Self-tackifying micro-foam system as well as preparation and application thereof
Through the combined use of self-adhesive micro-foam systems, the problems of poor stability and gas channeling during foam flooding are solved, the oil field recovery rate is improved, and it shows good adaptability, especially in low permeability reservoirs.
Patent Information
- Application Number
- CN202410322265.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2025-09-23
AI Technical Summary
During the foam flooding process, the foam has poor stability and short effective period, which leads to serious gas channeling, affecting the gas injection effect and oil field recovery rate.
A self-adhesive microfoam system is adopted, by mixing the Gemini surfactant disodium octylphenol ether sulfosuccinate and the nonionic surfactant Triton-100 as foaming agents, combining the biopolymer xanthan gum and the hydrophobically associating polymer ZLS-1 or ZLS-2 as foam stabilizers, and using betaine surfactants as self-adhesive agents to control bubble size and increase viscosity.
It significantly improves the stability and injection effect of foam, reduces gas channeling, and enhances the recovery rate of oil fields, especially showing good adaptability in low permeability reservoirs.
Smart Images
Figure CN120682785A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a self-adhesive micro-foam system and its preparation and application. Background Art
[0002] Laboratory research and field development cases demonstrate that gas flooding is an effective method for developing this type of reservoir. Dissolving gas in crude oil reduces its viscosity, improves mobility, expands its volume, and reduces interfacial tension, achieving effective oil displacement. However, the most significant challenges during gas injection are gas channeling caused by viscous fingering, vertical gravity overburden, and reservoir heterogeneity, resulting in low sweep efficiency. Preventing gas channeling and delaying breakthrough are key issues that need to be addressed.
[0003] Extensive research and field trials at home and abroad have demonstrated that foam flooding, as a means of enhanced oil recovery (EOR), can effectively inhibit gas channeling during gas injection. This channeling prevention mechanism primarily stems from the foam's selective blocking of high-permeability zones, thereby diverting fluid flow. Furthermore, the foam's high apparent viscosity effectively controls the gas-oil mobility ratio, thereby maximizing the gas swept volume. During injection, the foam fluid blocks the dominant flow channels, significantly reducing the permeability of these channels and forcing subsequent injection fluids to migrate into the matrix, thereby forming a uniform and stable displacement front and significantly improving oil recovery. Furthermore, the surfactants in the foam fluid emulsify the crude oil and alter the wettability of the reservoir rock, thus playing a crucial role in improving oil removal efficiency. However, foam is a thermodynamically unstable system with poor stability and a short shelf life. Furthermore, the high resistance of the foam generated near the wellbore makes subsequent fluid injection difficult, making it less suitable for use in low-permeability and unconventional reservoirs. Summary of the Invention
[0004] The present invention is made in order to improve the stability of foam, prevent gas channeling in heterogeneous oil reservoirs, and improve the injection difficulty problem in low-permeability reservoirs, so as to increase crude oil recovery.
[0005] As a first aspect of the present invention, it relates to a self-adhesive microfoam system. The raw materials of the self-adhesive microfoam system include, by weight:
[0006] 0.4 parts of foaming agent;
[0007] Foam stabilizer 0.05-0.15 parts;
[0008] 2-3 parts of self-adhesive;
[0009] 96.45-97.55 parts of water.
[0010] In one or some optional embodiments, the foaming agent is a mixture of a gemini surfactant and a nonionic surfactant.
[0011] In one or some optional embodiments, the gemini surfactant is specifically disodium octylphenol ether sulfosuccinate monoester.
[0012] In one or some optional embodiments, the nonionic surfactant is Triton-100.
[0013] In one or some optional embodiments, the foam stabilizer is a biopolymer or a hydrophobic associating polymer.
[0014] In one or some optional embodiments, the biopolymer is xanthan gum.
[0015] In one or some optional embodiments, the hydrophobically associating polymer is ZLS-1 or ZLS-2.
[0016] In one or some optional embodiments, the preparation method of ZLS-1 includes: adding 25 g of acrylamide, 6.5 g of 2-acrylamido-2-methyl-1-propanesulfonic acid, and 7 g of acrylic acid to 75 g of deionized water, stirring uniformly, adding 10 mL of a 64 g / L mixture of ammonium persulfate and sodium bisulfite in a molar ratio of 2:3, reacting in a 40° C. water bath for 8 h, washing the resulting product with anhydrous ethanol, drying at 60° C. for 28 h, and grinding into powder to obtain ZLS-1.
[0017] In one or some optional embodiments, the preparation method of ZLS-2 includes: adding 25 g of acrylamide and 6.5 g of 2-acrylamido-2-methyl-1-propanesulfonic acid to 75 g of deionized water, stirring uniformly, adding 10 mL of a 64 g / L mixture of ammonium persulfate and sodium bisulfite with a molar ratio of 2:3, reacting in a 40° C. water bath for 8 h, washing the resulting product with anhydrous ethanol, drying at 60° C. for 28 h, and grinding into powder to obtain ZLS-2.
[0018] In one or some optional embodiments, the self-viscosity enhancer is a betaine surfactant.
[0019] In one or some optional embodiments, the number of carbon atoms in the alkyl chain of the betaine surfactant is 16-18.
[0020] In one or some optional embodiments, the betaine surfactant includes hexadecyldimethylhydroxypropylsulfobetaine.
[0021] In one or some optional embodiments, the diameter of a single bubble in the self-adhesive microfoam system is 50-200 μm, further 50-100 μm.
[0022] As a second aspect of the present invention, it relates to a method for preparing the above-mentioned self-adhesive microfoam system, which comprises:
[0023] S1, mixing a foaming agent, a foam stabilizer, a self-tackifying agent and water to obtain a foaming liquid;
[0024] S2. Transfer the foaming liquid to a high-speed stirrer for stirring.
[0025] In one or some optional embodiments, the stirring rate in S1 is 300-400 rpm / min, further 350 rpm / min; the stirring time in S1 is 2-3 h, further 2.5 h.
[0026] In one or some optional embodiments, the stirring rate in S2 is 12000-14000 rpm / min; the stirring time in S2 is 1-3 min, further 2 min.
[0027] As a third aspect of the present invention, it relates to the application of the self-adhesive microfoam system in oil field development, which includes use as an oil displacement agent and / or a plugging agent.
[0028] The self-adhesive microfoam system provided by the present invention comprises a mixture of a Gemini surfactant, disodium octylphenol ether sulfosuccinate monoester, and a nonionic surfactant, Triton-100, as a foaming agent. The disodium octylphenol ether sulfosuccinate monoester molecule contains two sulfonic acid groups and two hydroxyl groups, and has better interfacial tension reduction, foaming, and temperature and salt resistance properties than traditional anionic surfactants. Triton-100 can improve oil and gas recovery rates, and its combination with the Gemini surfactant can better exert foaming properties. The present invention also comprises a biopolymer xanthan gum and a hydrophobically associating polymer ZL S-1 or ZLS-2 are used as foam stabilizers. These two types of polymers can increase liquid phase viscosity, reduce bubble size, and improve foam stability. In addition, the present invention also uses betaine surfactants containing 14-18 carbon atoms in the alkyl chain as self-tackifiers. When the molecular concentration of the betaine surfactant in the solution exceeds the critical micelle concentration (CMC), the betaine surfactant spontaneously aggregates into spherical micelles, thereby increasing the solution viscosity. In addition, the cationic groups in this type of betaine surfactant can combine with the anionic groups of the gemini surfactant to form a larger molecular structure, thereby increasing the liquid film strength.
[0029] The preparation method provided by the present invention can achieve controllable size (diameter) of individual bubbles in the self-adhesive microfoam system by changing the stirring speed, stirring time, mass concentration of the foaming agent component and the type of the foaming agent component. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 This is an optical microscope photograph of the microfoam in Example 1. DETAILED DESCRIPTION
[0031] The following is a detailed description of the embodiments of the present invention: The embodiments of the present invention are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are given, but the scope of protection of the present invention is not limited to the following embodiments. The process parameters for which specific conditions are not specified in the following embodiments are generally based on conventional conditions.
[0032] The endpoints of the ranges and any values disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values can be combined with each other to form one or more new numerical ranges, and these numerical ranges should be considered to be specifically disclosed in the present invention.
[0033] It should be noted that in the examples of the present invention, the synthesis route of the hydrophobically associating polymer ZLS-1 used is as follows: using acrylamide (AM), 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), and acrylic acid (AA) as raw materials, 25 g AM, 6.5 g AMPS, and 7 g AA were added to 75 g deionized water, and after thorough stirring, 10 mL 64 g / L ammonium persulfate and sodium bisulfite (molar ratio 2:3) were added, and the mixture was reacted in a 40° C. water bath for 8 h. The resulting product was washed with anhydrous ethanol and then dried at 60° C. for 28 h. After grinding into powder, ZLS-1 was obtained.
[0034] It should be noted that in the examples of the present invention, the synthesis route of the hydrophobically associating polymer ZLS-2 used is as follows: using acrylamide (AM) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) as raw materials, 25 g of AM and 6.5 g of AMPS were added to 75 g of deionized water, and after thorough stirring, 10 mL of 64 g / L ammonium persulfate and sodium bisulfite (molar ratio 2:3) were added, and the mixture was reacted in a 40° C. water bath for 8 h. The resulting product was washed with anhydrous ethanol and then dried at 60° C. for 28 h. After grinding into powder, ZLS-2 was obtained.
[0035] It should be noted that in the embodiments of the present invention, the raw materials used and their sources include: disodium octylphenol ether sulfosuccinate (Shandong Youso), Triton-100 (McLean), xanthan gum (McLean), and hexadecyl dimethyl hydroxypropyl sulfobetaine (Shandong Youso); the instruments used include: a magnetic stirrer (Shanghai Chijiu), a mechanical electric stirrer (Shanghai Chijiu), and a Waring stirrer (Waring Laboratory Variable Speed Blender).
[0036] Unless otherwise specified, the “parts” referred to below are parts by mass.
[0037] Example 1
[0038] S1. Mix 0.2 parts of octylphenol ether sulfosuccinate monosodium salt, 0.2 parts of Triton-100, 0.1 parts of xanthan gum, 2 parts of cetostearyl dimethyl hydroxypropyl sulfobetaine and 97.5 parts of deionized water, and stir with a magnetic stirrer at a speed of 350 rpm / min for 2.5 hours.
[0039] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 14000 rpm / min and a stirring time of 2 min.
[0040] According to the measurement, 100 mL of foam liquid can produce 530 mL of foam, the average diameter of a single bubble is 62 μm, and the foam viscosity is 315 mPa·s. The optical microscope photo of the microfoam obtained in this embodiment is shown in FIG. Figure 1 As shown in the figure, the gas phase is a foaming gas such as CO2, N2, or oxygen-reduced air, while the thickening liquid phase contains surfactant molecules that self-assemble into micelles. The electrons in the double electron layer are directed toward the thickening liquid phase and the aqueous phase. The microfoam exists independently in the system, and there is no direct contact between the bubbles, which reduces gas diffusion and improves stability.
[0041] Example 2
[0042] S1. Mix 0.2 parts of octylphenol ether sulfosuccinate monosodium salt, 0.2 parts of Triton-100, 0.1 parts of ZLS-1, 2 parts of hexadecyl dimethyl hydroxypropyl sulfobetaine, and 97.5 parts of deionized water, and stir with a magnetic stirrer at a speed of 350 rpm / min for 2.5 hours.
[0043] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 14000 rpm / min and a stirring time of 2 min.
[0044] According to the measurement, 100 mL of foam liquid can produce 510 mL of foam, the average diameter of a single bubble is 91 μm, and the foam viscosity is 310 mPa·s.
[0045] Example 3
[0046] S1. Mix 0.2 parts of octylphenol ether sulfosuccinate monosodium salt, 0.2 parts of Triton-100, 0.1 parts of ZLS-2, 2 parts of hexadecyl dimethyl hydroxypropyl sulfobetaine, and 97.5 parts of deionized water, and stir with a magnetic stirrer at a speed of 350 rpm / min for 2.5 hours.
[0047] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 14000 rpm / min and a stirring time of 2 min.
[0048] According to the measurement, 100 mL of foam liquid can produce 510 mL of foam, the average diameter of a single bubble is 89 μm, and the foam viscosity is 317 mPa·s.
[0049] Example 4
[0050] S1. Mix 0.2 parts of octylphenol ether sulfosuccinate monosodium salt, 0.2 parts of Triton-100, 0.05 parts of xanthan gum, 2 parts of cetostearyl dimethyl hydroxypropyl sulfobetaine, and 97.45 parts of deionized water, and stir the mixture at 350 rpm / min for 2.5 hours using a mechanical electric stirrer.
[0051] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 14000 rpm / min and a stirring time of 2 min.
[0052] According to the measurement, 100 mL of foam liquid can produce 550 mL of foam, the average diameter of a single bubble is 92 μm, and the foam viscosity is 259 mPa·s.
[0053] Example 5
[0054] S1. Mix 0.2 parts of octylphenol ether sulfosuccinate monosodium salt, 0.2 parts of Triton-100, 0.15 parts of xanthan gum, 2 parts of cetostearyl dimethyl hydroxypropyl sulfobetaine, and 97.35 parts of deionized water, and stir the mixture at 350 rpm / min for 2.5 hours using a mechanical electric stirrer.
[0055] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 14000 rpm / min and a stirring time of 2 min.
[0056] According to the measurement, 100 mL of foam liquid can produce 500 mL of foam, the average diameter of a single bubble is 54 μm, and the foam viscosity is 374 mPa·s.
[0057] Example 6
[0058] S1. Mix 0.2 parts of octylphenol ether sulfosuccinate monoester disodium salt, 0.2 parts of Triton-100, 0.1 parts of xanthan gum, 3 parts of cetostearyl dimethyl hydroxypropyl sulfobetaine, and 96.5 parts of deionized water, and stir the mixture at 350 rpm / min using a mechanical electric stirrer for 2.5 hours.
[0059] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 14000 rpm / min and a stirring time of 2 min.
[0060] According to the measurement, 100 mL of foam liquid can produce 580 mL of foam, the average diameter of a single bubble is 61 μm, and the foam viscosity is 356 mPa·s.
[0061] Example 7
[0062] S1. Mix 0.2 parts of octylphenol ether sulfosuccinate monosodium salt, 0.2 parts of Triton-100, 0.1 parts of xanthan gum, 2 parts of cetostearyl dimethyl hydroxypropyl sulfobetaine, and 97.5 parts of deionized water, and stir at 350 rpm / min for 2.5 hours using a mechanical electric stirrer.
[0063] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 12000 rpm / min and a stirring time of 2 min.
[0064] According to the measurement, 100 mL of foam liquid can produce 520 mL of foam, the average diameter of a single bubble is 85 μm, and the foam viscosity is 304 mPa·s.
[0065] Combining the above examples, we can see that:
[0066] Combined with the analysis of Example 1, Example 2 and Example 3, it can be seen that different foam stabilizers can affect the size of individual bubbles, and xanthan gum can form smaller bubbles at the same mass concentration; Combined with the analysis of Example 1, Example 4 and Example 5, it can be seen that the greater the concentration of the foam stabilizer, the smaller the bubble size formed; Combined with the analysis of Example 1 and Example 6, it can be seen that increasing the mass concentration of the self-tackifier can increase the foaming volume and foam viscosity; Combined with the analysis of Example 1 and Example 7, it can be seen that during the foaming process, the faster the high-speed stirring speed, the smaller the bubble size formed.
[0067] Comparative Example 1
[0068] S1. Stir 0.2 parts of octylphenol ether sulfosuccinate monoester disodium salt, 0.2 parts of Triton-100, 0.1 parts of xanthan gum, 2 parts of cetostearyl dimethyl hydroxypropyl sulfobetaine and 97.5 parts of deionized water at a rotation speed of 350 rpm / min for 0.5 h.
[0069] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 14000 rpm / min and a stirring time of 2 min.
[0070] Measurements showed that 100 mL of foaming liquid produced 550 mL of foam, with an average individual bubble diameter of 99 μm, a large number of bubbles exceeding 100 μm in diameter, and a foam viscosity of 302 mPa·s. Analysis revealed that if the stirring time in step S1 is too short, the foaming liquid will be unevenly mixed, resulting in a wide distribution of bubble sizes.
[0071] Comparative Example 2
[0072] S1. Stir 0.2 parts of octylphenol ether sulfosuccinate monoester disodium salt, 0.2 parts of Triton-100, 0.1 parts of xanthan gum, 2 parts of cetostearyl dimethyl hydroxypropyl sulfobetaine and 97.5 parts of deionized water at a rotation speed of 350 rpm / min for 2.5 hours.
[0073] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 8000 rpm / min and a stirring time of 2 min.
[0074] Measurements showed that 100 mL of foam liquid produced 540 mL of foam, with an average diameter of 453 μm and a foam viscosity of 318 mPa·s. Analysis revealed that if the high-speed stirring speed in step S2 was too low, microfoam could not be formed.
[0075] Comparative Example 3
[0076] S1. Stir 0.2 parts of octylphenol ether sulfosuccinate monosodium salt, 0.2 parts of Triton-100, 0.1 parts of xanthan gum, 2 parts of lauryl betaine and 97.5 parts of deionized water at a rotation speed of 350 rpm / min for 2.5 hours.
[0077] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 14000 rpm / min and a stirring time of 2 min.
[0078] Measurements show that 100 mL of foam liquid produces 580 mL of foam, with an average bubble diameter of 88 μm and a foam viscosity of 283 mPa·s. Analysis shows that betaine-based surfactants with fewer than 16 carbon atoms in their alkyl chains are unable to achieve self-viscosity-enhancing properties.
[0079] Comparative Example 4
[0080] S1. Stir 0.2 parts of octylphenol ether sulfosuccinate monoester disodium salt, 0.1 parts of Triton-100, 0.2 parts of polyacrylamide, 2 parts of lauryl betaine and 97.5 parts of deionized water at a rotation speed of 350 rpm / min for 2.5 hours.
[0081] S2. Transfer the foaming liquid mixed evenly in S1 to a Waring stirrer with a stirring speed of 14000 rpm / min and a stirring time of 2 min.
[0082] Measurements showed that 100 mL of foam liquid produced 480 mL of foam, with an average diameter of 264 μm and a foam viscosity of 308 mPa·s. Analysis showed that conventional polyacrylamide-based foam stabilizers would not be able to form microfoam.
[0083] Test Example 1
[0084] The microfoam system prepared in Example 1 was injected into a core to conduct enhanced oil recovery testing. The artificial core used in the experiment measured 4.5 × 4.5 × 30 cm in length, width, and height, and had a gas permeability of 150 mD. During the test, the microfoam system was injected at a rate of 1.5 PV when the water cut of the produced fluid reached 97%. The test was then terminated by water flooding until the water cut of the produced fluid reached 97%. The results showed that the microfoam system could increase oil recovery by 28.35% compared to water flooding.
[0085] Test Example 2
[0086] The microfoam system prepared in Example 2 was injected into a core to conduct enhanced oil recovery testing. The artificial core used in the experiment measured 4.5 × 4.5 × 30 cm in length, width, and height, and had a gas permeability of 150 mD. During the test, the microfoam system was injected at a rate of 1.5 PV when the water cut of the produced fluid reached 97%. The test was then terminated by water flooding until the water cut of the produced fluid reached 97%. The results showed that the microfoam system could increase oil recovery by 25.13% compared to water flooding.
[0087] Test Example 3
[0088] The microfoam system prepared in Example 3 was injected into a core to conduct enhanced oil recovery testing. The artificial core used in the experiment measured 4.5 × 4.5 × 30 cm in length, width, and height, and had a gas permeability of 150 mD. During the test, the microfoam system was injected at a rate of 1.5 PV when the water cut of the produced fluid reached 97%. The test was then terminated by water flooding until the water cut of the produced fluid reached 97%. The results showed that the microfoam system could increase oil recovery by 24.92% compared to water flooding.
[0089] Test Example 4
[0090] The microfoam system prepared in Example 4 was injected into a core to conduct enhanced oil recovery testing. The artificial core used in the experiment measured 4.5 × 4.5 × 30 cm in length, width, and height, and had a gas permeability of 150 mD. During the test, the microfoam system was injected at a rate of 1.5 PV when the water cut of the produced fluid reached 97%. The test was then terminated by water flooding until the water cut of the produced fluid reached 97%. The results showed that the microfoam system could increase oil recovery by 26.88% compared to water flooding.
[0091] Test Example 5
[0092] The microfoam system prepared in Example 5 was injected into a core to conduct enhanced oil recovery testing. The artificial core used in the experiment measured 4.5 × 4.5 × 30 cm in length, width, and height, and had a gas permeability of 150 mD. During the test, the microfoam system was injected at a rate of 1.5 PV when the water cut of the produced fluid reached 97%. The test was then terminated by water flooding until the water cut of the produced fluid reached 97%. The results showed that the microfoam system could increase oil recovery by 29.36% compared to water flooding.
[0093] Test Example 6
[0094] The microfoam system prepared in Example 6 was injected into a core to conduct enhanced oil recovery testing. The artificial core used in the experiment measured 4.5 × 4.5 × 30 cm in length, width, and height, and had a gas permeability of 150 mD. During the test, the microfoam system was injected at a rate of 1.5 PV when the water cut of the produced fluid reached 97%. The test was then terminated by water flooding until the water cut of the produced fluid reached 97%. The results showed that the microfoam system could increase oil recovery by 30.11% compared to water flooding.
[0095] Test Example 7
[0096] The microfoam system prepared in Example 7 was injected into a core to conduct enhanced oil recovery testing. The artificial core used in the experiment measured 4.5 × 4.5 × 30 cm in length, width, and height, and had a gas permeability of 150 mD. During the test, the microfoam system was injected at a rate of 1.5 PV when the water cut of the produced fluid reached 97%. The test was then terminated by water flooding until the water cut of the produced fluid reached 97%. The results showed that the microfoam system could increase oil recovery by 24.53% compared to water flooding.
[0097] Although specific embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that various modifications and substitutions may be made to those details in light of all the teachings disclosed herein, and such modifications are within the scope of the present invention. The full scope of the present invention is given by the appended claims and any equivalents thereof.
Claims
1. A self-adhesive microfoam system, characterized in that: The raw materials of the self-adhesive microfoam system include, by weight: 0.4 parts of foaming agent; Foam stabilizer 0.05-0.15 parts; 2-3 parts of self-adhesive; 96.45-97.55 parts of water.
2. The self-adhesive microfoam system according to claim 1, wherein The foaming agent is a mixture of a gemini surfactant and a nonionic surfactant.
3. The self-adhesive microfoam system according to claim 2, wherein The gemini surfactant is specifically octylphenol ether sulfosuccinate monoester disodium salt.
4. The self-adhesive microfoam system according to claim 2, wherein The nonionic surfactant is Triton-100.
5. The self-adhesive microfoam system according to claim 1, wherein The foam stabilizer is a biopolymer or a hydrophobic associating polymer.
6. The self-adhesive microfoam system according to claim 5, wherein The biopolymer is xanthan gum.
7. The self-adhesive microfoam system according to claim 5, wherein The hydrophobically associating polymer is ZLS-1 or ZLS-2.
8. The self-adhesive microfoam system according to claim 7, wherein The preparation method of ZLS-1 comprises: adding 25 g of acrylamide, 6.5 g of 2-acrylamido-2-methyl-1-propanesulfonic acid, and 7 g of acrylic acid to 75 g of deionized water; stirring uniformly; adding 10 mL of a 64 g / L mixture of ammonium persulfate and sodium bisulfite in a molar ratio of 2:3; reacting in a 40° C. water bath for 8 h; washing the resulting product with anhydrous ethanol; drying at 60° C. for 28 h; and grinding into powder to obtain ZLS-1.
9. The self-adhesive microfoam system according to claim 7, wherein The preparation method of ZLS-2 comprises: adding 25 g of acrylamide and 6.5 g of 2-acrylamido-2-methyl-1-propanesulfonic acid to 75 g of deionized water, stirring uniformly, adding 10 mL of a 64 g / L mixture of ammonium persulfate and sodium bisulfite in a molar ratio of 2:3, reacting in a 40° C. water bath for 8 h, washing the resulting product with anhydrous ethanol, drying at 60° C. for 28 h, and grinding into powder to obtain ZLS-2.
10. The self-adhesive microfoam system according to claim 1, wherein The self-tackifying agent is a betaine surfactant.
11. The self-adhesive microfoam system according to claim 10, wherein The number of carbon atoms in the alkyl chain of the betaine surfactant is 16-18.
12. The self-adhesive microfoam system according to claim 11, wherein The betaine surfactant includes hexadecyldimethylhydroxypropylsulfobetaine.
13. The self-adhesive microfoam system according to claim 1, wherein The diameter of a single bubble in the self-adhesive microfoam system is 50-200 μm, further 50-100 μm.
14. A method for preparing the self-adhesive microfoam system according to any one of claims 1 to 13, characterized in that: The method comprises: S1, mixing a foaming agent, a foam stabilizer, a self-tackifying agent and water to obtain a foaming liquid; S2. Transfer the foaming liquid to a high-speed stirrer for stirring.
15. The self-adhesive microfoam system according to claim 14, wherein The stirring rate in S1 is 300-400 rpm / min, further 350 rpm / min; the stirring time in S1 is 2-3 h, further 2.5 h.
16. The self-adhesive microfoam system according to claim 14, wherein The stirring rate in S2 is 12000-14000 rpm / min; the stirring time in S2 is 1-3 min, further 2 min.
17. Use of the self-adhesive microfoam system according to any one of claims 1 to 13 in oil field development, the use comprising use as an oil displacement agent and / or a plugging agent.