Corrosion inhibition foam scrubbing agent as well as preparation method and application thereof

Abstract

The invention provides a corrosion inhibition foam scrubbing agent and a preparation method and application thereof.The corrosion inhibition foam scrubbing agent comprises a foaming agent, an auxiliary foaming agent, a corrosion inhibitor, an auxiliary corrosion inhibitor and water, and the corrosion inhibition foam scrubbing agent is prepared by compounding the foaming agent, the auxiliary foaming agent, the corrosion inhibitor, the auxiliary corrosion inhibitor and other components and has salt resistance, foam scrubbing and corrosion inhibition performance.

Description

Technical Field

[0001] The invention belongs to the technical field of foaming agents, and in particular relates to a corrosion-inhibiting foaming agent and a preparation method and application thereof. Background Art

[0002] As the development of gas reservoirs continues, the pressure and production of gas wells gradually decrease, the liquid carrying capacity of the gas wells decreases, and liquid accumulation is common. As the development time of Changqing Gas Field increases, water production in gas wells is now very common. Foam drainage gas production has become one of the important measures to remove liquid accumulation in gas wells and increase gas well production in the gas field due to its simple equipment, convenient operation and low cost. Foam drainage gas production mainly uses the addition of foaming agents for drainage.

[0003] CN106590573A discloses a foaming agent composition for salt-resistant drainage and gas production, and a preparation method and application thereof. The foaming agent composition for salt-resistant drainage and gas production comprises the following components, calculated by molar fractions: 1 part of a long-chain polyether nitrogen-containing compound and 0.5-20 parts of a petroleum sulfonate; the long-chain polyether nitrogen-containing compound has the following molecular formula:

[0004]

[0005] Among them, R1 is a C8-C30 fatty group; y is the sum of PO segments, y=0-20; z is the sum of EO segments, z=0-60; R2 is a C1-C4 alkylene group; R3 and R4 are any one of a C1-C5 alkyl group and a substituted alkyl group. The foaming height of the salt-resistant drainage and gas production foaming agent composition provided by the technical solution is greater than 200 mm, and the liquid carrying capacity is greater than 140 mL, and it can be used for drainage and gas production in high-salt gas fields.

[0006] CN113736440A discloses a production-increasing and defoaming agent, and a preparation method and application thereof. The production-increasing and defoaming agent comprises a first row of foam rods and a second row of foam rods; the first row of foam rods comprises ammonium salt; the second row of foam rods comprises nitrite. The production-increasing and defoaming agent provided by this technical solution can play a strong role in removing blockages and defoaming.

[0007] For the ancient gas reservoir in Jingbian, the average mineralization of formation water is as high as 127.8g / L. Natural gas contains a certain amount of CO2 and H2S acidic gases. The pH value of gas well water is low, showing weak acidity and high mineralization. Therefore, gas well corrosion has gradually intensified, becoming the main problem that plagues foam drainage. Both the foam drainage agent and the corrosion inhibitor are single-performance agents. The addition process is cumbersome and the construction cost is high. At the same time, the compatibility of the two is poor. Even if they are alternately added, the effects of corrosion inhibition and foam drainage will still be greatly affected.

[0008] CN116410725A discloses a corrosion-inhibiting foaming agent for gas fields, which is 1-(2-aminoethyl)-1-(carboxymethyl)-2-dodecyl-4,5-dihydro-1H-imidazole-1-ammonium chloride. The corrosion-inhibiting foaming agent for gas fields provided by the technical solution has strong foaming and stabilizing ability, an initial foaming height of 130 mm, a 5-min foaming height of 90 mm, a liquid carrying rate of 60%, and good corrosion inhibition function. The corrosion inhibition rate measured in a simulated gas well environment is more than 80%, but the foaming and corrosion inhibition performances still need to be further improved.

[0009] Therefore, it is necessary to develop a corrosion inhibitor with salt resistance to meet the needs of achieving foaming and corrosion inhibition under high mineralization. Summary of the invention

[0010] In view of the shortcomings of the prior art, the present invention aims to provide a corrosion-inhibiting foaming agent and its preparation method and application. The corrosion-inhibiting foaming agent is prepared by compounding components such as a foaming agent, an auxiliary foaming agent, a corrosion inhibitor, and an auxiliary corrosion inhibitor, and has salt resistance, foaming and corrosion inhibition properties.

[0011] To achieve this object, the present invention adopts the following technical solutions:

[0012] In a first aspect, the present invention provides a corrosion-inhibiting foaming agent, which comprises a foaming agent, an auxiliary foaming agent, a corrosion inhibitor, an auxiliary corrosion inhibitor and water.

[0013] In the present invention, the corrosion-inhibiting foaming agent is prepared by compounding components such as a foaming agent, an auxiliary foaming agent, a corrosion inhibitor, and an auxiliary corrosion inhibitor, and has the salt resistance, foaming and corrosion inhibition properties.

[0014] Preferably, based on the total mass of the corrosion inhibition foaming agent as 100%, the corrosion inhibition foaming agent includes the following components by mass percentage: 0.25-0.3% of a foaming agent (for example, 0.255%, 0.26%, 0.265%, 0.27%, 0.275%, 0.28%, 0.285%, 0.29% or 0.295%), 0.05-0.1% of a foaming aid (for example, 0.055%, 0.06%, 0.065%, 0.07%, 0.075%, 0.08%, 0.085%, 0.09% or 0.095%, etc.), corrosion inhibitor 0.005-0.01% (for example, 0.0055%, 0.006%, 0.0065%, 0.007%, 0.0075%, 0.008%, 0.0085%, 0.009% or 0.0095%, etc.), auxiliary corrosion inhibitor 0.001-0.005% (for example, 0.0015%, 0.002%, 0.0025%, 0.003%, 0.0035%, 0.004% or 0.0045%, etc.), and the balance is water.

[0015] Preferably, the foaming agent comprises phosphobetaine.

[0016] Preferably, the foaming agent comprises tetradecyl dimethyl hydroxypropyl betaine phosphate and dodecyl dimethyl hydroxypropyl betaine phosphate.

[0017] In the present invention, the tetradecyl dimethyl hydroxypropyl betaine phosphate and the dodecyl dimethyl hydroxypropyl betaine phosphate both have the characteristics of low surface tension and excellent foaming performance, and have good resistance to high mineralization.

[0018] Preferably, the mass ratio of tetradecyl dimethyl hydroxypropyl betaine phosphate to dodecyl dimethyl hydroxypropyl betaine phosphate is 1:0.65-1.5, such as 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3 or 1:1.4, and more preferably 1:0.75-1.25.

[0019] Preferably, the auxiliary foaming agent comprises petroleum sulfonate.

[0020] In the present invention, the petroleum sulfonate has the characteristics of low surface tension and good foaming performance.

[0021] Preferably, the petroleum sulfonate includes petroleum sulfonate prepared from crude oil fractions and petroleum sulfonate prepared from residual oil fractions.

[0022] In the present invention, the petroleum sulfonate prepared from the crude oil fraction and the petroleum sulfonate prepared from the residual oil fraction have good synergistic and complementary effects in performance. The petroleum sulfonate includes the petroleum sulfonate prepared from the crude oil fraction and the petroleum sulfonate prepared from the residual oil fraction, which has a better effect of reducing surface tension.

[0023] Preferably, the mass ratio of the petroleum sulfonate obtained from the crude oil fraction to the petroleum sulfonate obtained from the residual oil fraction is 3:0.5-1.5, for example, 3:0.6, 3:0.7, 3:0.8, 3:0.9, 3:1.0, 3:1.1, 3:1.2, 3:1.3 or 3:1.4.

[0024] Preferably, the corrosion inhibitor comprises an organic phosphonic acid.

[0025] Preferably, the corrosion inhibitor comprises 2-phosphonobutane-1,2,4-tricarboxylic acid.

[0026] In the present invention, the 2-phosphonobutane-1,2,4-tricarboxylic acid has a low phosphorus content and has the structural characteristics of phosphonic acid and carboxylic acid, so that it has good corrosion inhibition and scale inhibition performance, which is better than commonly used organic phosphonic acid, especially at high temperature. The corrosion inhibition and scale inhibition performance is far better than the commonly used organic phosphonic acid, and the synergy with other components is good.

[0027] Preferably, the auxiliary corrosion inhibitor comprises fatty acid imidazoline polyether phosphate and imidazoline oleyl polyamine.

[0028] In the present invention, the fatty acid imidazoline polyether phosphate is easily soluble in water and can be adsorbed on the metal surface to inhibit corrosion; the imidazoline oleoyl polyamine has good water solubility, and the reason for its corrosion inhibition is that the lone pair of electrons of the nitrogen atom and the empty orbit of the metal ion form a coordination bond to produce adsorption, forming a hydrophobic protective film on the metal surface, blocking the contact path between the corrosive medium and the metal, thereby achieving the purpose of reducing corrosion, and the imidazoline oleoyl polyamine has stable performance, good heat resistance, a wide range of applications, and low price, and is environmentally friendly. The fatty acid imidazoline polyether phosphate and imidazoline oleoyl polyamine have good composite synergy.

[0029] Preferably, the mass ratio of the fatty acid imidazoline polyether phosphate to the imidazoline oleyl polyamine is 1-2:1, for example, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1 or 1.9:1, etc.

[0030] Preferably, the water comprises distilled water.

[0031] In a second aspect, the present invention provides a method for preparing the corrosion-inhibiting foaming agent as described in the first aspect, the preparation method comprising the following steps: mixing a foaming agent, an auxiliary foaming agent, a corrosion inhibitor, an auxiliary corrosion inhibitor and water to obtain the corrosion-inhibiting foaming agent.

[0032] Preferably, the mixing temperature is 35-40°C, for example, 35.5°C, 36°C, 36.5°C, 37°C, 37.5°C, 38°C, 38.5°C, 39°C or 39.5°C, etc.

[0033] Preferably, the specific steps of mixing include: adding a foaming agent to the water and stirring for 10-15min (for example, 10.5min, 11min, 11.5min, 12min, 12.5min, 13min, 13.5min, 14min or 14.5min, etc.), adding an auxiliary foaming agent and stirring for 10-15min (for example, 10.5min, 11min, 11.5min, 12min, 12.5min, 13min, 13.5min, 14min or 14.5min, etc.), adding a corrosion inhibitor and stirring for 10-15min (for example, 10.5min, 11min, 11.5min, 12min, 12.5min, 13min, 13.5min, 14min or 14.5min, etc.), adding an auxiliary corrosion inhibitor and stirring for 30-40min, for example, 31min, 32min, 33min, 34min, 35min, 36min, 37min, 38min or 39min, etc.

[0034] In a third aspect, the present invention provides a use of the corrosion-inhibiting foaming agent as described in the first aspect in water drainage and gas production in water-producing gas wells.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] In the present invention, the corrosion-inhibiting foaming agent is prepared by compounding components such as a foaming agent, an auxiliary foaming agent, a corrosion inhibitor, and an auxiliary corrosion inhibitor. It integrates salt resistance, foaming and corrosion inhibition functions, overcomes the problems of single performance of existing foaming agents and corrosion inhibitors, complex filling process and high construction cost, and at the same time, improves the salt resistance of the foaming agent. The corrosion-inhibiting foaming agent can achieve the dual functions of foam drainage and prevention of wellbore corrosion at the same time when filled on site once. The filling process is simple and the construction cost is low. The initial foam height of the corrosion-inhibiting foaming agent is 120-142mm, the 5min foam height is 122-150mm, and the 15min liquid carrying capacity is 148-180mL. Preferably, the corrosion inhibition rate of the corrosion-inhibiting foaming agent is ≥90%, and both the foaming performance and the corrosion inhibition performance can meet the relevant index requirements. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0038] The sources of some components in the embodiments and comparative examples are as follows:

[0039] Petroleum sulfonates made from crude oil fractions: sourced from Daqing Xuanlong Chemical Co., Ltd.

[0040] Petroleum sulfonates made from residual oil fractions: sourced from Daqing Xuanlong Chemical Co., Ltd., brand name OCS.

[0041] 2-Phosphonobutane-1,2,4-tricarboxylic acid: Sourced from Shandong Fumaisi New Materials Co., Ltd.

[0042] Fatty acid imidazoline polyether phosphate: sourced from Dongying Baiyang Petroleum Technology Co., Ltd.

[0043] Imidazoline oleoyl polyamine: from Lanzhou Fine Chemical High-tech Development Company.

[0044] Example 1

[0045] The present embodiment provides a corrosion inhibitor foaming agent and a preparation method thereof. Taking the total mass of the corrosion inhibitor foaming agent as 100%, the corrosion inhibitor foaming agent includes the following components by mass percentage: 0.25% foaming agent, 0.1% auxiliary foaming agent, 0.005% corrosion inhibitor, 0.005% auxiliary corrosion inhibitor, and the balance is distilled water.

[0046] The foaming agent consists of tetradecyl dimethyl hydroxypropyl betaine phosphate and dodecyl dimethyl hydroxypropyl betaine phosphate in a mass ratio of 1:1.

[0047] The foaming aid is composed of petroleum sulfonate prepared from crude oil fraction and petroleum sulfonate prepared from residual oil fraction in a mass ratio of 3:1.

[0048] The corrosion inhibitor is 2-phosphonobutane-1,2,4-tricarboxylic acid.

[0049] The auxiliary corrosion inhibitor consists of fatty acid imidazoline polyether phosphate and imidazoline oleyl polyamine in a mass ratio of 1.5:1.

[0050] The preparation method of the corrosion inhibition foaming agent is as follows:

[0051] Add distilled water into the reaction kettle and heat it to 35° C., add a foaming agent and stir for 10 minutes, add an auxiliary foaming agent and stir for 10 minutes, add a corrosion inhibitor and stir for 10 minutes, add an auxiliary corrosion inhibitor and continue stirring for 30 minutes to obtain the corrosion inhibitor foaming agent.

[0052] Example 2

[0053] The present embodiment provides a corrosion inhibitor foaming agent and a preparation method thereof. Taking the total mass of the corrosion inhibitor foaming agent as 100%, the corrosion inhibitor foaming agent includes the following components by mass percentage: 0.27% foaming agent, 0.08% auxiliary foaming agent, 0.008% corrosion inhibitor, 0.003% auxiliary corrosion inhibitor, and the balance is distilled water.

[0054] The foaming agent consists of tetradecyl dimethyl hydroxypropyl betaine phosphate and dodecyl dimethyl hydroxypropyl betaine phosphate in a mass ratio of 1:0.75.

[0055] The foaming agent is composed of petroleum sulfonate prepared from crude oil fraction and petroleum sulfonate prepared from residual oil fraction in a mass ratio of 3:0.65.

[0056] The corrosion inhibitor is 2-phosphonobutane-1,2,4-tricarboxylic acid.

[0057] The auxiliary corrosion inhibitor consists of fatty acid imidazoline polyether phosphate and imidazoline oleyl polyamine in a mass ratio of 1:1.

[0058] The preparation method of the corrosion inhibition foaming agent is as follows:

[0059] Add distilled water into the reaction kettle and heat it to 40° C., add a foaming agent and stir for 15 minutes, add an auxiliary foaming agent and stir for 15 minutes, add a corrosion inhibitor and stir for 15 minutes, add an auxiliary corrosion inhibitor and continue stirring for 30 minutes to obtain the corrosion inhibitor foaming agent.

[0060] Example 3

[0061] The present embodiment provides a corrosion-inhibiting foaming agent and a preparation method thereof. The corrosion-inhibiting foaming agent comprises the following components by mass percentage: 0.3% foaming agent, 0.05% auxiliary foaming agent, 0.005% corrosion inhibitor, 0.005% auxiliary corrosion inhibitor, and the balance is distilled water.

[0062] The foaming agent consists of tetradecyl dimethyl hydroxypropyl betaine phosphate and dodecyl dimethyl hydroxypropyl betaine phosphate in a mass ratio of 1:1.25.

[0063] The foaming agent is composed of petroleum sulfonate prepared from crude oil fraction and petroleum sulfonate prepared from residual oil fraction in a mass ratio of 3:0.75.

[0064] The corrosion inhibitor is 2-phosphonobutane-1,2,4-tricarboxylic acid.

[0065] The auxiliary corrosion inhibitor consists of fatty acid imidazoline polyether phosphate and imidazoline oleyl polyamine in a mass ratio of 2:1.

[0066] The preparation method of the corrosion inhibition foaming agent is as follows:

[0067] Add distilled water into the reaction kettle and heat it to 38° C., add a foaming agent and stir for 13 minutes, add an auxiliary foaming agent and stir for 13 minutes, add a corrosion inhibitor and stir for 13 minutes, add an auxiliary corrosion inhibitor and continue stirring for 30 minutes to obtain the corrosion inhibitor foaming agent.

[0068] Example 4

[0069] This embodiment provides a corrosion inhibitor and a preparation method thereof, which is different from Embodiment 1 only in that the mass percentage of the corrosion inhibitor is adjusted to 0.01%, the mass percentage of the auxiliary corrosion inhibitor is adjusted to 0.001%, and the rest is the same as Embodiment 1.

[0070] Example 5

[0071] This embodiment provides a corrosion-inhibiting foaming agent and a preparation method thereof, which is different from Embodiment 1 only in that the mass percentage of the foaming agent is adjusted to 0.3%, and the mass percentage of the auxiliary foaming agent is adjusted to 0.05%, and the rest is the same as Embodiment 1.

[0072] Example 6

[0073] This embodiment provides a corrosion inhibitor and a preparation method thereof, which is different from Embodiment 1 only in that the mass ratio of tetradecyl dimethyl hydroxypropyl betaine phosphate and dodecyl dimethyl hydroxypropyl betaine phosphate is adjusted to 1:1.5, and the rest is the same as Embodiment 1.

[0074] Example 7

[0075] This embodiment provides a corrosion inhibitor and a preparation method thereof, which is different from Embodiment 1 only in that the mass ratio of tetradecyl dimethyl hydroxypropyl betaine phosphate and dodecyl dimethyl hydroxypropyl betaine phosphate is adjusted to 1:0.65, and the rest is the same as Embodiment 1.

[0076] Example 8

[0077] This embodiment provides a corrosion inhibition foaming agent and a preparation method thereof, which is different from Embodiment 1 only in that the mass percentage of the foaming agent is adjusted to 0.2%, and the rest is the same as Embodiment 1.

[0078] Example 9

[0079] This embodiment provides a corrosion inhibition foaming agent and a preparation method thereof, which is different from Embodiment 1 only in that the mass percentage of the foaming agent is adjusted to 0.4%, and the rest is the same as Embodiment 1.

[0080] Example 10

[0081] This embodiment provides a corrosion inhibitor and a preparation method thereof, which is different from Example 1 only in that, under the premise of keeping the mass percentage of the auxiliary corrosion inhibitor unchanged, the fatty acid imidazoline polyether phosphate and imidazoline oleyl polyamine with a mass ratio of 1.5:1 are all replaced by fatty acid imidazoline polyether phosphate, and the rest is the same as Example 1.

[0082] Embodiment 11

[0083] This embodiment provides a corrosion inhibitor and a preparation method thereof, which is different from Example 1 only in that, under the premise of keeping the mass percentage of the auxiliary corrosion inhibitor unchanged, the fatty acid imidazoline polyether phosphate and imidazoline oleyl polyamine with a mass ratio of 1.5:1 are all replaced by imidazoline oleyl polyamine, and the rest is the same as Example 1.

[0084] Comparative Example 1

[0085] This comparative example provides a corrosion inhibitor and a preparation method thereof, which is different from Example 1 only in that no corrosion inhibitor and auxiliary corrosion inhibitor are added, the mass percentage of distilled water is 99.65%, and the rest is the same as Example 1.

[0086] Comparative Example 2

[0087] This comparative example provides a corrosion-inhibiting foaming agent and a preparation method thereof, which is different from Example 1 only in that no auxiliary corrosion inhibitor is added, the mass percentage of the corrosion inhibitor is adjusted to 0.01%, and the rest is the same as Example 1.

[0088] Comparative Example 3

[0089] This comparative example provides a corrosion-inhibiting foaming agent and a preparation method thereof, which is different from Example 1 only in that no foaming agent is added, the mass percentage of the foaming agent is adjusted to 0.35%, and the rest is the same as Example 1.

[0090] The corrosion inhibitors and foaming agents provided in the examples and comparative examples were subjected to the following performance tests.

[0091] (1) Foam performance test: According to Q / SY 1815-2015 "Technical Specifications for Foaming Agents for Drainage and Gas Recovery", the Ross-Miles foam instrument was used for the experiment. The main experimental steps are as follows: Heat the circulating water bath and corrosion inhibitor foaming agent to 65°C, add 50mL corrosion inhibitor foaming agent to the bottom of the graduated measuring tube, and then add 200mL corrosion inhibitor foaming agent to the dropper; open the stopcock of the dropper until all the solution in the dropper flows out, and start timing at the same time, and record the height of the foam at 0, 5, 10, 20, 30, 40, 50, and 60 minutes, respectively, recorded as H n (n=0, 5, 10, 20, 30, 40, 50 or 60).

[0092] (2) Liquid carrying performance test: According to QS / Y 1815-2015 "Technical Specifications for Foaming Agents for Drainage and Gas Recovery", the foaming agent solution was prepared and transferred to the constructed liquid carrying capacity evaluation device. The liquid volume (total volume of oil and water) in the foam collector at 65°C after 15 minutes was used as the evaluation standard to evaluate the liquid carrying performance of the tested corrosion inhibition foaming agent.

[0093] (3) Corrosion inhibition performance test method: Q235 steel with a nominal size of 50 mm × 13 mm × 3 mm was selected as the corrosion test piece to simulate the field working conditions. The corrosion immersion test was carried out in accordance with the evaluation standard QS / Y 1815-2015 for foaming agents and the metal material laboratory uniform corrosion full immersion test method JB / T 7901-1999. The uniform corrosion inhibition rate was calculated according to the performance index and evaluation method of corrosion inhibitors for oil field produced water SY / T5273-2014. The calculation formula is as follows:

[0094]

[0095] In the formula: η1 represents the uniform corrosion inhibition rate, expressed in percentage; Δm0 represents the mass loss of the corrosion specimen in the blank experiment, g; Δm0 represents the mass loss of the corrosion specimen in the experiment with corrosion inhibitor, g.

[0096] The test results are shown in Table 1.

[0097] Table 1

[0098]

[0099] According to the test results in Table 1, the initial foam height of the corrosion-inhibiting foaming agent provided in Examples 1-11 is 120-142 mm, the 5-min foam height is 122-150 mm, the 15-min liquid carrying volume is 148-180 mL, and the corrosion inhibition rate is 82.13-92.13%. The corrosion-inhibiting foaming agents provided in Examples 1-9 all meet the foaming and foam stabilization index requirements of Q / SY 1815-2015, and the corrosion inhibition rates are all above 90%.

[0100] Compared with Example 1, if the mass ratio of tetradecyl dimethyl hydroxypropyl phosphate betaine and dodecyl dimethyl hydroxypropyl phosphate betaine is smaller (Example 6), the initial foam height and the 5min foam height decrease, the 15min liquid carrying amount decreases, and the corrosion inhibition rate decreases slightly; if the mass ratio of tetradecyl dimethyl hydroxypropyl phosphate betaine and dodecyl dimethyl hydroxypropyl phosphate betaine is larger (Example 7), the initial foam height and the 5min foam height decrease, the 15min liquid carrying amount decreases, and the corrosion inhibition rate decreases slightly, proving that the corrosion inhibition foaming agent prepared by using a specific mass ratio of tetradecyl dimethyl hydroxypropyl phosphate betaine and dodecyl dimethyl hydroxypropyl phosphate betaine has better performance.

[0101] Compared with Example 1, if the mass percentage of the foaming agent is too low (Example 8), the initial foaming height and the 5-minute foam height decrease significantly, the 15-minute liquid carrying capacity decreases significantly, and the corrosion inhibition rate decreases slightly; if the mass percentage of the foaming agent is too high (Example 9), the performance is similar to that of Example 1, and the foaming, foam stabilization and liquid carrying properties are not greatly affected, but the mass percentage of the foaming agent is too high, which is not conducive to reducing the production cost; It is proved that the corrosion inhibition foaming agent prepared by using a foaming agent in a specific mass percentage range has better performance and lower production cost.

[0102] Compared with Example 1, if only fatty acid imidazoline polyether phosphate is used as an auxiliary corrosion inhibitor (Example 10), the foaming, foam stabilization and liquid carrying performance are slightly affected, but the corrosion inhibition rate decreases, and the corrosion inhibition effect of the corrosion inhibition foaming agent decreases significantly; if only imidazoline oleyl polyamine is used as an auxiliary corrosion inhibitor (Example 11), the corrosion inhibition rate decreases, and the corrosion inhibition effect of the corrosion inhibition foaming agent system decreases significantly, which proves that the corrosion inhibition foaming agent prepared by compounding fatty acid imidazoline polyether phosphate and imidazoline oleyl polyamine has better corrosion inhibition performance.

[0103] Compared with Example 1, it can be seen that if the corrosion inhibitor and the auxiliary corrosion inhibitor are not added (Comparative Example 1), the corrosion inhibition rate of the system is only 72.55%, which cannot meet the actual use requirements of the gas well site.

[0104] Compared with Example 1, it can be seen that if the auxiliary corrosion inhibitor is not added (Comparative Example 2), the corrosion inhibition rate of the system only reaches 84.06%, which is poorer than that of Example 1.

[0105] Compared with Example 1, it can be seen that if no foaming agent is added (Comparative Example 3), the initial foaming height and the 5-minute foam height are significantly reduced, and the 15-minute liquid carrying capacity is significantly reduced.

[0106] The applicant declares that the present invention uses the above-mentioned embodiments to illustrate a corrosion inhibitor and its preparation method and application, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A corrosion inhibitor foaming agent, characterized in that: The corrosion-inhibiting foaming agent comprises a foaming agent, an auxiliary foaming agent, a corrosion inhibitor, an auxiliary corrosion inhibitor and water.

2. The corrosion inhibition foaming agent according to claim 1, characterized in that: Taking the total mass of the corrosion inhibitor foaming agent as 100%, the corrosion inhibitor foaming agent includes the following components by mass percentage: 0.25-0.3% of foaming agent, 0.05-0.1% of auxiliary foaming agent, 0.005-0.01% of corrosion inhibitor, 0.001-0.005% of auxiliary corrosion inhibitor, and the balance is water.

3. The corrosion inhibition foaming agent according to claim 1 or 2, characterized in that: The foaming agent includes phosphate betaine; Preferably, the foaming agent comprises tetradecyl dimethyl hydroxypropyl betaine phosphate and dodecyl dimethyl hydroxypropyl betaine phosphate; Preferably, the mass ratio of tetradecyl dimethyl hydroxypropyl betaine phosphate to dodecyl dimethyl hydroxypropyl betaine phosphate is 1:0.65-1.5, and more preferably 1:0.75-1.

25.

4. The corrosion inhibition foaming agent according to any one of claims 1 to 3, characterized in that: The auxiliary foaming agent includes petroleum sulfonate; Preferably, the petroleum sulfonate includes petroleum sulfonate prepared from crude oil fractions and petroleum sulfonate prepared from residual oil fractions; Preferably, the mass ratio of the petroleum sulfonate prepared from the crude oil fraction to the petroleum sulfonate prepared from the residual oil fraction is 3:0.5-1.

5.

5. The corrosion inhibition foaming agent according to any one of claims 1 to 4, characterized in that: The corrosion inhibitor includes an organic phosphonic acid; Preferably, the corrosion inhibitor comprises 2-phosphonobutane-1,2,4-tricarboxylic acid.

6. The corrosion inhibition foaming agent according to any one of claims 1 to 5, characterized in that: The auxiliary corrosion inhibitor includes fatty acid imidazoline polyether phosphate and imidazoline oleyl polyamine; Preferably, the mass ratio of the fatty acid imidazoline polyether phosphate to the imidazoline oleyl polyamine is 1-2:

1.

7. The corrosion inhibition foaming agent according to any one of claims 1 to 6, characterized in that: The water includes distilled water.

8. A method for preparing the corrosion inhibition foaming agent according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: mixing a foaming agent, an auxiliary foaming agent, a corrosion inhibitor, an auxiliary corrosion inhibitor and water to obtain the corrosion-inhibiting foaming agent.

9. The preparation method according to claim 8, characterized in that: The mixing temperature is 35-40°C; Preferably, the specific steps of mixing include: adding a foaming agent to water and stirring for 10-15 minutes, adding an auxiliary foaming agent and stirring for 10-15 minutes, adding a corrosion inhibitor and stirring for 10-15 minutes, and adding an auxiliary corrosion inhibitor and stirring for 30-40 minutes.

10. Use of the corrosion inhibition foaming agent according to any one of claims 1 to 7 in water drainage and gas production in water-producing gas wells.

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