CN116925724A - Surfactant composition, preparation method and application thereof - Google Patents

Surfactant composition, preparation method and application thereof Download PDF

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CN116925724A
CN116925724A CN202210328380.6A CN202210328380A CN116925724A CN 116925724 A CN116925724 A CN 116925724A CN 202210328380 A CN202210328380 A CN 202210328380A CN 116925724 A CN116925724 A CN 116925724A
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surfactant
oil
surfactant composition
anionic
composition according
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金军
李应成
张卫东
鲍新宁
沙鸥
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China Petroleum and Chemical Corp
Sinopec Shanghai Research Institute of Petrochemical Technology
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China Petroleum and Chemical Corp
Sinopec Shanghai Research Institute of Petrochemical Technology
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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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)

Abstract

The application relates to a surfactant composition, and discloses a surfactant composition, a preparation method and application thereof. The surfactant composition comprises a surfactant, an amino additive, and optionally a small molecule organic cationic compound. The surfactant composition can improve the oil-water interfacial activity, the solubilization effect and the solubility, namely can reduce the oil-water interfacial tension, solubilize crude oil and improve the wetting change in the use process of an oil field, and is particularly suitable for oil displacement of the oil field with low-permeability and high clay content.

Description

Surfactant composition, preparation method and application thereof
Technical Field
The application relates to a surfactant composition, in particular to a surfactant composition, a preparation method and application thereof.
Background
The international petroleum community uses "millidarcy" (mD) as a basic unit reflecting the permeability of oil and gas, the lower the "millidarcy" value, the lower the permeability of oil and gas. In China, the permeability is generally less than 50 multiplied by 10 -3 μm 2 Is referred to as a low permeability reservoir. With long-term injectionThe water development, the conditions of high injection pressure and low injection amount of some eastern hypotonic old oil fields with high clay content greatly influence the recovery ratio of crude oil. Possible causes include plugging by drilling fluid mud, paraffin, gum, asphaltene deposits in the entry zone, plugging of pore throats in formations with high clay content due to clay swelling. For these plugging, conventional fracturing and acidizing depressurization and injection enhancement measures have short or even no effectiveness, and thus new and effective methods are needed to increase crude oil production.
The surfactant products for enhanced oil recovery at home and abroad at present mainly comprise: anionic surfactants such as petroleum sulfonate, alkylbenzenesulfonate, olefin sulfonate, and the like. The surfactant with the combination of yin and yang has been widely concerned and successfully applied on site in recent years. The anionic-cationic compound surfactant is prepared by introducing a compound nonionic group and a compound hydrophilic head group into an anionic surfactant at the same time, designing and synthesizing the anionic nonionic surfactant, and compounding the anionic nonionic surfactant with a surfactant containing a cationic group on the basis. After the cationic surfactant is introduced, the anionic surfactant has strong electrostatic action and interaction between hydrophobic carbon chains in the aqueous solution, so that the association between two surfactant ions with different charges is promoted, the limit occupied area of surfactant molecules is smaller, and the interface arrangement is more compact, thereby greatly reducing the critical micelle concentration of the surfactant, and the surfactant has the excellent characteristics of ultrahigh interfacial activity and ultrahigh solubilization performance. However, due to the specificity of the low-permeability high-clay-content oil reservoir, the yin-yang compound surfactant has the problems of low oil-water interfacial activity, poor solubilization effect, poor solubility and the like in oil displacement application of the low-permeability high-clay-content oil reservoir.
Therefore, in order to improve the oil displacement effect on low-permeability high-clay-content reservoirs, further development of surfactant compositions for oil fields is required to improve the oil-water interfacial activity, solubilization effect and solubility, and is suitable for low-permeability high-clay-content special reservoirs.
Disclosure of Invention
In order to overcome the problems in the prior art, the application discloses a surfactant composition, and a preparation method and application thereof. The surfactant composition can improve the oil-water interfacial activity, the solubilization effect and the solubility, namely can reduce the oil-water interfacial tension, solubilize crude oil and improve the wetting change in the use process of an oil field, and is particularly suitable for oil displacement of the oil field with low-permeability and high clay content.
It is an object of the present application to provide a surfactant composition comprising a surfactant, an amino additive and optionally a small molecule organic cationic compound.
According to the application, preferably, the amino additive does not comprise a compound having an amide group and a C2 to C18 polyamine carboxylate.
According to the present application, the weight ratio of the surfactant to the amino additive may be selected within a wide range, and in a preferred embodiment of the present application, the weight ratio of the surfactant to the amino additive is 1 (0.01 to 100), preferably 1 (0.01 to 10), more preferably 1 (0.01 to 1).
According to the application, the weight ratio of the surfactant to the amino additive is preferably 1 (0.01 to 100), preferably 1 (0.01 to 10), more preferably 1 (0.01 to 1), for example, may be 1:0.01, 1:0.04, 1:0.08, 1:0.12, 1:0.15, 1:0.2, 1:0.4, 1:0.6, 1:0.8, 1:1, and a ratio of any number between 1 and 0.01 to 1 or any interval of any two numbers.
According to the present application, the surfactant composition may or may not contain a small molecular organic cationic compound, preferably a small molecular organic cationic compound. The content of the small molecular organic cationic compound may be selected within a wide range, and in a more preferred embodiment of the present application, the weight ratio of the surfactant, the amino additive and the small molecular organic cationic compound is 1 (0.01 to 100): 0.01 to 100, preferably 1 (0.01 to 10): 0.01 to 10, more preferably 1 (0.01 to 1): 0.01 to 1. The inventor of the present application found that in this preferred embodiment, the surfactant composition of the present application further improves the solubilization and seepage properties while maintaining the solubilization capacity generated by the surfactant (preferably, the surfactant of the combination of yin and yang), and finally improves the recovery ratio of the oil reservoir, by adding the amino additive and the small-molecule organic cationic compound on the basis of the surfactant (preferably, the surfactant of the combination of yin and yang).
According to the application, the obtained surfactant composition can reduce the oil-water interfacial tension, solubilize crude oil and improve the wetting change after being compounded with all surfactants, amino additives and optional micromolecular organic cationic compounds. The surfactant in the present application is widely selected, and preferably, the surfactant is at least one selected from anionic surfactant, cationic surfactant and nonionic surfactant. The surfactant can be a single kind of surfactant, or can be a plurality of surfactants and yin-yang compound surfactants. The surfactant includes, but is not limited to, a yin-yang complex surfactant. In a preferred embodiment of the present application, the surfactant is a yin-yang complex surfactant, and contains an anionic surfactant and a cationic surfactant; more preferably, the surfactant contains an anionic-nonionic surfactant and a cationic surfactant. The ratio of the anionic-nonionic surfactant to the cationic surfactant may be selected within a wide range, and in a more preferred embodiment of the present application, the molar ratio of the cationic surfactant to the anionic-nonionic surfactant is 1 (0.01 to 100), preferably 1 (0.1 to 10). The inventor of the application discovers through research that the surfactant composition of the application can not only reduce the tension of the oil-water interface and solubilize the residual oil in pores and further improve the migration capacity of fluid in stratum, but also solubilize organic matters deposited in near-wellbore regions such as paraffin, colloid and asphaltene and improve the permeability of oil reservoirs by further regulating the structure and proportion of the anionic surfactant.
According to the application, the molar ratio of cationic surfactant to anionic-nonionic surfactant is preferably 1 (0.01-100), preferably 1 (0.1-10), for example it may be 1:0.1, 1:0.4, 1:0.8, 1:1.2, 1:1.5, 1:2, 1:4, 1:6, 1:8, 1:10, and any number between 1 and 0.1-10 or any interval of any two numbers.
According to the present application, in the case where the surfactant in the surfactant composition is selected from the group consisting of anionic surfactant and cationic surfactant, the weight of the surfactant in the foregoing formulation means the total weight of the cationic surfactant and the anionic surfactant.
The cationic surfactant has a wide selection range for the above yin-yang compound surfactant, for example, the cationic surfactant contains more than 4C groups. In a preferred embodiment of the application, the cationic surfactant is selected from quaternary ammonium salts and/or quaternary ammonium bases; preferably, the cationic surfactant is selected from quaternary ammonium salts having a C4-C22 alkyl group and/or quaternary ammonium bases having a C4-C22 alkyl group. More preferably, the quaternary ammonium salt is selected from at least one of tetraalkylammonium chloride, tetraalkylammonium bromide, tetraalkylammonium bisulfate and alkylbenzyl ammonium chloride; the quaternary ammonium base is selected from tetraalkylammonium hydroxide and/or alkylbenzylammonium hydroxide; still more preferably, the cationic surfactant is selected from tetraalkylammonium chloride and/or tetraalkylammonium hydroxide. For example, at least one selected from cetyltrimethylammonium chloride, octadecyltrimethylammonium chloride, cetylbenzyldimethylammonium chloride, tetradecyltrimethylammonium chloride, dodecyltrimethylammonium chloride, tetrabutylammonium chloride, dioctadecyldimethylammonium chloride, sunflower-based triethylammonium chloride, tetraoctylammonium chloride, and benzyltriethylammonium chloride, more for example, at least one selected from dodecyltrimethylammonium chloride, tetrabutylammonium chloride, dioctadecyldimethylammonium chloride, sunflower-based triethylammonium chloride, tetraoctylammonium chloride, and benzyltriethylammonium chloride.
For the above yin-yang complex surfactant, the selection range of the anionic surfactant is wider, and in a preferred embodiment of the present application, the anionic surfactant is an anionic-nonionic surfactant; more preferably, the anionic-nonionic surfactant is selected from alkyl polyether carboxylates and/or polyether sulfonates; even more preferably selected from polyoxyethylene polyoxypropylene ether sulfonates and/or polyoxyethylene polyoxypropylene ether carboxylates. More preferably selected from the compounds of formula (I) and/or formula (II).
Wherein in the formulas (I) and (II), M is selected from any one of alkali metal, alkaline earth metal or ammonium ion, and R is selected from H, C 1 ～C 20 Any one of alkyl, phenyl and substituted phenyl, and n is any integer from 0 to 100.
In a further preferred embodiment, in formula (I) and formula (II), M is selected from Na, K, mg, ca or NH 4 + Any one of them; r is selected from H, C 5 ～C 15 Alkyl, C of (2) 5 ～C 15 Any one of alkyl-substituted phenyl groups; n is any integer from 0 to 100.
In a still further preferred embodiment, the anionic-nonionic surfactant is selected from at least one of octylphenol polyoxyethylene ether carboxylate, sunflower alkylphenol polyoxyethylene ether carboxylate, and isomeric tridecanol polyoxyethylene ether carboxylate.
According to the present application, the anionic-nonionic surfactant may be prepared commercially or by the prior art. For example, the preparation can be carried out by adopting the technical scheme disclosed in CN101279935A, CN 111088011A, CN 111088013A, CN 111088014A.
According to the application, the amino additive does not comprise a compound having an amide group and the selection range is wide. In a preferred embodiment of the present application, the amino additive is selected from at least one of a C8-C12 aliphatic amine, a C2-C12 aliphatic diamine, a C5-C8 alicyclic amine, an N-heterocyclic aromatic hydrocarbon, and an aminophenol; for example, it may be selected from commercially available products including, but not limited to, diethylamine, triethylamine, isopropylamine, 1, 3-propylenediamine, 1, 2-propylenediamine, tripropylamine, butylamine, isobutylamine, t-butylamine, benzylamine, cyclohexylamine, pyridine, o-aminophenol, m-aminophenol, p-aminophenol, and the like. More preferably, the amino additive is selected from at least one of 1, 3-propanediamine, 1, 2-propanediamine, xin An, benzylamine, cyclohexylamine, pyridine, o-aminophenol, m-aminophenol, and p-aminophenol.
According to the application, the small molecule organic cationic compound has a wide selection range, and in a preferred embodiment of the application, the small molecule organic cationic compound is a quaternary ammonium salt with a C1-C4 group and/or a quaternary ammonium base with a C1-C4 group; preferably, the C-containing groups connected with N in the quaternary ammonium salt and the quaternary ammonium base are all C1-C4 groups; more preferably, the C1-C4 group is a C1-C4 hydrocarbon group or a C1-C4 cyclic hydrocarbon group; even more preferably, the small molecule organic cationic compound has a C atom number of less than 16; even more preferably, the small molecule organic cationic compound is selected from at least one of epoxypropyl trimethyl ammonium chloride, trimethylallyl ammonium chloride, tetramethyl ammonium chloride, and ethyltrimethyl ammonium chloride.
It is a further object of the present application to provide a process for preparing the surfactant composition as described above, by mixing the components including the surfactant, the amino additive and optionally the small molecule organic cationic compound.
The application also provides an oil displacement liquid for oil fields, which comprises the surfactant composition and water.
According to the present application, the mass ratio of the surfactant composition to water may be selected within a wide range, and in a preferred embodiment of the present application, the mass ratio of the surfactant composition to water is not more than 10:100; preferably (0.05-5): 100.
according to the present application, preferably, the mass ratio of the surfactant composition to water is not more than 10:100; preferably (0.05-5): 100, for example, may be 0.05:100, 0.1:100, 0.2:100, 0.3:100, 0.5:100, 1:100, 2:100, 3:100, 4:100, 5:100, and any value between 0.05 and 5 or any interval of any two values to 100.
According to the application, the mineralization degree of water in the oil displacement liquid suitable for the application has a wide selection range, for example, the mineralization degree of the water can be 0-25%. Wherein the mineralization degree of water is 0-25%, which refers to mass concentration.
It is a fourth object of the present application to provide the use of a surfactant composition as hereinbefore described or a flooding fluid as hereinbefore described in oilfield exploitation.
Compared with the prior art, the application has the following beneficial effects:
(1) The surfactant composition can improve the surface activity, preferably can improve the solubilizing performance of the yin-yang compound surfactant and improve the seepage capacity of the low-permeability oil reservoir;
(2) The surfactant composition improves the dissolution capacity of a surfactant system and meets the injection requirement of a hypotonic rock core;
(3) The surfactant composition and the flooding fluid can obviously reduce the damage of colloid asphaltene and clay expansion to the core, and have lower core damage rate.
(4) The surfactant composition can improve the oil-water interfacial activity, the solubilization effect and the solubility, namely can reduce the oil-water interfacial tension, solubilize crude oil and improve the wetting change in the use process of an oil field, and is particularly suitable for oil displacement of the oil field with low-permeability and high clay content.
The surfactant composition and the flooding liquid of the present application have the above advantages, and the inventors of the present application have studied to consider that the cause may be: the surfactant composition of the application enhances the wetting regulation capability of a system under the coordination of a surfactant (preferably a yin-yang compound surfactant), an amino additive and an optional micromolecular organic cationic compound, thereby improving the seepage capability of fluid in pores of a hypotonic oil reservoir, further improving the interfacial activity of the surfactant, particularly the yin-yang compound surfactant system, and further enhancing the universality of the surfactant, particularly the yin-yang compound surfactant, in oilfield application.
Detailed Description
The present application is described in detail below with reference to specific embodiments, and it should be noted that the following embodiments are only for further description of the present application and should not be construed as limiting the scope of the present application, and some insubstantial modifications and adjustments of the present application by those skilled in the art from the present disclosure are still within the scope of the present application.
The procedure of example 1 of CN101279935a was followed, except that step (2) was not performed, and step (3) was performed directly after the end of step (1), to obtain the anionic-nonionic surfactant of the present application. Specifically, nonylphenol, dodecylphenol and isomeric tridecanol are respectively adopted as raw materials to correspondingly obtain sodium nonylphenol polyoxyethylene ether carboxylate, sodium dodecylphenol polyoxyethylene ether carboxylate and sodium isomeric tridecanol polyoxyethylene ether carboxylate in the embodiment.
Other materials are used in the examples, and are all as disclosed in the prior art, for example, available directly or prepared according to the preparation methods disclosed in the prior art, if not particularly limited.
In examples and comparative examples, oil-water interfacial tension was measured using a TX-500C rotary drop interfacial tensiometer in the united states. Phase experiments were mainly performed by glass capillary methods. A certain amount of surfactant solution and crude oil are sequentially mixed according to a water-oil ratio (WOR) 1:1, adding the mixture into a capillary tube with one sealed end, and recording the liquid levels of the surfactant solution and the crude oil and the added mass of each. The glass capillary tube was then dipped into a10 ml capacity oil bath glass tube filled with silicone oil after being sealed with an alkyne oxygen flame or epoxy glue, and placed in a metal bath (Hanuo Instruments) and heated at reservoir temperature 52 ℃. The test tube is first shaken manually or mechanically to mix the oil and water phases uniformly, and then equilibrated in a constant temperature metal bath for several days to several weeks until no further changes in the oil and water level occur. The Solubilization Parameters (SP) of the oil phase and the water phase can be calculated according to the change of the oil-water interface liquid level in the microemulsion:
wherein V is i Is the volume of the aqueous phase or the oil phase in the microemulsion, V s Is the surfactant volume. The calculation of the SP parameters has three assumptions: the total volume is unchanged after the oil and water are mixedThe method comprises the steps of carrying out a first treatment on the surface of the All surfactants are in the microemulsion phase; the volume of surfactant is equal to its mass.
Method for detecting contact angle on core: measured by a german g Lv Shi DSA100 contact angle measuring instrument.
The method for detecting the transparency of the solution comprises the following steps: the appearance of the 0.5% strength composition solution was visually observed.
In the examples, the amount of static adsorption of surfactant was measured in terms of mass ratio of surfactant solution to simulated sand (90% 80-100 mesh silica sand +10% kaolin) of 3:1, mixing, and placing into a constant-temperature water bath (oil reservoir temperature, and rotating speed of 170 r/min) to oscillate for 24h.
Core displacement experiment: core displacement tests were performed using a cylindrical artificial sandstone core 25mm in diameter and 80mm in length. The core porosity was 25% and the permeability was 50md (50 md unless otherwise specified, with special reference to the actual permeability corresponding to the examples). The core is formed by pressing quartz sand with certain particle size distribution and kaolin with 10% content through cementing agent (supplied by oil scientific research instruments Co., sea-A-county). The core is first saturated with formation water and then displaced by crude oil. After this, maximum oil saturation is achieved by exchanging the injection and outlet ends until no brine for displacement is observed in the produced fluid. The cores were then aged at the required temperature for 10 days. The fluid injection rate was 0.1mL/min. The injection sequence is as follows:
and (3) water driving: brine is injected into the stratum until no crude oil is found in the effluent.
Chemical driving: a surfactant composition of 0.5 Pore Volume (PV) was injected. The mass concentration of the composition was 0.3%.
And (3) post water flooding: reinjection water is carried out until crude oil is not found in the effluent.
Examples 1 to 4 and comparative example 1
The surfactant composition is prepared from sodium octylphenol polyoxyethylene ether carboxylate, dodecyl trimethyl ammonium chloride, 1, 2-propylene diamine and trimethyl allyl ammonium chloride according to the following proportion, and water is added to prepare oil displacement liquid for oil fields, wherein the concentration of the surfactant composition in the oil displacement liquid for oil fields is 0.5wt%. Wherein, the mass ratio of the anionic surfactant (sodium octylphenol polyoxyethylene ether carboxylate and dodecyl trimethyl ammonium chloride is 8:3), 1, 2-propylene diamine and trimethyl allyl ammonium chloride is 1: (0-0.5): (0-0.5), specifically shown in Table 1, the mineralization degree of the oil-displacing liquid for oil fields is 0.5%, and the performance of the oil-displacing liquid for oil fields at 20 ℃ is shown in Table 1.
TABLE 1
The result shows that the amino additive is added into the yin-yang compound surfactant, the interfacial tension is reduced, the solubilization parameter is increased, the micromolecular organic cationic compound is added, the interfacial tension is further reduced, the property of the solubilized crude oil is further improved (the solubilization parameter is increased), and the oil displacement requirement is met.
Examples 5 to 8 and comparative examples 2 to 3
The contact angle of water on the core was measured after immersing the core sections containing oil in the oil displacement liquids for oil fields of examples (examples 1 to 4 and comparative example 1) for 24 hours, respectively, after aging for 7 days, and the results are shown in table 2. Namely, the surfactant composition was prepared by mixing sodium octylphenol polyoxyethylene ether carboxylate, dodecyltrimethylammonium chloride, 1, 2-propylenediamine and trimethylallylammonium chloride in the following ratio, and adding water to prepare a flooding fluid for oil field, wherein the concentration of the surfactant composition in the flooding fluid for oil field was 0.5wt%. The anionic and cationic surfactant consists of sodium octyl phenol polyoxyethylene ether carboxylate and dodecyl trimethyl ammonium chloride in the molar ratio of 8 to 3.
TABLE 2
The results in table 2 show that the slices are oil-wet after aging, the slices become weak water-wet after adding the yin-yang compound surfactant, the slices are more hydrophilic after further adding the amino additive, and the slices are changed towards the oleophilic direction but are not changed much after adding the small molecular organic cation compound. The wettability of the core can be adjusted by the proportion of different components to achieve the optimal condition for meeting the displacement performance.
Examples 9 to 12 and comparative example 4
Preparing a surfactant composition from sodium dodecyl phenol polyoxyethylene ether sulfate, tetradecyl trimethyl ammonium chloride, triethylamine and tetramethyl ammonium chloride according to a certain proportion to obtain the surfactant composition, adding water to prepare oil displacement liquid for oil fields, wherein the surfactant composition in the oil displacement liquid for oil fields is 0.5wt%, and the anionic surfactant (the molar ratio of the sodium dodecyl phenol polyoxyethylene ether sulfate to the tetradecyl trimethyl ammonium chloride is 7.3:2.7), the benzylamine and the tetramethyl ammonium chloride is 1: (0-0.5): (0-0.5), specifically shown in Table 3, the mineralization degree of the oil displacement liquid for the oil field is 0.8%, and the performance of the oil displacement liquid for the oil field at 80 ℃ is shown in Table 3.
TABLE 3 Table 3
The results in Table 3 show that the amino additive is added into the yin-yang compound surfactant at 80 ℃, the interfacial tension is reduced, the solubilization parameter is increased, the micromolecular organic cationic compound is added, the interfacial tension is further reduced, the property of the solubilized crude oil is further improved (the solubilization parameter is increased), and the oil displacement requirement is met. Meanwhile, the static adsorption capacity of the amino additive is reduced, and the static adsorption capacity is reduced further after the micromolecular organic cationic compound is added, so that the retention of the active ingredients of the surfactant composition is further improved, and the activity of the surfactant composition is further improved.
Examples 13 to 16 and comparative example 5
Anionic and cationic surfactants (molar ratio of sodium sunflower alkylphenol ethoxylate sulfonate and cetyltrimethylammonium chloride is 7:1.5), isobutylamine and epoxypropyl trimethyl ammonium chloride are prepared into surfactant compositions according to a certain proportion, water is added into the surfactant compositions to prepare oil displacement liquid for oil fields, the concentration of the surfactant compositions in the oil displacement liquid for oil fields is 0.5 weight percent, the mineralization degree of the solution is 0.5 percent, and the solution performance at 90 ℃ is shown in table 4.
TABLE 4 Table 4
The results in Table 4 show that the interfacial tension of the surfactant and crude oil at 90 ℃ reaches ultralow at the temperature of yin and yang, but the solution is turbid, the injection performance is affected, the interfacial tension is reduced after the amino additive is added, the solubilization parameter is increased, the interfacial tension is further reduced after the micromolecular organic cationic compound is added, the performance of solubilizing the crude oil is further improved (the solubilization parameter is increased), the solution becomes clear gradually from turbidity, and the injection requirement of the hypotonic rock core is met.
Examples 17 to 19 and comparative example 6
The surfactant compositions of the above examples (examples 13-16 and comparative example 5) were subjected to core displacement experiments at 90℃and the results are shown in Table 5.
The surfactant composition 1, the surfactant composition 2 and the surfactant composition 3 are respectively and correspondingly formed by combining an anionic surfactant, isobutyl amine and epoxypropyl trimethyl ammonium chloride according to the ratio of 1:0:0,1:0.1:0 and 1:0.1:0.1. The anionic and cationic surfactant consists of sodium sunflower alkylphenol ethoxylate sulfonate and cetyltrimethylammonium chloride according to a molar ratio of 7:1.5. The concentration of the surfactant composition in the oil displacement liquid for oil fields is 0.5wt% and the mineralization degree of the solution is 0.5%.
TABLE 5
From the results, the oil displacement effect becomes better gradually with the addition of the isobutyl amine. After the epoxypropyl trimethyl ammonium chloride is further added, the oil displacement effect becomes better.
It should be noted that the above-described embodiments are only for explaining the present application and do not constitute any limitation of the present application. The application has been described with reference to exemplary embodiments, but it is understood that the words which have been used are words of description and illustration, rather than words of limitation. Modifications may be made to the application as defined in the appended claims, and the application may be modified without departing from the scope and spirit of the application. Although the application is described herein with reference to particular means, materials and embodiments, the application is not intended to be limited to the particulars disclosed herein, as the application extends to all other means and applications which perform the same function.
All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference in their entirety. Unless defined otherwise, all technical and scientific terms used herein have the meaning commonly understood by one of ordinary skill in the art. In case of conflict, the present specification, definitions, will control.
When the specification derives materials, substances, methods, steps, devices, or elements and the like in the word "known to those skilled in the art", "prior art", or the like, such derived objects encompass those conventionally used in the art as the application suggests, but also include those which are not currently commonly used but which would become known in the art to be suitable for similar purposes.
The endpoints of the ranges and any values disclosed in this document are not limited to the precise range or value, and the range or value should be understood to include values approaching the range or value. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein. In the following, the individual technical solutions can in principle be combined with one another to give new technical solutions, which should also be regarded as specifically disclosed herein.
In the context of this specification, any matters or matters not mentioned are directly applicable to those known in the art without modification except as explicitly stated.
Moreover, any embodiment described herein can be freely combined with one or more other embodiments described herein, and the technical solutions or ideas thus formed are all deemed to be part of the original disclosure or original description of the present application, and should not be deemed to be a new matter which has not been disclosed or contemplated herein, unless such combination is clearly unreasonable by those skilled in the art.

Claims (12)

1. A surfactant composition comprising a surfactant, an amino additive, and optionally a small molecule organic cationic compound.
2. The surfactant composition according to claim 1, characterized in that:
the weight ratio of the surfactant to the amino additive is 1 (0.01-100), preferably 1 (0.01-10).
3. The surfactant composition according to claim 1, characterized in that:
the weight ratio of the surfactant to the amino additive to the small molecular organic cationic compound is 1 (0.01-100): 0.01-100, preferably 1 (0.01-10): 0.01-10, more preferably 1 (0.01-1): 0.01-1.
4. The surfactant composition according to claim 1, characterized in that:
the surfactant is at least one selected from anionic surfactant, cationic surfactant and nonionic surfactant; preferably, the method comprises the steps of,
the surfactant is a yin-yang compound surfactant and contains an anionic surfactant and a cationic surfactant; more preferably, the process is carried out,
the surfactant contains an anionic-nonionic surfactant and a cationic surfactant; still more preferably, the first and second regions,
the molar ratio of the cationic surfactant to the anionic-nonionic surfactant is 1 (0.01-100), preferably 1 (0.1-10).
5. The surfactant composition according to claim 4, wherein:
the cationic surfactant is selected from quaternary ammonium salts and/or quaternary ammonium bases; preferably, the quaternary ammonium salt is selected from at least one of tetraalkylammonium chloride, tetraalkylammonium bromide, tetraalkylammonium bisulfate and alkylbenzyl ammonium chloride; the quaternary ammonium base is selected from tetraalkylammonium hydroxide and/or alkylbenzylammonium hydroxide;
more preferably, the cationic surfactant is selected from tetraalkylammonium chloride and/or tetraalkylammonium hydroxide.
6. The surfactant composition according to claim 4 or 5, characterized in that:
the anionic surfactant is an anionic-nonionic surfactant; preferably, the method comprises the steps of,
the anionic-nonionic surfactant is selected from alkyl polyether carboxylate and/or polyether sulfonate; preferably selected from polyoxyethylene polyoxypropylene ether sulfonates and/or polyoxyethylene polyoxypropylene ether carboxylates.
7. The surfactant composition according to claim 1, characterized in that:
the amino additive is at least one selected from aliphatic amine of C8-C12, aliphatic diamine of C2-C12, alicyclic amine of C5-C8, N-heterocyclic aromatic hydrocarbon and aminophenol; preferably, the method comprises the steps of,
the amino additive is at least one selected from the group consisting of 1, 3-propanediamine, 1, 2-propanediamine, xin An, benzylamine, cyclohexylamine, pyridine, o-aminophenol, m-aminophenol and p-aminophenol.
8. The surfactant composition according to claim 1, characterized in that:
the small molecular organic cationic compound is quaternary ammonium salt with C1-C4 groups and/or quaternary ammonium base with C1-C4 groups; preferably, the C-containing groups connected with N in the quaternary ammonium salt and the quaternary ammonium base are all C1-C4 groups; more preferably, the C1-C4 group is a C1-C4 hydrocarbon group or a C1-C4 cyclic hydrocarbon group; more preferably, the process is carried out,
the small molecular organic cation compound is at least one selected from epoxypropyl trimethyl ammonium chloride, trimethyl allyl ammonium chloride, tetramethyl ammonium chloride and ethyl trimethyl ammonium chloride.
9. A process for the preparation of a surfactant composition according to any one of claims 1 to 8, comprising mixing the components including the surfactant, the amino additive and optionally the small molecule organic cationic compound.
10. A flooding fluid for an oilfield comprising the surfactant composition of any one of claims 1-8 and water.
11. The oil displacement fluid for oil fields according to claim 10, wherein:
the mass ratio of the surfactant composition to water is not more than 10:100; preferably (0.05-5): 100; and/or the mineralization degree of the water is 0-25%.
12. Use of the surfactant composition according to any one of claims 1 to 8 or the oilfield flooding fluid according to claim 10 or 11 in oilfield exploitation.
CN202210328380.6A 2022-03-31 2022-03-31 Surfactant composition, preparation method and application thereof Pending CN116925724A (en)

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