Energy-saving and yield-increasing oil field discharge aiding agent and formula thereof

Abstract

The invention relates to the field of oilfield chemical assistants, in particular to an energy-saving and yield-increasing oilfield discharge aiding agent and a formula thereof. The invention relates to an energy-saving and yield-increasing oil field discharge aiding agent, which comprises the following raw materials: 60-100 parts of a modified chitosan and polyvinyl alcohol composite material; 30 to 50 parts of 4-ethyl-2-methylphenol; 10 to 20 parts of sodium dodecyl benzene sulfonate; 15 to 30 parts of polyacrylamide; and 5-15 parts of silicon dioxide. The oil field discharge aiding agent can effectively improve the fluidity of oil and gas, improve the oil and gas discharge and recovery efficiency, and maintain high stability and long-term effectiveness in a complex oil field environment. The test result of the embodiment shows that the cleanup additive is superior to the existing cleanup additive formula in the aspects of oil-water interfacial tension, flowability and drainage efficiency. The discharge aiding agent disclosed by the invention not only has relatively high performance, but also meets environmental protection requirements, can reduce energy consumption and improve oil extraction efficiency, has a wide application prospect, is particularly suitable for a high-temperature and high-pressure oil field environment, and can remarkably improve the oil extraction efficiency and economic benefits of an oil field.

Description

Technical Field

[0001] This invention relates to the field of oilfield chemical additives, and in particular to an energy-saving and production-enhancing oilfield drainage aid and its formulation. Background Technology

[0002] In oilfield development, drainage aids are important chemical agents that improve oil and gas flowability and drainage efficiency, and are widely used in oilfield production. Existing oilfield drainage aids mainly improve oilfield production efficiency by reducing oil-water interfacial tension and improving oil and gas flowability. However, existing oilfield drainage aids have certain technical problems that limit their application effectiveness in complex oilfield environments.

[0003] Traditional drainage aids are unstable under high temperature, high pressure, and extreme environmental conditions, leading to low oilfield extraction efficiency. In deep wells and high-temperature, high-pressure oilfields, conventional drainage aids often require significant energy consumption, directly impacting the overall energy efficiency and economic benefits of the oilfield. Existing drainage aids also exhibit poor stability. In acidic, alkaline, or high-salinity environments, they frequently degrade, fail, or experience performance degradation, failing to maintain drainage effectiveness for extended periods under complex oilfield conditions, thus hindering sustained improvements in oilfield extraction efficiency. Furthermore, some existing drainage aids contain chemical components that negatively impact the environment, particularly polluting water sources and soil. Certain drainage aids contain highly toxic or persistent chemicals, and their residues may cause long-term harm to the ecological environment. This not only violates the stringent environmental protection requirements of modern oilfields but also increases waste disposal costs.

[0004] There is an urgent need for an oilfield drainage aid that can improve oilfield production efficiency, reduce energy consumption, has good stability, and meets environmental protection requirements. Summary of the Invention

[0005] To overcome the technical difficulties mentioned above, the present invention aims to provide an energy-saving and production-enhancing oilfield drainage aid and its formulation, which can effectively improve oilfield production efficiency, reduce energy consumption, and maintain high stability and long-term effectiveness in complex oilfield environments, while also meeting environmental protection requirements. The present invention utilizes a modified chitosan and polyvinyl alcohol composite material, modified through aminosulfonate functional group grafting technology, giving the composite material excellent oil-water interface affinity and mechanical strength. The modification of the composite material significantly improves the stability of the drainage aid, especially its adaptability to high temperature, high pressure, and extreme environments. The present invention also incorporates the small molecule organic compound 4-ethyl-2-methylphenol, further enhancing oil-water separation performance and oil-gas flowability. Through these innovative designs, the present invention can effectively reduce energy consumption during oilfield extraction, significantly improve oilfield drainage efficiency, and the high stability of the modified composite material ensures the long-lasting effect of the drainage aid in extreme oilfield environments. Furthermore, the use of environmentally friendly materials and modification methods also meets the requirements of green chemistry and sustainable development.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] An energy-saving and production-enhancing oilfield drainage aid comprises the following raw materials by weight: 60-100 parts of modified chitosan and polyvinyl alcohol composite material; 30-50 parts of 4-ethyl-2-methylphenol; 10-20 parts of sodium dodecylbenzenesulfonate; 15-30 parts of polyacrylamide; and 5-15 parts of silica. The modified chitosan and polyvinyl alcohol composite material is a composite structure formed by grafting and cross-linking with sodium hydrogen sulfonate. The 4-ethyl-2-methylphenol is an aromatic organic small molecule with ethyl, methyl, and hydroxyl functional groups.

[0008] Optionally, the modified chitosan and polyvinyl alcohol composite material comprises the following raw materials by weight: 60-100 parts chitosan; 40-60 parts polyvinyl alcohol; 1-5 parts sodium hydrogen aminosulfonate; 1-10 parts glutaraldehyde; and 100-150 parts water.

[0009] Optionally, the preparation method of the modified chitosan-polyvinyl alcohol composite material includes the following steps:

[0010] (1) Dissolve chitosan and polyvinyl alcohol separately in water to obtain a homogeneous solution;

[0011] (2) Add sodium hydrogen aminosulfonate to a homogeneous solution and stir until homogeneous, so that it reacts with chitosan and polyvinyl alcohol to form a composite material grafted with aminosulfonate functional groups.

[0012] (3) Add glutaraldehyde as a crosslinking agent to promote the crosslinking reaction between chitosan and polyvinyl alcohol molecules and form a three-dimensional network structure;

[0013] (4) The modified chitosan and polyvinyl alcohol composite material is obtained by removing the solvent by heating.

[0014] Optionally, 4-ethyl-2-methylphenol comprises the following raw materials by weight: 30-50 parts phenol; 10-20 parts vinyl bromide; 5-10 parts iodomethane; and 50-100 parts ethanol.

[0015] Optionally, the preparation method of 4-ethyl-2-methylphenol includes the following steps:

[0016] (a) Add phenol, vinyl bromide and ethanol to the reaction vessel and stir until homogeneous;

[0017] (b) Iodomethane was added as a methylating agent, and the reaction was carried out at 50–70 °C for 1–2 hours to obtain the intermediate product 4-ethylphenol;

[0018] (c) The intermediate product 4-ethylphenol was reacted with iodomethane to introduce a methyl group, and the target product 4-ethyl-2-methylphenol was obtained.

[0019] (d) Excess solvent was removed by distillation and further purified by solvent extraction to obtain the final product 4-ethyl-2-methylphenol.

[0020] Optionally, a method for preparing an energy-saving and production-enhancing oilfield drainage aid includes the following steps:

[0021] S1, add the modified chitosan and polyvinyl alcohol composite material, 4-ethyl-2-methylphenol, sodium dodecylbenzenesulfonate, polyacrylamide and silica in a stirrer according to the mass ratio, add an appropriate amount of deionized water, and stir until completely dissolved and a uniform mixture is formed.

[0022] S2, heat the mixture to 50-70°C and continue stirring for 23 hours under constant temperature conditions to ensure that all components are fully and evenly mixed;

[0023] S3, the mixture is then evaporated under vacuum to remove moisture and solvent, resulting in a solid material;

[0024] S4 involves cooling the solid material to room temperature and then further processing it through sieving to obtain an energy-saving and production-enhancing oilfield drainage aid.

[0025] The beneficial effects of this invention are:

[0026] This invention modifies chitosan and polyvinyl alcohol composites using aminosulfonate functional group grafting technology, successfully improving the composite's hydrophilicity and interfacial activity, resulting in stronger stability and affinity at the oil-water interface. This technology particularly enhances the composite's durability in high-temperature, high-pressure oilfield environments, ensuring the high efficiency of the drainage aid under harsh conditions. The introduction of the small-molecule organic compound 4-ethyl-2-methylphenol improves oil-water separation performance, significantly reduces oil-water interfacial tension, and enhances oil and gas flowability and drainage efficiency. These innovative designs enable the oilfield drainage aid to significantly reduce energy consumption, improve oilfield extraction efficiency, while also having a longer service life and meeting environmental protection requirements, reducing negative environmental impacts. Attached Figure Description

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] Figure 1 A bar chart comparing the test results of oil-water interfacial tension for different ratios of energy-saving and production-enhancing oilfield drainage aids;

[0029] Figure 2 A bar chart comparing the flowability test results of different ratios of energy-saving and production-enhancing oilfield drainage aids;

[0030] Figure 3 A bar chart comparing the test results of the improvement rate of drainage efficiency of different ratios of energy-saving and production-enhancing oilfield drainage aids;

[0031] Figure 4 A bar chart comparing the test results of drainage rates of different ratios of energy-saving and production-enhancing oilfield drainage aids;

[0032] Figure 5 A bar chart comparing the test results of biodegradation rates of different ratios of energy-saving and production-enhancing oilfield drainage aids. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments. However, the present invention is not limited to the following embodiments. Equivalent adjustments made without departing from the spirit and essence of the present invention should also be considered to fall within the protection scope of the present invention.

[0034] Example 1:

[0035] This invention provides an energy-saving and production-enhancing oilfield drainage aid that can work stably for a long time in high-temperature and high-pressure oilfield environments and has high oil and gas drainage efficiency.

[0036] Formula: 100 parts of modified chitosan and polyvinyl alcohol composite material; 50 parts of 4-ethyl-2-methylphenol; 20 parts of sodium dodecylbenzenesulfonate; 30 parts of polyacrylamide; 15 parts of silica.

[0037] Preparation steps:

[0038] S1, add the modified chitosan and polyvinyl alcohol composite material, 4-ethyl-2-methylphenol, sodium dodecylbenzenesulfonate, polyacrylamide and silica in a stirrer according to the mass ratio, add an appropriate amount of deionized water, and stir until completely dissolved and a uniform mixture is formed.

[0039] S2, heat the mixture to 50-70°C and continue stirring for 3 hours under constant temperature conditions to ensure that all components are fully and evenly mixed;

[0040] S3, the mixture is then evaporated under vacuum to remove moisture and solvent, resulting in a solid material;

[0041] S4 involves cooling the solid material to room temperature and then further processing it through sieving to obtain an energy-saving and production-enhancing oilfield drainage aid.

[0042] Example 2:

[0043] This invention provides an energy-saving and production-enhancing oilfield drainage aid that is suitable for conventional oilfield environments, can improve drainage efficiency, and maintains stability and environmental friendliness.

[0044] Formula: 80 parts of modified chitosan and polyvinyl alcohol composite material; 40 parts of 4-ethyl-2-methylphenol; 15 parts of sodium dodecylbenzenesulfonate; 25 parts of polyacrylamide; 10 parts of silica.

[0045] Preparation steps:

[0046] S1, add the modified chitosan and polyvinyl alcohol composite material, 4-ethyl-2-methylphenol, sodium dodecylbenzenesulfonate, 25 parts of polyacrylamide and silica in a stirrer according to the mass ratio, add an appropriate amount of deionized water, and stir until completely dissolved and a uniform mixture is formed.

[0047] S2, heat the mixture to 50-70°C and continue stirring for 2 hours under constant temperature conditions to ensure that all components are fully and evenly mixed;

[0048] S3, the mixture is then evaporated under vacuum to remove moisture and solvent, resulting in a solid material;

[0049] S4 involves cooling the solid material to room temperature and then further processing it through sieving to obtain an energy-saving and production-enhancing oilfield drainage aid.

[0050] Example 3:

[0051] This invention provides an energy-saving and production-enhancing oilfield drainage aid that can provide optimized drainage and production effects in low-temperature and low-pressure oilfield environments, while also having low energy consumption.

[0052] Formula: 60 parts modified chitosan and polyvinyl alcohol composite material; 30 parts 4-ethyl-2-methylphenol; 10 parts sodium dodecylbenzenesulfonate; 15 parts polyacrylamide; 5 parts silica.

[0053] Preparation steps:

[0054] S1, add the modified chitosan and polyvinyl alcohol composite material, 4-ethyl-2-methylphenol, sodium dodecylbenzenesulfonate, polyacrylamide and silica in a stirrer according to the mass ratio, add an appropriate amount of deionized water, and stir until completely dissolved and a uniform mixture is formed.

[0055] S2, heat the mixture to 50-70°C and continue stirring for 12 hours under constant temperature conditions to ensure that all components are fully and evenly mixed;

[0056] S3, the mixture is then evaporated under vacuum to remove moisture and solvent, resulting in a solid material;

[0057] S4 involves cooling the solid material to room temperature and then further processing it through sieving to obtain an energy-saving and production-enhancing oilfield drainage aid.

[0058] Comparative Example 1:

[0059] This invention provides an energy-saving and production-enhancing oilfield drainage aid suitable for conventional oilfield environments. It improves drainage efficiency while maintaining stability and environmental friendliness. This comparative design verifies the effect of adding 4-ethyl-2-methylphenol on the performance of the oilfield drainage aid.

[0060] Formula: 80 parts modified chitosan and polyvinyl alcohol composite material; 15 parts sodium dodecylbenzenesulfonate; 25 parts polyacrylamide; 10 parts silica.

[0061] Preparation steps:

[0062] S1, add the modified chitosan and polyvinyl alcohol composite material, sodium dodecylbenzene sulfonate, polyacrylamide and silica in a stirrer according to the mass ratio, add an appropriate amount of deionized water, stir until completely dissolved and form a uniform mixture.

[0063] S2, heat the mixture to 50-70°C and continue stirring for 2 hours under constant temperature conditions to ensure that all components are fully and evenly mixed;

[0064] S3, the mixture is then evaporated under vacuum to remove moisture and solvent, resulting in a solid material;

[0065] S4 involves cooling the solid material to room temperature and then further processing it through sieving to obtain an oilfield drainage aid.

[0066] Comparative Example 2:

[0067] This invention provides an energy-saving and production-enhancing oilfield drainage aid suitable for conventional oilfield environments. It improves drainage efficiency while maintaining stability and environmental friendliness. This comparative design is used to verify the influence of the modifying components in a modified chitosan-polyvinyl alcohol composite material.

[0068] Formula: 80 parts chitosan and polyvinyl alcohol composite material; 40 parts 4-ethyl-2-methylphenol; 15 parts sodium dodecylbenzenesulfonate; 25 parts polyacrylamide; 10 parts silica.

[0069] Preparation steps:

[0070] S1, add chitosan and polyvinyl alcohol composite material, 4-ethyl-2-methylphenol, sodium dodecylbenzenesulfonate, polyacrylamide and silicon dioxide in a stirrer according to the mass ratio, add an appropriate amount of deionized water, stir until completely dissolved and form a uniform mixture.

[0071] S2, heat the mixture to 50-70°C and continue stirring for 2 hours under constant temperature conditions to ensure that all components are fully and evenly mixed;

[0072] S3, the mixture is then evaporated under vacuum to remove moisture and solvent, resulting in a solid material;

[0073] S4 involves cooling the solid material to room temperature and then further processing it through sieving to obtain an oilfield drainage aid.

[0074] Performance testing

[0075] 1. Oil-water interfacial tension test

[0076] The affinity of the drainage aid at the oil-water interface was tested to evaluate its oil-water separation performance. A certain amount of drainage aid solution was added to the oil-water mixture, and the interfacial tension at different concentrations was measured using a surface tensiometer. By comparing the interfacial tension of different formulations, the affinity and stability of the drainage aid at the oil-water interface were confirmed; the lower the value, the better the drainage aid effect.

[0077] 2. Oil and gas flowability test

[0078] The flowability of the drainage aid in the oilfield environment was tested to evaluate its effect on improving oil and gas flow. A high-pressure flow pipeline device was used to simulate the flow conditions in the oilfield. A mixture of oil and water was passed through the pipeline under specific pressure and temperature, with different concentrations of drainage aid added. Flow velocity and pressure drop were measured and recorded. The improvement in oil and gas flowability by reducing flow resistance and increasing flow velocity was evaluated; better flowability indicated a better drainage effect.

[0079] 3. Drainage efficiency test

[0080] The effect of oilfield drainage aids on improving oil and gas drainage efficiency was tested. Oilfield simulation equipment was selected, and tests were conducted under different oilfield conditions. Different concentrations of drainage aids were added to oil-water mixtures, and the drainage rate and recovery rate were measured. By measuring the improvement in drainage rate, the contribution of drainage aids to oil recovery efficiency was evaluated; the more significant the improvement in drainage efficiency, the better the effect of the drainage aid.

[0081] 4. High-temperature and high-pressure stability test

[0082] The stability of the drainage aid under high temperature and high pressure conditions was tested to ensure its durability in the complex environment of oilfields. The drainage aid solution was placed in a high temperature and high pressure environment to simulate the oilfield environment. Samples were taken at regular intervals to measure its appearance, concentration, oil-water separation effect, and other performance indicators, and the performance degradation of the drainage aid under high temperature and high pressure was determined. The stronger the stability, the longer the drainage aid's effect lasts in harsh environments; drainage aids with smaller performance changes and longer durability have better application prospects.

[0083] 5. Environmental protection test

[0084] The environmental impact of the drainage aid after use is tested to ensure it meets environmental protection requirements. This includes: biodegradation testing by immersing samples in soil or water to observe degradation in natural environments; immersion testing to test the toxicity of the aid to aquatic organisms; and ICP-MS testing to determine the presence of harmful heavy metals. The test results are used to assess whether the drainage aid meets environmental standards; faster degradation, lower toxicity, and lower heavy metal content indicate better environmental performance.

[0085] Table 1. Test Results of Oilfield Drainage Aids

[0086]

[0087]

[0088] According to the test results, Examples 1, 2, and 3 significantly outperformed Comparative Examples 1 and 2 in all aspects of performance, indicating that the energy-saving and production-enhancing oilfield drainage aid of the present invention has better overall performance. Examples 1, 2, and 3 represent applications under different oilfield environments, and their performance in terms of oil-water interfacial tension, fluidity, drainage efficiency, and stability all exceeded that of the comparative examples.

[0089] Example 2 exhibited the optimal oil-water interfacial tension of 15.2 mN / m, significantly lower than Comparative Examples 1 (22.3 mN / m) and 2 Comparative Examples 2 (23.4 mN / m), demonstrating superior oil-water separation performance. Lower oil-water interfacial tension means the drainage aid can better separate oil and water, promoting oil and gas flow and drainage. Regarding flowability, Example 2 showed a flow velocity of 3.2 m / s, significantly higher than Comparative Example 1 (2.0 m / s) and Comparative Example 2 (1.8 m / s), indicating that Example 2 effectively reduces flow resistance, improves oil and gas flowability and drainage efficiency, and reduces energy consumption in the oilfield.

[0090] Regarding drainage efficiency, Example 2 showed a 25% increase in recovery rate, significantly higher than Comparative Example 1's 12% and Comparative Example 2's 8%. This indicates that Example 2 can significantly improve oil production efficiency during oilfield drainage, thereby enhancing the oilfield's economic benefits. Simultaneously, Example 2's drainage rate of 5 L / min is higher than Comparative Example 1's 3.0 L / min and Comparative Example 2's 2.5 L / min, demonstrating a faster drainage rate and further improving oil and gas recovery efficiency.

[0091] Examples 1 and 3 also showed good performance in terms of flowability and drainage efficiency, but were still inferior to Example 2. Example 1 had a flow rate of 2.5 m / s, resulting in a 20% increase in drainage efficiency and a drainage rate of 4.2 L / min. While this was an improvement, it was still lower than that of Example 2. Example 3 had a flow rate of 2.8 m / s, resulting in a 22% increase in drainage efficiency and a drainage rate of 4.5 L / min. Although this showed some improvement, its high-temperature and high-pressure stability and biodegradation rate were worse than those of Example 2.

[0092] The test results of Comparative Examples 1 and 2 show that the overall performance of the drainage aid significantly decreased after removing the key component. In particular, its performance was inferior to that of the examples in terms of oil-water interfacial tension, flowability, drainage efficiency, and stability. Comparative Example 1 had an oil-water interfacial tension of 22.3 mN / m, a flow rate of 2.0 m / s, a drainage efficiency of 12%, and a drainage rate of 3.0 L / min; Comparative Example 2 had an oil-water interfacial tension of 23.4 mN / m, a flow rate of 1.8 m / s, a drainage efficiency of 8%, and a drainage rate of 2.5 L / min. This indicates that removing 4-ethyl-2-methylphenol or the modified material significantly reduces the effectiveness of the drainage aid, failing to achieve the high efficiency shown in the examples.

[0093] In summary, Examples 1, 2, and 3 significantly outperformed the comparative examples in terms of oil-water separation, flowability, drainage efficiency, and stability, demonstrating the significant advantages of the combination of modified materials and small-molecule organic compounds in energy-saving and production-enhancing oilfield drainage aids. The results indicate that the oilfield drainage aid of this invention performs excellently in improving oilfield production efficiency, reducing energy consumption, and demonstrating stability under complex environments, exhibiting broad application potential.

Claims

1. An energy-saving and production-enhancing oilfield drainage aid, characterized in that, The raw materials, by weight, include: 60-100 parts of modified chitosan and polyvinyl alcohol composite material; 30-50 parts of 4-ethyl-2-methylphenol; 10-20 parts of sodium dodecylbenzenesulfonate; 15-30 parts of polyacrylamide; and 5-15 parts of silicon dioxide. The modified chitosan and polyvinyl alcohol composite material is a composite structure formed by grafting and cross-linking with sodium hydrogen sulfonate. The 4-ethyl-2-methylphenol is an aromatic organic small molecule with ethyl, methyl, and hydroxyl functional groups.

2. The energy-saving and production-enhancing oilfield drainage aid according to claim 1, characterized in that, The modified chitosan and polyvinyl alcohol composite material comprises the following raw materials by weight: 60-100 parts chitosan; 40-60 parts polyvinyl alcohol; 1-5 parts sodium hydrogen aminosulfonate; and 1-10 parts glutaraldehyde. 100-150 parts water.

3. The energy-saving and production-enhancing oilfield drainage aid according to claim 1 or 2, characterized in that, The preparation method of the modified chitosan and polyvinyl alcohol composite material includes the following steps: (1) Dissolve chitosan and polyvinyl alcohol separately in water to obtain a homogeneous solution; (2) Add sodium hydrogen aminosulfonate to a homogeneous solution and stir until homogeneous, so that it reacts with chitosan and polyvinyl alcohol to form a composite material grafted with aminosulfonate functional groups. (3) Add glutaraldehyde as a crosslinking agent; (4) The modified chitosan and polyvinyl alcohol composite material is obtained by removing the solvent by heating.

4. The energy-saving and production-enhancing oilfield drainage aid according to claim 1, characterized in that, The 4-ethyl-2-methylphenol comprises the following raw materials by weight: 30-50 parts phenol; 10-20 parts vinyl bromide; 5-10 parts iodomethane; and 50-100 parts ethanol.

5. An energy-saving and production-enhancing oilfield drainage aid according to claim 1 or 4, characterized in that, The preparation method of the 4-ethyl-2-methylphenol includes the following steps: (a) Add phenol, vinyl bromide and ethanol to the reaction vessel and stir until homogeneous; (b) Iodomethane was added as a methylating agent, and the reaction was carried out at 50–70 °C for 1–2 hours to obtain the intermediate product 4-ethylphenol; (c) The intermediate product 4-ethylphenol was reacted with iodomethane to introduce a methyl group, and the target product 4-ethyl-2-methylphenol was obtained. (d) Excess solvent was removed by distillation and further purified by solvent extraction to obtain the final product 4-ethyl-2-methylphenol.

6. A method for preparing an energy-saving and production-enhancing oilfield drainage aid, wherein the energy-saving and production-enhancing oilfield drainage aid is as described in any one of claims 1 to 5, characterized in that, Includes the following steps: S1, add the modified chitosan and polyvinyl alcohol composite material, 4-ethyl-2-methylphenol, sodium dodecylbenzenesulfonate, polyacrylamide and silica in a stirrer according to the mass ratio, add an appropriate amount of deionized water, and stir until completely dissolved and a uniform mixture is formed. S2, heat the mixture to 50-70°C and continue stirring for 23 hours under constant temperature conditions to ensure that all components are fully and evenly mixed; S3, the mixture is then evaporated under vacuum to remove moisture and solvent, resulting in a solid material; S4 involves cooling the solid material to room temperature and then further processing it through sieving to obtain an energy-saving and production-enhancing oilfield drainage aid.

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