Emulsified fiber asphalt anti-sloughing plugging agent and preparation method thereof

Abstract

The application provides an emulsified fiber asphalt anti-sloughing plugging agent and a preparation method. The emulsified fiber asphalt anti-sloughing plugging agent is prepared by mixing emulsified asphalt, MMH positive glue and basalt fiber powder. The basalt fiber powder is distributed in a three-dimensional random pattern in the emulsified asphalt anti-sloughing plugging agent, which can enhance the strength of the asphalt plugging layer. The single fiber diameter of the basalt fiber powder is consistent with the average crack distribution of most shale formations, and the basalt fiber powder has good compatibility, which enhances the adhesion between the plugging layer and the formation after the emulsified asphalt is demulsified, and improves the anti-sloughing plugging effect. The MMH positive glue improves the stability of the whole system due to its own characteristics, and is beneficial to the adsorption, demulsification and patching of the emulsified asphalt and the formation with negative charge. The emulsified fiber asphalt anti-sloughing plugging agent enhances the strength of the plugging layer after the emulsified asphalt is demulsified, and improves the adhesion between the plugging layer and the formation, and improves the anti-sloughing plugging effect. In addition, the preparation process is simple, the cost is low, and the emulsified fiber asphalt anti-sloughing plugging agent has a high application prospect in the field of wellbore anti-sloughing plugging.

Description

Technical Field

[0001] This invention relates to the field of oilfield chemical technology, and in particular to a method for preparing and applying an emulsified fiber asphalt anti-collapse sealing agent. Background Technology

[0002] Emulsified asphalt is a commonly used wellbore stabilizer in oil and gas drilling. Its main principle is that after adsorption into the formation, the emulsified asphalt breaks down, forming flakes that soften and deform under formation temperature and pressure differential, thus being squeezed into formation fissures and pore throats, sealing the wellbore and preventing collapse. However, the effectiveness of emulsified asphalt-based anti-collapse sealing is significantly affected by the adhesion between the asphalt and the formation, the strength of the asphalt sealing layer, and the softening point of the asphalt. The adhesion between the asphalt and the formation is mainly achieved through adsorption onto the shale surface, but this adhesion sometimes falls short of the drilling engineer's expectations. The strength of the asphalt sealing layer is related to its thickness and the properties of the asphalt itself, and is one of the main performance parameters that drilling engineers aim to improve. The raw materials for asphalt-based treatment agents are petroleum asphalt and natural asphalt, with softening points mostly in the range of 40–100°C. For deep, high-temperature formations, especially complex formations above 150°C, it is difficult to effectively seal formation micro-fractures. For these reasons, drilling engineers have been working hard to improve the effectiveness of emulsified asphalt anti-collapse sealing agents in these three aspects.

[0003] Currently, to improve the adhesion between emulsified asphalt and the formation, the strength of the asphalt plugging layer, and the softening point of asphalt, related technical methods have been used to modify emulsified asphalt, resulting in emulsified asphalt anti-collapse agents with increased softening points, which can be applied to deep wells with higher temperatures. However, the adhesion between the asphalt and the formation after demulsification and the strength of the asphalt plugging layer still need further improvement to meet the requirements of higher anti-collapse and plugging performance. Although the techniques proposed in existing research to improve the adhesion between emulsified asphalt and the formation and the strength of the asphalt plugging layer have been promoted, they suffer from problems such as insufficient compatibility of modified emulsified asphalt with the formation, lack of system stability, and high cost. Furthermore, the adhesion between the emulsified asphalt and the formation and the strength of the asphalt plugging layer obtained still do not achieve the desired effect. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides an emulsified fiber asphalt anti-collapse sealing agent and its preparation method. The method involves modifying emulsified asphalt with basalt fiber powder and MMH positively charged adhesive (i.e., Mixed metal hydroxide, hereinafter referred to as MMH positively charged adhesive) to obtain an emulsified fiber asphalt anti-collapse sealing agent with significantly improved anti-collapse sealing effect. The specific invention content is as follows:

[0005] In a first aspect, the present invention provides an emulsified fiber asphalt anti-collapse sealant, wherein the emulsified fiber asphalt anti-collapse sealant is composed of emulsified asphalt, MMH positively charged adhesive, and basalt fiber powder:

[0006] The emulsified asphalt comprises 97.5% to 98.5% by mass.

[0007] The basalt fiber powder contains 1 to 1.5% by mass.

[0008] The mass percentage of the MMH positive electrode adhesive is 0.5% to 1%.

[0009] In a second aspect, the present invention provides a method for preparing the emulsified fiber asphalt anti-collapse sealing agent described in the first aspect above, the preparation method comprising the following steps:

[0010] S1. Heat the emulsified asphalt, then add basalt fiber powder to the emulsified asphalt to obtain a mixture of basalt and emulsified asphalt;

[0011] S2. Heat the mixture and add MMH positively charged adhesive to the mixture to obtain the emulsified fiber asphalt anti-collapse sealant.

[0012] Optionally, in step S1, the emulsified asphalt is anionic emulsified asphalt.

[0013] Optionally, in step S1, the mass ratio of the basalt fiber powder to the emulsified asphalt is (1-1.5%): (97.5-98.5%).

[0014] Optionally, in step S1, the diameter of the monofilaments of the basalt fiber powder is 5 to 8 micrometers;

[0015] The length of the basalt fiber powder is 10–60 micrometers.

[0016] Optionally, in step S1, the aspect ratio of the basalt fiber powder is (2:1) to (8:1).

[0017] Optionally, in step S1, the density of the basalt fiber powder is 1.75 g / cm³. 3 .

[0018] Optionally, in step S1, the heating temperature is 60°C.

[0019] Optionally, in step S2, the mass ratio of the MMH positive electrode adhesive to the mixture is (0.5-1%):(99-99.5%).

[0020] Optionally, in step S2, the heating temperature is 60°C.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] This invention provides an emulsified fiber-reinforced asphalt anti-collapse sealant, composed of emulsified asphalt, MMH positively charged adhesive, and basalt fiber powder. Experimental results show that the density of the emulsified fiber-reinforced asphalt anti-collapse sealant provided in this application is increased, the apparent viscosity AV increases from 8.5 mPa·s to 48 mPa·s, a growth rate of 464%, the dynamic shear force YP increases from 4.5 Pa to 24 Pa, a growth rate of 433%, and the static shear force increases from 1 / 2 Pa / Pa to 16 / 32 Pa / Pa. This indicates that the emulsified fiber-reinforced asphalt anti-collapse sealant has extremely strong dynamic and static suspension properties. After 24 hours of observation in a large-volume container, no stratification or settling of the basalt fiber powder was observed, indicating that the anti-collapse sealant system has good stability. Furthermore, the swelling rate of the bentonite adsorbed by the emulsified fiber-reinforced asphalt anti-collapse sealant is as low as 11.6%, demonstrating improved adsorption properties. Emulsified fiber-modified asphalt anti-collapse plugging agent, obtained by modifying emulsified asphalt with basalt fiber powder and MMH positively charged adhesive, exhibits good stability and compatibility with the formation. This enhances the strength of the plugging layer after emulsification and its adhesion to the formation, thereby improving the anti-collapse plugging effect. Furthermore, the entire preparation process is simple and inexpensive, showing great promise for application in wellbore anti-collapse plugging.

[0023] This invention provides a method for preparing an emulsified fiber-reinforced asphalt anti-collapse sealant. The method involves adding basalt fiber powder to emulsified asphalt and mixing thoroughly, then further adding MMH positively charged colloid and mixing thoroughly to obtain the emulsified fiber-reinforced asphalt anti-collapse sealant. The basalt fiber powder significantly enhances the strength of the asphalt sealing layer after demulsification in the emulsified asphalt anti-collapse sealant. It also enhances the compatibility between the asphalt sealing layer and the formation, thereby increasing the adhesion between the sealing layer and the formation and significantly improving the anti-collapse sealant effect of the emulsified asphalt. The addition of MMH positively charged colloid to the emulsified asphalt improves the stability of the system, which is highly beneficial for the storage, transportation, and use of the prepared emulsified fiber-reinforced asphalt anti-collapse sealant. An appropriate excess of MMH positively charged colloid gives the emulsified fiber-reinforced asphalt anti-collapse sealant a positively charged characteristic, which is conducive to the adsorption, demulsification, and formation of the emulsified asphalt onto the negatively charged formation. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1A flowchart of the preparation method of the emulsified fiber asphalt anti-collapse sealant provided in the embodiment of the present invention is shown;

[0026] Figure 2 A schematic diagram illustrating the principle of performance enhancement of the emulsified fiber asphalt anti-collapse sealing agent provided in an embodiment of the present invention is shown. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention. Furthermore, all other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of the present invention.

[0028] Specific experimental steps or conditions are not specified in the embodiments; they can be performed according to the conventional experimental steps or conditions described in the prior art. Reagents and other instruments used, unless otherwise specified, are all commercially available conventional reagent products. Furthermore, the accompanying drawings are merely illustrative diagrams of the embodiments of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore, repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0030] In the description of this invention, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0031] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] The emulsified asphalt anti-collapse agent provided by the authors of this application in patent "An Emulsified Asphalt Anti-collapse Agent and Its Preparation Method, ZL201810117538.9" generates a reaction product with a three-dimensional network structure through the reaction of epoxy resin and curing agent. Then, the emulsified asphalt is dissolved in this three-dimensional network structure. Due to the strong stability of the three-dimensional network structure, the temperature resistance of the prepared emulsified asphalt anti-collapse agent can be improved, thereby increasing the softening point of the asphalt after demulsification, making it suitable for use in deep wells with higher temperatures. The asphalt softening point can be increased from 60℃ to over 150℃, thus meeting the needs of high-temperature deep well anti-collapse. However, in recent years of application, it has been found that the adhesion between the asphalt and the formation after demulsification and the strength of the asphalt sealing layer still need to be further improved to meet the needs of higher anti-collapse sealing performance.

[0033] In their article "Research and Application of Asphalt in Petroleum Drilling" published in Volume 6, Issue 1 of *Xinjiang Petroleum and Natural Gas*, Yang Yuliang, Li Yueming, Ma Shichang, and others reported that different processes and raw materials used in asphalt modification will yield different types of products. The main methods include direct feeding, solvent method, blending method, sulfonation method, emulsification method, and graft copolymerization method, resulting in products with varying properties. Regarding improving the adhesion between asphalt and the formation, incorporating lime powder, sulfonated lignite powder, and other related materials into emulsified asphalt can improve this adhesion. However, years of application have shown that the effect of incorporating lime powder and sulfonated lignite powder into emulsified asphalt in improving the adhesion between asphalt and the formation still does not reach the level expected by field engineers.

[0034] In the modification of emulsified asphalt, economic efficiency and system stability are important considerations. The published patent (application number 201410730046.9) "A Nanofiber Modified Emulsified Asphalt and Its Preparation Method" provides an emulsified asphalt for road repair construction modification, which incorporates nanofibers. The high cost of nanofibers (one million yuan per ton) significantly increases the unit price of emulsified asphalt products. The drilling anti-collapse sealing agent market cannot accept products with excessively high unit prices. Furthermore, to maintain a density of 1.85 g / cm³... 3 The patented method for improving the suspension stability of carbon nanofibers in the system involves adding thickening and stabilizing agents such as polyvinyl alcohol, sodium carboxymethyl cellulose, and polyacrylamide at a mass-volume ratio of 0.5%, because the density of emulsified asphalt is 0.98–1.05 g / cm³. 3 With a density of 1.85 g / cm³ 3 The difference between carbon nanofibers and other materials is significant. The amount of this thickening and stabilizing agent can only maintain the stability of the system for a short period of time. Over time, the carbon nanofibers will precipitate and become unusable. To maintain the stability of the system for a long time, the amount of thickening and stabilizing agent must be increased significantly. This will cause the emulsified asphalt to lose its fluidity and become unusable as well.

[0035] In the process of modifying emulsified asphalt, compatibility with the geological formation is also an important consideration. A published patent (application number 202010963483.0) entitled "A Composite Fiber Emulsified Asphalt Mixture and Its Preparation Method" provides an emulsified asphalt for road repair construction modification. The fibers used are one of polyester fibers, polypropylene fibers, and carbon fibers, with diameters ranging from 150 to 300 micrometers. However, micro-cracks in the geological formation are typically distributed between nanometers and tens of micrometers, and fibers with excessively large diameters cannot effectively penetrate these micro-cracks.

[0036] Based on the aforementioned problems of poor stability, poor compatibility with formations, and high cost of emulsified asphalt anti-collapse agents, and the fact that the strength of the asphalt sealing layer and the adhesion between the sealing layer and the formation still do not achieve ideal results when used on wellbore walls, this invention proposes to modify emulsified asphalt with MMH positively charged adhesive and basalt fiber powder to obtain an emulsified fiber asphalt anti-collapse sealing agent. In this agent, the basalt fiber powder exhibits a three-dimensional, disordered distribution within the emulsified asphalt anti-collapse sealing agent. As the emulsified asphalt demulsifies and connects in the formation, the basalt fiber powder forms a network-like strength layer within the asphalt, significantly enhancing the strength of the asphalt sealing layer. Furthermore, the basalt fiber powder has a single filament diameter of 5–8 micrometers, consistent with the average fracture distribution in most shale formations, resulting in good compatibility. The basalt fiber powder also has a length of 10–60 micrometers, allowing it to insert into formation fractures and significantly enhancing the adhesion between the asphalt sealing layer and the formation after the emulsified asphalt has demulsified. Therefore, basalt fiber powder in emulsified asphalt anti-slump sealing agents can significantly enhance the strength of the asphalt sealing layer after emulsification, and further enhance the adhesion between the sealing layer and the formation by improving the compatibility of the asphalt sealing layer after emulsification, thus significantly improving the anti-slump sealing effect of emulsified asphalt. Meanwhile, the addition of MMH positively charged colloid to emulsified asphalt due to its inherent properties improves the stability of the system, which is highly beneficial for the storage, transportation, and use of the prepared emulsified fiber asphalt anti-slump sealing agent. An appropriate excess of MMH positively charged colloid gives the emulsified fiber asphalt anti-slump sealing agent a positively charged characteristic, which is conducive to the adsorption, demulsification, and formation of the emulsified asphalt onto the negatively charged formation.

[0037] The emulsified fiber-reinforced asphalt anti-collapse plugging agent obtained by this invention exhibits good stability and compatibility with the formation. Furthermore, this agent significantly enhances the strength of the asphalt plugging layer after emulsification and the adhesion between the plugging layer and the formation, thereby improving the anti-collapse plugging effect. In addition, the entire preparation process is simple and inexpensive, making it highly promising for application in the field of wellbore anti-collapse plugging. Specific implementation methods are as follows:

[0038] In a first aspect, the present invention provides an emulsified fiber asphalt anti-collapse sealant, which is composed of emulsified asphalt, MMH positively charged adhesive and basalt fiber powder.

[0039] This invention provides an emulsified fiber-reinforced asphalt anti-collapse sealing agent. Basalt fiber powder is distributed in a three-dimensional, disordered pattern within the emulsified asphalt. As the emulsified asphalt breaks down and connects in the formation, the basalt fiber powder forms a network of strength within the asphalt, significantly enhancing the strength of the asphalt sealing layer. Furthermore, the basalt fiber powder has a single filament diameter of 5–8 micrometers, consistent with the average fracture distribution in most shale formations, meaning the compatibility between the emulsified asphalt and the formation is improved. In addition, the basalt fiber powder has a length of 10–60 micrometers, which, when inserted into formation fractures, greatly enhances the adhesion between the asphalt sealing layer and the formation after the emulsified asphalt breaks down, thus improving the anti-collapse sealing effect. MMH positively charged adhesive is an aluminum-magnesium hydroxide, mainly composed of divalent and trivalent metal ions, with a layered structure similar to hydrotalcite. It carries a permanent positive charge and, when combined with anionic emulsified asphalt, exhibits unique rheological properties: it appears as a pseudo-solid at rest, possessing a certain degree of elasticity, but exhibits extremely strong shear-dilution properties when stirred, a phenomenon known as "solid-liquid duality." This is primarily due to the resulting MMH-water-anionic emulsified asphalt composite structure. At rest, all the water in the system is polarized, forming a network structure with high structural strength, manifested as a high static shear force τ0. However, this polarized water chain is easily disrupted, leading to easy dilution during stirring. Furthermore, the formation and destruction of the polarized water chain structure are extremely rapid; the transformation from pseudo-solid to fluid, or vice versa, can be completed in a very short time. This characteristic is highly beneficial for the storage, transportation, and use of emulsified fiber asphalt anti-collapse sealing agents. Appropriate excess MMH positively charged adhesive imparts a positively charged characteristic to the emulsified fiber asphalt anti-collapse sealing agent, facilitating the adsorption, demulsification, and patch formation of the emulsified asphalt with negatively charged formations.

[0040] This invention provides an emulsified fiber asphalt anti-collapse sealing agent, wherein the mass percentage of emulsified asphalt is 97.5-98.5%; the mass percentage of basalt fiber powder is 1-1.5%; and the mass percentage of MMH positively charged adhesive is 0.5-1%.

[0041] Secondly, the present invention provides a method for preparing the emulsified fiber asphalt anti-collapse sealing agent described in the first aspect above. Figure 1 A flowchart illustrating the preparation method of the emulsified fiber asphalt anti-collapse sealing agent provided in an embodiment of the present invention is shown, as follows: Figure 1 As shown, the preparation method includes the following steps:

[0042] S1. Heat the emulsified asphalt, then add basalt fiber powder to the emulsified asphalt to obtain a mixture of basalt and emulsified asphalt;

[0043] In this step, the colloid mill is first turned on and the temperature is set at 60℃. The anionic emulsified asphalt is circulated and heated until the temperature reaches 60℃. The basalt fiber powder is slowly added to the emulsified asphalt in a mass ratio of 1-1.5% basalt fiber powder and 98.5-99% emulsified fiber asphalt anti-collapse sealant, over 2-3 cycles, to ensure that the basalt fiber powder is evenly dispersed in the emulsified asphalt.

[0044] S2. Heat the mixture and add MMH positively charged adhesive to the mixture to obtain the emulsified fiber asphalt anti-collapse sealant.

[0045] In this step, the colloid mill is started and the temperature is set to 60℃. The mixture of basalt fiber powder and emulsified asphalt is circulated and heated until the temperature reaches 60℃. Following a mass ratio of 0.5-1% MMH positively charged colloid and 99-99.5% of the emulsified asphalt and basalt fiber powder mixture, after two to three cycles, the MMH positively charged colloid is added to the emulsified asphalt. This ensures that the MMH positively charged colloid is uniformly dispersed in the emulsified asphalt.

[0046] Figure 2 The diagram illustrates the principle of performance enhancement of the emulsified fiber asphalt anti-collapse sealing agent provided in this embodiment of the invention, as shown below. Figure 2 As shown, basalt fibers are distributed in a three-dimensional, disordered manner in emulsified asphalt. After being adsorbed onto the wellbore and the emulsified asphalt breaks down, the basalt fiber powder forms a network of strength layers in the asphalt, which greatly enhances the strength of the asphalt sealing layer. The diameter of the basalt fiber powder is 5-8 micrometers, which is consistent with the average fracture distribution of most mudstone and shale formations, allowing some basalt fibers to insert into formation fractures. The length of the basalt fiber powder is 10-60 micrometers, which makes the asphalt sealing layer adhere to the formation as if countless nails were driven into it, greatly enhancing the adhesion between the sealing layer and the formation after the emulsified asphalt breaks down.

[0047] To enable those skilled in the art to more clearly understand the present invention, the following embodiments and test examples will be used to provide a detailed description of the emulsified fiber asphalt anti-collapse sealing agent and its application.

[0048] Example 1

[0049] 98.15 parts by weight of anionic emulsified asphalt, 1 part by weight of basalt fiber powder, and 0.85 parts by weight of MMH positively charged adhesive.

[0050] Weigh 981.5g of anionic emulsified asphalt. Set the temperature of the heated colloid mill to 60℃ and circulate the weighed anionic emulsified asphalt until the temperature reaches 60℃. Weigh 10g of basalt fiber powder and slowly add it to the emulsified asphalt over 2-3 cycles, ensuring that the basalt fiber powder is evenly dispersed in the emulsified asphalt. Weigh 8.5g of MMH positively charged adhesive and slowly add it to the emulsified asphalt containing basalt fiber powder over 2-3 cycles, ensuring that the MMH positively charged adhesive is evenly dispersed in the emulsified asphalt, thus obtaining the emulsified fiber asphalt anti-collapse sealing agent.

[0051] Example 2

[0052] 98.5 parts by weight of anionic emulsified asphalt, 1 part by weight of basalt fiber powder, and 0.5 parts by weight of MMH positively charged adhesive.

[0053] Weigh 985g of anionic emulsified asphalt. Set the temperature of the heated colloid mill to 60℃ and circulate the weighed anionic emulsified asphalt until the temperature reaches 60℃. Weigh 10g of basalt fiber powder and slowly add it to the emulsified asphalt over 2-3 cycles, ensuring uniform dispersion. Weigh 5g of MMH positively charged adhesive and slowly add it to the emulsified asphalt containing basalt fiber powder over 2-3 cycles, ensuring uniform dispersion. This yields the emulsified fiber asphalt anti-collapse sealing agent.

[0054] Example 3

[0055] 97.5 parts by weight of anionic emulsified asphalt, 1.5 parts by weight of basalt fiber powder, and 1 part by weight of MMH positively charged adhesive.

[0056] Weigh 975g of anionic emulsified asphalt. Set the temperature of the heated colloid mill to 60℃ and circulate the weighed anionic emulsified asphalt until the temperature reaches 60℃. Weigh 15g of basalt fiber powder and slowly add it to the emulsified asphalt over 2-3 cycles, ensuring uniform dispersion. Weigh 10g of MMH positively charged adhesive and slowly add it to the emulsified asphalt containing basalt fiber powder over 2-3 cycles, ensuring uniform dispersion. This yields the emulsified fiber asphalt anti-collapse sealing agent.

[0057] Example 4

[0058] 98 parts by weight of anionic emulsified asphalt, 1 part by weight of basalt fiber powder, and 1 part by weight of MMH positively charged adhesive.

[0059] Weigh 980g of anionic emulsified asphalt. Set the temperature of the heated colloid mill to 60℃ and circulate the weighed anionic emulsified asphalt until the temperature reaches 60℃. Weigh 10g of basalt fiber powder and slowly add it to the emulsified asphalt over 2-3 cycles, ensuring the basalt fiber powder is evenly dispersed. Weigh 10g of MMH positively charged adhesive and slowly add it to the emulsified asphalt containing basalt fiber powder over 2-3 cycles, ensuring the MMH positively charged adhesive is evenly dispersed, thus obtaining the emulsified fiber asphalt anti-collapse sealing agent.

[0060] Example 5

[0061] 98 parts by weight of anionic emulsified asphalt, 1.5 parts by weight of basalt fiber powder, and 0.5 parts by weight of MMH positively charged adhesive.

[0062] Weigh 980g of anionic emulsified asphalt. Set the temperature of the heated colloid mill to 60℃ and circulate the weighed anionic emulsified asphalt until the temperature reaches 60℃. Weigh 15g of basalt fiber powder and slowly add it to the emulsified asphalt over 2-3 cycles, ensuring the basalt fiber powder is evenly dispersed. Weigh 5g of MMH positively charged adhesive and slowly add it to the emulsified asphalt containing basalt fiber powder over 2-3 cycles, ensuring the MMH positively charged adhesive is evenly dispersed, thus obtaining the emulsified fiber asphalt anti-collapse sealing agent.

[0063] Experimental Example 1

[0064] This experimental example is used to verify the suspension performance observation, testing, and anti-collapse sealing performance detection of the emulsified fiber asphalt anti-collapse sealing agent prepared in Examples 1, 2, 3, and 4.

[0065] (1) Suspension stability of emulsified fiber asphalt anti-collapse sealant

[0066] The suspension performance test results of the emulsified fiber asphalt anti-collapse sealing agent provided in Example 1 above were compared with those of emulsified asphalt without basalt fiber powder and MMH positively charged adhesive. The results are shown in Table 1.

[0067] Table 1. Suspension stability of emulsified fiber asphalt anti-collapse sealing agent

[0068]

[0069]

[0070] The test results showed that the density of the emulsified fiber asphalt anti-collapse sealant increased slightly, the apparent viscosity AV increased from 8.5 mPa.s to 48 mPa.s, an increase of 464%, the dynamic shear force YP increased from 4.5 Pa to 24 Pa, an increase of 433%, and the static shear force increased from 1 / 2 Pa / Pa to 16 / 32 Pa / Pa. This indicates that the emulsified fiber asphalt anti-collapse sealant has extremely strong dynamic and static suspension properties. After 24 hours of observation in a large cylinder, no stratification of the emulsified fiber asphalt anti-collapse sealant was observed, nor was there any sedimentation of basalt fiber powder.

[0071] (2) Anti-collapse and sealing performance of emulsified fiber asphalt anti-collapse sealant

[0072] Table 2 Comparison of the performance of emulsified fiber asphalt anti-collapse sealant and commonly used anti-collapse agents in inhibiting bentonite expansion.

[0073]

[0074] Table 2 compares the performance of emulsified fiber asphalt anti-collapse sealant and commonly used anti-collapse agents in inhibiting bentonite expansion. Table 2 shows that adding 4% sulfonated asphalt, 4% FT-3000, and 4% emulsified asphalt to the slurry preparation effectively inhibited bentonite expansion, with expansion rates of 18.8%, 14.0%, and 14.8%, respectively. The expansion rate after adding 4% emulsified fiber asphalt anti-collapse sealant was 11.6%, showing the best expansion control performance. This indicates that the emulsified fiber asphalt anti-collapse sealant adsorbs better on the bentonite surface and has a better anti-collapse sealing effect.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0076] For the sake of simplicity, the method embodiments are described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps can be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and components involved are not necessarily essential to the present invention.

[0077] The above provides a detailed description of the emulsified fiber asphalt anti-collapse sealing agent and its preparation method provided by the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An emulsified fiber asphalt anti-collapse sealing agent, characterized in that, The emulsified fiber asphalt anti-collapse sealant is composed of emulsified asphalt, MMH positively charged adhesive, and basalt fiber powder. The emulsified asphalt comprises 97.5% to 98.5% by mass. The basalt fiber powder has a mass percentage of 1~1.5%; The mass percentage of the MMH positive electrode adhesive is 0.5% to 1%; The preparation method of the emulsified fiber asphalt anti-collapse sealing agent includes the following steps: S1. Heat the emulsified asphalt, then add basalt fiber powder to the emulsified asphalt to obtain a mixture of basalt fiber powder and emulsified asphalt; the emulsified asphalt is anionic emulsified asphalt; the monofilament diameter of the basalt fiber powder is 5-8 micrometers; the length of the basalt fiber powder is 10-60 micrometers. S2. Heat the mixture and add MMH positively charged adhesive to the mixture to obtain the emulsified fiber asphalt anti-collapse sealant.

2. The emulsified fiber asphalt anti-collapse sealing agent according to claim 1, characterized in that, In step S1, the aspect ratio of the basalt fiber powder is (2:1) to (8:1).

3. The emulsified fiber asphalt anti-collapse sealing agent according to claim 1, characterized in that, In step S1, the density of the basalt fiber powder is 1.75 g / cm³. 3 .

4. The emulsified fiber asphalt anti-collapse sealing agent according to claim 1, characterized in that, In step S1, the heating temperature is 60 ℃.

5. The emulsified fiber asphalt anti-collapse sealing agent according to claim 1, characterized in that, In step S2, the heating temperature is 60 ℃.

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