A gas well reservoir plug remover, a preparation method and application thereof

Abstract

The application provides a gas well reservoir plugging remover, a preparation method and application thereof, and relates to the technical field of gas well reservoir plugging. The gas well reservoir plugging remover comprises the following components in parts by mass: a main agent 20-30 parts, a solubilizing agent 1-2 parts, a dispersing agent 2-5 parts, a scale inhibitor 0.5-1 part, a penetrating agent 0.5-2 parts, sodium lauroyl glutamate 2-5 parts, polyvinyl alcohol 6-10 parts and water 50-70 parts, and the main agent is a mixture of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether and dimethylformamide. The gas well reservoir plugging remover provided by the application can destroy the molecular structure, the three-dimensional network structure of polymer and polymer gel of the stratum deposit, reduce the liquid flow resistance, improve the stratum permeability and increase the seepage capacity of the gas well, so that the production time of the gas well is prolonged, the yield of the gas well is improved, and the reservoir has a wetting effect.

Description

Technical Field

[0001] This invention relates to the field of gas well reservoir unblocking technology, and in particular to a gas well reservoir unblocking agent, its preparation method, and its application. Background Technology

[0002] Gas well reservoir blockage mainly originates from two aspects: 1. Due to the small pore throats, high capillary pressure, and strong wettability of the aqueous phase in tight reservoirs, the liquid phase easily stagnates at these tiny throats, blocking the fluid in the subsequent pores, ultimately forming a water lock and significantly reducing the reservoir's flow capacity; 2. The extraction process causes solid particle migration, leading to gas well reservoir blockage. Gas well reservoir blockage reduces gas well productivity and may even halt production, thus requiring effective unblocking operations to restore normal gas well production. Currently, there are various methods and technologies for treating reservoir blockage in China, which can be summarized into four categories: chemical methods, physical methods, physicochemical methods, and microbiological methods. Among these, chemical unblocking has become the most commonly used unblocking method due to its advantages such as strong targeting, simple and flexible construction, relatively low operating costs, minimal damage to the well structure, high success rate, and effective duration of several months to one or two years.

[0003] Chemical unblocking methods utilize composite chemical unblocking agents, primarily composed of strong oxidants. The oxidants degrade cross-linked polymer aggregates, kill decomposing microorganisms and their metabolic products, and dissolve iron sulfide and clay minerals, breaking down large gel aggregates into smaller fragments and a solution, thus achieving the purpose of unblocking. While commercially available unblocking agents can solve gas well reservoir blockage problems and meet basic needs, further improving their unblocking capabilities and rates remains a research topic. Summary of the Invention

[0004] To address the issue of how to further improve the unblocking ability and rate of unblocking agents mentioned in the background art, the gas well reservoir unblocking agent provided by this invention reduces fluid flow resistance, improves formation permeability, and increases the seepage capacity of the ternary composite driving fluid between oil and water wells by destroying the molecular structure, polymer, and polymer gel three-dimensional network structure of formation scale. This achieves pressure reduction and injection enhancement, and also has a wetting effect on the soil layer.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a gas well reservoir unblocking agent, which, by mass parts, comprises: 20-30 parts of main active agent, 1-2 parts of solubilizer, 2-5 parts of dispersant, 0.5-1 part of scale inhibitor, 0.5-2 parts of penetrant, 2-5 parts of sodium lauroyl glutamate, 6-10 parts of polyvinyl alcohol and 50-70 parts of water; the main active agent is a mixture of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether and dimethylformamide.

[0006] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:1.5-2.5:1.5-2.

[0007] Preferably, the mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:2:1.5.

[0008] The solubilizer is one or both of polyethylene glycol or ethylene glycol.

[0009] The dispersant is a fatty amine dispersant.

[0010] The scale inhibitor is one or more of sodium gluconate, sodium alginate, and polyepoxysuccinic acid.

[0011] The penetrant is one or more of the following: tridecyl alcohol polyoxyethylene ether phosphate, 2-methyl-2,4-pentanediol, oleic acid diethanolamide, and polyoxyethylene polyoxypropylene propylene glycol ether.

[0012] The mass ratio of sodium lauroyl glutamate to polyvinyl alcohol is 1:2.

[0013] The preparation method of the above-mentioned gas well reservoir unblocking agent includes the following steps:

[0014] Step 1: Prepare materials. Weigh the main active ingredient, solubilizer, dispersant, scale inhibitor, penetrant, sodium lauroyl glutamate, polyvinyl alcohol, and water according to the mass ratio.

[0015] Step 2: Add water to the reaction vessel, heat to 40-60℃, add the main active agent and solubilizer, stir for 40-60 minutes, and control the temperature at 60-65℃; after cooling, add sodium lauroyl glutamate and polyvinyl alcohol, stir for 10-20 minutes, and control the temperature at 20-30℃; then add scale inhibitor and penetrant, stir for 30-40 minutes, and control the temperature at 20-30℃; finally, add dispersant, stir for 10-20 minutes, and control the temperature at 20-30℃ to obtain the gas well reservoir unblocking agent.

[0016] The application of the above-mentioned gas well reservoir unblocking agents in gas well development.

[0017] The beneficial effects of this invention are:

[0018] 1. The raw material components of the gas well reservoir unblocking agent of the present invention contain a main active agent, which includes ethylenediaminetetraacetic acid (EDTA), ethylene glycol monomethyl ether (EDME), and dimethylformamide (DMF). The main active agent can solve the problem of blockage caused by inorganic and organic blockages. On the one hand, EDTA has a strong complexing ability and can complex with metal ions in decomposed inorganic substances, converting them into an aqueous solution to solve the blockage problem. It can also capture iron ions in the corrosion product iron sulfide to form iron ion chelates, which dissolve in the aqueous solution to remove corrosion products in the blockage. On the other hand, EDME and DMF mainly dissolve organic blockages and, with the synergistic effect of the penetrant, quickly penetrate into the interior of the organic blockage, causing it to slowly dissolve and disperse. At the same time, the mutual solvent and suspending agent have excellent ability to dissolve organic compounds.

[0019] 2. The raw material components of the gas well reservoir unblocking agent of the present invention contain a dispersant, which is a fatty amine dispersant. It is used to synergistically disperse other components in the solution. In addition, the fatty amine dispersant has a bidirectional wetting function after being mixed with the solubilizer in the system. It can reduce the surface tension of the solution. During the unblocking process, it can penetrate deep into the pores through its permeation ability. By reducing the surface tension, changing the wettability of the rock, reducing or eliminating water lock, and reducing the residual water saturation, the unblocking effect is achieved.

[0020] 3. The raw material components of the gas well reservoir unblocking agent of the present invention include sodium lauroyl glutamate and polyvinyl alcohol. The sodium lauroyl glutamate and polyvinyl alcohol generate stable foam, which increases the effective area of ​​the main agent in the blocked area, removes organic and inorganic pollution from the formation, and can enhance acidizing efficiency and improve the utilization rate of the unblocking agent. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, 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.

[0022] The gas well reservoir unblocking agent of the present invention comprises, by mass parts: 20-30 parts of main active agent, 1-2 parts of solubilizer, 2-5 parts of dispersant, 0.5-1 part of scale inhibitor, 0.5-2 parts of penetrant, 2-5 parts of sodium lauroyl glutamate, 6-10 parts of polyvinyl alcohol, and 50-70 parts of water; the main active agent is a mixture of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide.

[0023] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:1.5-2.5:1.5-2.

[0024] Preferably, the mass ratio of the ethylenediaminetetraacetic acid, the ethylene glycol monomethyl ether, and the dimethylformamide is 1:2:1.5.

[0025] The solubilizer is one or both of polyethylene glycol or ethylene glycol.

[0026] The dispersant is a fatty amine dispersant.

[0027] The scale inhibitor is one or more of sodium gluconate, sodium alginate, and polyepoxysuccinic acid.

[0028] The penetrant is one or more of the following: tridecyl alcohol polyoxyethylene ether phosphate, 2-methyl-2,4-pentanediol, oleic acid diethanolamide, and polyoxyethylene polyoxypropylene propylene glycol ether.

[0029] The mass ratio of sodium lauroyl glutamate to polyvinyl alcohol is 1:2.

[0030] The preparation method of the above-mentioned gas well reservoir unblocking agent includes the following steps:

[0031] Step 1: Prepare materials. Weigh the main active ingredient, solubilizer, dispersant, scale inhibitor, penetrant, sodium lauroyl glutamate, polyvinyl alcohol, and water according to the mass ratio.

[0032] Step 2: Add water to the reaction vessel, heat to 40-60℃, add the main active agent and solubilizer, stir for 40-60 minutes, and control the temperature at 60-65℃; after cooling, add sodium lauroyl glutamate and polyvinyl alcohol, stir for 10-20 minutes, and control the temperature at 20-30℃; then add scale inhibitor and penetrant, stir for 30-40 minutes, and control the temperature at 20-30℃; finally, add dispersant, stir for 10-20 minutes, and control the temperature at 20-30℃ to obtain the gas well reservoir unblocking agent.

[0033] The above-mentioned gas well reservoir unblocking agent is applied in gas well production. The main process is as follows: the gas well reservoir unblocking agent is injected into the gas well tubing, nitrogen is used to push into the reservoir and the well is shut in for about 72 hours, and then the well is opened to drain the fluid for production; or the gas well reservoir unblocking agent is injected into the tubing and then shut in, and the agent is injected into the bottom layer by the gas well's own energy, and then the well is opened for production depending on the recovery of the oil casing pressure.

[0034] The following detailed description is provided with reference to specific embodiments:

[0035] The experimental reagents and materials used in Examples 1-3 and their comparative examples of this invention are described below:

[0036] Main active agents: ethylenediaminetetraacetic acid (EDTA), Shandong Jinyueyuan; ethylene glycol monomethyl ether (EDME), Jinan Yucai Chemical; dimethylformamide (DMF), Jinan Zhuoyue Chemical.

[0037] Solubilizer: Polyethylene glycol 400, Shandong Changyao New Materials;

[0038] Dispersant: Fatty amine polyoxyethylene ether, Hubei Dongcao Chemical;

[0039] Scale inhibitor: Polyepoxysuccinic acid, Shandong Changyao New Materials;

[0040] Penetrant: Oleic acid diethanolamide, Qingdao Shengbang Chemical Co., Ltd.

[0041] Sodium lauroyl glutamate: Shandong Polymer Chemicals;

[0042] Polyvinyl alcohol: Jinan Haotian Chemical Co., Ltd.

[0043] It should be noted that, where no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in this field or the product instructions shall be followed. If the manufacturers of the reagents or instruments used are not specified, they are all conventional products that can be obtained commercially.

[0044] Example 1

[0045] A gas well reservoir unblocking agent, by mass parts, comprises the following raw material components: 20 parts of main active agent, 1 part of polyethylene glycol 400, 5 parts of fatty amine polyoxyethylene ether, 1 part of polyepoxysuccinic acid, 2 parts of oleic acid diethanolamide, 5 parts of sodium lauroyl glutamate, 10 parts of polyvinyl alcohol, and 70 parts of water.

[0046] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:2:1.5.

[0047] The preparation method of the above-mentioned gas well reservoir unblocking agent is as follows: add water to the reaction vessel, heat to 60°C, add the main active agent and polyethylene glycol 400, stir for 40 minutes, and control the temperature at 60°C; after cooling, add sodium lauroyl glutamate and polyvinyl alcohol, stir for 10 minutes, and control the temperature at 30°C; then add polyepoxysuccinic acid and oleic acid diethanolamide, stir for 30 minutes, and control the temperature at 20°C; finally, add fatty amine polyoxyethylene ether, stir for 10 minutes, and control the temperature at 20°C to obtain the gas well reservoir unblocking agent.

[0048] Example 2

[0049] A gas well reservoir unblocking agent, by mass parts, comprises the following raw material components: 30 parts of main active agent, 2 parts of polyethylene glycol 400, 2 parts of fatty amine polyoxyethylene ether, 1 part of polyepoxysuccinic acid, 2 parts of oleic acid diethanolamide, 5 parts of sodium lauroyl glutamate, 10 parts of polyvinyl alcohol, and 70 parts of water.

[0050] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:1.5:2.

[0051] The preparation method of the above-mentioned gas well reservoir unblocking agent is as follows: water is added to the reaction vessel, the temperature is raised to 40°C, the main active agent and polyethylene glycol 400 are added, and the mixture is stirred for 60 minutes while maintaining the temperature at 65°C; after cooling, sodium lauroyl glutamate and polyvinyl alcohol are added, and the mixture is stirred for 20 minutes while maintaining the temperature at 20°C; then polyepoxysuccinic acid and oleic acid diethanolamide are added, and the mixture is stirred for 40 minutes while maintaining the temperature at 20°C; finally, fatty amine polyoxyethylene ether is added, and the mixture is stirred for 20 minutes while maintaining the temperature at 20°C, thus obtaining the gas well reservoir unblocking agent.

[0052] Example 3

[0053] A gas well reservoir unblocking agent, by mass parts, comprises the following raw material components: 30 parts of main active agent, 2 parts of polyethylene glycol 400, 5 parts of fatty amine polyoxyethylene ether, 0.5 parts of polyepoxysuccinic acid, 2 parts of oleic acid diethanolamide, 5 parts of sodium lauroyl glutamate, 10 parts of polyvinyl alcohol, and 70 parts of water.

[0054] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:2.5:1.5.

[0055] The preparation method of the above-mentioned gas well reservoir unblocking agent is as follows: add water to the reaction vessel, heat to 50°C, add the main active agent and polyethylene glycol 400, stir for 50 minutes, and control the temperature at 65°C; after cooling, add sodium lauroyl glutamate and polyvinyl alcohol, stir for 15 minutes, and control the temperature at 25°C; then add polyepoxysuccinic acid and oleic acid diethanolamide, stir for 30 minutes, and control the temperature at 25°C; finally, add fatty amine polyoxyethylene ether, stir for 10 minutes, and control the temperature at 20°C to obtain the gas well reservoir unblocking agent.

[0056] Example 4

[0057] A gas well reservoir unblocking agent, by mass parts, comprises the following raw material components: 30 parts of main active agent, 2 parts of polyethylene glycol 400, 5 parts of fatty amine polyoxyethylene ether, 1 part of polyepoxysuccinic acid, 0.5 parts of oleic acid diethanolamide, 5 parts of sodium lauroyl glutamate, 10 parts of polyvinyl alcohol, and 70 parts of water.

[0058] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:1.5:1.5.

[0059] The preparation method of the above-mentioned gas well reservoir unblocking agent is as follows: add water to the reaction vessel, heat to 50°C, add the main active agent and polyethylene glycol 400, stir for 50 minutes, and control the temperature at 65°C; after cooling, add sodium lauroyl glutamate and polyvinyl alcohol, stir for 15 minutes, and control the temperature at 25°C; then add polyepoxysuccinic acid and oleic acid diethanolamide, stir for 30 minutes, and control the temperature at 25°C; finally, add fatty amine polyoxyethylene ether, stir for 10 minutes, and control the temperature at 20°C to obtain the gas well reservoir unblocking agent.

[0060] Example 5

[0061] A gas well reservoir unblocking agent, by mass parts, comprises the following raw material components: 30 parts of main active agent, 2 parts of polyethylene glycol 400, 5 parts of fatty amine polyoxyethylene ether, 1 part of polyepoxysuccinic acid, 2 parts of oleic acid diethanolamide, 2 parts of sodium lauroyl glutamate, 6 parts of polyvinyl alcohol, and 50 parts of water.

[0062] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:2.5:1.5.

[0063] The preparation method of the above-mentioned gas well reservoir unblocking agent is as follows: add water to the reaction vessel, heat to 50°C, add the main active agent and polyethylene glycol 400, stir for 50 minutes, and control the temperature at 65°C; after cooling, add sodium lauroyl glutamate and polyvinyl alcohol, stir for 15 minutes, and control the temperature at 25°C; then add polyepoxysuccinic acid and oleic acid diethanolamide, stir for 30 minutes, and control the temperature at 25°C; finally, add fatty amine polyoxyethylene ether, stir for 10 minutes, and control the temperature at 20°C to obtain the gas well reservoir unblocking agent.

[0064] Comparative Example 1

[0065] A gas well reservoir unblocking agent, by mass, comprises the following raw material components: 30 parts of main active agent, 5 parts of fatty amine polyoxyethylene ether, 1 part of polyepoxysuccinic acid, 2 parts of oleic acid diethanolamide, 5 parts of sodium lauroyl glutamate, 6 parts of polyvinyl alcohol, and 50 parts of water.

[0066] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:2:1.5.

[0067] The preparation method of the above-mentioned gas well reservoir unblocking agent is as follows: add water to the reaction vessel, heat to 50°C, add the main active agent, stir for 50 minutes, and control the temperature at 65°C; after cooling, add sodium lauroyl glutamate and polyvinyl alcohol, stir for 15 minutes, and control the temperature at 25°C; then add polyepoxysuccinic acid and oleic acid diethanolamide, stir for 30 minutes, and control the temperature at 25°C; finally, add fatty amine polyoxyethylene ether, stir for 10 minutes, and control the temperature at 20°C to obtain the gas well reservoir unblocking agent.

[0068] Comparative Example 2

[0069] A high-efficiency gas well reservoir unblocking agent, by mass parts, comprises the following raw material components: 30 parts of main active agent, 2 parts of polyethylene glycol 400, 1 part of polyepoxysuccinic acid, 2 parts of oleic acid diethanolamide, 5 parts of sodium lauroyl glutamate, 6 parts of polyvinyl alcohol, and 50 parts of water.

[0070] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:2:1.5.

[0071] The preparation method of the above-mentioned gas well reservoir unblocking agent is as follows: add water to the reaction vessel, heat to 50°C, add the main active agent and polyethylene glycol 400, stir for 50 minutes, and control the temperature at 65°C; after cooling, add sodium lauroyl glutamate and polyvinyl alcohol, stir for 15 minutes, and control the temperature at 25°C; then add polyepoxysuccinic acid and oleic acid diethanolamide, stir for 30 minutes, and control the temperature at 25°C to obtain the gas well reservoir unblocking agent.

[0072] Comparative Example 3

[0073] A high-efficiency gas well reservoir unblocking agent, by mass parts, comprises the following raw material components: 30 parts of main active agent, 2 parts of polyethylene glycol 400, 5 parts of fatty amine polyoxyethylene ether, 1 part of polyepoxysuccinic acid, 2 parts of oleic acid diethanolamide, 6 parts of polyvinyl alcohol, and 50 parts of water.

[0074] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:2:1.5.

[0075] The preparation method of the above-mentioned gas well reservoir unblocking agent is as follows: add water to the reaction vessel, heat to 50°C, add the main active agent and polyethylene glycol 400, stir for 50 minutes, and control the temperature at 65°C; after cooling, add polyvinyl alcohol, stir for 15 minutes, and control the temperature at 25°C; then add polyepoxysuccinic acid and oleic acid diethanolamide, stir for 30 minutes, and control the temperature at 25°C; finally, add fatty amine polyoxyethylene ether, stir for 10 minutes, and control the temperature at 20°C to obtain the gas well reservoir unblocking agent.

[0076] Comparative Example 4

[0077] A high-efficiency gas well reservoir unblocking agent, by mass parts, comprises the following raw material components: 30 parts of main active agent, 2 parts of polyethylene glycol 400, 5 parts of fatty amine polyoxyethylene ether, 1 part of polyepoxysuccinic acid, 2 parts of oleic acid diethanolamide, 5 parts of sodium lauroyl glutamate, and 50 parts of water.

[0078] The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:2:1.5.

[0079] The preparation method of the above-mentioned gas well reservoir unblocking agent is as follows: add water to the reaction vessel, heat to 50°C, add the main active agent and polyethylene glycol 400, stir for 50 minutes, and control the temperature at 65°C; after cooling, add sodium lauroyl glutamate, stir for 15 minutes, and control the temperature at 25°C; then add polyepoxysuccinic acid and oleic acid diethanolamide, stir for 30 minutes, and control the temperature at 25°C; finally, add fatty amine polyoxyethylene ether, stir for 10 minutes, and control the temperature at 20°C to obtain the gas well reservoir unblocking agent.

[0080] The unblocking performance of the unblocking agents prepared in Examples 1-5 and Comparative Examples 1-4 was tested. The corrosion rate was determined according to "SY / T0026-1999 Test Method for Corrosivity of Oilfield Produced Water", the dissolution rate was determined according to "Q / SY XJ0040-2001 Performance Evaluation Method for Acidizing Fluids Used in Oilfields", and the gel breaking rate was determined according to "SY / T 6380-2008 Standard for Performance Testing Method of Demulsifiers for Fracturing". The test results are shown in Table 1.

[0081] Table 1

[0082] Example 1 0.042 39.6 98.7 Example 2 0.045 39.1 98.3 Example 3 0.047 39.3 98.6 Example 4 0.041 39.5 98.5 Example 5 0.045 39.2 98.8 Comparative Example 1 0.027 38.9 98.7 Comparative Example 2 0.026 39.1 98.1 Comparative Example 3 0.015 32.9 90.9 Comparative Example 4 0.015 32.7 91.4 Commercially available unblocking agents 0.017 29.4 85.1

[0083] As shown in Table 1, Comparative Examples 1 and 2 lacked the solubilizer ethylene glycol and the dispersant fatty amine polyoxyethylene ether, respectively, resulting in a weakened wetting effect of the unblocking agent compared to Examples 1-5. Experimental data comparison revealed that the corrosion rate of Comparative Examples 1 and 2 was significantly reduced due to this effect. Examples 1-5, through the mixing of fatty amine polyoxyethylene ether and ethylene glycol in the system, exhibited bidirectional wetting function, thereby improving the unblocking agent's wetting ability on the soil layer and accelerating the corrosion rate. This demonstrates that the present invention achieves the unblocking effect by reducing surface tension, altering rock wettability, reducing or eliminating water lock, and lowering residual water saturation through the synergistic effect of the solubilizer ethylene glycol and the dispersant fatty amine polyoxyethylene ether.

[0084] Comparative Examples 3 and 4 lacked sodium lauroyl glutamate and polyvinyl alcohol, respectively. The lack of their synergistic effect resulted in significantly lower acidification efficiency and utilization rate of the unblocking agent compared to Examples 1-5. Experimental data comparison revealed that all data for Comparative Examples 3 and 4 were inferior to those of Examples 1-5. This demonstrates that the present invention can enhance acidification efficiency and improve the utilization rate of the unblocking agent through the synergistic effect of sodium lauroyl glutamate and polyvinyl alcohol.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas well reservoir unblocking agent, characterized in that, By mass, its raw material components include: 20-30 parts of main active agent, 1-2 parts of solubilizer, 2-5 parts of dispersant, 0.5-1 part of scale inhibitor, 0.5-2 parts of penetrant, 2-5 parts of sodium lauroyl glutamate, 6-10 parts of polyvinyl alcohol, and 50-70 parts of water; the main active agent is a mixture of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide, the solubilizer is one or two of polyethylene glycol or ethylene glycol, and the dispersant is an aliphatic amine dispersant.

2. The gas well reservoir unblocking agent according to claim 1, characterized in that, The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:1.5-2.5:1.5-2.

3. The gas well reservoir unblocking agent according to claim 2, characterized in that, The mass ratio of ethylenediaminetetraacetic acid, ethylene glycol monomethyl ether, and dimethylformamide is 1:2:1.

5.

4. The gas well reservoir unblocking agent according to claim 1, characterized in that, The scale inhibitor is one or more of sodium gluconate, sodium alginate, and polyepoxysuccinic acid.

5. The gas well reservoir unblocking agent according to claim 1, characterized in that, The penetrant is one or more of the following: tridecyl alcohol polyoxyethylene ether phosphate, 2-methyl-2,4-pentanediol, oleic acid diethanolamide, and polyoxyethylene polyoxypropylene propylene glycol ether.

6. The gas well reservoir unblocking agent according to claim 1, characterized in that, The mass ratio of sodium lauroyl glutamate to polyvinyl alcohol is 1:

2.

7. A method for preparing a gas well reservoir unblocking agent as described in any one of claims 1 to 6, characterized in that, Including the following steps: Step 1: Prepare materials. Weigh the main active ingredient, solubilizer, dispersant, scale inhibitor, penetrant, sodium lauroyl glutamate, polyvinyl alcohol, and water according to the mass ratio. Step 2: Add water to the reaction vessel, heat to 40-60℃, add the main active agent and solubilizer, stir for 40-60 minutes, and control the temperature at 60-65℃; after cooling, add sodium lauroyl glutamate and polyvinyl alcohol, stir for 10-20 minutes, and control the temperature at 20-30℃; then add scale inhibitor and penetrant, stir for 30-40 minutes, and control the temperature at 20-30℃; finally, add dispersant, stir for 10-20 minutes, and control the temperature at 20-30℃ to obtain the gas well reservoir unblocking agent.

8. The application of a gas well reservoir unblocking agent as described in any one of claims 1 to 6 in gas well development.