Intelligent oil-water selective profile control agent and preparation method thereof

Abstract

The application discloses an intelligent oil-water selective profile control agent and a preparation method thereof, and relates to the field of oilfield chemical technology in the technical field of improving oil recovery, wherein components and mass percentage of the profile control agent are as follows: 0.3-1.0% of a main agent, 0.1-0.5% of a trigger regulator and 0-5.0% of a promoter, and the rest is water; wherein the main agent is a water-dispersible surfactant molecule, the trigger regulator is a water-soluble surfactant molecule, and the promoter is oil. The preparation method comprises the following steps: adding the trigger regulator into water, completely dissolving the trigger regulator, then adding the main agent to uniformly disperse the main agent, and subsequently adding the promoter to uniformly disperse the promoter, so as to obtain the intelligent oil-water selective profile control agent. The profile control agent can spontaneously adjust its viscosity according to water content in different parts of a formation during formation migration, shows high viscosity under the condition of high water content in a high-permeability layer, shows low viscosity under the condition of low water content in a low-permeability layer, thereby plugging the high-permeability water-bearing zone while not damaging the low-permeability oil-bearing zone, and realizes intelligent and selective plugging of the formation.

Description

Technical Field

[0001] This invention relates to the field of oilfield chemistry technology in enhanced oil recovery technology, and particularly to a smart oil-water selective modifier and its preparation method. Background Technology

[0002] Water channeling is a prominent problem in the later stages of water injection development in oilfields, resulting in ineffective water circulation and poor economic returns for crude oil extraction. Water channeling control is an effective way to address this issue. Commonly used control agents include polymer gels, polymer microspheres, and pre-crosslinked expanded particles. These agents can block water channeling in high-permeability zones through crosslinking reactions and water absorption expansion, thereby improving water channeling and increasing oil recovery. However, water channeling control requires selective blocking capabilities from these agents, ensuring they block high-permeability aquifers without blocking low-permeability oil-bearing layers, thus preventing reservoir damage. Although these agents swell upon contact with water and shrink upon contact with oil, achieving oil plugging rates greater than 35%, their selective blocking capabilities are still insufficient for field operations. This can lead to the blockage of low-permeability reservoirs near the wellbore, causing reservoir damage.

[0003] To improve the selective plugging performance of modulators, oil-soluble solid particles are usually added to their composition. Chinese patent CN201710652455.5 discloses a polymer modulator with selective water-blocking function. This polymer is composed of acrylamide, sulfonic acid monomers, and an oil-soluble resin emulsion polymerized, exhibiting excellent selective water-blocking without oil-blocking effects, and possessing a high scour resistance ratio. Chinese patent CN201510520553.4 discloses a selective plugging agent made from oil residue or oily sludge and its preparation method. By weight percentage, the raw materials for preparing the selective water-blocking agent include the following components: 20%-40% oil residue or oily sludge, 5%-20% asphalt, and 0.2%-1% zwitterionic surfactant. The blocker comprises 0.5%-2% superdispersant, 1%-10% solid particles, and the balance water. This blocker has strong selective water-blocking ability, does not damage the oil layer, does not pollute the formation, and is suitable for a wide range of oil reservoir types. Chinese Patent CN201410038176.6 describes an emulsified asphalt selective water-blocking agent and its preparation method. By weight percentage, the water-blocking agent has the following components: benzoic acid 3-6%, sorbitan monooleate 0.5-2.0%, isopropanol 6-10%, asphalt 10-40%, tallow propylene diamine 0.1-1.0%, polyacrylamide 0.1-0.3%, and the balance water. This invention has good selective water-blocking effect.

[0004] All of the aforementioned patents incorporate oil-soluble solid particles into the modulator. While these particles can improve the selective plugging performance of the modulator to some extent, the complex distribution of oil and water in the formation means that the oil-soluble solid particles cannot spontaneously adjust their plugging performance to achieve selective plugging based on the oil-water distribution in different parts of the formation. Therefore, developing novel selective modulators is one of the key issues that urgently needs to be addressed to improve the recovery rate of high water-cut old oilfields. Summary of the Invention

[0005] The purpose of this invention is to provide a smart oil-water selective flood control agent and its preparation method. This agent can spontaneously adjust its plugging performance according to the water cut of different parts of the formation, plugging high-permeability water-bearing zones without damaging low-permeability oil-bearing zones. To achieve the above objective, this invention provides the following technical solution:

[0006] On one hand, the present invention provides an intelligent oil-water selective displacement modifier, wherein the components and mass percentage content of the displacement modifier are as follows:

[0007] The main component consists of 0.3%–1.0%, a triggering regulator of 0.1%–0.5%, and an accelerator of 0–5.0%, with the remainder being water.

[0008] The main agent is a water-dispersible surfactant molecule, the triggering regulator is a water-soluble surfactant molecule, and the accelerator is an oil.

[0009] Furthermore, the water-dispersible surfactant molecule has the following structure:

[0010]

[0011] R1 and R2 are both alkyl aliphatic chains with a length of 12 to 18.

[0012] Furthermore, the water-soluble surfactant molecule is one or more of α-olefin sulfonate, fatty alcohol polyoxyethylene ether, and Tween.

[0013] Furthermore, the oil is one or more of diesel, kerosene, and light crude oil.

[0014] On the one hand, the present invention also provides a method for preparing a smart oil-water selective displacement agent, the preparation method comprising:

[0015] The triggering regulator is added to water and completely dissolved. Then the main agent is added and dispersed evenly. Subsequently, the accelerator is added and dispersed evenly to obtain the intelligent oil-water selective driving agent.

[0016] Furthermore, the synthesis method of the main agent is as follows:

[0017] S1: Dissolve fatty hydroxyethyl imidazoline in dichloromethane, add triethylamine, then add p-toluenesulfonyl chloride dropwise in an ice bath. After the addition is complete, react at room temperature for 24 h, wash with water until neutral, extract the organic phase by oil-water separation, and rotary evaporate at 40 °C to obtain water-dispersible surfactant intermediate one.

[0018] S2: Dissolve the first water-dispersible surfactant intermediate in excess ammonia water, then stir at room temperature for 48 hours, extract the organic phase by oil-water separation, and obtain the second water-dispersible surfactant intermediate by rotary evaporation at 40°C.

[0019] S3: Dissolve the water-dispersible surfactant intermediate product 2 in dichloromethane, add triethylamine, and then add bromoalkanes dropwise in an ice bath. After the addition is complete, heat to 50°C and react for 24 hours. Wash with water until neutral, extract the organic phase by oil-water separation, and obtain the main agent by rotary evaporation at 40°C.

[0020] Furthermore, the molar ratio of the aliphatic hydroxyethyl imidazoline, triethylamine, and p-toluenesulfonyl chloride is 1:3:1.5.

[0021] Furthermore, the molar ratio of the water-dispersible surfactant intermediates di- and triethylamine to bromoalkane is 1:3:1.1.

[0022] Furthermore, the aliphatic hydroxyethyl imidazoline is one of dodecyl hydroxyethyl imidazoline, tetradecyl hydroxyethyl imidazoline, hexadecyl hydroxyethyl imidazoline, or octadecyl hydroxyethyl imidazoline.

[0023] Furthermore, the bromoalkane is one of bromododecane, bromotetradecane, bromohexadecane, or bromooctadecane.

[0024] The technical effects and advantages of this invention are as follows:

[0025] This modulator can spontaneously adjust its viscosity according to the water content of different parts of the formation during the migration process. It exhibits high viscosity under high water content conditions in high-permeability layers and low viscosity under low water content conditions in low-permeability layers. Thus, it can block high-permeability water-bearing zones without damaging low-permeability oil-bearing zones, achieving intelligent selective blocking of formations.

[0026] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0027] Figure 1 This is a graph showing the relationship between the total water content and the viscosity of the mixture in the regulation system of the intelligent oil-water selective modifier of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] To address the shortcomings of existing technologies, this invention discloses an intelligent oil-water selective displacement modifier, wherein the components and mass percentages of the displacement modifier are as follows:

[0030] The main component consists of 0.3%–1.0%, a triggering regulator of 0.1%–0.5%, and an accelerator of 0–5.0%, with the remainder being water.

[0031] The main agent is a water-dispersible surfactant molecule, the triggering regulator is a water-soluble surfactant molecule, and the accelerator is an oil.

[0032] Preferably, the water-dispersible surfactant molecule has the following structure:

[0033]

[0034] R1 and R2 are both alkyl aliphatic chains with a length of 12 to 18.

[0035] Preferably, the water-soluble surfactant molecule is one or more of α-olefin sulfonate, fatty alcohol polyoxyethylene ether, and Tween.

[0036] Preferably, the oil is one or more of diesel, kerosene, and light crude oil.

[0037] On the other hand, this invention discloses a method for preparing a smart oil-water selective displacement agent, the preparation method comprising:

[0038] The triggering regulator is added to water and completely dissolved. Then the main agent is added and dispersed evenly. Subsequently, the accelerator is added and dispersed evenly to obtain the intelligent oil-water selective driving agent.

[0039] Preferably, the synthesis method of the main agent is as follows:

[0040] S1: Dissolve fatty hydroxyethyl imidazoline in dichloromethane, add triethylamine, then add p-toluenesulfonyl chloride dropwise in an ice bath. After the addition is complete, react at room temperature for 24 h, wash with water until neutral, extract the organic phase by oil-water separation, and rotary evaporate at 40 °C to obtain water-dispersible surfactant intermediate one.

[0041] S2: Dissolve the first water-dispersible surfactant intermediate in excess ammonia water, then stir at room temperature for 48 hours, extract the organic phase by oil-water separation, and obtain the second water-dispersible surfactant intermediate by rotary evaporation at 40°C.

[0042] S3: Dissolve the water-dispersible surfactant intermediate product 2 in dichloromethane, add triethylamine, and then add bromoalkanes dropwise in an ice bath. After the addition is complete, heat to 50°C and react for 24 hours. Wash with water until neutral, extract the organic phase by oil-water separation, and obtain the main agent by rotary evaporation at 40°C.

[0043] Preferably, the molar ratio of the fatty hydroxyethyl imidazoline, triethylamine, and p-toluenesulfonyl chloride is 1:3:1.5.

[0044] Preferably, the molar ratio of the water-dispersible surfactant intermediate product di-triethylamine to bromoalkane is 1:3:1.1.

[0045] Preferably, the aliphatic hydroxyethyl imidazoline is one of dodecyl hydroxyethyl imidazoline, tetradecyl hydroxyethyl imidazoline, hexadecyl hydroxyethyl imidazoline, or octadecyl hydroxyethyl imidazoline.

[0046] Preferably, the bromoalkane is one of bromododecane, bromotetradecane, bromohexadecane, or bromooctadecane.

[0047] Example 1

[0048] A smart oil-water selective modifier, comprising the following components and mass percentages: 0.3% main agent, 0.12% trigger modifier, 4.0% accelerator, and the remainder being water;

[0049] The main component is 0.3% water-dispersible surfactant, the triggering regulator is 0.12% α-olefin sulfonate, the accelerator is 4.0% diesel oil, and the remainder is water.

[0050] The preparation method of water-dispersible surfactants is as follows:

[0051] (1) Oleic hydroxyethyl imidazoline was dissolved in dichloromethane, triethylamine was added, and then p-toluenesulfonyl chloride was added dropwise in an ice bath. The molar ratio of oleic hydroxyethyl imidazoline, triethylamine and p-toluenesulfonyl chloride was 1:3:1.5. After the addition was completed, the reaction was carried out at room temperature for 24 h. The mixture was washed with water until neutral, and the organic phase was extracted by oil-water separation. After rotary evaporation at 40 °C, water-dispersible surfactant intermediate product 1 was obtained.

[0052] (2) Dissolve the water-dispersible surfactant intermediate one in excess ammonia water, then stir at room temperature for 48 h, extract the organic phase by oil-water separation, and obtain the water-dispersible surfactant intermediate two by rotary evaporation at 40 °C.

[0053] (3) Dissolve intermediate product 2 in dichloromethane, add triethylamine, and then add bromooctadecane dropwise in an ice bath. The molar ratio of water-dispersible surfactant intermediate product 2, triethylamine and bromoalkane is 1:3:1.1. After the addition is completed, heat to 50℃ and react for 24h. Wash with water until neutral, extract the organic phase by oil-water separation, and obtain the water-dispersible surfactant by rotary evaporation at 40℃.

[0054] The triggering modifier (0.12%) was added to water (95.58%) by mass percentage. After complete dissolution, the main agent (0.3%) was added and uniformly dispersed. Then, the accelerator (4.0%) was added and uniformly dispersed to obtain the intelligent oil-water selective driving modifier.

[0055] Take 20 mL of the intelligent oil-water selective modulator and mix it with different volumes of crude oil to adjust the total water content of the system to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95%, respectively.

[0056] The mixture of the intelligent oil-water selective modulator and crude oil was stirred at 600 rpm for 10 minutes to simulate the contact between the intelligent oil-water selective modulator and the formation crude oil, and then the viscosity of the mixture was measured.

[0057] Example 2

[0058] A smart oil-water selective modifier, comprising the following components and mass percentages: 1.0% main agent, 0.26% trigger modifier, and 2.0% accelerator, with the remainder being water;

[0059] The main component is 1.0% water-dispersible surfactant, the triggering regulator is 0.26% fatty alcohol polyoxyethylene ether, the accelerator is 2.0% kerosene, and the remainder is water.

[0060] The preparation method of water-dispersible surfactants is as follows:

[0061] (1) Dissolve lauryl hydroxyethyl imidazoline in dichloromethane, add triethylamine, and then add p-toluenesulfonyl chloride dropwise in an ice bath. The molar ratio of lauryl hydroxyethyl imidazoline, triethylamine and p-toluenesulfonyl chloride is 1:3:1.5. After the addition is complete, react at room temperature for 24 h, wash with water until neutral, extract the organic phase by oil-water separation, and obtain water-dispersible surfactant intermediate one by rotary evaporation at 40 °C.

[0062] (2) Dissolve the water-dispersible surfactant intermediate one in excess ammonia water, then stir at room temperature for 48 h, extract the organic phase by oil-water separation, and obtain the water-dispersible surfactant intermediate two by rotary evaporation at 40 °C.

[0063] (3) Dissolve intermediate product 2 in dichloromethane, add triethylamine, and then add bromododecane dropwise in an ice bath. The molar ratio of water-dispersible surfactant intermediate product 2, triethylamine and bromoalkane is 1:3:1.1. After the addition is completed, heat to 50℃ and react for 24h. Wash with water until neutral, extract the organic phase by oil-water separation, and obtain the water-dispersible surfactant by rotary evaporation at 40℃.

[0064] The triggering modifier (0.26%) was added to water (96.74%) by mass percentage. After complete dissolution, the main agent (1.0%) was added and uniformly dispersed. Then, the accelerator (2.0%) was added and uniformly dispersed to obtain the intelligent oil-water selective driving modifier.

[0065] Take 20 mL of the intelligent oil-water selective modulator and mix it with different volumes of crude oil to adjust the total water content of the system to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95%, respectively.

[0066] The mixture of the intelligent oil-water selective modulator and crude oil was stirred at 600 rpm for 10 minutes to simulate the contact between the intelligent oil-water selective modulator and the formation crude oil, and then the viscosity of the mixture was measured.

[0067] Example 3

[0068] A smart oil-water selective modifier, comprising the following components and mass percentages: 0.5% main agent, 0.36% trigger modifier, and 5.0% accelerator, with the remainder being water;

[0069] The main component is 0.5% water-dispersible surfactant, the triggering regulator is 0.36% Tween 60, the accelerator is 5.0% light crude oil, and the remainder is water.

[0070] The preparation method of water-dispersible surfactants is as follows:

[0071] (1) Dissolve lauryl hydroxyethyl imidazoline in dichloromethane, add triethylamine, and then add p-toluenesulfonyl chloride dropwise in an ice bath. The molar ratio of oleyl hydroxyethyl imidazoline, triethylamine and p-toluenesulfonyl chloride is 1:3:1.5. After the addition is complete, react at room temperature for 24 h, wash with water until neutral, extract the organic phase by oil-water separation, and obtain water-dispersible surfactant intermediate one by rotary evaporation at 40 °C.

[0072] (2) Dissolve the water-dispersible surfactant intermediate one in excess ammonia water, then stir at room temperature for 48 h, extract the organic phase by oil-water separation, and obtain the water-dispersible surfactant intermediate two by rotary evaporation at 40 °C.

[0073] (3) Dissolve intermediate product 2 in dichloromethane, add triethylamine, and then add bromohexadecane dropwise in an ice bath. The molar ratio of water-dispersible surfactant intermediate product 2, triethylamine and bromoalkane is 1:3:1.1. After the addition is completed, heat to 50℃ and react for 24h. Wash with water until neutral, extract the organic phase by oil-water separation, and obtain the water-dispersible surfactant by rotary evaporation at 40℃.

[0074] The triggering modifier (0.36%) was added to water (94.14%) by mass percentage. After complete dissolution, the main agent (0.5%) was added and uniformly dispersed. Then, the accelerator (5.0%) was added and uniformly dispersed to obtain the intelligent oil-water selective driving modifier.

[0075] Take 20 mL of the intelligent oil-water selective modulator and mix it with different volumes of crude oil to adjust the total water content of the system to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95%, respectively.

[0076] The mixture of the intelligent oil-water selective modulator and crude oil was stirred at 600 rpm for 10 minutes to simulate the contact between the intelligent oil-water selective modulator and the formation crude oil, and then the viscosity of the mixture was measured.

[0077] Comparative Example 1:

[0078] A smart oil-water selective modifier, comprising the following components and mass percentages: 0% main agent, 0.36% trigger modifier, 5.0% accelerator, and the remainder being water;

[0079] The triggering regulator is 0.36% Tween 60, the promoter is 5.0% light crude oil, and the remainder is water.

[0080] The triggering modifier (0.36%) was added to water (94.64%) by mass percentage. After complete dissolution, the accelerator (5.0%) was added and the mixture was evenly dispersed to obtain the intelligent oil-water selective driving modifier.

[0081] Take 20 mL of the intelligent oil-water selective modulator and mix it with different volumes of crude oil to adjust the total water content of the system to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95%, respectively.

[0082] The mixture of the intelligent oil-water selective modulator and crude oil was stirred at 600 rpm for 10 minutes to simulate the contact between the intelligent oil-water selective modulator and the formation crude oil, and then the viscosity of the mixture was measured.

[0083] Comparative Example 2:

[0084] A smart oil-water selective modifier, comprising the following components and mass percentages: 0.5% main agent, 0.36% trigger modifier, and 0% accelerator, with the remainder being water;

[0085] The main component is 0.5% water-dispersible surfactant, the triggering regulator is 0.36% Tween 60, and the remainder is water.

[0086] The preparation method of water-dispersible surfactants is as follows:

[0087] (1) Dissolve lauryl hydroxyethyl imidazoline in dichloromethane, add triethylamine, and then add p-toluenesulfonyl chloride dropwise in an ice bath. The molar ratio of oleyl hydroxyethyl imidazoline, triethylamine and p-toluenesulfonyl chloride is 1:3:1.5. After the addition is complete, react at room temperature for 24 h, wash with water until neutral, extract the organic phase by oil-water separation, and obtain water-dispersible surfactant intermediate one by rotary evaporation at 40 °C.

[0088] (2) Dissolve the water-dispersible surfactant intermediate one in excess ammonia water, then stir at room temperature for 48 h, extract the organic phase by oil-water separation, and obtain the water-dispersible surfactant intermediate two by rotary evaporation at 40 °C.

[0089] (3) Dissolve intermediate product 2 in dichloromethane, add triethylamine, and then add bromohexadecane dropwise in an ice bath. The molar ratio of water-dispersible surfactant intermediate product 2, triethylamine and bromoalkane is 1:3:1.1. After the addition is completed, heat to 50℃ and react for 24h. Wash with water until neutral, extract the organic phase by oil-water separation, and obtain the water-dispersible surfactant by rotary evaporation at 40℃.

[0090] The triggering modifier (0.36%) was added to water (99.14%) by mass percentage. After complete dissolution, the main agent (0.5%) was added and uniformly dispersed to obtain the intelligent oil-water selective driving modifier.

[0091] Take 20 mL of the intelligent oil-water selective modulator and mix it with different volumes of crude oil to adjust the total water content of the system to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95%, respectively.

[0092] The mixture of the intelligent oil-water selective modulator and crude oil was stirred at 600 rpm for 10 minutes to simulate the contact between the intelligent oil-water selective modulator and the formation crude oil, and then the viscosity of the mixture was measured.

[0093] The measurement results of the intelligent oil-water selective modifiers prepared in Examples 1-3 and Comparative Examples 1-2 are as follows: Figure 1 As shown, Figure 1 This is a graph showing the relationship between the total water content and the viscosity of the mixture in the regulating system of the intelligent oil-water selective displacement agent of this invention. Figure 1It can be seen that Examples 1-3 all exhibit crude oil responsiveness, with viscosity gradually increasing with increasing water content. Among them, under the same water content conditions, Example 2 has the highest viscosity, followed by Example 1, and Example 3 has the lowest viscosity. Comparative Example 1 did not show significant crude oil responsiveness within the experimental water content range, and its viscosity did not change significantly. Comparative Example 2 showed some crude oil responsiveness, but its viscosity decreased sharply when the water content exceeded 90%.

[0094] The intelligent oil-water selective modifiers prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to a plugging rate test. The specific steps of the plugging rate test are as follows:

[0095] 1) Water blocking rate test: The artificial core is loaded into the core holder, saturated with water, and its water phase permeability (K) is measured. w1 Then, 10 mL of the intelligent oil-water selective displacement agent was injected, and the permeability (K) after adding the intelligent oil-water selective displacement agent was measured with water. w2 ), K w2 and K w1 The ratio (K) w2 / K w1 This is the water blocking rate.

[0096] 2) Oil plugging rate test: The artificial core is loaded into the core holder, saturated with oil, and its oil phase permeability (K) is measured. o1 Then, 10 mL of the intelligent oil-water selective displacement agent was injected, and the permeability (K) after adding the intelligent oil-water selective displacement agent was measured using oil. o2 ), K o2 and K o1 (K) o2 / K o1 This is the oil blockage rate.

[0097] 3) Test Results: Table 1 shows the test results of water blocking rate and oil blocking rate for the examples and comparative examples. As shown in Table 1, the intelligent oil-water selective modulator prepared in Example 1 had a water blocking rate of 99.1% and an oil blocking rate of 3.66%; the intelligent oil-water selective modulator prepared in Example 2 had a water blocking rate of 98.4% and an oil blocking rate of 1.28%; and the intelligent oil-water selective modulator prepared in Example 3 had a water blocking rate of 99.4% and an oil blocking rate of 2.49%. All the above examples showed good oil-water selective blocking properties, with Example 3 having the highest water blocking rate and Example 2 having the lowest oil blocking rate. Comparative Example 1 had a lower rate than Examples 1-3, at only 28.6%, but its oil blocking rate was as high as 54.62%, failing to achieve selective blocking of water without blocking oil. Comparative Example 2 did not show significant blocking effect for either oil or water, with a water blocking rate of 3.68% and an oil blocking rate of 8.93%.

[0098] Table 1. Test results of water blocking rate and oil blocking rate for the examples and comparative examples.

[0099] project Main agent Trigger regulator Accelerator water Water blocking rate Oil blockage rate Example 1 0.3％ 0.12％ 4.0％ 95.58％ 99.1％ 3.66％ Example 2 1.0％ 0.26％ 2.0％ 96.74％ 98.4％ 1.28％ Example 3 0.5％ 0.36％ 5.0％ 94.14％ 99.4％ 2.49％ Comparative Example 1 0％ 0.36％ 5.0％ 94.64％ 28.6％ 54.62％ Comparative Example 2 0.5％ 0.36％ 0％ 99.14％ 3.68％ 8.93％

[0100] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent oil-water selective profile control agent, characterized in that, The component and mass percentage of the profile control agent are: 0.3%-1.0% of the main agent, 0.1%-0.5% of the trigger regulator and 0-5.0% of the promoter, and the rest is water; The main agent is a water-dispersible surfactant molecule, the trigger regulator is a water-soluble surfactant molecule, and the promoter is oil. The water-dispersible surfactant molecule has the following structure: ； R1 and R2 are both alkyl fatty chains with a length of 12-18; The water-soluble surfactant molecule is one or more of alpha-olefin sulfonate, fatty alcohol polyoxyethylene ether and Tween. 2.The intelligent oil-water selective profile control agent of claim 1, characterized in that, The oil is one or more of diesel oil, kerosene and light crude oil.

3. A preparation method of the intelligent oil-water selective profile control agent, for preparing the intelligent oil-water selective profile control agent according to any one of claims 1-2, characterized in that, The preparation method comprises: The trigger regulator is added to water, completely dissolved, and then the main agent is uniformly dispersed, followed by the addition of the promoter, and the intelligent oil-water selective profile control agent is obtained after uniform dispersion.

4. The preparation method of the intelligent oil-water selective profile control agent according to claim 3, characterized in that, The synthesis method of the main agent is as follows: S1: dissolve the fatty-based hydroxyethyl imidazoline in dichloromethane, add triethylamine, then add p-toluenesulfonyl chloride dropwise in an ice bath, react at room temperature for 24h after dropwise addition is completed, wash with water until neutral, extract the organic phase by oil-water layering, and obtain water-dispersible surfactant intermediate product one after rotary evaporation at 40℃; S2: dissolve the water-dispersible surfactant intermediate product one in excess ammonia water, then stir at room temperature for 48h, extract the organic phase by oil-water layering, and obtain water-dispersible surfactant intermediate product two after rotary evaporation at 40℃; S3: dissolve the water-dispersible surfactant intermediate product two in dichloromethane, add triethylamine, then add bromoalkane dropwise in an ice bath, react at 50℃ for 24h after dropwise addition is completed, wash with water until neutral, extract the organic phase by oil-water layering, and obtain the main agent after rotary evaporation at 40℃.

5. The preparation method of the intelligent oil-water selective profile control agent according to claim 4, characterized in that, The molar ratio of the fatty-based hydroxyethyl imidazoline, triethylamine and p-toluenesulfonyl chloride is 1:3:1.

5.

6. The preparation method of the intelligent oil-water selective profile control agent according to claim 4, characterized in that, The molar ratio of the water-dispersible surfactant intermediate product two, triethylamine and bromoalkane is 1:3:1.

1.

7. The preparation method of the intelligent oil-water selective profile control agent according to claim 4, characterized in that, The fatty-based hydroxyethyl imidazoline is one of dodecyl hydroxyethyl imidazoline, tetradecyl hydroxyethyl imidazoline, hexadecyl hydroxyethyl imidazoline or octadecyl hydroxyethyl imidazoline.

8. The preparation method of the intelligent oil-water selective profile control agent according to claim 4, characterized in that, The bromoalkane is one of bromododecane, bromotetradecane, bromohexadecane or bromooctadecane.

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