CN111961457B - Oil displacement complexing agent for heavy oil reservoir and preparation method and application thereof - Google Patents

Oil displacement complexing agent for heavy oil reservoir and preparation method and application thereof Download PDF

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CN111961457B
CN111961457B CN202010797615.7A CN202010797615A CN111961457B CN 111961457 B CN111961457 B CN 111961457B CN 202010797615 A CN202010797615 A CN 202010797615A CN 111961457 B CN111961457 B CN 111961457B
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sulfonate
alkyl
oil
olefin
flooding
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CN111961457A (en
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崔仕章
宋新旺
徐丽君
郭鑫
刘小芳
郑志微
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Deshi Energy Technology Group Co Ltd
Shandong Deshi Chemical Co Ltd
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Shandong Deshi Chemical Co Ltd
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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
    • C09K8/588—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 polymers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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

Abstract

The application discloses aAn oil displacement complexing agent for heavy oil reservoirs and a preparation method and application thereof belong to the technical field of oil field chemicals. The oil displacement complexing agent for the heavy oil reservoir comprises the following components in parts by weight: 1-12 parts of alkylbenzene sulfonate, 1-20 parts of alkyl sulfonate, 1-32 parts of olefin sulfonate, 1-40 parts of alkanolamide polyoxyethylene ether compound and 2-40 parts of low molecular alcohol; wherein the low molecular alcohol is selected from C3‑C10The alkanolamide polyoxyethylene ether compound is at least one compound selected from compounds with a structural formula shown in a formula I: in the formula I, m and n are selected from 0-15, but cannot be 0 at the same time, and when m and n are not 0, m is equal to n; r1 is selected from C8～C22One of the alkyl groups of (a); r2Selected from hydrogen or ester groups. The oil displacement complexing agent can be used in a tertiary oil recovery yield-increasing system of a heavy oil reservoir, and can obviously reduce the viscosity of crude oil, reduce the water-oil fluidity ratio and enrich the crude oil, thereby reducing the exploitation difficulty and greatly improving the recovery ratio of the crude oil.

Description

Oil displacement complexing agent for heavy oil reservoir and preparation method and application thereof
Technical Field
The application relates to an oil displacement complexing agent for a heavy oil reservoir and a preparation method and application thereof, belonging to the technical field of oil field chemicals.
Background
The thick oil accounts for a large proportion of the oil and gas resources in the world. According to statistics, the reserves of the heavy oil, the ultra-heavy oil and the natural asphalt in the world exceed 1000 hundred million tons, and countries with rich heavy oil resources include Canada, Venezuela, the United states, the Soviet Union, China, Indonesia and the like. China heavy oil asphalt resources are widely distributed, more than 70 heavy oil fields are found in 12 basins, and the quantity of the China heavy oil asphalt resources can reach more than 200 hundred million tons. In China, energy is scarce, and the heavy oil resource is one of important energy resources which cannot be ignored.
Most of the heavy oil reservoirs in China belong to low-grade petroleum resources, the physical properties of crude oil are poor, and the development, oil production, ground gathering and transportation and treatment difficulties are large. The heavy oil recovery mostly adopts a steam huff and puff and steam flooding mode, but a large amount of greenhouse gases are generated in the steam preparation process, the application of coal-fired and oil-fired boilers is limited along with the tightening of national environmental protection policies, the direction of recent development is changed from thermal recovery development to cold recovery development, and the key of the heavy oil cold recovery development is an oil displacement complexing agent.
Disclosure of Invention
The oil displacement complexing agent can be used in tertiary oil recovery of the heavy oil reservoir, can obviously reduce the viscosity of crude oil, enables the crude oil to easily flow and enrich, and reduces the water-oil fluidity ratio, thereby reducing the exploitation difficulty and greatly improving the crude oil recovery ratio.
According to one aspect of the application, an oil displacement complexing agent for a heavy oil reservoir is provided, which comprises the following components in parts by weight: 1-12 parts of alkylbenzene sulfonate, 1-20 parts of alkyl sulfonate, 1-32 parts of olefin sulfonate, 1-40 parts of alkanolamide polyoxyethylene ether compounds and 2-40 parts of low molecular alcohol;
wherein the low molecular alcohol is selected from C3-C10The alkanolamide polyoxyethylene ether compound is at least one compound selected from compounds with a structural formula shown as I:
Figure BDA0002626239090000021
in the formula I, m and n are selected from 0-15, but cannot be 0 at the same time, and when m and n are not 0, m is equal to n; r1 is selected from C8～C22One of the alkyl groups of (a); r2Selected from hydrogen or ester groups.
Preferably, in the formula I, m and n are selected from 0-10 but cannot be 0 at the same time, and when m and n are not 0, m is equal to n; r1Is selected from C 16～C20One of alkyl groups of (a); r is2Selected from hydrogen or ester groups. More preferably, in the formula I, m and n are independently selected from 1-5, and m ═ n; r is1Is selected from C12～C18One of the alkyl groups of (a); r2Selected from ester groups. Optionally, the composition comprises the following components in percentage by weight: 1 to 12 weight percent of alkylbenzene sulfonate, 1 to 20 weight percent of alkyl sulfonate, 1 to 32 weight percent of olefin sulfonate, 1 to 40 weight percent of alkanolamide polyoxyethylene ether compound, 2 to 40 weight percent of low molecular alcohol and the balance of water.
Preferably, the composition comprises the following components in percentage by weight: 4 to 7 weight percent of alkylbenzene sulfonate, 5 to 15 weight percent of alkyl sulfonate, 25 to 29 weight percent of olefin sulfonate, 20 to 30 weight percent of alkanolamide polyoxyethylene ether compound, 6 to 10 weight percent of low molecular alcohol and the balance of water. The composite oil displacement agent has the advantages of good and obvious water and oil reduction effect, high oil displacement efficiency and strong oil reservoir adaptability, thereby reducing the mining difficulty, greatly improving the crude oil recovery ratio and having better popularization prospect.
More preferably, the composition comprises the following components in percentage by weight: 5 wt% of alkylbenzene sulfonate, 10 wt% of alkyl sulfonate, 27 wt% of olefin sulfonate, 25 wt% of alkanolamide polyoxyethylene ether compounds, 8 wt% of low molecular alcohol and 25 wt% of water. The composite oil displacement agent has the advantages of optimal and obvious water and oil reduction and increase effects, high oil displacement efficiency and strong oil reservoir adaptability, thereby reducing the mining difficulty, greatly improving the crude oil recovery ratio and having better popularization prospect.
Optionally, the oil displacement complexing agent has a solid content of 30 wt% to 60 wt%, a pH value of 6 to 10, and a solubility of not less than 10g/100g water. Preferably, the oil displacement complexing agent has the solid content of 40-50 wt%, the pH value of 8-10 and the solubility of not less than 10g/100g of water.
Optionally, the alkyl group of the alkylbenzene sulfonate is selected from C8-C24One of alkyl, the alkyl in the alkyl sulfonate is C8-C24Alkyl, the olefin in the olefin sulfonate is selected from C10-C22One of the alkenyl radicals, said R1Is selected from C12-C20One of the alkyl groups.
Preferably, the alkyl group of the alkylbenzene sulfonate is selected from C10-C22One of alkyl, the alkyl in the alkyl sulfonate is C10-C22Alkyl, the olefin in the olefin sulfonate is selected from C12-C16One of alkylene, the low molecular alcohol is selected from C3-C8The hydrocarbon alcohol of (1).
More preferably, the alkyl group in the alkylbenzene sulfonate is C12-C18Alkyl, the alkyl in the alkyl sulfonate is C12-C18Alkyl, the olefin in the olefin sulfonate is C12-C16Alkylene group of said R1Is selected from C12-C18One of the alkyl groups, the low molecular alcohol is propanol.
Alternatively, the alkyl group in the alkylbenzene sulfonate, the alkyl group in the alkyl sulfonate, and R1At least one independently selected from the group consisting of alkyl groups comprising linear, branched, and cyclic structures; and/or
Alkyl group in the alkylbenzene sulfonate, alkyl group in the alkyl sulfonate and R1Independently selected from the group consisting of halogen, alkyl or alkoxy.
Alternatively, the alkylbenzene sulfonate is prepared by reacting an aromatic hydrocarbon with SO in a chlorinated alkane environment3Or sulfonating chlorosulfonic acid, and neutralizing with alkali;
the alkyl sulfonate is prepared by reacting alkane with SO in chloroalkane environment3Or chlorineSulfonating sulfonic acid, and neutralizing with alkali to obtain;
the olefin sulfonate is prepared by reacting olefin with SO in chloroalkane environment3Or sulfonating chlorosulfonic acid, and neutralizing with alkali; and/or
The alkanolamide polyoxyethylene ether compound is prepared by polymerizing alkanolamide and epoxide or further performing anionization.
Optionally, the low molecular alcohol is propanol or octanol;
the alkylbenzene sulfonate, the alkyl sulfonate and the olefin sulfonate are independently selected from sodium salt, potassium salt or ammonium salt; and/or
The R is2Is an ester group, and includes carboxylate, sulfate and phosphate groups. The alcohol amide polyoxyethylene ether compound can be an alcohol amide polyoxyethylene ether ester compound, the alcohol amide polyoxyethylene ether ester compound is an alcohol amide polyoxyethylene ether ester salt under alkaline conditions, and the salt can be an alkali metal salt, preferably a sodium salt, a potassium salt and an ammonium salt, and more preferably a sodium salt. Under alkaline condition, the ester group is a sulfate ester with a structural formula shown in formula II, the phosphate ester with a structural formula shown in formula III,
Figure BDA0002626239090000041
According to another aspect of the application, a preparation method of the flooding complex agent for the heavy oil reservoir is provided, and comprises the following steps:
adding the alkylbenzene sulfonate, the alkyl sulfonate, the olefin sulfonate and the low molecular alcohol into water, stirring for not less than 20min, adding the alkanolamide polyoxyethylene ether compound, and uniformly mixing.
According to still another aspect of the application, the application of a flooding compound agent of a heavy oil reservoir in tertiary oil recovery is provided, wherein the flooding compound agent is selected from one of the flooding compound agents of the heavy oil reservoir and the flooding compound agent prepared by the method.
Preferably, the relative density of the crude oil in the heavy oil reservoir is 0.9200-0.9900 mg/L, and the viscosity at 50 ℃ is 100-100000 mPa.s.
More preferably, the relative density of the crude oil in the heavy oil reservoir is 0.9300-0.9800 mg/L, and the viscosity at 50 ℃ is 1000-50000 mPa.s.
Optionally, the stratum water salinity of the heavy oil reservoir is not lower than 2000 mg/L. Preferably, the stratum water salinity of the heavy oil reservoir is 3000-30000 mg/L.
Benefits of the present application include, but are not limited to:
1. according to the oil displacement complexing agent for the heavy oil reservoir, based on the oil reservoir conditions of the mining area, according to the results of indoor tests and numerical simulation, the oil displacement complexing agent can reduce the oil-water interfacial tension, reduce the viscosity of crude oil, obtain obvious effects of lowering water and increasing oil, and has high oil displacement efficiency and strong oil reservoir adaptability, thereby reducing the mining difficulty, greatly improving the crude oil recovery ratio and having good popularization prospect.
2. According to the oil displacement complexing agent for the heavy oil reservoir, the oil displacement complexing agent can reduce the viscosity of crude oil, especially the viscosity of the heavy oil, can improve the oil recovery rate of the heavy oil reservoir which is difficult to recover, and has the advantages of high stability, good salt tolerance and small using amount.
3. The oil displacement complexing agent for the heavy oil reservoir can be used as the oil displacement complexing agent for the heavy oil reservoir, can also be suitable for the thin oil reservoir, and has a wide application range.
4. According to the preparation method of the oil displacement complexing agent, the preparation method is simple in process, beneficial to operation and low in production cost.
5. According to the application of the oil displacement complexing agent for the heavy oil reservoir in tertiary oil recovery, the oil displacement complexing agent can reduce the oil-water interfacial tension, can reduce the viscosity of crude oil, obtains obvious effects of precipitation and oil increment, and has high oil displacement efficiency and strong oil reservoir adaptability, thereby reducing the mining difficulty, greatly improving the crude oil recovery ratio and having good popularization prospect.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Unless otherwise specified, the raw materials and catalysts in the examples of the present application were all purchased commercially.
EXAMPLE 1 preparation of starting Material
Sodium alkyl benzene sulfonates, sodium alkyl sulfonates, and sodium olefin sulfonates are commercially available.
The preparation method of the alkanolamide polyoxyethylene ether sulfate sodium salt compound is illustrated by taking R1 as C18, m is 3, n is 3 and R2 as an example, and the preparation method comprises the following steps:
1) suction and addition C18Adding fatty acid diethanolamide into a polymerization kettle, stirring, heating to 70-80 ℃, adding potassium hydroxide, and vacuumizing for dewatering for at least 1.5 hours until water is completely removed. Heating, introducing ethylene oxide, keeping the reaction temperature at 125 +/-5 ℃ and the reaction pressure at less than or equal to 0.3 MPa. After the completion of aging, the mixture was aged and absorbed for 1.5 hours and then vacuumed for 10 min.
2) And adding a mixed sulfamic acid and urea solution (catalyst) into the product, uniformly stirring, heating to 95 ℃, keeping the temperature, stirring for 1 hour, adding NaOH for neutralization to obtain a product No. 1, wherein the yield is 87%.
The reaction scheme equation is:
Figure BDA0002626239090000061
example 2 oil-displacing complex agent 1#
The oil displacement compound agent 1# comprises the following components in percentage by weight: c125 wt% of sodium alkyl benzene sulfonate and C1210 wt% of sodium alkylsulfonate, C12Olefin sodium sulfonate 27 wt%, C1225 wt% of alkanolamide polyoxyethylene ether, 8 wt% of propanol and 25 wt% of water.
C12R of sodium salt of alkanolamide polyoxyethylene ether sulfate 1Is C12Where m is 3, n is 3, R2 is sodium sulfate salt, the structural formula is:
Figure BDA0002626239090000062
the preparation method of the oil displacement compound agent 1# comprises the following steps:
proportionally adding water to reactor, and adding C12Sodium alkyl benzene sulfonate, C12Sodium alkylsulfonate, C12Sodium olefin sulfonate and propanol, stirring for 25min, and adding C12Adding alkanolamide polyoxyethylene ether sulfate sodium salt into a reactor, and stirring uniformly to obtain a yellow uniform liquid with good water solubility, the solubility of the yellow uniform liquid is not lower than 10g/100g of water, and the pH value is 8-10.
Example 3 oil-displacing Complex agent No. 2
The oil displacement compound agent 2# comprises the following components in percentage by weight: c125 wt% of sodium alkyl benzene sulfonate and C1210 wt% of sodium alkylsulfonate, C16Olefin sodium sulfonate 20 wt%, C1835 wt% of alkanolamide polyoxyethylene ether sulfate sodium salt, 7 wt% of propanol and 23 wt% of water.
C18R of sodium salt of alkanolamide polyoxyethylene ether sulfate1Is C18，m＝5，n＝5，R2Is sodium sulfate, and has a structural formula as follows:
Figure BDA0002626239090000071
the preparation method of the oil displacement compound agent 2# comprises the following steps:
proportionally adding water to reactor, and adding C12Sodium alkylbenzenesulfonate, C12Sodium alkylsulfonate, C16Sodium olefin sulfonate and propanol, stirring for 25min, and adding C18Adding alkanolamide polyoxyethylene ether sulfate sodium salt into a reactor, and stirring uniformly to obtain a yellow uniform liquid with good water solubility, the solubility of the yellow uniform liquid is not lower than 10g/100g of water, and the pH value is 8-10.
Example 4 oil-displacing Complex agent 3#
The oil displacement compound agent No. 3 comprises the following components in percentage by weight: c18Sodium alkyl benzene sulfonate 12 wt%, C18Sodium alkylsulfonate 20 wt%, C14Sodium olefin sulfonate 15 wt%, C1222 wt% of alkanolamide polyoxyethylene ether sulfate sodium salt, 4 wt% of propanol and 27 wt% of water.
C12R of sodium salt of alkanolamide polyoxyethylene ether sulfate1Is C12，m＝5，n＝5，R2Is sulfate sodium salt, and has a molecular formula:
Figure BDA0002626239090000072
the preparation method of the oil displacement compound agent 3# comprises the following steps:
proportionally adding water to reactor, and adding C18Sodium alkylbenzenesulfonate, C18Sodium alkylsulfonate, C14Sodium olefin sulfonate and propanol, stirring for 25min, and adding C12Adding alkanolamide polyoxyethylene ether sulfate sodium salt into a reactor, and stirring uniformly to obtain a yellow uniform liquid with good water solubility, the solubility of the yellow uniform liquid is not lower than 10g/100g of water, and the pH value is 8-10.
Embodiment 5 oil-displacing compound agent 4# -7 #, D1# -D3 #, and
according to the preparation method of the embodiment 2, oil displacement complexing agents 1# to 12# and D1# to D4# with different types and content compositions are provided, and the specific contents are shown in a table 1, wherein C in the tablenRefers to the number of carbon atoms in the alkyl or alkenyl group in the composition.
TABLE 1
Figure BDA0002626239090000073
Figure BDA0002626239090000081
Example 6
The test method comprises the following steps:
the interfacial tension test method comprises the following steps: the oil displacement complexing agent is prepared into 0.5 percent solution by using formation water, the interfacial tension between the solution and crude oil is measured by using a Texas500C type interfacial tensiometer at 60 ℃ (simulated surface temperature), and the interfacial tension value is calculated according to a formula provided by an instrument instruction.
The viscosity reduction rate test method comprises the following steps: the flooding complex agent is prepared into 0.5 percent solution by using formation water, the flooding complex agent 1# -12# and D1# -D4# prepared in the examples 2-5 are respectively added into crude oil according to the volume ratio of the crude oil to the flooding complex agent solution of 1:1 at 60 ℃ (simulated surface temperature), and the viscosity of a mixed system is measured by using a rotational viscometer after the mixture is stirred for 1.5 hours at 60 ℃.
The enhanced oil recovery test method comprises the following steps: the permeability is 500 +/-50 multiplied by 10-3μm2After drilling, cutting and washing oil, the air permeability and the saturated formation water are measured, and the pore volume and the porosity are measured. Saturated oil, water flooding to water content of 90%, injecting 0.3PV 0.5% flooding compound solution (flooding compound 1# -12#, D1# -D4# prepared in examples 2-5), transferring water flooding to water content of 99%, and calculating to improve recovery rate.
The interfacial tension, viscosity reduction rate and recovery ratio of a plurality of thick oil crude oils with different densities, viscosities and mineralization degrees are tested, and the relative density of the tested crude oil is 0.9785mg/L, the viscosity is 54230mPa.s at 50 ℃ and the mineralization degree is 15134 mg/L.
The oil recovery effect of the oil displacement compound agent in the embodiment on the heavy oil reservoir is illustrated by taking the oil displacement compound agent 1# -12# and the oil displacement compound agent D1# -D4# as examples, and the results are shown in Table 2.
TABLE 2
Figure BDA0002626239090000091
Figure BDA0002626239090000101
As can be seen from Table 2, after the oil displacement complexing agent prepared by the embodiment is added, the interfacial tension is greatly reduced, the viscosity is greatly reduced, and the effect of improving the recovery ratio is obvious.
The data in table 2 can be divided into three groups: 1# -8# is a first group, m and n are not 0, and the effect is good when m + n is small; the number 9# -12# is a second group, m is 0, n is changed in value, and the effect is poorer than that of the first group; d1# -D4# is the third group, R2The effect is worst when m and n are large. Optimum for specific crude oil, temperature and salinity conditionsThe value is 1# of oil displacement complexing agent: c125 wt% of sodium alkyl benzene sulfonate and C1210 wt% of sodium alkylsulfonate, C12Olefin sodium sulfonate 27 wt%, C12Alkanolamide polyoxyethylene ether sulfate sodium salt 25 wt% (m ═ 3, n ═ 3, R)2Sodium salt of sulfuric acid ester), 8 wt% propanol and 25 wt% water.
The oil displacement complexing agent in the embodiment is based on the oil reservoir conditions of an exploitation area, and according to the results of indoor tests and numerical simulation, the oil displacement complexing agent has the advantages that the oil-water interfacial tension can be reduced, the viscosity of crude oil can be reduced, the obvious water and oil reduction and increase effects are obtained, the oil displacement efficiency is high, the oil reservoir adaptability is high, the exploitation difficulty is reduced, the crude oil recovery rate is greatly improved, and the popularization prospect is good.
The above description is only an example of the present application, and the protection scope of the present application is not limited by these specific examples, but is defined by the claims of the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the technical idea and principle of the present application should be included in the protection scope of the present application.

Claims (15)

1. An oil displacement complexing agent for a heavy oil reservoir is characterized by comprising the following components in parts by weight: 1-12 parts of alkylbenzene sulfonate, 1-20 parts of alkyl sulfonate, 1-32 parts of olefin sulfonate, 1-40 parts of alkanolamide polyoxyethylene ether compound and 2-40 parts of low molecular alcohol;
wherein the low molecular alcohol is selected from C3-C10 hydrocarbon alcohol, and the alkanolamide polyoxyethylene ether compound is at least one selected from compounds with a structural formula shown as I:
Figure 242855DEST_PATH_IMAGE001
formula I
In the formula I, m and n are selected from 1-15, and m = n; r1 is one selected from C8-C22 alkyl; r2 is selected from hydrogen or an ester group.
2. The oil-displacing compound agent according to claim 1, which comprises the following components in percentage by weight: 1-12 wt% of alkylbenzene sulfonate, 1-20 wt% of alkyl sulfonate, 1-32 wt% of olefin sulfonate, 1-40 wt% of alkanolamide polyoxyethylene ether compound, 2-40 wt% of low molecular alcohol and the balance of water.
3. The flooding complex agent as claimed in claim 1, wherein the flooding complex agent comprises the following components in percentage by weight: 4-7 wt% of alkyl benzene sulfonate, 5-15 wt% of alkyl sulfonate, 25-29 wt% of olefin sulfonate, 20-30 wt% of alkanolamide polyoxyethylene ether compound, 6-10 wt% of low molecular alcohol and the balance of water.
4. The flooding complex agent as claimed in claim 1, wherein the flooding complex agent comprises the following components in percentage by weight: 5 wt% of alkylbenzene sulfonate, 10 wt% of alkyl sulfonate, 27 wt% of olefin sulfonate, 25 wt% of alkanolamide polyoxyethylene ether compounds, 8 wt% of low molecular alcohol and 25 wt% of water.
5. The oil displacement complex agent according to claim 2, wherein the oil displacement complex agent has a solid content of 30-60 wt%, a pH of = 6-10, and a solubility of not less than 10g/100g of water.
6. The flooding complex agent of any one of claims 1 to 5, wherein the alkyl group in the alkylbenzene sulfonate is selected from C8-C24 alkyl groups, the alkyl group in the alkylbenzene sulfonate is C8-C24 alkyl groups, the olefin in the olefin sulfonate is selected from C10-C22 olefin groups, and the R1 is selected from C12-C20 alkyl groups.
7. The flooding complex agent of any one of claims 1 to 5, wherein the alkyl group in the alkylbenzene sulfonate is selected from C10-C22 alkyl groups, the alkyl group in the alkylbenzene sulfonate is C10-C22 alkyl groups, the olefin in the olefin sulfonate is selected from C12-C16 olefin groups, and the low-molecular alcohol is selected from C3-C8 hydrocarbon-based alcohols.
8. The oil-displacing compound agent according to any one of claims 1 to 5, wherein an alkyl group in the alkylbenzene sulfonate is a C12-C18 alkyl group, an alkyl group in the alkyl sulfonate is a C12-C18 alkyl group, an olefin in the olefin sulfonate is a C12-C16 alkylene group, and the low molecular alcohol is propanol.
9. The flooding complex of claim 6, wherein the alkyl group of the alkylbenzene sulfonate, the alkyl group of the alkyl sulfonate, and R1 are independently at least one selected from the group consisting of alkyl groups comprising linear, branched, and cyclic structures; and/or
The alkyl group in the alkylbenzene sulfonate, the alkyl group in the alkyl sulfonate and R1 are independently selected from the group consisting of substituted by one or more substituents, the substituents being halogen, alkyl or alkoxy.
10. The oil displacement complex agent as claimed in claim 1, wherein the alkylbenzene sulfonate is prepared by sulfonating aromatic hydrocarbon with SO3 or chlorosulfonic acid in a chloroalkane environment and then neutralizing with alkali;
The alkyl sulfonate is prepared by sulfonating alkane with SO3 or chlorosulfonic acid in a chloroalkane environment and then neutralizing with alkali;
the olefin sulfonate is prepared by sulfonating olefin with SO3 or chlorosulfonic acid in a chloroalkane environment and then neutralizing with alkali; and/or
The alkanolamide polyoxyethylene ether compound is prepared by polymerizing alkanolamide and epoxide or further anionizing.
11. The flooding complex of claim 1, wherein the low molecular alcohol is propanol or octanol;
the alkylbenzene sulfonate, the alkyl sulfonate and the olefin sulfonate are independently selected from sodium salt, potassium salt or ammonium salt; and/or
The R2 is an ester group which is a sulfate or phosphate.
12. A method for preparing the flooding complex of a heavy oil reservoir according to any one of claims 1 to 11, characterized in that the preparation method comprises the following steps:
adding the alkylbenzene sulfonate, the alkyl sulfonate, the olefin sulfonate and the low molecular alcohol into water, stirring for not less than 20min, adding the alkanolamide polyoxyethylene ether compound, and uniformly mixing.
13. The application of the flooding complexing agent for heavy oil reservoirs in tertiary oil recovery is characterized in that the flooding complexing agent is one selected from the flooding complexing agent for heavy oil reservoirs according to any one of claims 1 to 10 and the flooding complexing agent prepared by the preparation method according to claim 12.
14. The use of claim 13, wherein the crude oil in the heavy oil reservoir has a relative density of 0.9200-0.9900 mg/L and a viscosity of 100-100000 mPa.s at 50 ℃.
15. The use of claim 13, wherein the heavy oil reservoir has a formation water salinity of not less than 2000 mg/L.
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CN103215019B (en) * 2012-12-17 2016-06-08 江南大学 The preparation of the compound alkali-free surfactant oil displacement of a kind of alkylolamides-sulfate and application
CN111019620A (en) * 2019-12-31 2020-04-17 田春来 Oil field flowback-free stratum blocking remover and blocking removing method thereof

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