High-performance carbon dioxide corrosion inhibitor and preparation method thereof

Abstract

The invention discloses a high-performance carbon dioxide corrosion inhibitor which comprises the following components in parts by mass: 5-6 parts of polyether amine, 2-3 parts of organic acid, 1-1.5 parts of a surfactant and 0.5-0.8 part of an auxiliary agent. The invention also discloses a preparation method of the high-performance carbon dioxide corrosion inhibitor, which comprises the following specific steps: step 1, respectively weighing the materials in parts by mass, mixing, and uniformly stirring to obtain a mixture; 2, heating the mixture obtained in the step 1 to obtain a reaction product; and 3, cooling the reaction product obtained in the step 2 to room temperature to obtain the high-performance carbon dioxide corrosion inhibitor. According to the high-performance carbon dioxide corrosion inhibitor provided by the invention, polyether amine is adopted as a main corrosion inhibition component, so that the high-performance carbon dioxide corrosion inhibitor has excellent temperature resistance and salt resistance and can effectively prevent carbon dioxide from corroding metal in a high-temperature and high-salt environment; by adding the organic acid, the surfactant, the auxiliary agent and other components, the corrosion inhibition effect is further enhanced, and the dispersity and stability of the corrosion inhibitor are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal corrosion protection, relates to a high-performance carbon dioxide corrosion inhibitor, and also relates to a method for preparing the high-performance carbon dioxide corrosion inhibitor. Background Art

[0002] Carbon dioxide corrosion is a common problem in oilfield exploitation, industrial production, and energy storage. Carbon dioxide combines with water to form carbonic acid, which in turn corrodes metal equipment, seriously affecting the service life and safety performance of the equipment. Therefore, it is of great significance to develop a carbon dioxide corrosion inhibitor with superior performance, easy raw materials, simple preparation, and environmental protection. Summary of the invention

[0003] The purpose of the present invention is to provide a high-performance carbon dioxide corrosion inhibitor having the characteristics of inhibiting carbon dioxide corrosion in oilfield water systems.

[0004] Another object of the present invention is to provide a method for preparing the above-mentioned high-performance carbon dioxide corrosion inhibitor.

[0005] Another object of the present invention is to provide application of the above-mentioned high-performance carbon dioxide corrosion inhibitor.

[0006] The technical solution adopted by the present invention is that the high-performance carbon dioxide corrosion inhibitor comprises, by weight, 5-6 parts of polyether amine, 2-3 parts of organic acid, 1-1.5 parts of surfactant, and 0.5-0.8 parts of auxiliary agent.

[0007] The present invention is also characterized in that: The organic acid is benzoic acid or citric acid.

[0008] The surfactant is sodium dodecyl sulfate or hexadecyltrimethylammonium bromide.

[0009] The auxiliary agent is sodium silicate or potassium silicate.

[0010] Another technical solution adopted by the present invention is a method for preparing a high-performance carbon dioxide corrosion inhibitor, and the specific steps are as follows: Step 1: Weigh 5-6 parts of polyetheramine, 2-3 parts of organic acid, 1-1.5 parts of surfactant and 0.5-0.8 parts of auxiliary agent respectively by mass, mix and stir evenly to obtain a mixture; Step 2: heating the mixture obtained in step 1 to 80-90° C. and maintaining the temperature for 2-3 hours to obtain a reaction product; Step 3: Cool the reaction product obtained in step 2 to room temperature to obtain a high-performance carbon dioxide corrosion inhibitor, which comprises, by mass, 5 to 6 parts of polyether amine, 2 to 3 parts of organic acid, 1 to 1.5 parts of surfactant, and 0.5 to 0.8 parts of additive.

[0011] Another technical solution adopted by the present invention is the application of high-performance carbon dioxide corrosion inhibitor for surface corrosion inhibition of metal equipment in oil and gas fields.

[0012] The beneficial effects of the present invention are: The high-performance carbon dioxide corrosion inhibitor provided by the present invention adopts polyetheramine as the main corrosion inhibition component, has excellent temperature resistance and salt resistance, and can effectively prevent carbon dioxide from corroding metals in a high temperature and high salt environment; the present invention further enhances the corrosion inhibition effect by adding components such as organic acids, surfactants and additives, and improves the dispersibility and stability of the corrosion inhibitor; the preparation method of the present invention is simple, the raw materials are easily available, and the product is environmentally friendly and pollution-free, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a corrosion rate diagram of different materials using the high-performance carbon dioxide corrosion inhibitor of the present invention; Figure 2 The corrosion morphology of different materials using the high-performance carbon dioxide corrosion inhibitor of the present invention; Figure 3 It is a corrosion rate diagram of different materials without using the high-performance carbon dioxide corrosion inhibitor of the present invention; Figure 4 These are corrosion morphologies of different materials without using the high-performance carbon dioxide corrosion inhibitor of the present invention. DETAILED DESCRIPTION

[0014] The present invention is described in detail below in conjunction with specific implementation modes.

[0015] The high-performance carbon dioxide corrosion inhibitor includes, by weight, 5-6 parts of polyetheramine, 2-3 parts of organic acid, 1-1.5 parts of surfactant, and 0.5-0.8 parts of additives. Polyetheramine, as the main corrosion inhibition component, has excellent temperature and salt resistance, and can form a dense protective film to effectively prevent carbon dioxide from corroding the metal. The organic acid, surfactant and additives respectively play the role of enhancing the corrosion inhibition effect, improving the dispersibility and stability.

[0016] The organic acid is benzoic acid or citric acid. The surfactant is sodium dodecyl sulfate or hexadecyl trimethyl ammonium bromide. The auxiliary agent is sodium silicate or potassium silicate.

[0017] The preparation method of high-performance carbon dioxide corrosion inhibitor, the specific steps are as follows: Step 1: Weigh 5-6 parts of polyetheramine, 2-3 parts of organic acid, 1-1.5 parts of surfactant and 0.5-0.8 parts of auxiliary agent respectively by mass, mix and stir evenly to obtain a mixture; Step 2: heating the mixture obtained in step 1 to 80-90° C. and maintaining the temperature for 2-3 hours to obtain a reaction product; Step 3: Cool the reaction product obtained in step 2 to room temperature to obtain a high-performance carbon dioxide corrosion inhibitor, which comprises, by mass, 5 to 6 parts of polyether amine, 2 to 3 parts of organic acid, 1 to 1.5 parts of surfactant, and 0.5 to 0.8 parts of additive.

[0018] The application of high-performance carbon dioxide corrosion inhibitor is used for surface corrosion inhibition of metal equipment in oil and gas fields.

[0019] Example 1 The preparation method of high-performance carbon dioxide corrosion inhibitor, the specific steps are as follows: Step 1: Weigh 5 parts of polyetheramine, 2 parts of benzoic acid, 1 part of sodium lauryl sulfate and 0.5 parts of sodium silicate by mass, mix them, and stir them evenly to obtain a mixture; Step 2: heating the mixture obtained in step 1 to 80° C. and maintaining the temperature for 2 hours to obtain a reaction product; Step 3: Cool the reaction product obtained in step 2 to room temperature to obtain a high-performance carbon dioxide corrosion inhibitor, which comprises, by mass, 5 parts of polyetheramine, 2 parts of benzoic acid, 1 part of sodium dodecyl sulfate and 0.5 parts of sodium silicate.

[0020] Example 2 The preparation method of high-performance carbon dioxide corrosion inhibitor, the specific steps are as follows: Step 1: Weigh 6 parts of polyetheramine, 3 parts of benzoic acid, 1.5 parts of sodium lauryl sulfate and 0.8 parts of sodium silicate, respectively, by mass, mix and stir evenly to obtain a mixture; Step 2: heating the mixture obtained in step 1 to 90° C. and maintaining the temperature for 3 hours to obtain a reaction product; Step 3: Cool the reaction product obtained in step 2 to room temperature to obtain a high-performance carbon dioxide corrosion inhibitor, which comprises, by mass, 6 parts of polyetheramine, 3 parts of benzoic acid, 1.5 parts of sodium dodecyl sulfate and 0.8 parts of sodium silicate.

[0021] Example 3 The preparation method of high-performance carbon dioxide corrosion inhibitor, the specific steps are as follows: Step 1: Weigh 5.5 parts of polyetheramine, 2.5 parts of benzoic acid, 1.2 parts of sodium lauryl sulfate and 0.6 parts of sodium silicate, respectively, by mass, mix and stir evenly to obtain a mixture; Step 2: heating the mixture obtained in step 1 to 85° C. and maintaining the temperature for 2.5 hours to obtain a reaction product; Step 3: Cool the reaction product obtained in step 2 to room temperature to obtain a high-performance carbon dioxide corrosion inhibitor, which comprises, by mass, 5.5 parts of polyetheramine, 2.5 parts of benzoic acid, 1.2 parts of sodium dodecyl sulfate and 0.6 parts of sodium silicate.

[0022] Example 4 Polyetheramine, benzoic acid, sodium dodecyl sulfate and sodium silicate were mixed in a mass ratio of 5:2:1:0.5 and stirred evenly. The mixture was heated to 80°C and maintained for 2 hours to allow the components to fully react. The reaction product was cooled to room temperature to obtain a high-performance carbon dioxide corrosion inhibitor.

[0023] Example 5 Polyetheramine, citric acid, hexadecyltrimethylammonium bromide and potassium silicate were mixed in a mass ratio of 6:3:1.5:0.8 and stirred evenly. The mixture was heated to 90°C and maintained for 3 hours to allow the components to fully react. The reaction product was cooled to room temperature to obtain a high-performance carbon dioxide corrosion inhibitor.

[0024] Example 6 Polyetheramine, citric acid, hexadecyltrimethylammonium bromide and potassium silicate were mixed in a mass ratio of 5.5:2.5:1.2:0.6 and stirred evenly. The mixture was heated to 85°C and maintained for 2.5 hours to allow the components to fully react. The reaction product was cooled to room temperature to obtain a high-performance carbon dioxide corrosion inhibitor.

[0025] Comparative Example 1 like Figure 1 As shown, the high-performance carbon dioxide corrosion inhibitor obtained as in Example 1 was applied to four materials: N80, N80S, P110 and P110S, and the corrosion rates were measured at 60°C, 90°C and 120°C and a CO2 partial pressure of 1 MPa.

[0026] like Figure 2 As shown, for the above four materials, the high-performance carbon dioxide corrosion inhibitor obtained as in Example 1 was used, and the surfaces of the coupons of each material were obtained at 60°C, 90°C and 120°C and a CO2 partial pressure of 1 MPa, wherein the first row is the morphology of each coupon before de-filming, and the second row is the morphology of each coupon after de-filming.

[0027] like Figure 3 As shown, for four materials: N80, N80S, P110 and P110S, without using the high-performance carbon dioxide corrosion inhibitor of the present invention, at 60°C, 90°C and 120°C, 1MPa CO 2 Corrosion rate under partial pressure conditions.

[0028] like Figure 4As shown, without using the high-performance carbon dioxide corrosion inhibitor of the present invention, for the above four materials, at 60°C, 90°C and 120°C, 1MPa CO 2 The surfaces of the coupons of various materials obtained under partial pressure conditions, where the first row shows the morphology of the coupons before de-membrane removal, and the second row shows the morphology of the coupons after de-membrane removal.

[0029] Depend on Figure 1 and Figure 3 By comparison, it can be seen that for the above four materials, after adopting the high-performance carbon dioxide corrosion inhibitor of the present invention, the corrosion rate of each material at the corresponding temperature is significantly reduced, and the slow-release effect is greatly improved.

[0030] Depend on Figure 2 and Figure 4 The comparison shows that the corrosion degree of the surface of each material without the high-performance carbon dioxide corrosion inhibitor of the present invention is significantly higher than that of the corresponding surface of each material with the high-performance carbon dioxide corrosion inhibitor of the present invention. The corrosion inhibitor has the characteristics of temperature resistance, salt resistance, and dense protective film formation, and has a significant corrosion inhibition effect on carbon dioxide corrosion in oilfield water systems at high temperatures (150-250°C).

Claims

1. High performance carbon dioxide corrosion inhibitor, characterized in that: Calculated by mass, it includes 5-6 parts of polyether amine, 2-3 parts of organic acid, 1-1.5 parts of surfactant, and 0.5-0.8 parts of auxiliary agent.

2. The high performance carbon dioxide corrosion inhibitor according to claim 1, characterized in that: The organic acid is benzoic acid or citric acid.

3. The high performance carbon dioxide corrosion inhibitor according to claim 2, characterized in that: The surfactant is sodium dodecyl sulfate or hexadecyl trimethyl ammonium bromide.

4. The high performance carbon dioxide corrosion inhibitor according to claim 3, characterized in that: The auxiliary agent is sodium silicate or potassium silicate.

5. A method for preparing a high-performance carbon dioxide corrosion inhibitor, characterized in that: The specific steps are as follows: Step 1: Weigh 5-6 parts of polyetheramine, 2-3 parts of organic acid, 1-1.5 parts of surfactant and 0.5-0.8 parts of auxiliary agent respectively by mass, mix and stir evenly to obtain a mixture; Step 2: heating the mixture obtained in step 1 to 80-90° C. and maintaining the temperature for 2-3 hours to obtain a reaction product; Step 3: Cool the reaction product obtained in step 2 to room temperature to obtain a high-performance carbon dioxide corrosion inhibitor, which comprises, by mass, 5 to 6 parts of polyether amine, 2 to 3 parts of organic acid, 1 to 1.5 parts of surfactant, and 0.5 to 0.8 parts of additive.

6. The use of the high-performance carbon dioxide corrosion inhibitor according to claim 1, characterized in that: Used for surface corrosion inhibition of metal equipment in oil and gas fields.

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