Foam drainage composition, foam drainage agent and application thereof
The foam drainage composition composed of cocamidopropyl betaine, tetradecyl dimethyl tertiary amine, perfluorononenyloxybenzene sulfonate and antioxidant 1076 solves the foaming and foam stabilization problems when the condensate oil content at the bottom of the well is high, achieving efficient drainage and production increase effects.
Patent Information
- Application Number
- CN202310428166.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-04-20
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2043-04-20
AI Technical Summary
When the condensate oil content at the bottom of the well exceeds 20%, the existing foam drainage agent has poor foaming and foam stabilization performance, which greatly reduces the drainage effect.
A foam drainage composition composed of cocamidopropyl betaine, tetradecyl dimethyl tertiary amine, perfluorononenyloxybenzene sulfonate, antioxidant 1076 and hypochlorite is used. Cocamidopropyl betaine is used as the main foaming agent, tetradecyl dimethyl tertiary amine is used as a foam stabilizer, perfluorononenyloxybenzene sulfonate reduces surface tension, antioxidant 1076 captures free radicals, and hypochlorite sterilizes and prevents microbial damage, thereby forming a high-efficiency foam drainage composition.
Under high condensate oil conditions, the foam drainage composition has good foaming, foam stabilization and liquid carrying properties, effectively draining wellbore liquid, reducing bottom hole back pressure, increasing gas well productivity and extending the life cycle of the gas well.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention relates to a foam drainage composition, a foam drainage agent and applications thereof, and belongs to the technical field of foam drainage agents. Background Art
[0002] As the gas field is developed for an increasing number of years, the gas in the reservoir is continuously produced, and the gas well production capacity gradually decreases. At the same time, formation water will be produced into the wellbore. If the produced water is not discharged from the wellbore in time, liquid accumulation will occur in the wellbore. As the liquid accumulation increases, the static liquid column pressure on the bottom of the well gradually increases, and the formation gas is compressed and difficult to produce. In severe cases, the gas well may be "drowned".
[0003] After being injected into a gas well, a foam dewatering agent comes into contact with the water or oil-water mixture in the well. The natural gas stirs the foam, generating a large amount of low-density, aqueous foam, which is then discharged to the surface along with the natural gas flow, achieving the goal of draining water and increasing production. However, in condensate gas reservoirs, as formation pressure gradually decreases and bottomhole pressure drops below the fluid's dew point, retrograde condensation occurs, causing condensate to precipitate from the gas and flow into the wellbore. This condensate weakens the foam's structural strength, reducing the foaming and stabilizing properties of the foam dewatering agent. Therefore, the drainage effectiveness of existing foam dewatering agents is significantly reduced when the bottomhole condensate content exceeds 20%. Summary of the Invention
[0004] The object of the present invention is to provide a foam drainage composition which can solve the problem that the current foam drainage agent has poor foaming performance and foam stabilization performance when the bottom hole condensate oil content exceeds 20%.
[0005] A second object of the present invention is to provide a foam drainage agent.
[0006] The third object of the present invention is to provide a foam drainage agent for use in foam drainage and gas production in gas wells.
[0007] In order to achieve the above objectives, the technical solution adopted by the foam drainage composition of the present invention is:
[0008] A foam drainage composition comprises the following components in parts by mass: 25-42 parts of cocamidopropyl betaine, 8-20 parts of tetradecyldimethyl tertiary amine, 6-17 parts of perfluorononenyloxybenzenesulfonate, 1.5-4 parts of antioxidant 1076 and 1-3 parts of hypochlorite.
[0009] In the foam drainage composition of the present invention, cocamidopropyl betaine is used as the main foaming agent, which is a zwitterionic surfactant with excellent stability under acidic and alkaline conditions, stable to hard water, excellent foaming power and wetting power, good compatibility with other types of surfactants, low toxicity, and good foaming and liquid-carrying performance in extreme environments containing high mineralization, high methanol, high condensate oil, and hydrogen sulfide; tetradecyl dimethyl tertiary amine is used as a foam stabilizer to improve the strength of the foam network skeleton, control the structural stability of the bubble liquid film, and make the surfactant molecules orderly distributed in the bubble liquid film, giving the foam good elasticity and self-repairing ability; sodium perfluorononenyloxybenzenesulfonate is a fluorocarbon anionic surfactant that can reduce the surface tension of the aqueous solution and the oil-water interfacial tension, thereby improving drainage. Liquid effect; Antioxidant 1076, as a commonly used main anti-steric hindered phenolic antioxidant, can play an antioxidant effect for a long time by capturing free radicals generated during the degradation process, thereby avoiding oxidation of cocamidopropyl betaine, tetradecyl dimethyl tertiary amine, and perfluorononenyloxybenzene sulfonate at high temperatures and reducing foaming, foam stabilization, and liquid carrying performance; Hypochlorite, as a chlorine-containing fungicide, can form hypochlorous acid in water and act on bacterial proteins, not only reacting with the cell wall, but also because of its small molecule and no charge, it can invade the cell and oxidize the protein or destroy its phosphate dehydrogenase, causing sugar metabolism disorders and cell death, thereby avoiding bacteria and other microorganisms from destroying cocamidopropyl betaine, tetradecyl dimethyl tertiary amine, and perfluorononenyloxybenzene sulfonate and reducing foaming, foam stabilization, and liquid carrying performance. When the foam drainage composition of the present invention is used for foam drainage in gas wells, it has multiple functions such as high oil resistance, rich foam, and efficient drainage, and is highly practical.
[0010] The experimental results show that perfluorononenyloxybenzene sulfonate, antioxidant 1076 and hypochlorite can improve the foaming and foam stabilizing properties of the mixture composed of tetradecyl dimethyl tertiary amine and cocamidopropyl betaine.
[0011] Preferably, the foam drainage composition comprises the following components in parts by mass: 25-40 parts of cocamidopropyl betaine, 8-18 parts of tetradecyldimethyl tertiary amine, 6-15 parts of perfluorononenyloxybenzenesulfonate, 1.5-3 parts of antioxidant 1076 and 2-3 parts of hypochlorite.
[0012] Preferably, the perfluorononenyloxybenzenesulfonate is sodium perfluorononenyloxybenzenesulfonate.
[0013] Preferably, the hypochlorite is sodium hypochlorite.
[0014] Preferably, in the foam drainage composition, the sum of the mass fractions of cocamidopropyl betaine, tetradecyl dimethyl tertiary amine, and perfluorononenyloxybenzene sulfonate is no less than 54 parts. Preferably, the sum of the mass fractions of cocamidopropyl betaine, tetradecyl dimethyl tertiary amine, and perfluorononenyloxybenzene sulfonate is 54-58 parts. A sum of no less than 54 parts by mass of cocamidopropyl betaine, tetradecyl dimethyl tertiary amine, and perfluorononenyloxybenzene sulfonate ensures that the foam drainage composition has good foaming, foam stabilization, and liquid-carrying properties when used for foam drainage.
[0015] Preferably, the foam drainage composition is prepared by a method comprising thoroughly mixing cocamidopropyl betaine with tetradecyldimethyl tertiary amine, then mixing with perfluorononenyloxybenzenesulfonate, and finally thoroughly mixing with antioxidant 1076 and hypochlorite. The foam drainage composition of the present invention has a simple preparation process, good production stability, low cost, and is easily scalable for industrial production.
[0016] The technical solution adopted by the foam drainage agent of the present invention is:
[0017] A foam drainage agent mainly consists of water and the foam drainage composition mentioned above.
[0018] The foam drainage agent of the present invention has good foaming, foam stabilizing and liquid carrying properties, and has good oil resistance effect. It is suitable for high-salinity and high-condensate oil and gas wells and can solve the problem of difficulty in draining liquid after wellbore liquid accumulation in high-condensate oil and gas wells.
[0019] Preferably, the mass ratio of water to the foam drainage composition is (38-41):(59-62).
[0020] The technical solution adopted by the application of the foam drainage agent of the present invention in gas well foam drainage and gas production is:
[0021] An application of the foam drainage agent as described above in foam drainage and gas production in gas wells.
[0022] The foam drainage agent of the present invention is used in foam drainage and gas production in gas wells. Even when the gas well contains a high mass fraction of condensate oil, it can still effectively drain the oil and water accumulation in the wellbore, reduce the bottom hole back pressure, increase the gas well production capacity, improve the recovery rate, and extend the entire life cycle of the gas well.
[0023] Preferably, the mass fraction of condensate oil in the water to be discharged from the gas well is not greater than 40%.
[0024] Preferably, the total mineralization of the water to be discharged from the gas well is not greater than 40,000 mg / L. DETAILED DESCRIPTION
[0025] The technical solution of the present invention will be further described below with reference to specific embodiments.
[0026] 1. Specific embodiments of the foam drainage composition of the present invention are as follows:
[0027] Example 1
[0028] The foam drainage composition of this embodiment is composed of the following components in parts by mass: 25 parts of cocamidopropyl betaine, 18 parts of tetradecyldimethyl tertiary amine, 15 parts of sodium perfluorononenyloxybenzenesulfonate, 1.5 parts of antioxidant 1076 and 2 parts of sodium hypochlorite.
[0029] Example 2
[0030] The foam drainage composition of this embodiment is composed of the following components in parts by mass: 30 parts of cocamidopropyl betaine, 15 parts of tetradecyldimethyl tertiary amine, 12 parts of sodium perfluorononenyloxybenzenesulfonate, 1.5 parts of antioxidant 1076 and 2 parts of sodium hypochlorite.
[0031] Example 3
[0032] The foam drainage composition of this embodiment is composed of the following components in parts by mass: 35 parts of cocamidopropyl betaine, 10 parts of tetradecyldimethyl tertiary amine, 10 parts of sodium perfluorononenyloxybenzenesulfonate, 2 parts of antioxidant 1076 and 2 parts of sodium hypochlorite.
[0033] Example 4
[0034] The foam drainage composition of this embodiment is composed of the following components in parts by mass: 40 parts of cocamidopropyl betaine, 8 parts of tetradecyldimethyl tertiary amine, 6 parts of sodium perfluorononenyloxybenzenesulfonate, 3 parts of antioxidant 1076 and 2 parts of sodium hypochlorite.
[0035] The foam drainage composition of Examples 1-4 was prepared by a method comprising the following steps: thoroughly mixing cocamidopropyl betaine and tetradecyl dimethyl tertiary amine, then mixing with sodium perfluorononenyloxybenzenesulfonate, and finally thoroughly mixing with antioxidant 1076 and sodium hypochlorite to obtain the foam drainage composition.
[0036] Comparative Example 1
[0037] The foam drainage composition of this comparative example is different from the foam drainage composition of Example 1 only in that the mass fraction of cocamidopropyl betaine in the foam drainage composition of this comparative example is 22 parts.
[0038] Comparative Example 2
[0039] The foam drainage composition of this comparative example is different from the foam drainage composition of Example 4 only in that the mass fraction of cocamidopropyl betaine in the foam drainage composition of this comparative example is 42 parts.
[0040] Comparative Example 3
[0041] The foam drainage composition of this comparative example is different from the foam drainage composition of Example 1 only in that the mass fraction of tetradecyldimethyl tertiary amine in the foam drainage composition of this comparative example is 20 parts.
[0042] Comparative Example 4
[0043] The foam drainage composition of this comparative example is different from the foam drainage composition of Example 4 only in that the mass fraction of tetradecyldimethyl tertiary amine in the foam drainage composition of this comparative example is 6 parts.
[0044] Comparative Example 5
[0045] The foam drainage composition of this comparative example is different from the foam drainage composition of Example 1 only in that the mass fraction of sodium perfluorononenyloxybenzenesulfonate in the foam drainage composition of this comparative example is 17 parts.
[0046] Comparative Example 6
[0047] The foam drainage composition of this comparative example is different from the foam drainage composition of Example 4 only in that the mass fraction of sodium perfluorononenyloxybenzenesulfonate in the foam drainage composition of this comparative example is 4 parts.
[0048] Comparative Example 7
[0049] The foam drainage composition of this comparative example is different from the foam drainage composition of Example 1 only in that the mass fraction of the antioxidant 1076 in the foam drainage composition of this comparative example is 1 part.
[0050] Comparative Example 8
[0051] The foam drainage composition of this comparative example is different from the foam drainage composition of Example 4 only in that the mass fraction of the antioxidant 1076 in the foam drainage composition of this comparative example is 4 parts.
[0052] Comparative Example 9
[0053] The foam drainage composition of this comparative example is different from the foam drainage composition of Example 1 only in that the mass fraction of sodium hypochlorite in the foam drainage composition of this comparative example is 1 part.
[0054] Comparative Example 10
[0055] The foam drainage composition of this comparative example is different from the foam drainage composition of Example 1 only in that the mass fraction of sodium hypochlorite in the foam drainage composition of this comparative example is 3 parts.
[0056] 2. Specific embodiments of the foam drainage agent of the present invention are as follows:
[0057] Example 5
[0058] The foam drainage agent of this embodiment is composed of water and the foam drainage composition of Example 1, and the mass ratio of water to the foam drainage composition is 38.5:61.5.
[0059] Example 6
[0060] The foam drainage agent of this embodiment is composed of water and the foam drainage composition of Example 2, and the mass ratio of water to the foam drainage composition is 39.5:60.5.
[0061] Example 7
[0062] The foam drainage agent of this embodiment is composed of water and the foam drainage composition of Example 3, and the mass ratio of water to the foam drainage composition is 41:59.
[0063] Example 8
[0064] The foam drainage agent of this embodiment is composed of water and the foam drainage composition of Example 4, and the mass ratio of water to the foam drainage composition is 41:59.
[0065] Comparative Example 11
[0066] The foam drainage agent of this comparative example is different from the foam drainage agent of Example 5 only in that the foam drainage composition used in the foam drainage agent of this comparative example is the foam drainage composition of Comparative Example 1.
[0067] Comparative Example 12
[0068] The foam drainage agent of this comparative example is different from the foam drainage agent of Example 8 only in that the foam drainage composition used in the foam drainage agent of this comparative example is the foam drainage composition of Comparative Example 2.
[0069] Comparative Example 13
[0070] The foam drainage agent of this comparative example is different from the foam drainage agent of Example 5 only in that the foam drainage composition used in the foam drainage agent of this comparative example is the foam drainage composition of Comparative Example 3.
[0071] Comparative Example 14
[0072] The foam draining agent of this comparative example is different from the foam draining agent of Example 8 only in that the foam draining composition used in the foam draining agent of this comparative example is the foam draining composition of Comparative Example 4.
[0073] Comparative Example 15
[0074] The foam drainage agent of this comparative example is different from the foam drainage agent of Example 5 only in that the foam drainage composition used in the foam drainage agent of this comparative example is the foam drainage composition of Comparative Example 5.
[0075] Comparative Example 16
[0076] The foam drainage agent of this comparative example is different from the foam drainage agent of Example 8 only in that the foam drainage composition used in the foam drainage agent of this comparative example is the foam drainage composition of Comparative Example 6.
[0077] Comparative Example 17
[0078] The foam drainage agent of this comparative example is different from the foam drainage agent of Example 5 only in that the foam drainage composition used in the foam drainage agent of this comparative example is the foam drainage composition of Comparative Example 7.
[0079] Comparative Example 18
[0080] The foam drainage agent of this comparative example is different from the foam drainage agent of Example 8 only in that the foam drainage composition used in the foam drainage agent of this comparative example is the foam drainage composition of Comparative Example 8.
[0081] Comparative Example 19
[0082] The foam drainage agent of this comparative example is different from the foam drainage agent of Example 5 only in that the foam drainage composition used in the foam drainage agent of this comparative example is the foam drainage composition of Comparative Example 9.
[0083] Comparative Example 20
[0084] The foam drainage agent of this comparative example is different from the foam drainage agent of Example 5 only in that the foam drainage composition used in the foam drainage agent of this comparative example is the foam drainage composition of Comparative Example 10.
[0085] 3. Specific examples of the application of the foam drainage agent of the present invention in foam drainage and gas production in gas wells are as follows:
[0086] Any of the foam drainage agents in Examples 5-8 can be used in foam drainage and gas production in gas wells.
[0087] Experimental Example 1
[0088] To screen different foaming agents and foam stabilizers to obtain the best composite foaming agent and foam stabilizer, the foaming agents and foam stabilizers were optimized. The oily water sample used in the following optimization method was made from simulated formation water and condensate oil returned from a gas well, with the mass fraction of condensate oil in the oily water sample being 10%. The simulated formation water had a total salinity of 40,000 mg / L and was prepared by dissolving sodium chloride, calcium chloride, and magnesium chloride in distilled water at a mass ratio of 105.0:9.0:6. The mass-to-volume ratio of sodium chloride to distilled water (g:mL) was 105.0:3000.
[0089] First, cocamidopropyl betaine, sodium lauryl sulfate, lauryl amide propyl ammonium oxide, and 1231 (dodecyl trimethyl ammonium chloride) were used as foaming agents. Different foaming agents were added to an oily water sample (the mass of the foaming agent was 0.3% of the mass of the oily water sample) and stirred evenly. The mixture was then placed in a 90°C constant-temperature water bath and aged for 3 hours until the foam completely disappeared. The test solution was then tested for foaming and foam stabilization properties at 90°C using a Roche-Mir foam instrument according to the method specified in standard SY / T 6465-2000. The foaming and foam stabilization test results of the different foaming agents are shown in Table 1.
[0090] Table 1 Foaming and foam stabilizing properties of different foaming agent main agents
[0091]
[0092]
[0093] As shown in Table 1, among the selected foaming agents, cocamidopropyl betaine has the best foaming performance and foam stabilization performance, so cocamidopropyl betaine is selected as the main foaming agent of the system.
[0094] Then, using cocamidopropyl betaine as the main foaming agent, and dodecyl dimethylamine oxide (OA-12), alkyl alcohol amide, and tetradecyl dimethyl tertiary amine as foam stabilizers, a mixture of cocamidopropyl betaine and different foam stabilizers was compounded (the mass ratio of cocamidopropyl betaine to each foam stabilizer was 25:18), then added to the oily water sample (the mass of the mixture was 0.3% of the mass of the oily water sample), stirred evenly, and then placed in a 90°C constant temperature water bath for aging for 3 hours until the foam completely disappeared to obtain a test solution. The foaming and foam stabilization properties of each test solution at 90°C were then tested using a Roche-Mills foam instrument according to the method in standard SY / T 6465-2000. The foaming and foam stabilization performance test results of the mixtures formed by compounding cocamidopropyl betaine and different foam stabilizers are shown in Table 2.
[0095] Table 2 Foaming and foam stabilization properties of mixtures formed by combining cocamidopropyl betaine with different foam stabilizers
[0096] Foam stabilizer Foaming capacity (mL) Foam stabilization capacity (mL) Dodecyl dimethyl amine oxide 233 162 Alkyl alcohol amide 235 145 Tetradecyldimethyl tertiary amine 230 170
[0097] As shown in Table 2, when cocamidopropyl betaine is used as the main foaming agent, among the selected foam stabilizers, tetradecyl dimethyl tertiary amine and cocamidopropyl betaine have the best overall performance after compounding, and the mixture formed by the two has good foaming and foam stabilization performance. Therefore, tetradecyl dimethyl tertiary amine and cocamidopropyl betaine are selected for compounding. And as shown in Tables 1 and 2, when tetradecyl dimethyl tertiary amine and cocamidopropyl betaine are used together, a synergistic effect can be produced.
[0098] Experimental Example 2
[0099] To compare the basic performance of the foam draining agent of the present invention with existing commercially available foam draining agents, the foam draining agent of Example 5 and two commercially available foam draining agents (Comparative Sample 1: Oil-Resistant Foam Repellent PQ-8 produced by Dongying Shipurui Petroleum Engineering Technology Co., Ltd.; Comparative Sample 2: Oil-Resistant Foam Repellent UT-1 produced by Chengdu Fuji Technology Co., Ltd.) were mixed with distilled water to prepare 100 mL solutions. The surface tension and interfacial tension of the solutions were then tested at 20°C. The mass of the foam draining agent was 3‰ of the mass of the distilled water. The experimental results are shown in Table 3.
[0100] Table 3 Surface tension and interfacial tension of aqueous solutions of the foam draining agent of Example 5 and two commercially available foam draining agents
[0101]
[0102]
[0103] The results show that the foam draining agent of Example 5 has low surface tension and interfacial tension. As foam forms, the liquid surface area increases, and the surface energy rises. According to the Gibbs principle, a system always tends to a state with lower surface energy. Low surface tension and interfacial tension can reduce the energy of the foam system, which is beneficial to foam stability.
[0104] Experimental Example 3
[0105] To evaluate the foaming, foam stabilization, and liquid-carrying properties of the foam draining agents of the present invention and commercially available foam draining agents, the foam draining agents of Examples 5-8 and Comparative Examples 11-20, as well as two commercially available foam draining agents (Comparative Sample 1: Oil-Resistant Foam Detoxifier PQ-8 produced by Dongying Shipurui Petroleum Engineering Technology Co., Ltd.; Comparative Sample 2: Oil-Resistant Foam Detoxifier UT-1 produced by Chengdu Fuji Technology Co., Ltd.), were added to an oily water sample and stirred evenly. The mixture was then aged in a 90°C constant-temperature water bath for 3 hours until the foam completely disappeared. The test solutions were then tested for foaming, foam stabilization, and liquid-carrying properties at 90°C using a Roche-Mir foam meter according to the methods described in standard SY / T 6465-2000. The mass of the foam draining agent was 3‰ of the mass of the oily water sample. Oily water samples were prepared from simulated formation water and condensate from gas wells. The mass fractions of condensate in the oily water samples were 10%, 20%, 30%, and 40%, respectively. The simulated formation water had a total salinity of 40,000 mg / L and was prepared by dissolving sodium chloride, calcium chloride, and magnesium chloride in distilled water at a mass ratio of 105.0:9.0:6. The mass-to-volume ratio of sodium chloride to distilled water (g:mL) was 105.0:3000. The foaming, foam stabilization, and liquid-carrying properties obtained from the experimental tests are shown in Table 4.
[0106] Table 4 Foaming, foam stabilization and liquid carrying performance of the foam drainage agents of Examples 5-8, Comparative Examples 11-20 and two commercially available foam drainage agents in oily water samples containing different mass fractions of condensate oil
[0107]
[0108]
[0109] The results show that the foam drainage agents of Examples 5-8 still have good foaming, foam stabilization and liquid carrying properties in oil-containing water samples with a condensate oil mass fraction of 40%, and all meet the index requirements (foaming performance ≥120mm, foam stabilization performance ≥50mm, liquid carrying performance ≥120mm), indicating that the foam drainage agents of Examples 5-8 have good oil-resistant effects, while the two commercially available comparative samples can no longer meet the index requirements in oil-containing water samples with a condensate oil mass fraction of 30%. The foam drainage agents of Comparative Examples 12, 13, 15, 18, 19 and 20 have little change in foaming, foam stabilization and liquid carrying properties as the filling ratio increases, but this will lead to an increase in the cost of the agent; the oil resistance of the remaining comparative examples deteriorates significantly after the condensate oil content reaches 40%.
[0110] At the same time, according to the foaming and foam stabilization performance test results in Tables 2 and 4, when a portion of the mixture consisting of tetradecyl dimethyl tertiary amine and cocamidopropyl betaine is replaced with sodium perfluorononenyloxybenzenesulfonate, antioxidant 1076, and sodium hypochlorite, the foaming and foam stabilization performance of the foam drainage composition formed is improved to a certain extent, indicating that sodium perfluorononenyloxybenzenesulfonate, antioxidant 1076, and sodium hypochlorite can improve the foaming and foam stabilization performance of the mixture consisting of tetradecyl dimethyl tertiary amine and cocamidopropyl betaine.
Claims
1. A foam drainage composition, characterized in that: The invention comprises the following components in parts by weight: 25-42 parts of cocamidopropyl betaine, 8-20 parts of tetradecyldimethyl tertiary amine, 6-17 parts of perfluorononenyloxybenzene sulfonate, 1.5-4 parts of antioxidant 1076 and 1-3 parts of hypochlorite.
2. The foam drainage composition according to claim 1, wherein The foam drainage composition comprises the following components in parts by mass: 25-40 parts of cocamidopropyl betaine, 8-18 parts of tetradecyldimethyl tertiary amine, 6-15 parts of perfluorononenyloxybenzene sulfonate, 1.5-3 parts of antioxidant 1076 and 2-3 parts of hypochlorite.
3. The foam drainage composition according to claim 1 or 2, characterized in that The perfluorononenyloxybenzenesulfonate is sodium perfluorononenyloxybenzenesulfonate; and the hypochlorite is sodium hypochlorite.
4. The foam drainage composition according to claim 1 or 2, characterized in that In the foam drainage composition, the sum of the mass parts of the cocamidopropyl betaine, tetradecyldimethyl tertiary amine and perfluorononenyloxybenzene sulfonate is not less than 54 parts.
5. The foam drainage composition according to claim 4, wherein In the foam drainage composition, the sum of the mass parts of the cocamidopropyl betaine, tetradecyl dimethyl tertiary amine and perfluorononenyloxybenzene sulfonate is 54 to 58 parts.
6. A foam drainage agent, characterized in that: The foam drainage composition mainly consists of water and the foam drainage composition according to any one of claims 1 to 5.
7. The foam drainage agent according to claim 6, characterized in that The mass ratio of water to the foam drainage composition is (38-41):(59-62).
8. Use of the foam drainage agent according to claim 6 or 7 in foam drainage and gas production in gas wells.
9. The use according to claim 8, characterized in that The mass fraction of condensate oil in the water to be discharged from the gas well is not greater than 40%.
10. The use according to claim 8, characterized in that The total mineralization of the water to be discharged from the gas well is not greater than 40,000 mg / L.