CN113913173A - Emulsified oil displacement agent for water-drive development of thickened oil and performance evaluation method thereof - Google Patents
Emulsified oil displacement agent for water-drive development of thickened oil and performance evaluation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of thickened oil chemical flooding, in particular to an emulsified oil displacement agent for thickened oil water flooding development and a performance evaluation method thereof. The emulsified oil displacement agent comprises: 0.01-0.2% of hydroxysulfobetaine A, 0.01-0.2% of hydroxysulfobetaine B, 0.01-0.1% of polyoxyethylene ether surfactant, 0.01-0.1% of fluorocarbon surfactant and the balance of water. The evaluation method of the emulsified oil displacement agent is that the following evaluation standards are met: the viscosity reduction rate of emulsification is more than or equal to 85 percent, the dehydration rate of natural sedimentation is more than or equal to 80 percent, the viscosity reduction rate after adsorption is more than or equal to 80 percent, and the interfacial tension<1×10‑2mN/m, and the improvement amount of the oil displacement efficiency is more than or equal to 15 percent. Aiming at the crude oil physical properties and oil reservoir characteristics of different blocks, the performance evaluation method of the emulsified oil displacement agent for the water-drive heavy oil reservoir can quickly and preferably select the emulsified oil displacement agent with the maximized recovery ratio, and has important practical significance for the development of the water-drive heavy oil reservoir.
Description
Technical Field
The invention relates to the technical field of thickened oil chemical flooding, in particular to an emulsified oil displacement agent for thickened oil water flooding development and a performance evaluation method thereof.
Background
The water-flooding common thickened oil reserves of the victory oil field are rich. But the development and oil recovery speed of the water-flooding heavy oil reservoir is low, the recovery ratio is low, and the economic benefit is very low. The main reasons are the following: (1) the colloid and the asphaltene can agglomerate light components, the interface tension of the crude oil and the injected water is large, and the injected water is difficult to pull and separate oil drops from a large crude oil block. (2) The components of the thickened oil contain a large amount of colloid and asphaltene, so that the adhesion of the thickened oil on the surface of a rock is much larger than that of the thin oil, and the thickened oil is more difficult to strip from the surface of the rock; (3) the viscous finger of the water-drive thickened oil is strong, the water channeling is serious, and the water-drive wave is small.
In order to improve the recovery efficiency, an emulsified oil displacement agent is often adopted in the actual production. However, because of the differences in the physical properties of crude oil in different blocks, an emulsified oil displacement agent cannot achieve a good effect in each block of oil reservoir at all. In order to maximize the recovery ratio, the chemical components and the content proportion thereof in the emulsified oil displacement agent need to be adjusted according to the components of the crude oil. The existing commercialized surfactants, emulsifiers and the like are various and can be combined to obtain various emulsified oil displacement agents. How to rapidly screen and obtain an emulsion oil-displacing agent capable of most effectively increasing the recovery ratio? At present, there is no screening method or standard for this.
In the prior art, the production of various surfactants for improving the recovery ratio is limited to a key evaluation index. Chinese patent CN104371689B discloses an ultra-low interfacial tension surfactant compound system, which focuses on investigating the oil-water interfacial tension performance of the compound system; chinese patent CN102604618B discloses a viscosity reducer for crude oil in a cold production formation of thick oil, and only the viscosity reduction effect is evaluated; chinese patent CN103820095B discloses various hydroxysulfobetaine viscoelastic surfactants and compositions thereof, which have been tested and studied for the interfacial tension, viscosity, anti-adsorption performance, oil displacement efficiency, etc. of the composition solution, however, the interfacial tension test result of the composition compound system with the best viscosity stability is not the best, and although a plurality of test indexes are given, people have difficulty in selecting a system with better practical application effect.
Through years of research and production experience, the inventor gradually finds that only one performance index of products such as oil displacement agents or viscosity reducers is researched, and beneficial or optimal practical application effects are not necessarily generated. Therefore, it is highly desirable to provide an effective method or criteria for evaluating the performance of an flooding agent.
Disclosure of Invention
The invention mainly aims to provide a method for effectively evaluating the performance of an oil displacing agent and provide an emulsified oil displacement agent for water-flooding development of thickened oil with excellent comprehensive evaluation.
In order to achieve the purpose, the invention adopts the following technical scheme:
an emulsified oil displacement agent for water-flooding development of thickened oil comprises the following components in percentage by mass: 0.01-0.2% of hydroxysulfobetaine A, 0.01-0.2% of hydroxysulfobetaine B, 0-0.1% of polyoxyethylene ether surfactant, 0-0.1% of fluorocarbon surfactant and the balance of water.
In a preferred embodiment of the present invention, the number n of carbon atoms in the alkyl group in hydroxysulfobetaine A is 16 to 18.
In a preferred embodiment of the present invention, the number of carbon atoms of the alkyl group in hydroxysulfobetaine B is 12 to 14.
As a preferred embodiment of the present invention, the polyoxyethylene ether surfactant includes: fatty alcohol polyoxyethylene ether (AEO), nonylphenol polyoxyethylene ether (NP-TX series), and octylphenol polyoxyethylene ether (OP series).
As a preferred technical scheme of the invention, the fluorocarbon surfactant is polyfluoroalkyl betaine.
As a preferable technical scheme of the invention, the emulsified oil displacement agent for water flooding development of the thickened oil comprises the following components and the dosage thereof: 0.15% of octadecyl hydroxysulfobetaine, 0.1% of dodecyl hydroxysulfobetaine, 0.05% of fatty alcohol-polyoxyethylene ether, 0.05% of fluorocarbon surfactant and the balance of water.
The invention also provides a performance evaluation method of the emulsified oil displacement agent for the water-drive development of the thickened oil, which comprises the following evaluation indexes: the viscosity reduction rate by emulsification, the dehydration rate by natural sedimentation, the viscosity reduction rate after adsorption, the interfacial tension and the improvement amount of the oil displacement efficiency, and the product meeting the evaluation index standards is the standard product.
As a preferable technical scheme of the invention, the evaluation standard is as follows:
the viscosity reduction rate of emulsification is more than or equal to 85 percent, the dehydration rate of natural sedimentation is more than or equal to 80 percent, the viscosity reduction rate after adsorption is more than or equal to 80 percent, and the interfacial tension<1×10-2mN/m, and the improvement amount of the oil displacement efficiency is more than or equal to 15 percent.
As a further preferable technical solution of the present invention, the method for establishing the evaluation criterion includes the steps of:
1) analyzing crude oil components including gums, asphaltenes, saturated hydrocarbons, and aromatic hydrocarbons;
2) determining and selecting a surfactant based on the contents of colloid, asphaltene, saturated hydrocarbon and aromatic hydrocarbon components in the crude oil and the action mechanism of different surfactants on crude oil components;
3) the selected surfactant is prepared into the emulsified oil displacement agent with different performance indexes, wherein the performance indexes are respectively as follows: emulsion reducing agentViscosity is greater than or equal to 95 percent and is 1 multiplied by 10-1Interfacial tension of mN/m or less<1 mN/m; the viscosity reducing rate of emulsification is more than or equal to 95 percent and is 1 multiplied by 10-2Interfacial tension of mN/m or less<1×10-1mN/m; the viscosity reducing rate of emulsification is more than or equal to 95 percent and is 1 multiplied by 10-3Interfacial tension of mN/m or less<1×10-2mN/m; the viscosity reducing rate of emulsification is more than or equal to 30 percent and is 1 multiplied by 10-1Interfacial tension of mN/m or less<1 mN/m; the viscosity reducing rate of emulsification is more than or equal to 30 percent and is 1 multiplied by 10-2Interfacial tension of mN/m or less<1×10-1mN/m; the viscosity reducing rate of emulsification is more than or equal to 30 percent and is 1 multiplied by 10-3Interfacial tension of mN/m or less<1×10-2mN/m；
4) The method comprises the steps of establishing a change rule of emulsification viscosity reduction rate, interfacial tension and oil displacement efficiency by using prepared emulsification oil displacement agents with different properties, and determining the contribution of the emulsification viscosity reduction rate and the interfacial tension of different reservoirs to the improvement of the oil displacement efficiency; and determining the combination relation of the emulsification viscosity reduction rate and the interfacial tension when the recovery ratio of different reservoirs is maximized.
And 5, establishing a change rule of the emulsification viscosity reduction rate, the interfacial tension and the natural sedimentation dehydration rate, and determining the technical limits of the emulsification viscosity reduction rate, the natural sedimentation dehydration rate, the interfacial tension and the viscosity reduction rate after adsorption to obtain the product.
As a preferable technical solution of the present invention, the evaluation index further includes: the content of organic chlorine is 0.0 percent; appearance: uniform liquid, no impurity and no pungent smell; the pH value is 6.0-8.0; solubility, dissolution in water, no precipitation.
Compared with the prior art, the invention has the following beneficial effects:
in actual production and research, the inventor finds that the oil displacement effect of an oil displacement agent with excellent performance index in practical application is not ideal, for example, the interfacial tension is more than or equal to 1 multiplied by 10-1The improvement amount of the oil displacement efficiency of the oil displacement agent with mN/m is only about 5 percent, and the interfacial tension is far less than or equal to 1 x 10-2And the oil displacement effect of the oil displacement agent is mN/m. In order to effectively evaluate and screen the oil-displacing agent, the invention provides a performance evaluation method of the emulsified oil-displacing agent for the water-drive heavy oil reservoir, which scientifically integrates the emulsification viscosity reduction rate, the natural sedimentation dehydration rate, the viscosity reduction rate after adsorption, the interfacial tension and the oil displacement efficiency improvement amount as evaluation indexes, and determines the defined values of all parametersThe emulsified oil displacement agent meeting the evaluation index of the evaluation method can effectively improve the recovery ratio of crude oil in actual production; aiming at the crude oil physical properties and oil reservoir characteristics of different blocks, the performance evaluation method of the emulsified oil displacement agent for the water-drive heavy oil reservoir can quickly and preferably select the emulsified oil displacement agent with the maximized recovery ratio, and has important practical significance for the development of the water-drive heavy oil reservoir.
The emulsified oil displacement agent for the water-drive development of the thickened oil provided by the invention has simple components and has the following three beneficial effects:
1) strong oil-water emulsification, the oil-water emulsification viscosity reduction rate under the oil reservoir condition reaches more than 95 percent, so that the thickened oil is emulsified into small oil drops which are dispersed in water and are displaced out of the stratum along with water flow;
2) the emulsified oil displacement agent can reduce the oil-water interfacial tension to 1 x 10-2The mN/m is less than that, so that a large crude oil is easy to be stretched and deformed to form oil drops or is easy to be deformed to pass through a throat; meanwhile, the oil drops dispersed in water are more stable due to low interfacial tension;
3) the rock surface can be changed from oleophilic to weak hydrophilic or neutral.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of an evaluation method and criteria formulation in accordance with an embodiment of the present invention;
FIG. 2 is an injection-production curve of an emulsified oil displacement test well group.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
The emulsified oil displacement agent for displacing thick oil water is prepared from the following components in percentage by mass: 0.05% of octadecyl hydroxyl sulfobetaine, 0.15% of dodecyl hydroxyl sulfobetaine, 0.05% of fatty alcohol-polyoxyethylene ether, 0.05% of polyfluoroalkyl betaine and the balance of water, and is marked as J1 emulsifier.
Example 2
The emulsified oil displacement agent for displacing thick oil water is prepared from the following components in percentage by mass: 0.05% of octadecyl hydroxyl sulfobetaine, 0.1% of dodecyl hydroxyl sulfobetaine, 0.1% of fatty alcohol-polyoxyethylene ether, 0.05% of polyfluoroalkyl betaine and the balance of water, and is marked as J2 emulsifier.
Example 3
The emulsified oil displacement agent for displacing thick oil water is prepared from the following components in percentage by mass: 0.15% of octadecyl hydroxyl sulfobetaine, 0.05% of dodecyl hydroxyl sulfobetaine, 0.01% of fatty alcohol-polyoxyethylene ether, 0.05% of polyfluoroalkyl betaine and the balance of water, and is marked as J3 emulsifier.
Example 4
The emulsified oil displacement agent for displacing thick oil water is prepared from the following components in percentage by mass: 0.2% of octadecyl hydroxyl sulfobetaine, 0.2% of dodecyl hydroxyl sulfobetaine, 0.05% of polyfluoroalkyl betaine and the balance of water, and is marked as J4 emulsifier.
Example 5
The emulsified oil displacement agent for displacing thick oil water is prepared from the following components in percentage by mass: 0.15% of octadecyl hydroxyl sulfobetaine, 0.1% of dodecyl hydroxyl sulfobetaine, 0.05% of fatty alcohol-polyoxyethylene ether, 0.05% of polyfluoroalkyl betaine and the balance of water, and is marked as J5 emulsifier.
Example 6
The emulsified oil displacement agent for displacing thick oil water is prepared from the following components in percentage by mass: 0.15% of hexadecyl hydroxy sulfobetaine, 0.1% of tetradecyl hydroxy sulfobetaine, 0.05% of fatty alcohol-polyoxyethylene ether, 0.05% of polyfluoroalkyl betaine and the balance of water, and is marked as J6 emulsifier.
Example 7
The emulsified oil displacement agent for displacing thick oil water is prepared from the following components in percentage by mass: cetyl hydroxy sulphobetaine 0.01%, tetradecyl hydroxy sulphobetaine 0.01%, fatty alcohol-polyoxyethylene ether 0.05%, polyfluoroalkyl betaine 0.05%, and water in balance, and is marked as J7 emulsifier.
Comparative example 1
The emulsified oil displacement agent for displacing thick oil water is prepared from the following components in percentage by mass: octadecyl hydroxy sulfobetaine 0.4%, polyfluoroalkyl betaine 0.05%, and water in balance, and is marked as J8 emulsifier.
Comparative example 2
The emulsified oil displacement agent for displacing thick oil water is prepared from the following components in percentage by mass: dodecyl hydroxy sulfobetaine 0.4%, polyfluoroalkyl betaine 0.05%, and water in balance, and is marked as J9 emulsifier.
Example 10
As shown in fig. 1, fig. 1 is a flowchart of the evaluation method and the criteria formulation.
Step 1, analyzing four components of crude oil, including colloid, asphaltene, saturated hydrocarbon and aromatic hydrocarbon.
And 2, determining the mass fractions of different surfactants based on the four-component content and the action mechanisms of different surfactants on different components.
Step 3, preparing the surfactant in the mass fraction range of different surfactantsEmulsified oil displacement agents with different performance indexes. The performance indexes are respectively as follows: the viscosity reducing rate of emulsification is more than or equal to 95 percent and is 1 multiplied by 10-1Interfacial tension of mN/m or less<1 mN/m; the viscosity reducing rate of emulsification is more than or equal to 95 percent and is 1 multiplied by 10-2Interfacial tension of mN/m or less<1×10-1mN/m; the viscosity reducing rate of emulsification is more than or equal to 95 percent and is 1 multiplied by 10-3Interfacial tension of mN/m or less<1×10- 2mN/m; the viscosity reducing rate of emulsification is more than or equal to 30 percent and is 1 multiplied by 10-1Interfacial tension of mN/m or less<1 mN/m; the viscosity reducing rate of emulsification is more than or equal to 30 percent and is 1 multiplied by 10-2Interfacial tension of mN/m or less<1×10-1mN/m; the viscosity reducing rate of emulsification is more than or equal to 30 percent and is 1 multiplied by 10-3Interfacial tension of mN/m or less<1×10-2mN/m。
And 4, establishing a change rule of the emulsification viscosity reduction rate, the interfacial tension and the oil displacement efficiency by using the prepared emulsification oil displacement agents with different properties. And the contribution of the emulsification viscosity reduction rate and the interfacial tension of different reservoirs to the improvement of the oil displacement efficiency is determined. And determining the combination relation of the emulsification viscosity reduction rate and the interfacial tension when the recovery ratio of different reservoirs is maximized.
And 5, establishing a change rule of the emulsification viscosity reduction rate, the interfacial tension and the natural sedimentation dehydration rate. Determining the technical limits of parameters such as emulsification viscosity reduction rate, natural sedimentation dehydration rate, interfacial tension, viscosity reduction rate after adsorption and the like.
And 6, establishing a set of performance evaluation method of the emulsified oil displacement agent for the water-flooding heavy oil reservoir. Specific evaluation indexes are shown in table 1 below:
table 1 performance evaluation index of emulsified oil displacement agent for water-flooding heavy oil reservoir
And 7, evaluating the performance of the J1-J9 emulsified oil-displacing agent according to the formed evaluation technical indexes, wherein the evaluation results are shown in the following table 2.
TABLE 2 summary of evaluation results of various emulsified oil-displacing agents
As can be seen from Table 2, J4 and J5 meet the criteria of the present invention. The screened J5 emulsified oil displacement agent has good application effect in a plurality of blocks such as gold 8 and the like. 2 well groups are implemented in 1 month in 2019, daily oil production is increased by 16 tons, the peak value of daily oil is 2.5 times, the maximum water content is reduced by 8 percent, and 1834 tons of oil are increased in an accumulated manner, so that a better application effect is achieved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. An emulsified oil displacement agent for water-drive development of thickened oil is characterized by comprising the following components in percentage by mass: 0.01-0.2% of hydroxysulfobetaine A, 0.01-0.2% of hydroxysulfobetaine B, 0.01-0.1% of polyoxyethylene ether surfactant, 0.01-0.1% of fluorocarbon surfactant and the balance of water.
2. The emulsified oil-displacing agent for thickened oil water displacement according to claim 1, wherein n, the number of carbon atoms of the alkyl group in hydroxysulfobetaine a is 16 to 18.
3. The emulsified oil-displacing agent for thickened oil water displacement according to claim 1, wherein the number of carbon atoms of the alkyl group in the hydroxysulfobetaine B is 12 to 14.
4. The emulsified oil displacement agent for thickened oil water displacement according to claim 1, wherein the polyoxyethylene ether surfactant comprises: fatty alcohol-polyoxyethylene ether, nonylphenol polyoxyethylene ether and octylphenol polyoxyethylene ether.
5. The emulsified oil displacement agent for thickened oil water displacement according to claim 1, wherein the fluorocarbon surfactant is: a polyfluoroalkyl betaine.
6. The emulsified oil displacement agent for thickened oil water displacement according to claim 1, which is characterized by comprising the following components and the amounts thereof: 0.15% of octadecyl hydroxysulfobetaine, 0.1% of dodecyl hydroxysulfobetaine, 0.05% of fatty alcohol-polyoxyethylene ether, 0.05% of fluorocarbon surfactant and the balance of water.
7. An evaluation method of the performance of an emulsified oil-displacing agent suitable for the flooding of a thick oil water as described in any one of claims 1 to 6, characterized in that the evaluation index comprises: the viscosity reduction rate by emulsification, the dehydration rate by natural sedimentation, the viscosity reduction rate after adsorption, the interfacial tension and the improvement amount of the oil displacement efficiency, and the product meeting the evaluation index standards is the standard product.
8. The evaluation method according to claim 7, wherein the evaluation criteria are:
the viscosity reduction rate of emulsification is more than or equal to 85 percent, the dehydration rate of natural sedimentation is more than or equal to 80 percent, the viscosity reduction rate after adsorption is more than or equal to 80 percent, and the interfacial tension<1×10- 2mN/m, and the improvement amount of the oil displacement efficiency is more than or equal to 15 percent.
9. The evaluation method according to claim 8, wherein the method for making the evaluation criterion comprises the steps of:
1) analyzing crude oil components including gums, asphaltenes, saturated hydrocarbons, and aromatic hydrocarbons;
2) determining and selecting a surfactant based on the contents of colloid, asphaltene, saturated hydrocarbon and aromatic hydrocarbon components in the crude oil and the action mechanism of different surfactants on crude oil components;
3) the selected surfactant is prepared into the emulsified oil displacement agent with different performance indexes, wherein the performance indexes are respectively as follows: the viscosity reducing rate of emulsification is more than or equal to 95 percent and is 1 multiplied by 10-1Interfacial tension of mN/m or less<1 mN/m; the viscosity reducing rate of emulsification is more than or equal to 95 percent and is 1 multiplied by 10-2Interface tension of mN/m ≤Force of<1×10-1mN/m; the viscosity reducing rate of emulsification is more than or equal to 95 percent and is 1 multiplied by 10-3Interfacial tension of mN/m or less<1×10-2mN/m; the viscosity reducing rate of emulsification is more than or equal to 30 percent and is 1 multiplied by 10-1Interfacial tension of mN/m or less<1 mN/m; the viscosity reducing rate of emulsification is more than or equal to 30 percent and is 1 multiplied by 10-2Interfacial tension of mN/m or less<1×10-1mN/m; the viscosity reducing rate of emulsification is more than or equal to 30 percent and is 1 multiplied by 10-3Interfacial tension of mN/m or less<1×10-2mN/m；
4) The method comprises the steps of establishing a change rule of emulsification viscosity reduction rate, interfacial tension and oil displacement efficiency by using prepared emulsification oil displacement agents with different properties, and determining the contribution of the emulsification viscosity reduction rate and the interfacial tension of different reservoirs to the improvement of the oil displacement efficiency; and determining the maximum emulsification viscosity reduction rate and interfacial tension of different reservoir recovery factors.
And 5, establishing a change rule of the emulsification viscosity reduction rate, the interfacial tension and the natural sedimentation dehydration rate, and determining the technical limits of the emulsification viscosity reduction rate, the natural sedimentation dehydration rate, the interfacial tension and the viscosity reduction rate after adsorption to obtain the product.
10. The evaluation method according to claim 7, wherein the evaluation index further includes: the content of organic chlorine is 0.0 percent; appearance: uniform liquid, no impurity and no pungent smell; the pH value is 6.0-8.0; solubility, dissolution in water, no precipitation.
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