CN115785438A - Anionic and nonionic emulsified oil displacement agent and preparation method and application thereof - Google Patents
Anionic and nonionic emulsified oil displacement agent and preparation method and application thereof Download PDFInfo
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Abstract
A non-ionic anionic emulsified oil displacement agent and a preparation method and application thereof, wherein the preparation method comprises the following steps: firstly, fatty alcohol-polyoxyethylene ether is used as a raw material, and hydroxyl groups on a molecular chain of the fatty alcohol-polyoxyethylene ether are activated by using a polar solvent, wherein the length of a straight-chain alkane part of the fatty alcohol-polyoxyethylene ether is 8-18, and the number of segments of a polyoxyethylene ether chain part is 5-20; then, na in the alkaline nano-source substance is used for replacing H in molecular chain hydroxyl of fatty alcohol-polyoxyethylene ether to form sodium alkoxide; and finally, carrying out nucleophilic substitution reaction on the fatty alcohol-polyoxyethylene ether by using 3-chlorine-2-hydroxypropyl sodium alkylsulfonate to prepare the anionic and nonionic emulsified oil displacement agent. The anionic and nonionic emulsified oil displacement agent prepared by the invention has the advantages of lower adsorption loss, stronger pore medium emulsifying capacity and smaller particle size of formed emulsion, thereby improving the recovery efficiency, being capable of being well used for improving the recovery efficiency of crude oil and having good application prospect on crude oil exploitation.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to a non-ionic anionic emulsified oil displacement agent and a preparation method and application thereof.
Background
Although new energy has been widely studied and focused in recent years, petroleum has always occupied the most important position among various energy sources in the world. Due to the heterogeneity of reservoirs and the difference in the mobility of crude oil and water, a large amount of crude oil still remains in the pores of the formation after development by waterflooding. The recovery efficiency is improved mainly by improving the property of the oil displacement agent and changing the flow state of the crude oil. Therefore, it is necessary to research an oil displacement agent with excellent performance, expand swept volume, and improve crude oil recovery and oilfield development benefit.
The emulsified oil displacement agent is mainly divided into a surfactant, a polymer surfactant, active nano particles and the like. Wherein the surfactant emulsified oil displacement agent is widely applied to oil fields due to the low cost. However, the emulsification of crude oil by conventional surfactant-type emulsified oil-displacing agents has mainly the following three drawbacks.
Firstly, the O/W emulsion formed by emulsifying crude oil by the conventional emulsification oil displacement agent has larger particle size, and larger emulsion droplets cause poorer flowing capability in a pore medium. Secondly, the conventional emulsified oil displacement agent has large adsorption loss in the stratum, so that a good emulsified oil displacement effect can be achieved in a near-wellbore area. Finally, because oil is hidden in the water drive development process, a more serious emulsification phenomenon can occur on two sides of a water flow channel to form W/O emulsion with poorer flowing capability, while the W/O emulsion emulsified by the conventional emulsification oil displacement agent has poorer capability, the particle size of the W/O/W emulsion formed by emulsification is larger, and the particle size of the W/O/W emulsion formed after emulsification can be obviously increased along with the increase of the water content in the W/O emulsion, so that the flowing capability of the W/O/W emulsion in a pore medium is further reduced.
Therefore, the need of finding or developing an emulsified oil displacement agent which can emulsify crude oil into small droplets and efficiently emulsify W/O emulsion is needed to provide a new idea for upgrading and enhancing the efficiency of oil field development.
Disclosure of Invention
Based on the above, the invention provides a non-ionic anionic emulsified oil-displacing agent and a preparation method and application thereof, and aims to solve the problems that an emulsion formed when the existing emulsified oil-displacing agent is used for emulsifying crude oil is large in particle size, large in stratum adsorption loss and poor in W/O emulsion emulsifying capacity.
In order to achieve the above object, the present invention provides a anionic and nonionic type emulsified oil-displacing agent having a structural formula of the following formula (1):
wherein n is an integer from 8 to 18; m is an integer from 5 to 20.
In a more preferred embodiment of the present invention, in the structural formula of formula (1), n is an integer of 10 to 12, and m is an integer of 8 to 15.
According to another aspect of the invention, the invention also provides a preparation method of the anionic and nonionic emulsified oil displacement agent, which comprises the following steps:
firstly, fatty alcohol-polyoxyethylene ether is used as a raw material, and a polar solvent is used for activating hydroxyl groups on a molecular chain of the fatty alcohol-polyoxyethylene ether, wherein the length of a straight-chain alkane part of the fatty alcohol-polyoxyethylene ether is 8-18, and the number of segments of a polyoxyethylene ether chain part is 5-20;
then, na in the alkaline sodium source substance is used for replacing H in molecular chain hydroxyl of the fatty alcohol-polyoxyethylene ether to form sodium alkoxide;
and finally, carrying out nucleophilic substitution reaction on the fatty alcohol-polyoxyethylene ether by using 3-chloro-2-hydroxypropyl sodium alkylsulfonate to prepare the anionic and nonionic emulsified oil displacement agent.
As a further preferable technical scheme of the invention, the preparation method specifically comprises the following steps:
step 1: adding a polar solvent into a reaction container at room temperature, connecting a reflux condensing device, introducing nitrogen, and stirring for 30-60 min at the water bath temperature of 25-30 ℃ at the stirring speed of 250-1000 r/min;
step 2: adding fatty alcohol-polyoxyethylene ether into the reaction container in the step 1, heating the water bath temperature to 50-65 ℃, reacting for 30-60 min, and stirring at the speed of 250-1000 r/min;
and 3, step 3: adding an alkaline nano source substance into the reaction container in the step 2, and reacting for 2-4 hours;
and 4, step 4: dissolving 3-chloro-2-hydroxypropyl sodium alkyl sulfonate in deionized water at room temperature to obtain a water phase;
and 5: adding the water phase prepared in the step (4) into the reaction vessel in the step (3), heating the water bath to 65-85 ℃, stirring at the speed of 250-1000 r/min, and reacting for 8-12 hours;
and 6: cooling the reaction product obtained in the step 5 to room temperature, and removing redundant reaction solvent by using a rotary evaporator to obtain a negative non-ionic emulsified oil displacement agent crude product;
and 7: and (4) washing and filtering the crude product of the anionic and nonionic type emulsified oil-displacing agent obtained in the step (6) for multiple times by using absolute ethyl alcohol to obtain the purified anionic and nonionic type emulsified oil-displacing agent.
As a further preferable technical scheme of the invention, the molar ratio of the fatty alcohol-polyoxyethylene ether, the alkaline sodium source substance and the 3-chloro-2-hydroxypropyl alkyl sodium sulfonate is (1-1.3): (1-1.5): (1-1.5).
As a further preferable technical scheme of the invention, the polar solvent is n-hexanol or n-heptane.
In a further preferred embodiment of the present invention, the alkaline sodium source is sodium methoxide or sodium hydroxide.
As a further preferable technical scheme of the invention, the mass fraction of the 3-chloro-2-hydroxypropyl alkyl sodium sulfonate in the water phase is 20-40%.
According to another aspect of the invention, the invention also provides the anionic and nonionic emulsified oil-displacing agent or the anionic and nonionic emulsified oil-displacing agent prepared by the preparation method of the anionic and nonionic emulsified oil-displacing agent, which is applied to crude oil exploitation.
The anionic and nonionic emulsified oil displacement agent and the preparation method and the application thereof can achieve the following beneficial effects by adopting the technical scheme:
according to the structure of the anionic and nonionic type emulsified oil displacement agent provided by the invention, the anionic and nonionic type emulsified oil displacement agent can be quickly dissolved in water through the action of hydrogen bonds on a molecular chain, and has a good crude oil permeation effect due to a certain carbon chain length and ether bonding force, so that molecules of the anionic and nonionic type emulsified oil displacement agent can act on an oil-water interface film in a W/O emulsion, the purpose of efficiently emulsifying the W/O emulsion is achieved, the molecules of the anionic and nonionic type emulsified oil displacement agent can be spontaneously enriched on an oil-water interface, and the occupied area of a single molecule is small, so that the anionic and nonionic type emulsified oil displacement agent has a good effect of reducing the tension of the oil-water interface. The preparation method is simple and efficient, and the materials are easy to obtain.
Compared with the traditional emulsified oil-displacing agent, the anionic and nonionic emulsified oil-displacing agent prepared by the invention has the advantages of lower adsorption loss, stronger pore medium emulsifying capacity and smaller particle size of the formed emulsion, so that the recovery efficiency is improved, the anionic and nonionic emulsified oil-displacing agent can be well used for improving the recovery efficiency of crude oil, and has good application prospect in crude oil exploitation.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 shows the demulsification of crude oil W/O emulsion by anionic and nonionic emulsified oil-displacing agents with different structural formulas.
FIG. 2 is a water-soluble state of the anionic and nonionic type emulsified oil-displacing agent of example 1;
FIG. 3 is an infrared spectroscopic analysis of the anionic and nonionic type emulsified oil-displacing agent of example 1;
FIG. 4 shows the oil-water interfacial tension of the anionic and nonionic emulsified oil-displacing agent solutions of example 1 with different mineralized water configurations;
FIG. 5 is a diagram showing the demulsification of the crude oil W/O emulsion by the anionic and nonionic type emulsified oil-displacing agent of example 1;
FIG. 6 is a pore medium emulsifying capacity test of the anionic nonionic type emulsified oil-displacing agent crude oil of example 1.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The invention provides a negative nonionic type emulsified oil displacement agent, which has a structural formula shown as the following formula (1):
wherein n is an integer from 8 to 18; m is an integer from 5 to 20.
Preferably, in the structural formula of formula (1), n is an integer of 10 to 12, and m is an integer of 8 to 15.
The invention also provides a preparation method of the anionic and nonionic emulsified oil displacement agent, which adopts a nucleophilic substitution preparation mode and comprises the following steps:
firstly, fatty alcohol-polyoxyethylene ether is used as a raw material, and a polar solvent is used for activating hydroxyl groups on a molecular chain of the fatty alcohol-polyoxyethylene ether, wherein the length of a straight-chain alkane part of the fatty alcohol-polyoxyethylene ether is 8-18, and the number of segments of a polyoxyethylene ether chain part is 5-20;
then, na in the alkaline sodium source substance is used for replacing H in molecular chain hydroxyl of the fatty alcohol-polyoxyethylene ether to form sodium alkoxide;
and finally, carrying out nucleophilic substitution reaction on the fatty alcohol-polyoxyethylene ether by using 3-chlorine-2-hydroxypropyl sodium alkylsulfonate to prepare the anionic and nonionic emulsified oil displacement agent.
In the above step, the molar ratio of the fatty alcohol-polyoxyethylene ether, the alkaline sodium source substance and the 3-chloro-2-hydroxypropyl alkyl sodium sulfonate is (1-1.3): (1-1.5): (1-1.5).
In order that those skilled in the art will better understand and realize the technical solutions of the present invention, the present invention will be further described in detail by the following specific embodiments.
Example 1 preparation of anionic nonionic type emulsified oil-displacing agent
Step 1: at room temperature, a reflux condenser is connected to a 500mL three-neck flask containing 150mL of isopropanol solvent, nitrogen is introduced for 30min, then the temperature of a water bath is adjusted to 28 ℃, and the mixture is stirred for 30min at the speed of 500 r/min.
Step 2: adding 0.02mol of fatty alcohol-polyoxyethylene ether (the length of the straight-chain alkane part is 12, and the number of segments of the polyoxyethylene ether chain part is 12) into the three-neck flask filled with the polar solvent in the step 1, heating the water bath temperature to 60 ℃, and stirring and reacting at 500r/min for 30 minutes.
And 3, step 3: slowly adding 0.022mol of sodium methoxide into the three-neck flask in the step 2, and stirring and reacting at the water bath temperature of 60 ℃ and 450r/min for 3 hours;
and 4, step 4: dissolving 0.022mol of 3-chloro-2-hydroxypropyl sodium alkane sulfonate in 15ml of deionized water at room temperature to obtain a water phase;
and 5: adding the water phase prepared in the step 4 into the three-neck flask in the step 3, raising the temperature of a water bath to 75 ℃, changing the stirring speed to 500r/min, and stirring for reaction for 10 hours;
step 6: cooling the reaction product obtained in the step 5 to room temperature, and removing redundant reaction solvent by using a rotary evaporator to obtain a negative non-ionic emulsified oil displacement agent crude product;
and 7: and (3) washing and filtering the crude product of the anionic and nonionic type emulsified oil-displacing agent obtained in the step (6) with absolute ethyl alcohol for 5 times to obtain a purified anionic and nonionic type emulsified oil-displacing agent with the structural formula shown as the formula (1), wherein m =12 and n =12 in the structural formula and is marked as a sample 1.
In order to further research the beneficial effects of the invention, according to the method of example 1, the following negative non-ionic emulsified oil displacement agents of samples 2-5 are respectively synthesized by selecting fatty alcohol-polyoxyethylene ethers with different structural formulas, and the difference from sample 1 lies in that the values of m and n are different, wherein: sample 2 was m =12,n =8; sample 3 was m =12,n =18; sample 4 was m =5,n =12; sample 5 was m =20,n =12.
Samples 1-5 were each tested as follows: deionized water is mixed with crude oil (a certain heavy oil reservoir of a Liaohe oil field, the viscosity is 943.5mPa & s at the temperature of 30 ℃) to prepare a crude oil W/O emulsion with the water content of 50%. Then, 1 to 5 (m =12, n =8, m =12, n =12, m =12, n =18, m =5, n =12, m =20, n = 12) of the anionic and nonionic type emulsified oil displacing agent prepared above was added to the crude oil W/O emulsion in an amount of 0.5%, and stirred at 400r/min for 3min. And finally placing the mixture into a reagent bottle, standing until oil and water are layered, recording the demulsification condition of the W/O emulsion, and obtaining a test result shown in figure 1. As can be seen from fig. 1, samples 1 to 5 all had good dewatering effect on W/O emulsion, indicating good demulsification effect on W/O emulsion, with sample 1 (n =12, m = 12) having the best dewatering effect on W/O emulsion.
The anionic and nonionic type emulsified oil-displacing agent in any embodiment of the invention or the anionic and nonionic type emulsified oil-displacing agent prepared by the preparation method of the anionic and nonionic type emulsified oil-displacing agent in any embodiment of the invention can be used in crude oil exploitation to improve the recovery ratio of crude oil.
To further investigate the beneficial effects of the present invention, the following tests were performed on the sample of example 1 as follows:
In this test, the commercially available fatty alcohol-polyoxyethylene ether (linear alkane moiety length 12, polyoxyethylene ether chain moiety number 12) was selected as the emulsified oil displacement agent for the test object of the comparative experiment.
Water solubility test: respectively taking the anionic and nonionic emulsified oil displacement agent (m =12, n = 12) prepared in the example 1 and fatty alcohol-polyoxyethylene ether as test objects, adding the test objects into deionized water, stirring at the rotating speed of 100r/min, and respectively observing the solubility of the anionic and nonionic emulsified oil displacement agent and the fatty alcohol-polyoxyethylene ether in an aqueous solution; the result of the same test conditions for the substituted anionic and nonionic emulsified oil displacement agent is shown in fig. 2. When the recovery ratio is improved by using the emulsified oil displacement agent in a mine field, a large amount of time and economic cost can be saved due to the rapid water solubility of the emulsified oil displacement agent, and therefore, the emulsified oil displacement agent needs to have good water solubility. As can be seen from FIG. 2, the water solubility of the fatty alcohol-polyoxyethylene ether is poor, and the fatty alcohol-polyoxyethylene ether still partially remains undissolved after being stirred for 1min at the rotating speed of 100 r/min. The anionic and nonionic emulsified oil displacement agent can be quickly dissolved in water without stirring after being added into the water, which is mainly caused by the introduction of ionic radical head sulfonic acid groups.
Infrared spectrum analysis: a small amount of the anionic and nonionic emulsified oil-displacing agent (m =12, n = 12) prepared in example 1 and fatty alcohol-polyoxyethylene ether were used as analysis objects, and FT-IR tests were performed respectively by a Vertex 80V infrared spectrometer (resolution 0.01cm-1, wave number range 4000-400 cm-1) to characterize the chemical structures, and infrared spectroscopic analysis is shown in FIG. 3. It can be seen that the anionic nonionic emulsified oil displacement agent and the fatty alcohol-polyoxyethylene ether are both 3365cm in length -1 、2920cm -1 、2856cm -1 And 1113cm -1 Where a peak appears. Wherein, 3356cm -1 The left and right are the stretching vibration peak of hydroxyl (-OH). The broad vibrational band indicates that both species are capable of forming hydrogen bonds in water, which is one of the reasons for their high interfacial activity; 2920cm -1 And 2856cm -1 Stretching vibration of methyl and methylene C-H on an alkyl chain is adopted; 1113cm -1 Is a symmetric stretching vibration peak of an ether bond (C-O-C). In addition, compared with fatty alcohol-polyoxyethylene ether, the anionic nonionic type emulsified oil displacement agent is 1203cm -1 And 621cm -1 In the presence of-SO 3 The absorption vibration peak of (1). The FT-IR experimental result analysis proves the successful synthesis of the anionic and nonionic emulsified oil displacement agent.
Respectively preparing mineralized water with the mineralization degree of 5000-200000 mg/L (NaCl), and stirring for 1 hour. The anionic and nonionic type emulsified oil-displacing agent (m =12, n = 12) prepared in example 1 was dissolved in mineralized water to prepare an anionic and nonionic type emulsified oil-displacing agent solution having a concentration of 0.5%.
At 30 ℃, a TX-500C interfacial tension meter (test range 10) -5 ～10 2 mN/m), and measuring the interfacial tension of a non-ionic emulsified oil displacement agent prepared from water with different mineralization degrees and dehydrated and degassed crude oil (a certain heavy oil reservoir of a Liaohe oil field, wherein the viscosity is 943.5mPa & s under the condition of 30 ℃) based on a rotary liquid drop method. The measurement time was 2 hours, and a stable interfacial tension value was obtained, and the test results are shown in FIG. 4. With the increase of NaCl concentration, the oil-water interfacial tension is firstly reduced and then increased. When the concentration of NaCl is about 60000mg/L, the oil-water interfacial tension can be reduced to an ultra-low interfacial tension level. The NaCl can compress the occupied area of the ionic group head on the molecules of the anionic and nonionic emulsified oil-displacing agent, so that the adsorption capacity of the anionic and nonionic emulsified oil-displacing agent on an oil-water interface is increased, and the tension of the oil-water interface is reduced. However, under the condition of high NaCl concentration, the solubility of the anionic and nonionic emulsified oil displacement agent in water is changed, and the capability of reducing the oil-water interfacial tension is weakened to a certain extent. However, when the NaCl content is 200000mg/L, the oil-water interfacial tension is still less than 0.1mN/m. The anionic and nonionic emulsified oil displacement agent has better salt tolerance.
Test 3, demulsification of anionic nonionic emulsified oil displacement agent on W/O emulsion
Deionized water and crude oil (a certain heavy oil reservoir in Liaohe oil field, the viscosity is 943.5 mPa.s under the condition of 30 ℃) are mixed to prepare a crude oil W/O emulsion with the water content of 10%, 20%, 30%, 40%, 50%, 60% and 70%. Then, the anionic and nonionic type emulsified oil-displacing agent (m =12, n = 12) prepared in example 1 was added to the above crude oil W/O emulsion in an amount of 0.5%, and stirred at 400r/min for 3min. Then placing the mixture into a reagent bottle, standing until the oil and the water are separated, and recording the demulsification condition of the W/O emulsion, wherein the result is shown in a figure 5. It can be seen that after the anionic nonionic type emulsified oil displacement agent is mixed with W/O emulsions with different water contents, water in the internal phase is emulsified to the external phase. The dehydration rate is increased along with the increase of the water content in the initial W/O emulsion, which shows that the anionic and nonionic emulsified oil displacement agent has good demulsification effect on the W/O emulsion.
Test 4, the emulsification capacity of the anionic nonionic type emulsification oil displacement agent to the pore medium of the crude oil
The anionic and nonionic type emulsified oil-displacing agent (m =12, n = 12) obtained in example 1 was dissolved in water to prepare an anionic and nonionic type emulsified oil-displacing agent solution having a concentration of 0.5%.
In addition, as a comparative experiment, another portion was prepared and commercially available Sodium Dodecyl Sulfate (SDS) was added.
And filling the sand filling pipe with the formation sand with the target permeability of about 1000mD when the sand filling pipe is adopted for simulation. Vacuumizing the sand filling pipe and then saturating formation water; injecting crude oil (a certain thick oil reservoir of the Liaohe oil field, the viscosity is 943.5mPa s at the temperature of 30 ℃) into the model at the speed of 0.2m/d, continuously injecting 1PV after oil is discharged from an outlet, stopping injection, and closing a valve; then closing valves at two ends of the sand filling pipe, and aging for 48 hours at the temperature of 30 ℃; injecting water or the emulsified oil displacement agent solution into a sand filling pipe at the speed of 0.5 mL/min; and stopping injecting when the water content of the produced liquid at the outlet is higher than 98%. The displacement pressure dynamics, production fluid status and micro-emulsion status at displacement to 1PV are shown in figure 6. It can be seen that since the simulated formation water has essentially no emulsifying capacity for the thick oil, the fingering is severe after injection and the pressure rises rapidly to a maximum and then falls rapidly, since its viscosity is much less than that of the thick oil. SDS has certain emulsifying capacity to the thick oil, under the shearing action of pore medium, the thick oil can be emulsified into O/W emulsion to be extracted, at this time, the grain size of O/W emulsion is larger (the average grain size is greater than 20 micrometers). The formed O/W has poor flowing capability in pore media, so the maximum value of displacement pressure is about 5 times of that of water flooding, and the construction difficulty of a mine field is greatly increased. Since SDS has a weak ability to emulsify thick oil, the pressure reaches a maximum value slowly. The pressure reached a maximum around 0.13PV for water flooding and 0.3PV for SDS solution flooding. The anionic and nonionic emulsified oil displacement agent has good emulsifying capacity, and the particle size of the formed O/W emulsion is small (the average particle size is about 7 mu m). Due to its strong emulsifying power and small emulsion particle size, the highest pressure during displacement is low and reaches a maximum value faster. Compared with SDS, the emulsion formed by the anionic and nonionic type emulsified oil displacement agent has small particle size and high oil displacement efficiency, so that the stable pressure is lower.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
Claims (9)
1. The anionic and nonionic emulsified oil-displacing agent is characterized by having a structural formula of the following formula (1):
wherein n is an integer from 8 to 18; m is an integer from 5 to 20.
2. The anionic and nonionic emulsified oil-displacing agent according to claim 1, wherein in the structural formula of formula (1), n is an integer of 10 to 12, and m is an integer of 8 to 15.
3. A method for preparing the anionic and nonionic type emulsified oil-displacing agent according to claim 1 or 2, which comprises the steps of:
firstly, fatty alcohol-polyoxyethylene ether is used as a raw material, and a polar solvent is used for activating hydroxyl groups on a molecular chain of the fatty alcohol-polyoxyethylene ether, wherein the length of a straight-chain alkane part of the fatty alcohol-polyoxyethylene ether is 8-18, and the number of segments of a polyoxyethylene ether chain part is 5-20;
then, na in the alkaline nano-source substance is used for replacing H in molecular chain hydroxyl of fatty alcohol-polyoxyethylene ether to form sodium alkoxide;
and finally, carrying out nucleophilic substitution reaction on the fatty alcohol-polyoxyethylene ether by using 3-chlorine-2-hydroxypropyl sodium alkylsulfonate to prepare the anionic and nonionic emulsified oil displacement agent.
4. The method for preparing the anionic and nonionic emulsified oil-displacing agent according to claim 3, wherein the method specifically comprises the following steps:
step 1: adding a polar solvent into a reaction container at room temperature, connecting a reflux condensing device, introducing nitrogen, and stirring for 30-60 min at the water bath temperature of 25-30 ℃ at the stirring speed of 250-1000 r/min;
step 2: adding fatty alcohol-polyoxyethylene ether into the reaction container in the step 1, heating the water bath temperature to 50-65 ℃, reacting for 30-60 min, and stirring at the speed of 250-1000 r/min;
and step 3: adding an alkaline nano source substance into the reaction container in the step 2, and reacting for 2-4 hours;
and 4, step 4: dissolving 3-chloro-2-hydroxypropyl sodium alkyl sulfonate in deionized water at room temperature to obtain a water phase;
and 5: adding the water phase prepared in the step (4) into the reaction vessel in the step (3), heating the water bath temperature to 65-85 ℃, stirring at the speed of 250-1000 r/min, and reacting for 8-12 hours;
and 6: cooling the reaction product obtained in the step 5 to room temperature, and removing redundant reaction solvent by using a rotary evaporator to obtain a non-ionic emulsified oil displacement agent crude product;
and 7: and (4) washing and filtering the crude product of the anionic and nonionic type emulsified oil-displacing agent obtained in the step (6) for multiple times by using absolute ethyl alcohol to obtain the purified anionic and nonionic type emulsified oil-displacing agent.
5. The preparation method of the anionic and nonionic emulsified oil-displacing agent according to claim 3 or 4, wherein the molar ratio of the fatty alcohol-polyoxyethylene ether, the alkaline sodium source substance and the sodium 3-chloro-2-hydroxypropyl sulfonate is (1-1.3): (1-1.5): (1-1.5).
6. The method for preparing anionic or nonionic emulsified oil-displacing agent according to claim 3 or 4, wherein the polar solvent is n-hexanol or n-heptane.
7. The method for preparing anionic or nonionic emulsified oil-displacing agent according to claim 3 or 4, wherein the alkaline sodium source is sodium methoxide or sodium hydroxide.
8. The preparation method of the anionic and nonionic emulsified oil-displacing agent according to claim 4, wherein the mass fraction of the sodium 3-chloro-2-hydroxypropylalkane sulfonate in the aqueous phase is 20-40%.
9. The anionic and nonionic emulsified oil-displacing agent as defined in claim 1 or 2 or the anionic and nonionic emulsified oil-displacing agent prepared by the method for preparing the anionic and nonionic emulsified oil-displacing agent as defined in any one of claims 3 to 8 is used in crude oil production.
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