CN107880865B - Low-interfacial-tension foam oil displacement agent and preparation method thereof - Google Patents
Low-interfacial-tension foam oil displacement agent and preparation method thereof Download PDFInfo
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- CN107880865B CN107880865B CN201711056035.7A CN201711056035A CN107880865B CN 107880865 B CN107880865 B CN 107880865B CN 201711056035 A CN201711056035 A CN 201711056035A CN 107880865 B CN107880865 B CN 107880865B
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- 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
Abstract
The invention provides a low interfacial tension foam oil displacement agent and a preparation method thereof. The low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 30-50% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 10-25% of sodium dodecyl polyoxyethylene ether sulfate, 10-15% of fluorocarbon surfactant and the balance of water; wherein the betaine comprises one or more of dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine. The low-interfacial-tension foam oil displacement agent has good interfacial activity, high foaming performance and good oil displacement capacity. The oil displacement agent with foaming property and interfacial activity has the characteristics of easily available raw materials, low cost, simple preparation process and the like, can reduce the oil-water interfacial tension and improve the oil displacement efficiency, can improve the sweep efficiency, achieves the aim of obviously improving the recovery ratio, and is suitable for being applied and popularized in oil fields.
Description
Technical Field
The invention belongs to the technical field of oil displacement by oil field chemistry, and relates to a low interfacial tension foam oil displacement agent and a preparation method thereof.
Background
Most oil fields in China are in a high water-cut period, and the effect of extending the conventional water drive mode on greatly improving the crude oil recovery ratio is limited. According to analysis of influence factors on the sweep efficiency and the oil displacement efficiency, the influence factors on the sweep efficiency and the oil displacement efficiency need to be considered when the recovery ratio of the crude oil is improved. The conventional surfactant can reduce the oil-water interfacial tension and improve the oil washing effect, but has no profile control effect; the conventional foaming agent has the functions of profile control, plugging and increasing sweep efficiency, but has no obvious oil washing effect. The low interfacial tension foam flooding system is a flooding system developed on the basis of a surfactant system and a foaming agent, can reduce the oil-water interfacial tension and improve the flooding efficiency, and can improve the sweep efficiency at the same time, thereby achieving the purpose of obviously improving the recovery ratio.
The low-interfacial-tension foam oil displacement agent disclosed by the invention has good interfacial activity and good foam performance, so that good oil washing performance is realized, a good profile control effect is realized, and the low-interfacial-tension foam oil displacement agent has an important significance for improving the crude oil recovery rate in the subsequent development of a high-water-content oil field.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention aims to provide a low interfacial tension foam oil displacement agent and a preparation method thereof. The low interfacial tension foam oil displacement agent has good interfacial activity and high foam performance, and can reduce the oil-water interfacial tension value to 10-2The mN/m level effectively performs profile control and oil displacement and improves the oil well recovery ratio.
In order to achieve the above purpose, the invention provides a low interfacial tension foam oil displacement agent, which comprises the following components in percentage by mass: 30-50% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 10-25% of sodium dodecyl polyoxyethylene ether sulfate, 10-15% of fluorocarbon surfactant and the balance of water;
wherein the betaine comprises one or more of dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine.
The series of alkyl amide propyl hydroxypropyl sulfoalkyl betaines have good foaming performance and good interfacial activity. The dodecyl hydroxypropyl phosphate betaine has good foam-assisting performance.
The low-interfacial-tension foam oil displacement agent is light yellow transparent and uniform liquid in appearance, and the surfactant with better single performance is compounded to generate a synergistic effect, so that the obtained low-interfacial-tension foam oil displacement agent system has better interfacial activity and foam performance, the foaming volume of the low-interfacial-tension foam oil displacement agent system can reach more than 5 times of the volume of an initial solution, and the oil-water content can be effectively reducedInterfacial tension value of 10-2mN/m level.
According to the specific embodiment of the invention, preferably, the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 30-50% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 10-25% of sodium dodecyl polyoxyethylene ether sulfate, 10-15% of fluorocarbon surfactant and the balance of water;
wherein the betaine is formed by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2 (1-3) to (1-3).
According to the specific embodiment of the invention, preferably, the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 30-50% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 10-25% of sodium dodecyl polyoxyethylene ether sulfate, 10-15% of fluorocarbon surfactant and the balance of water;
wherein the betaine is prepared by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2:3: 1.
According to a particular embodiment of the present invention, preferably, said fluorocarbon surfactant comprises an amphoteric perfluoroalkyl ether betaine surfactant. Preferably a product F-1012 from shanghai brightness science and technology ltd. The betaine type fluorocarbon surfactant with an amphoteric structure has good interfacial activity and can effectively reduce the oil-water interfacial tension.
According to the specific embodiment of the invention, preferably, the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 50% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 25% of sodium dodecyl polyoxyethylene ether sulfate, 15% of amphoteric perfluoroalkyl ether betaine surfactant and the balance of water;
wherein the betaine is prepared by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2:3: 1.
According to the specific embodiment of the invention, preferably, the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 30% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 10% of sodium dodecyl polyoxyethylene ether sulfate, 10% of amphoteric perfluoroalkyl ether betaine surfactant and the balance of water;
wherein the betaine is prepared by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2:3: 1.
According to the specific embodiment of the invention, preferably, the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 40% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 20% of sodium dodecyl polyoxyethylene ether sulfate, 13% of amphoteric perfluoroalkyl ether betaine surfactant and the balance of water;
wherein the betaine is prepared by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2:3: 1.
According to the specific embodiment of the invention, preferably, the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 50% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 20% of sodium dodecyl polyoxyethylene ether sulfate, 10% of amphoteric perfluoroalkyl ether betaine surfactant and the balance of water;
wherein the betaine is prepared by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2:3: 1.
The invention also provides a preparation method of the low interfacial tension foam oil displacement agent, which comprises the following steps:
betaine, dodecyl hydroxypropyl phosphate betaine, dodecyl polyoxyethylene ether sodium sulfate, fluorocarbon surfactant and water are sequentially added into a reaction kettle at 45-50 ℃, and then the residual amount of water is gradually added under the stirring speed of 400-plus-material 500r/min to completely dissolve the reagent until the mixture is uniformly stirred to obtain the low-interfacial tension foam oil displacement agent.
The invention also provides application of the low interfacial tension foam oil displacement agent in the field of crude oil exploitation, and when the low interfacial tension foam oil displacement agent is applied, the mass concentration of the low interfacial tension foam oil displacement agent in an aqueous solution is 0.5-1.0%.
Compared with the existing foam oil-displacing agent, the low interfacial tension foam oil-displacing agent provided by the invention has the following beneficial effects:
(1) the low interfacial tension foam oil displacement agent provided by the invention does not contain alkali and has no harm to the stratum;
(2) the low-interfacial-tension foam oil-displacing agent provided by the invention has the advantages that the adopted chemicals are easily available in source and low in cost;
(3) the low-interfacial-tension foam oil displacement agent provided by the invention is widely applied, has good foaming performance at the formation temperature of 45-90 ℃, can reach more than 5 times of the volume of the initial solution, has good interfacial activity, and can effectively reduce the oil-water interfacial tension value to 10-2mN/m level.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited thereto.
Example 1
The embodiment provides a low interfacial tension foam oil displacement agent, which comprises the following components in percentage by weight: 50% of betaine compound, 5% of dodecyl hydroxypropyl phosphate betaine, 25% of dodecyl polyoxyethylene ether sodium sulfate, 15% of fluorocarbon surfactant and 5% of water.
Wherein the fluorocarbon surfactant is amphoteric perfluoroalkyl ether betaine surfactant, namely product F-1012 provided by Shanghai Ying Zhengzhi Co., Ltd; the betaine compound is prepared by compounding dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C according to the mass ratio of A to B to C to 2 to 3 to 1.
The low interfacial tension foam oil displacement agent of the present example was prepared by the following steps:
preparing a betaine compound from dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C according to the mass ratio of A: B: C: 2:3: 1;
adding 50% of betaine compound, 5% of dodecyl hydroxypropyl phosphate betaine, 25% of dodecyl polyoxyethylene ether sodium sulfate, 15% of fluorocarbon surfactant and 5% of water into a beaker according to the weight percentage, uniformly stirring, and putting into a reaction kettle; heating the reaction kettle to 45-50 ℃; starting the reaction kettle, and completely dissolving the reagent at the stirring speed of 400-500r/min until the reagent is uniformly stirred to obtain the low interfacial tension foam oil displacement agent.
The betaine compound is prepared by compounding three betaine surfactants with similar structures, namely dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C, according to a proportion, and the foam performance and the interfacial activity of a system obtained after compounding are superior to those of an oil displacement agent system obtained from any single betaine.
The following formulation tests were carried out for the three betaines, and the test results are shown in Table 1.
Foaming capacity test of the oil displacement agent system obtained with betaine alone: a waring stirrer is adopted, the rotating speed is 6000rpm, the vigorous stirring is carried out for 60 seconds, the testing conditions are room temperature, the mineralization degrees are 3000mg/L, 5000mg/L and 8000mg/L, the solution amount is 100mL, and the mass concentration of the tested oil-displacing agent is 0.5 percent respectively.
And (3) testing the interfacial activity of the oil displacement agent system obtained by using single betaine: and (3) measuring the oil-water interfacial tension performance of the low-tension foam flooding system by using a TX-500C type spinning drop interfacial tension meter, wherein the oil-water interfacial tension value changes along with time, the measuring time of each sample is 2h, and recording the balance interfacial tension value. And selecting 65 ℃ according to the oil-water formation temperature and the testing temperature of the interfacial tension of the system. The mass concentration is 0.5%.
TABLE 1
The data in table 1 illustrate that the foam properties of the three betaines are ranked in order of dodecylamidopropyl hydroxypropyl sulfobetaine, tetradecylamiamidopropyl hydroxypropyl sulfobetaine, hexadecylamidopropyl hydroxypropyl sulfobetaine. The three betaines have the interfacial activity sequence of hexadecylamidopropyl hydroxypropyl sulfobetaine, tetradecylamiamidopropyl hydroxypropyl sulfobetaine and dodecyl amidopropyl hydroxypropyl sulfobetaine.
The foaming capacity and the interfacial activity test condition and the method of the betaine compound can refer to the foaming capacity and the interfacial activity test condition of the single betaine, the mass concentration of the test solution of the betaine compound is 0.5 percent, and the specific process is as follows:
dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C are compounded according to different mass ratios, then 100mL of solutions with the mass concentration of 0.5% are prepared by respectively using 5000mg/L of mineralized water, foaming capacity and interface activity are respectively tested, and the test results are shown in Table 2.
TABLE 2
According to the table 2, the preferable mass ratio of the low interfacial tension foam oil displacement agent composed of the above-mentioned compound is that the ratio of A: B: C is 2:3:1, namely the mass ratio of A: B: C is 25: 37.5: 12.5.
Comparative experiment 1:
replacement comparison experiments are respectively carried out on dodecyl dimethyl betaine D, tetradecyl dimethyl betaine E and hexadecyl dimethyl betaine F, the dodecyl amide propyl hydroxypropyl sulfobetaine A, the tetradecyl amide propyl hydroxypropyl sulfobetaine B and the hexadecyl amide propyl hydroxypropyl sulfobetaine C, the A: B: C: 2:3:1 mass ratio is referred for carrying out compounding, 100mL of solutions with the mass concentration of 0.5% are respectively prepared by using 5000mg/L of mineralized water, foaming capacity and interface activity tests are respectively carried out, and the test results are shown in Table 3.
TABLE 3
| Reagent | D:B:C | A:E:C | A:B:F |
| Ratio of | 2:3:1 | 2:3:1 | 2:3:1 |
| Foam volume (ml) | 580 | 670 | 620 |
| Equilibrium interfacial tension (10)-2mN/m) | 29.258 | 57.414 | 32.367 |
According to Table 3, the foaming performance of the system can be greatly improved by dodecyl dimethyl betaine D, tetradecyl dimethyl betaine E and hexadecyl dimethyl betaine F, but the interfacial activity of the system is greatly reduced.
Comparative experiment 2:
α -olefin sodium sulfonate and sodium dodecyl polyoxyethylene ether sulfate are adopted to carry out a replacement comparison experiment, a compound system is carried out according to the mass ratio of A: B: C-2: 3:1, then 100mL of solution with the mass concentration of 0.5% is prepared by respectively using 5000mg/L of mineralized water, and foaming capacity and interface activity tests are respectively carried out, and the test results are shown in Table 4.
TABLE 4
| Reagent | α sodium olefin sulfonate | Sodium dodecyl polyoxyethylene ether sulfate |
| Foam volume (ml) | 615 | 550 |
| Equilibrium interfacial tension (10)-2mN/m) | 30.154 | 1.848 |
According to Table 4, the α -alkene sodium sulfonate can greatly improve the foaming performance of the system compared with sodium dodecyl polyoxyethylene ether sulfate, but the interfacial activity of the system is greatly reduced.
Comparative experiment 3:
a comparative experiment is carried out by adopting a sulfonate fluorocarbon surfactant FC-15 and an amphoteric perfluoroalkyl ether betaine surfactant F-1012, a compound system is carried out according to the mass ratio of A to B to C of 2 to 3 to 1, 100mL of solution with the mass concentration of 0.5% is prepared by respectively using 5000mg/L of mineralized water, and foaming capacity and interfacial activity tests are respectively carried out, wherein the test results are shown in Table 5.
TABLE 5
| Reagent | FC-15 | F-1012 |
| Foam volume (ml) | 355 | 550 |
| Equilibrium interfacial tension (10)-2mN/m) | 53.259 | 1.848 |
According to the table 5, compared with the amphoteric perfluoroalkyl ether betaine surfactant F-1012, the sulfonate type fluorocarbon surfactant FC-15 reduces the foaming performance of the system, and the interfacial activity of the system is greatly reduced.
As can be seen from the above comparative experiments 1 to 3: example 1 Synthesis of dodecylamidopropyl hydroxypropyl sulfobetaine A, tetradecylamiamidopropyl hydroxypropyl sulfobetaine B, hexadecylamidopropyl hydroxypropyl sulfobetaineThe low-interfacial-tension foam oil displacement agent prepared from the betaine compound prepared from the alkali C in a mass ratio of 2:3:1, dodecyl hydroxypropyl phosphate betaine, sodium dodecyl polyoxyethylene ether sulfate, a fluorocarbon surfactant and water in proportion has good interfacial activity and high foam performance, and can reduce the oil-water interfacial tension value to 10-2mN/m level.
Example 2
The embodiment provides a low interfacial tension foam oil displacement agent, which comprises the following components in percentage by weight: 30% of betaine compound, 5% of dodecyl hydroxypropyl phosphate betaine, 10% of sodium dodecyl polyoxyethylene ether sulfate, 10% of fluorocarbon surfactant and 45% of water.
Wherein the fluorocarbon surfactant is amphoteric perfluoroalkyl ether betaine surfactant, namely product F-1012 provided by Shanghai Ying Zhengzhi Co., Ltd; the betaine compound is prepared by compounding dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C according to the mass ratio of A to B to C to 2 to 3 to 1.
The low interfacial tension foam oil displacement agent of the present example was prepared by the following steps:
preparing a betaine compound from dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C according to the mass ratio of A: B: C: 2:3: 1;
adding 30% of betaine compound, 5% of dodecyl hydroxypropyl phosphate betaine, 10% of dodecyl polyoxyethylene ether sodium sulfate, 10% of fluorocarbon surfactant and 45% of water into a beaker according to the weight percentage, uniformly stirring, and putting into a reaction kettle; heating the reaction kettle to 45-50 ℃; starting the reaction kettle, and completely dissolving the reagent at the stirring speed of 400-500r/min until the reagent is uniformly stirred to obtain the low interfacial tension foam oil displacement agent.
Example 3
The embodiment provides a low interfacial tension foam oil displacement agent, which comprises the following components in percentage by weight: 40% of betaine compound, 5% of dodecyl hydroxypropyl phosphate betaine, 20% of sodium dodecyl polyoxyethylene ether sulfate, 13% of fluorocarbon surfactant and 22% of water.
Wherein the fluorocarbon surfactant is amphoteric perfluoroalkyl ether betaine surfactant, namely product F-1012 provided by Shanghai Ying science and technology Limited. The betaine compound is prepared from dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C in a mass ratio of A to B to C to 2 to 3 to 1.
The low interfacial tension foam oil displacement agent of the present example was prepared by the following steps:
preparing a betaine compound from dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C according to the mass ratio of A: B: C: 2:3: 1.
Adding 40% of betaine compound, 5% of dodecyl hydroxypropyl phosphate betaine, 20% of dodecyl polyoxyethylene ether sodium sulfate, 13% of fluorocarbon surfactant and 22% of water into a beaker according to the weight percentage, uniformly stirring, and putting into a reaction kettle; heating the reaction kettle to 45-50 ℃; starting the reaction kettle, and completely dissolving the reagent at the stirring speed of 400-500r/min until the reagent is uniformly stirred to obtain the low interfacial tension foam oil displacement agent.
Example 4
The embodiment provides a low interfacial tension foam oil displacement agent, which comprises the following components in percentage by weight: 50% of betaine compound, 5% of dodecyl hydroxypropyl phosphate betaine, 20% of sodium dodecyl polyoxyethylene ether sulfate, 10% of fluorocarbon surfactant and 15% of water.
Wherein the fluorocarbon surfactant is amphoteric perfluoroalkyl ether betaine surfactant, namely product F-1012 provided by Shanghai Ying science and technology Limited. The betaine compound is prepared from dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C in a mass ratio of A to B to C to 2 to 3 to 1.
The low interfacial tension foam oil displacement agent of the present example was prepared by the following steps:
preparing a betaine compound from dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C according to the mass ratio of A: B: C: 2:3: 1.
Adding 50% of betaine compound, 5% of dodecyl hydroxypropyl phosphate betaine, 20% of dodecyl polyoxyethylene ether sodium sulfate, 10% of fluorocarbon surfactant and 15% of water into a beaker according to the weight percentage, uniformly stirring, and putting into a reaction kettle; heating the reaction kettle to 45-50 ℃; starting the reaction kettle, and completely dissolving the reagent at the stirring speed of 400-500r/min until the reagent is uniformly stirred to obtain the low interfacial tension foam oil displacement agent.
Example 5
The embodiment provides a low interfacial tension foam oil displacement agent, which comprises the following components in percentage by weight: 50% of betaine compound, 5% of dodecyl hydroxypropyl phosphate betaine, 10% of sodium dodecyl polyoxyethylene ether sulfate, 13% of fluorocarbon surfactant and 22% of water.
Wherein the fluorocarbon surfactant is amphoteric perfluoroalkyl ether betaine surfactant, namely product F-1012 provided by Shanghai Ying science and technology Limited. The betaine compound is prepared from dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C in a mass ratio of A to B to C to 2 to 3 to 1.
The low interfacial tension foam oil displacement agent of the present example was prepared by the following steps:
preparing a betaine compound from dodecyl amide propyl hydroxypropyl sulfobetaine A, tetradecyl amide propyl hydroxypropyl sulfobetaine B and hexadecyl amide propyl hydroxypropyl sulfobetaine C according to the mass ratio of A: B: C: 2:3: 1.
Adding 50% of betaine compound, 5% of dodecyl hydroxypropyl phosphate betaine, 10% of dodecyl polyoxyethylene ether sodium sulfate, 13% of fluorocarbon surfactant and 22% of water into a beaker according to the weight percentage, uniformly stirring, and putting into a reaction kettle; heating the reaction kettle to 45-50 ℃; starting the reaction kettle, and completely dissolving the reagent at the stirring speed of 400-500r/min until the reagent is uniformly stirred to obtain the low interfacial tension foam oil displacement agent.
Test example:
this test example simulated experiments were conducted on the low interfacial tension foam oil displacement agents prepared in examples 1-5 above.
Foaming ability test: a waring stirrer is adopted, the rotating speed is 6000rpm, the mixture is vigorously stirred for 60 seconds, the testing conditions are room temperature, the mineralization degree is 5000mg/L, the solution amount is 100mL, and the tested mass concentration is 0.5 percent respectively.
And (3) testing the interfacial activity: and (3) measuring the oil-water interfacial tension performance of the low-tension foam flooding system by using a TX-500C type spinning drop interfacial tension meter, wherein the oil-water interfacial tension value changes along with time, the measuring time of each sample is 2h, and recording the balance interfacial tension value. And selecting 65 ℃ according to the oil-water formation temperature and the testing temperature of the interfacial tension of the system. The mass concentration is 0.5%.
Simulating an oil displacement experiment: the displacement physical simulation test of the low interfacial tension foam oil displacement agent adopts a single-tube core displacement model, and the core is an artificial core with the average diameter of 2.5cm and the average length of 10 cm. The test water is Marxi formation water of a Hongkong oil field, and the test oil is compound simulated oil of Marxi crude oil and kerosene of the Hongkong oil field (crude oil: kerosene is 1: 4). The test temperature was 65 ℃ and the injection rate was 0.5 ml/min. The test procedure of this test example was: (1) the core was evacuated for 24 hours and saturated with simulated formation water and the pore volume and porosity of the core were determined. (2) And (4) simulating oil saturation core at 65 ℃, calculating the crude oil saturation degree, wherein the injection amount is 2.0 PV. (3) And (5) carrying out water flooding on the stratum until the water content is 98%, and calculating the water flooding recovery ratio. (4) Low tension foam flooding, injecting 0.5PV to 98% water content, and calculating recovery ratio. The test results are shown in table 6.
TABLE 6
As can be seen from the data in Table 6, the low interfacial tension foam oil displacement agent obtained in examples 1-5 has good interfacial activity and high foaming performance, the foaming height can reach more than 5 times of the volume of the initial solution, and the interfacial tension value can reach 10 lower-2The mN/m level improves the recovery ratio by more than 10 percent.
As can be seen from the test examples and the examples 1 to 5, the low interfacial tension foam oil displacement agent provided by the invention, which is composed of 30 to 50 wt% of betaine, 5 wt% of dodecyl hydroxypropyl phosphate betaine, 10 to 25 wt% of sodium dodecyl polyoxyethylene ether sulfate, 10 to 15 wt% of fluorocarbon surfactant and the balance of water, has good interfacial activity, high foaming performance and good oil displacement capability. The oil displacement agent with foaming property and interfacial activity has the characteristics of easily available raw materials, low cost, simple preparation process and the like, can reduce the oil-water interfacial tension and improve the oil displacement efficiency, can improve the sweep efficiency, achieves the aim of obviously improving the recovery ratio, and is suitable for being applied and popularized in oil fields.
Claims (8)
1. A low interfacial tension foam oil displacement agent is characterized in that: the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 30-50% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 10-25% of sodium dodecyl polyoxyethylene ether sulfate, 10-15% of fluorocarbon surfactant and the balance of water;
wherein the betaine is formed by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2 (1-3) to (1-3); the fluorocarbon surfactant comprises an amphoteric perfluoroalkyl ether betaine surfactant.
2. The low interfacial tension foam oil-displacing agent according to claim 1, characterized in that: the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 30-50% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 10-25% of sodium dodecyl polyoxyethylene ether sulfate, 10-15% of fluorocarbon surfactant and the balance of water;
wherein the betaine is prepared by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2:3: 1.
3. The low interfacial tension foam oil-displacing agent according to claim 1, characterized in that: the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 50% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 25% of sodium dodecyl polyoxyethylene ether sulfate, 15% of amphoteric perfluoroalkyl ether betaine surfactant and the balance of water;
wherein the betaine is prepared by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2:3: 1.
4. The low interfacial tension foam oil-displacing agent according to claim 1, characterized in that: the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 30% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 10% of sodium dodecyl polyoxyethylene ether sulfate, 10% of amphoteric perfluoroalkyl ether betaine surfactant and the balance of water;
wherein the betaine is prepared by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2:3: 1.
5. The low interfacial tension foam oil-displacing agent according to claim 1, characterized in that: the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 40% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 20% of sodium dodecyl polyoxyethylene ether sulfate, 13% of amphoteric perfluoroalkyl ether betaine surfactant and the balance of water;
wherein the betaine is prepared by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2:3: 1.
6. The low interfacial tension foam oil-displacing agent according to claim 1, characterized in that: the low interfacial tension foam oil displacement agent comprises the following components in percentage by mass: 50% of betaine, 5% of dodecyl hydroxypropyl phosphate betaine, 20% of sodium dodecyl polyoxyethylene ether sulfate, 10% of amphoteric perfluoroalkyl ether betaine surfactant and the balance of water;
wherein the betaine is prepared by mixing dodecyl amide propyl hydroxypropyl sulfobetaine, tetradecyl amide propyl hydroxypropyl sulfobetaine and hexadecyl amide propyl hydroxypropyl sulfobetaine according to the mass ratio of 2:3: 1.
7. A process for preparing the low interfacial tension foam oil-displacing agent of any one of claims 1 to 6, comprising the steps of:
betaine, dodecyl hydroxypropyl phosphate betaine, dodecyl polyoxyethylene ether sodium sulfate, fluorocarbon surfactant and water are sequentially added into a reaction kettle at 45-50 ℃, and then the residual amount of water is gradually added under the stirring speed of 400-plus-material 500r/min to completely dissolve the reagent until the mixture is uniformly stirred to obtain the low-interfacial tension foam oil displacement agent.
8. The use of the low interfacial tension foam oil displacement agent according to any one of claims 1 to 6 in the field of crude oil recovery, characterized in that: the mass concentration of the low interfacial tension foam oil displacement agent in the water solution is 0.5-1.0%.
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| CN109777393B (en) * | 2019-03-19 | 2020-04-14 | 中国石油化工股份有限公司 | Foam oil displacement agent |
| CN114540002B (en) * | 2020-11-24 | 2023-04-25 | 中国石油天然气股份有限公司 | Salt-resistant low-interfacial tension foam oil displacement agent |
| CN112812761A (en) * | 2021-01-15 | 2021-05-18 | 四川省威沃敦化工有限公司 | Foaming agent with high temperature resistance, high salt content and high condensate oil content as well as preparation method and application thereof |
| CN115434676A (en) * | 2021-06-01 | 2022-12-06 | 中国石油天然气股份有限公司 | Foam discharging agent for gas recovery of foam drainage of gas well and use method thereof |
| CN113667465A (en) * | 2021-08-04 | 2021-11-19 | 中国石油天然气股份有限公司 | Surfactant for improving recovery ratio based on static emulsification and preparation method thereof |
| CN113943564B (en) * | 2021-10-26 | 2023-03-17 | 扬州润达油田化学剂有限公司 | Compound ultra-low interfacial tension surfactant and preparation method thereof |
| CN113929535A (en) * | 2021-12-02 | 2022-01-14 | 安徽富瑞雪化工科技股份有限公司 | Environment-friendly anti-blocking agent for compound fertilizer and preparation method thereof |
| CN116265564A (en) * | 2021-12-17 | 2023-06-20 | 中国石油天然气股份有限公司 | Foam system for clastic rock oil reservoir and preparation method thereof |
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