Preparation method of carboxylic acid betaine type molecular film oil-displacing agent for tertiary oil recovery
By using double-length alkyl carbon chain molecular membrane oil repellent and combining cashew phenol carboxylate surfactant and polyacrylamide, the simple performance problem of existing single-length alkyl carbon chain molecular membrane oil repellent is solved, and the problem of simple performance of existing single-length alkyl carbon chain molecular membrane oil repellent is achieved. The more efficient oil-water interface reduction and emulsification ability significantly improves the oil-repellent effect.
Patent Information
- Application Number
- CN202411648787.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-02-14
AI Technical Summary
The existing carboxylic betaine type molecular membrane oil repellent is a single-length alkyl carbon chain molecular membrane oil repellent, which has relatively simple performance and is difficult to meet the needs of efficient oil repellent.
Double-length alkyl carbon chain molecular membrane oil repellent is used, and the cardanol carboxylate surfactant and polyacrylamide are used as additives to synergistically improve the surfactivity and emulsification ability of the oil repellent.
The surfactivity and emulsification ability of the oil-repellent reactor are improved, and the tension of the oil-water interface can be reduced more quickly and effectively, forming a stable emulsion, reducing the viscosity of crude oil, and significantly improving the oil-repellent effect.
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Figure CN119432347A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of molecular membrane oil-displacing agents, and more specifically to a method for preparing a carboxylic acid betaine type molecular membrane oil-displacing agent for tertiary oil recovery. Background Art
[0002] As a new type of tertiary oil recovery technology, molecular membrane flooding technology has incomparable characteristics and advantages over traditional chemical flooding: 1. In terms of improving oil recovery, molecular membrane flooding is mainly based on the imbibition mechanism. The imbibition effect of membrane flooding is more conducive to the start-up of residual oil in medium and small pores. Therefore, the molecular membrane flooding efficiency is higher. 2. From the nature of the molecular membrane flooding agent itself, the film-forming process is a self-assembly process that does not add any external force and relies on the equilibrium state of electrostatic interaction between the rock surface and the film-forming molecules. The thermal stability and mechanical stability of the molecular membrane are good; 3. The molecular membrane flooding agent has a low concentration and a high oil recovery effect. It does not require the addition of alkali, surfactants and other chemical reagents, and has little damage to the formation; in addition, the membrane flooding agent has a good anti-swelling effect and bactericidal ability; its surface activity is not high, and it will not produce adverse effects on crude oil emulsification.
[0003] At present, carboxylic acid betaine type molecular membrane oil-displacing agent is a kind of high molecular surfactant oil-displacing agent, which is widely used in the oil recovery process. However, carboxylic acid betaine molecular membrane oil-displacing agent is mostly single-length alkyl carbon chain molecular membrane oil-displacing agent, which has relatively simple performance and gradually cannot meet people's use needs. Therefore, the present invention proposes a preparation method of carboxylic acid betaine type molecular membrane oil-displacing agent for tertiary oil recovery. Summary of the invention
[0004] 1. Technical issues to be solved In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for preparing a carboxylic acid betaine type molecular membrane oil-displacing agent for tertiary oil recovery. The carboxylic acid betaine type molecular membrane oil-displacing agent in this scheme is a double-long alkyl carbon chain molecular membrane oil-displacing agent. Compared with the existing single-long alkyl carbon chain molecular membrane oil-displacing agent, the chain-chain interaction of the double hydrophobic chains makes the molecules arranged more closely at the interface, and its surface activity is higher than that of the corresponding single alkyl chain surface activity, and the interfacial performance and emulsification ability are better. It can more quickly and effectively reduce the tension of the oil-water interface, so that the originally immiscible oil and water form a stable emulsion, reduce the viscosity of crude oil, so that the oil is quickly expelled, and the oil displacement effect is more significant. In addition, the carboxylic acid betaine type molecular membrane oil-displacing agent in this scheme uses cardanol carboxylate surfactant as an auxiliary agent to assist didodecyl methyl betaine, and combines with polyacrylamide, so that the three can cooperate with each other, work together, and complement each other, which not only effectively increases the swept area, but also effectively reduces the oil-water interfacial tension, so that the oil-displacing agent can achieve better oil displacement effect, strong stability, and good practicality.
[0005] Technical Solution
[0006] To solve the above problems, the present invention adopts the following technical solutions.
[0007] A method for preparing a carboxylic acid betaine type molecular membrane flooding agent for tertiary oil recovery, comprising the following components in percentage by weight: 25-35% of a di-long chain alkyl methyl tertiary amine, 30-42% of chloroacetic acid, 30-42% of a 20% sodium hydroxide solution, 10-14% of polyacrylamide, 60-80% of deionized water, and 5-7% of a surfactant, and comprising the following preparation steps: S1, first add deionized water to the reactor, then add di-long-chain alkyl methyl tertiary amine and chloroacetic acid to the reactor in sequence, mix and heat, then add 20% sodium hydroxide solution to the reactor, so that the di-long-chain alkyl methyl tertiary amine and chloroacetic acid react in the presence of sodium hydroxide; S2. After the reaction is completed, the product in the reactor is cooled to room temperature of 25° C., the product is taken out and placed for static separation to obtain didodecyl methyl betaine, and then the didodecyl methyl betaine is placed in a vacuum dryer for drying to obtain didodecyl methyl betaine solid; S3. Then, deionized water is added into the mixer, and then didodecyl methyl betaine, polyacrylamide and surfactant are added into the mixer for stirring and mixing. After all of them are dissolved, the mixture is cooled to room temperature (25° C.), and a molecular film oil displacement agent is obtained.
[0008] Furthermore, the molar ratio of the di-long-chain alkylmethyl tertiary amine to chloroacetic acid in S2 is 1:1.2, and the molar ratio of chloroacetic acid to sodium hydroxide is 1:1.
[0009] Furthermore, the reaction operation steps in S2 are: first, add di-long-chain alkylmethyl tertiary amine and chloroacetic acid to the reactor, and drive the stirring rod in the reactor to drive the di-long-chain alkylmethyl tertiary amine and chloroacetic acid to be mixed in deionized water, and heat them at the same time to drive the internal temperature of the reactor to increase, and then slowly add 20% sodium hydroxide solution through the dropping funnel, the dropping time is 0.5-0.7 hours, and then add deionized water through the dropping funnel during the reaction process to perform water replenishment operation.
[0010] Furthermore, the reaction temperature in the reactor in S2 is in the range of 90° C.-95° C., and the reaction time in the reactor is in the range of 6-8 hours.
[0011] Furthermore, the static separation operation step of the didodecyl methyl betaine product in S2 is as follows: placing the product after the reaction in a separatory funnel, standing it to separate into two layers, removing the aqueous phase of the lower layer, and collecting the material of the upper layer.
[0012] Furthermore, the drying temperature of the vacuum dryer in S2 is 45° C.-50° C., and the drying time of the vacuum dryer is 2-3 hours.
[0013] Furthermore, the stirring and mixing operation steps in S3 are: first add deionized water into the mixer, then add didodecyl methyl betaine, polyacrylamide and surfactant into the mixer in a molar ratio of 5:2:1, stir and mix, the stirring speed is 100-200 rpm, the internal temperature of the mixer is 40°C-50°C, and deionized water is added during the stirring process using a dropping funnel to perform a water replenishment operation.
[0014] Furthermore, during the stirring process of the mixer, the staff is required to observe the dissolution of the materials in the internal mixed liquid in real time, and stop stirring after all the materials are dissolved.
[0015] Furthermore, the surfactant is a cardanol carboxylate surfactant.
[0016] Beneficial Effects
[0017] Compared with the prior art, the advantages of the present invention are: (1) The carboxylic acid betaine type molecular membrane oil displacement agent in this scheme is a double-long alkyl carbon chain molecular membrane oil displacement agent. Compared with the existing single-long alkyl carbon chain molecular membrane oil displacement agent, the chain-chain interaction of the double hydrophobic chains makes the molecules arranged more tightly at the interface. Its surface activity is higher than that of the corresponding single alkyl chain surface activity, and its interfacial performance and emulsification ability are better. It can more quickly and effectively reduce the tension of the oil-water interface, so that the originally immiscible oil and water form a stable emulsion, reduce the viscosity of the crude oil, so that the oil can be quickly expelled, and the oil displacement effect is more significant.
[0018] (2) The carboxylic acid betaine type molecular membrane oil displacement agent in this scheme uses cardanol carboxylate surfactant as an auxiliary agent to assist didodecyl methyl betaine, and combined with polyacrylamide, it can make the three of them work together and complement each other, not only effectively increase the affected area, but also effectively reduce the oil-water interfacial tension, so as to enable the oil displacement agent to achieve better oil displacement effect, strong stability and good practicality. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the preparation process of the present invention; DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.
[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0023] Example 1
[0024] See also Figure 1 A method for preparing a carboxylic acid betaine type molecular membrane flooding agent for tertiary oil recovery, wherein the mass percentages of di-long chain alkyl methyl tertiary amine, chloroacetic acid, 20% sodium hydroxide solution, polyacrylamide, deionized water and surfactant are selected as shown in Table 1:.
[0025] Element Di-long chain alkyl methyl tertiary amine Chloroacetic acid 20% sodium hydroxide solution Polyacrylamide Deionized water Surfactants Mass percentage 25% 30% 30% 10% 60% 5% S1, first take 60% of the deionized water and add it to the reactor, then add 25% of the di-long-chain alkyl methyl tertiary amine and 30% of the chloroacetic acid to the reactor in sequence, and drive the stirring rod in the reactor to drive the di-long-chain alkyl methyl tertiary amine and chloroacetic acid to mix in the deionized water, and heat them at the same time to drive the internal temperature of the reactor to rise to 90 ° C, then slowly add 30% of the 20% sodium hydroxide solution to the reactor through a dropping funnel, the dropping time is 0.5 hours, the di-long-chain alkyl methyl tertiary amine and chloroacetic acid react in the presence of sodium hydroxide, and then add deionized water through the dropping funnel during the reaction to perform a water replenishment operation, and the reaction time in the reactor is 6 hours; S2. After the reaction is completed, the product in the reactor is cooled to room temperature of 25°C, the product is taken out and placed in a separatory funnel, and allowed to stand and separate into two layers, the aqueous phase of the lower layer is removed, and the material of the upper layer is collected to obtain didodecyl methyl betaine, and then the didodecyl methyl betaine is placed in a vacuum dryer and dried at 45°C for 2 hours to obtain didodecyl methyl betaine solid; S3, then add the remaining part of the deionized water into the mixer, then add the didodecyl methyl betaine in S2, 10% of the polyacrylamide and 5% of the surfactant into the mixer, stir and mix at a temperature of 40°C at a stirring speed of 100 rpm, and add the remaining deionized water into the mixer through a dropping funnel during the stirring process to replenish water. During the stirring process, the staff needs to observe the dissolution of the materials in the internal mixed liquid in real time. After all the materials are dissolved, the stirring is stopped and wait for it to drop to room temperature of 25°C. The molecular membrane oil displacement agent can be obtained by taking it out.
[0026] Example 2
[0027] See also Figure 1 A method for preparing a carboxylic acid betaine type molecular membrane flooding agent for tertiary oil recovery, wherein the mass percentages of di-long chain alkyl methyl tertiary amine, chloroacetic acid, 20% sodium hydroxide solution, polyacrylamide, deionized water and surfactant are selected as shown in Table 2:.
[0028] Element Di-long chain alkyl methyl tertiary amine Chloroacetic acid 20% sodium hydroxide solution Polyacrylamide Deionized water Surfactants Mass percentage 35% 42% 42% 14% 80% 7% S1, first take 80% of the deionized water and add it to the reactor, then add 35% of the di-long-chain alkyl methyl tertiary amine and 42% of the chloroacetic acid to the reactor in sequence, and drive the stirring rod in the reactor to drive the di-long-chain alkyl methyl tertiary amine and chloroacetic acid to mix in the deionized water, and heat them at the same time to drive the internal temperature of the reactor to rise to 95 ° C, then slowly add 42% of the 20% sodium hydroxide solution to the reactor through a dropping funnel, the dropping time is 0.7 hours, the di-long-chain alkyl methyl tertiary amine and chloroacetic acid react in the presence of sodium hydroxide, and then add deionized water through the dropping funnel during the reaction to perform a water replenishment operation, and the reaction time in the reactor lasts for 8 hours; S2. After the reaction is completed, the product in the reactor is cooled to room temperature of 25°C, the product is taken out and placed in a separatory funnel, and allowed to stand and separate into two layers, the aqueous phase of the lower layer is removed, and the material of the upper layer is collected to obtain didodecyl methyl betaine, and then the didodecyl methyl betaine is placed in a vacuum dryer and dried at 50°C for 3 hours to obtain didodecyl methyl betaine solid; S3, then add the remaining part of the deionized water into the mixer, then add the didodecyl methyl betaine in S2, 14% of the polyacrylamide and 7% of the surfactant into the mixer, and stir and mix at a stirring speed of 200 rpm under a temperature environment of 50°C. At the same time, during the stirring process, the last remaining deionized water is added to the inside of the mixer through a dropping funnel to perform a water replenishment operation. During the stirring process, the staff is required to observe the dissolution of the materials in the internal mixed liquid in real time. After all the materials are dissolved, the stirring is stopped and waited for it to drop to room temperature of 25°C. The molecular membrane oil displacement agent can be obtained by taking it out.
[0029] The specific operation time and temperature requirements of Example 1 and Example 2 in this scheme are shown in Table 3: Example Example 1 Example 2 Reactor temperature 90℃ 95℃ Reactor reaction time 6 hours 8 hours Adding time 0.5 hours 0.7 hours Drying temperature 45℃ 50℃ Drying time 2 hours 3 hours Mixer temperature 40℃ 50℃ Mixer speed 100 rpm 200 rpm The carboxylic acid betaine type molecular film oil displacement agent in this scheme uses cardanol carboxylate surfactant as an auxiliary agent to assist didodecyl methyl betaine, and combined with polyacrylamide, the three can work together and complement each other, not only effectively increasing the affected area, but also effectively reducing the oil-water interfacial tension, so as to enable the oil displacement agent to achieve better oil displacement effect, strong stability and good practicality. The carboxylic acid betaine type molecular film oil displacement agent is a double-long alkyl carbon chain molecular film oil displacement agent. Compared with the existing single-long alkyl carbon chain molecular film oil displacement agent, the chain-chain interaction of the double hydrophobic chains makes the molecules arranged more closely at the interface, and its surface activity is higher than that of the corresponding single alkyl chain, and the interfacial performance and emulsification ability are better. It can more quickly and effectively reduce the tension of the oil-water interface, so that the originally immiscible oil and water form a stable emulsion, reduce the viscosity of crude oil, so that the oil is quickly expelled, and the oil displacement effect is more significant.
[0030] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A method for preparing a carboxylic acid betaine type molecular membrane oil displacement agent for tertiary oil recovery, characterized in that: The composition comprises the following components in percentage by weight: 25-35% of di-long chain alkyl methyl tertiary amine, 30-42% of chloroacetic acid, 30-42% of 20% sodium hydroxide solution, 10-14% of polyacrylamide, 60-80% of deionized water, and 5-7% of surfactant, and comprises the following preparation steps: S1, first add deionized water to the reactor, then add di-long-chain alkyl methyl tertiary amine and chloroacetic acid to the reactor in sequence, mix and heat, then add 20% sodium hydroxide solution to the reactor, so that the di-long-chain alkyl methyl tertiary amine and chloroacetic acid react in the presence of sodium hydroxide; S2. After the reaction is completed, the product in the reactor is cooled to room temperature of 25° C., the product is taken out and placed for static separation to obtain didodecyl methyl betaine, and then the didodecyl methyl betaine is placed in a vacuum dryer for drying to obtain didodecyl methyl betaine solid; S3. Then, deionized water is added into the mixer, and then didodecyl methyl betaine, polyacrylamide and surfactant are added into the mixer for stirring and mixing. After all of them are dissolved, the mixture is cooled to room temperature (25° C.), and a molecular film oil displacement agent is obtained.
2. The method for preparing a carboxylic acid betaine type molecular membrane oil displacement agent for tertiary oil recovery according to claim 1, characterized in that: The molar ratio of the di-long-chain alkylmethyl tertiary amine to chloroacetic acid in S2 is 1:1.2, and the molar ratio of chloroacetic acid to sodium hydroxide is 1:
1.
3. The method for preparing a carboxylic acid betaine type molecular membrane oil displacement agent for tertiary oil recovery according to claim 1, characterized in that: The reaction operation steps in S2 are as follows: first, di-long-chain alkylmethyl tertiary amine and chloroacetic acid are added to the reactor, and the stirring rod in the reactor is driven to drive the di-long-chain alkylmethyl tertiary amine and chloroacetic acid to be mixed in deionized water, and heated at the same time to drive the internal temperature of the reactor to increase, and then slowly add 20% sodium hydroxide solution through the dropping funnel, the dropping time is 0.5-0.7 hours, and then add deionized water through the dropping funnel during the reaction process to perform water replenishment operation.
4. The method for preparing a carboxylic acid betaine type molecular membrane oil displacement agent for tertiary oil recovery according to claim 1, characterized in that: The reaction temperature in the reactor in S2 is in the range of 90°C-95°C, and the reaction time in the reactor is in the range of 6-8 hours.
5. The method for preparing a carboxylic acid betaine type molecular membrane oil displacement agent for tertiary oil recovery according to claim 1, characterized in that: The static separation operation steps of the didodecyl methyl betaine product in S2 are as follows: placing the product after the reaction in a separatory funnel, standing it to separate into two layers, removing the aqueous phase of the lower layer, and collecting the material of the upper layer.
6. The method for preparing a carboxylic acid betaine type molecular membrane oil displacement agent for tertiary oil recovery according to claim 1, characterized in that: The drying temperature of the vacuum dryer in S2 is 45° C.-50° C., and the drying time of the vacuum dryer is 2-3 hours.
7. The method for preparing a carboxylic acid betaine type molecular membrane oil displacement agent for tertiary oil recovery according to claim 1, characterized in that: The stirring and mixing operation steps in S3 are: first add deionized water into the mixer, then add didodecyl methyl betaine, polyacrylamide and surfactant into the mixer in a molar ratio of 5:2:1, stir and mix, the stirring speed is 100-200 rpm, the internal temperature of the mixer is 40°C-50°C, and deionized water is added during the stirring process using a dropping funnel to perform a water replenishment operation.
8. The method for preparing a carboxylic acid betaine type molecular membrane oil displacement agent for tertiary oil recovery according to claim 7, characterized in that: During the stirring process of the stirrer, the staff is required to observe the dissolution of the materials in the internal mixed liquid in real time, and stop stirring after all the materials are dissolved.
9. The method for preparing a carboxylic acid betaine type molecular membrane oil displacement agent for tertiary oil recovery according to claim 1, characterized in that: The surfactant is a cardanol carboxylate surfactant.