology. The second stage of enhanced oil recovery can be divided into water flooding and gas flooding, wherein the water flooding mainly comprises profile control, water shutoff and the like, while the gas flooding is relatively complex and comprises mixed phase flooding and non-mixed phase flooding. The oil extraction technology in the third stage is mainly chemical oil displacement, mainly polymer flooding, alkali flooding, surfactant flooding and the compound flooding oil extraction technology in which the polymer flooding, the alkali flooding and the surfactant flooding are mixed with each other, and comprises a binary compound flooding system and a ternary compound flooding system.
The chemicals typically added to ternary complex systems are bases, surfactants and polymers. The effect of alkali on crude oil is complex, and it is widely believed that asphaltene, colloid, naphthenic acid, carboxylic acid and other acidic components in crude oil and alkali react chemically on the oil-water interface, and the generated substances with surface activity and substances with natural surface activity in situ are mixed and adsorbed on the oil-water interface, so that the oil-water interfacial tension is reduced together, and the ternary composite flooding produced water emulsion is more stable. The surfactant is added to reduce the interfacial tension of oil and water, reduce the flow resistance of heterogeneous oil and water system in oil reservoir and strip the crude oil adhered to the rock surface. When water is injected, the polymer is added to obviously increase the viscosity of water, the residence time of the oil displacement agent in the pores is obviously increased, and the fluidity ratio of water to oil is obviously reduced, so that the sweep coefficient of underground fluid is improved.
Alkylbenzene sulfonate is one of the surfactants widely used in tertiary oil recovery technology, and the currently marketed products are basically all dodecylbenzene sulfonate, heavy alkylbenzene is a by-product of dodecylbenzene, and the yield of the heavy alkylbenzene sulfonate is also increasing year by year, but the final sulfonated products are very different due to the complex composition of the heavy alkylbenzene raw material. The alkylbenzene sulfonate surfactant can obviously reduce the interfacial tension of a crude oil system at low concentration, is related to the molecular structure, and has lipophilic groups and hydrophilic groups at two ends of the molecular structure to form an asymmetric structure, so that the surfactant is required to have proper proportion of hydrophilic groups and lipophilic groups so as to ensure that larger lateral attractive force can be formed between adsorption molecules on an interface, and a solid adsorption film can be formed on an oil-water interface to generate lower interfacial tension.
The Chinese patent application CN1426833A discloses an alkylbenzene sulfonate surfactant suitable for weak base, wherein the average equivalent weight of alkylbenzene sulfonate is 400-470, the alkylphenyl is a heavy alkylphenyl between C10-C24, and 5% -25% of alcohol is compounded in the alkylbenzene sulfonate to obtain the final product alkylbenzene sulfonate surfactant, and the alkylbenzene sulfonate surfactant is synthesized by sulfonation reaction with heavy alkylbenzene as a raw material, so that the raw material is easy to obtain, the preparation cost is low, and the product performance is stable. The ternary composite system prepared from the alkylbenzene sulfonate can form ultralow interfacial tension with Daqing crude oil, and core oil displacement experiments on the ternary composite system show that the ternary composite system can improve the recovery ratio by more than 20% compared with water displacement, and the ternary composite system has a good effect as an oil displacement agent.
Chinese patent application CN112442349a discloses an oil-displacing agent composition comprising alkylphenol ethoxylate sulfonate, mixed alkylbenzene sulfonate and water, wherein the mixed alkylbenzene sulfonate comprises at least two alkylbenzene sulfonates of different alkyl carbon numbers, and the average alkyl carbon number CN of the mixed alkylbenzene sulfonate is in the range of 28 to 36. When the oil displacement agent composition is used for water flooding of a heavy oil reservoir, the oil displacement agent composition has the dual effects of reducing viscosity, displacing oil and expanding sweep volume, can effectively improve the flowability of the heavy oil and plug high permeable layers of stratum, further greatly improves the recovery ratio of the heavy oil, and has good industrial application prospect.
However, the ternary combination in the prior art drives strong alkali, which causes great damage to stratum; meanwhile, the compatibility between the alkylbenzene sulfonate serving as a single surfactant and the polymer is not ideal, so that emulsion formed by crude oil, alkali, polymer and surfactant is poor in stability, and further the recovery ratio of the crude oil of the ternary complex flooding is affected to a great extent.
In order to improve the recovery ratio of crude oil in an oil field and realize new deep recovery, a novel ternary composite oil displacement agent suitable for the properties and the current recovery situation of crude oil is urgently needed, and a preparation method thereof.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a novel ternary composite oil displacement agent and a preparation method thereof.
In order to achieve the above object, on the one hand, the technical scheme adopted by the invention is as follows: a ternary composite oil displacement agent comprises weak base, polymer and surfactant; wherein the surfactant comprises sodium dodecyl benzene sulfonate and a compound of formula (1),
the ternary composite oil displacement agent of the invention, wherein the weight ratio of sodium dodecyl benzene sulfonate to the compound of formula (1) is (8-6): (2-4).
The ternary complex oil displacement agent disclosed by the invention, wherein the surfactant consists of sodium dodecyl benzene sulfonate and a compound shown in a formula (1).
The ternary complex oil displacement agent disclosed by the invention, wherein the weak base is selected from sodium carbonate.
The ternary complex oil displacement agent according to the invention, wherein the polymer is selected from partially hydrolyzed polyacrylamides having a viscosity average molecular weight of 1500-2400 kilodaltons.
The ternary composite oil displacement agent disclosed by the invention has the advantage that the hydrolysis degree of polyacrylamide is 22-28%.
The ternary composite oil displacement agent disclosed by the invention comprises the following components in percentage by weight: (2-5): (40-48).
In a specific embodiment, the ternary complex oil displacement agent is comprised of a weak base, a polymer, and a surfactant.
In another aspect, the invention provides a method of preparing a ternary complex oil displacing agent according to the present invention, comprising the step of mixing a weak base, a polymer and a surfactant.
In yet another aspect, the invention provides a ternary complex oil-displacing agent solution comprising a ternary complex oil-displacing agent according to the present invention and simulated formation water.
The ternary composite oil displacement agent solution disclosed by the invention is characterized in that the weight percentage of the ternary composite oil displacement agent is 0.5-4%.
Compared with the prior art, the ternary composite oil displacement agent disclosed by the invention uses weak base and has good affinity to stratum; meanwhile, the compatibility between the mixed surfactant consisting of sodium dodecyl benzene sulfonate and the compound shown in the formula (1) and the polymer is good, so that the interfacial tension between the oil displacement agent and crude oil is reduced, the emulsification of the crude oil is promoted, the wettability of the pores of an oil layer is changed, and the recovery ratio of the ternary complex flooding crude oil is improved.
Detailed Description
It must be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include both a reference and a plurality of references (i.e., more than two, including two) unless the context clearly dictates otherwise.
Unless otherwise indicated, the numerical ranges in the present invention are approximate, and thus values outside the ranges may be included. The numerical ranges may be expressed herein as from "about" one particular value, and/or to "about" another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about," it will be understood that the particular value forms another aspect. It will also be understood that the endpoints of each of the numerical ranges are significant both in relation to the other endpoint, and independently of the other endpoint.
References in the specification and the claims to parts by weight of a particular element or component in a composition or article refer to the relationship by weight between that element or component and any other element or component in the composition or article.
In the present invention, unless specifically indicated to the contrary, or implied by the context of the context or conventional means in the art, the solutions referred to in the present invention are aqueous solutions; when the solute of the aqueous solution is a liquid, all fractions and percentages are by volume, and the volume percent of the component is based on the total volume of the composition or product comprising the component; when the solute of the aqueous solution is a solid, all fractions and percentages are by weight, and the weight percentages of the components are based on the total weight of the composition or product comprising the components.
References to "comprising," "including," "having," and similar terms in this invention are not intended to exclude the presence of any optional components, steps or procedures, whether or not any optional components, steps or procedures are specifically disclosed. For the avoidance of any doubt, unless stated to the contrary, all methods claimed through use of the term "comprising" may include one or more additional steps, apparatus parts or components and/or materials. In contrast, the term "consisting of … …" excludes any component, step or procedure not specifically recited or enumerated. The term "or" refers to members recited individually as well as in any combination unless otherwise specified.
Furthermore, the contents of any of the referenced patent documents or non-patent documents in the present invention are incorporated by reference in their entirety, especially with respect to the definitions and general knowledge disclosed in the art (in case of not inconsistent with any definitions specifically provided by the present invention).
In the present invention, parts are parts by weight unless otherwise indicated, temperatures are expressed in degrees celsius or at ambient temperature, and pressures are at or near atmospheric. Room temperature represents 20-30 ℃. There are numerous variations and combinations of reaction conditions (e.g., component concentrations, solvents needed, solvent mixtures, temperatures, pressures, and other reaction ranges) and conditions that can be used to optimize the purity and yield of the product obtained by the process. Only reasonable routine experimentation will be required to optimize such process conditions.
In the invention, average formation water of Daqing oil field is used as simulated formation water. The simulated formation water composition is: naCl 2294mg/L; KCl 13mg/L; caCl (CaCl) 2 42mg/L；MgCl 2 ·6H 2 O 172mg/L；Na 2 SO 3 75mg/L；NaHCO 3 1860mg/L; mineral degree: 4456mg/L.
Preparation example
In a four-necked round-bottomed flask equipped with a stirrer and a thermometer, 160mL of a 75% by volume ethanol solution was added, followed by addition of the compound of formula (2) (60 mmol), sodium 3-chloro-2-hydroxypropanesulfonate (60 mmol) and a small amount of sodium carbonate (2.2 g),
heating to reflux, and reacting for 12h under the condition of heat preservation. TLC detects the end point of the reaction. Cooling to room temperature, precipitating solid, and suction filtering. Washing 3 times with anhydrous toluene, recrystallizing with 75% ethanol solution, and drying to obtain white powder, i.e. compound of formula (3) with a yield of about 52%.
In a four-necked round bottom flask, 50mL of a 75% by volume ethanol solution, a compound of formula (3) (30 mmol) and a small amount of sodium carbonate (1 g) were added, and stirred well until completely dissolved; 1, 5-dibromo-n-pentane (22 mmol) was further added. And (3) reacting for 4 hours under the reflux condition, and directly carrying out the next reaction after the reaction is finished.
In a four-necked round bottom flask, excess bromoethane (45 mmol) was added. The reaction was carried out under reflux for 48h. The filtrate was cooled to-5 ℃ using an ice salt bath, solids precipitated, and suction filtered. Washing with petroleum ether for 3 times, recrystallizing with ethanol/acetone mixed solvent (volume ratio of 1:6), and drying to obtain white powder, i.e. compound of formula (1).
The IR spectrum FT-IR of the compound of formula (1) is shown in Table 1.
TABLE 1
Example 1
According to the weight ratio of 7:3, mixing sodium dodecyl benzene sulfonate with the compound shown in the formula (1) to obtain a mixed surfactant component; the polymer component adopts partially hydrolyzed polyacrylamide with the viscosity average molecular weight of 1900 ten thousand daltons, and the degree of hydrolysis is 25%; the weak base component adopts sodium carbonate. Mixing the mixed surfactant component, the polymer component and the weak base component to obtain a ternary composite oil displacement agent; the weight ratio of the three is 10:3:45.
preparing a solution of a ternary composite oil displacement agent by using simulated formation water; wherein the weight percentage of the ternary composite oil displacement agent is 2%.
Example 2
According to the weight ratio of 6:4, mixing sodium dodecyl benzene sulfonate with the compound shown in the formula (1) to obtain a mixed surfactant component; the polymer component adopts partially hydrolyzed polyacrylamide with the viscosity average molecular weight of 1900 ten thousand daltons, and the degree of hydrolysis is 25%; the weak base component adopts sodium carbonate. Mixing the mixed surfactant component, the polymer component and the weak base component to obtain a ternary composite oil displacement agent; the weight ratio of the three is 10:4:42.
preparing a solution of a ternary composite oil displacement agent by using simulated formation water; wherein the weight percentage of the ternary composite oil displacement agent is 2%.
Comparative example 1
The surfactant is completely sodium dodecyl benzene sulfonate; the polymer component adopts partially hydrolyzed polyacrylamide with the viscosity average molecular weight of 1900 ten thousand daltons, and the degree of hydrolysis is 25%; the weak base component adopts sodium carbonate. Mixing the mixed surfactant component, the polymer component and the weak base component to obtain a ternary composite oil displacement agent; the weight ratio of the three is 10:3:45.
preparing a solution of a ternary composite oil displacement agent by using simulated formation water; wherein the weight percentage of the ternary composite oil displacement agent is 2%.
Oil displacement performance test
The core used for the oil displacement performance test is a heterogeneous artificial core with the size of 4.5cm multiplied by 30 cm; the thickness ratio of the three layers is 1:1:1, the average gas permeability is 1000md; the test water is the simulated formation water, and the test oil is dehydrated crude oil. The test was performed at a formation temperature of 50 ℃. Performing core displacement by using test oil, driving water to the water content of more than 98% at the outlet of the model, and calculating water drive recovery ratio; performing ternary composite flooding of 0.5PV slug, wherein the injection amount reaches the specified pore volume multiple; after the whole slug is injected, stopping the experiment when the water in the subsequent water flooding reaches more than 98% of the water in the outlet, and calculating the recovery ratio of the ternary complex flooding. The results are shown in Table 2.
TABLE 2
| Displacement mode | Water recovery ratio (%) | Chemical flooding recovery ratio (%) | Percentage increase |
| Pure water drive | 41.2 | —— | —— |
| Example 1 ternary complex flooding | 41.3 | 69.2 | 27.9 |
| Comparative example 1 ternary composite flooding | 41.3 | 63.4 | 22.1 |
As can be seen from table 2, the ternary complex oil-displacing agent of example 1 uses weak base and has better affinity to the stratum than that of comparative example 1; meanwhile, the compatibility between the mixed surfactant consisting of sodium dodecyl benzene sulfonate and the compound shown in the formula (1) and the polymer is good, so that the interfacial tension between the oil displacement agent and crude oil is reduced, the emulsification of the crude oil is promoted, the wettability of the pores of an oil layer is changed, and the recovery ratio of the ternary complex flooding crude oil is improved.
Further, it should be understood that various changes, substitutions, omissions, modifications, or adaptations to the present invention may be made by those skilled in the art after having read the present disclosure, and such equivalent embodiments are within the scope of the present invention as defined in the appended claims.
Claims (10)
1. A ternary composite oil displacement agent comprises weak base, polymer and surfactant; wherein the surfactant comprises sodium dodecyl benzene sulfonate and a compound of formula (1),
2. the ternary complex oil-displacing agent according to claim 1, wherein the weight ratio of sodium dodecyl benzene sulfonate to the compound of formula (1) is (8-6): (2-4).
3. The ternary complex oil-displacing agent of claim 1, wherein the surfactant consists of sodium dodecylbenzenesulfonate and a compound of formula (1).
4. The ternary complex oil-displacing agent of claim 1, wherein the weak base is selected from sodium carbonate.
5. The ternary complex oil-displacing agent of claim 1, wherein the polymer is selected from partially hydrolyzed polyacrylamides having viscosity average molecular weights of 1500-2400 kilodaltons.
6. The ternary complex oil-displacing agent of claim 5, wherein the degree of hydrolysis of polyacrylamide is 22-28%.
7. The ternary complex oil-displacing agent of claim 1, wherein the weight ratio of weak base, polymer to surfactant is 10: (2-5): (40-48).
8. A method of making the ternary complex oil displacing agent of any one of claims 1-7, comprising the step of mixing a weak base, a polymer, and a surfactant.
9. A ternary complex oil-displacing agent solution comprising the ternary complex oil-displacing agent of any one of claims 1-7 and simulated formation water.
10. The ternary complex oil-displacing agent solution of claim 9, wherein the weight percentage of ternary complex oil-displacing agent is 0.5-4%.
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| CN202311497094.3A CN117821049A (en) | 2023-11-10 | 2023-11-10 | Ternary composite oil displacement agent and preparation method thereof |
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