Preparation method of temperature-sensitive temporary plugging material

Abstract

The application discloses a preparation method of a temperature-sensitive temporary plugging material. The main agent of the temperature-sensitive temporary plugging material is cellulose ether, which is a regenerated polymer resource and has the characteristic of LCST. Nano-silicon dioxide is added to the cellulose ether. A large number of silicon hydroxyl groups exist on the surface of the silicon dioxide and can interact with the hydroxyl groups on the cellulose ether molecules, so that the gelation temperature is increased. Organic regulator hydroxyethylidene diphosphonic acid tetrasodium is added, which can combine with Ca 2+ , Na + ions in the formation simulation water as a complexing agent, so that the gel strength and elasticity are enhanced. By changing the concentration of the hydroxyethylidene diphosphonic acid tetrasodium and the Ca 2+ , Na + content in the formation simulation water, the gelation temperature can be adjusted, so that the temperature-sensitive temporary plugging material can be gelled in a certain temperature range. The prepared temperature-sensitive temporary plugging material can be gelled in a certain temperature range and has strong elasticity, so that the formation can be plugged. After plugging, the temperature-sensitive temporary plugging material can be returned to a low-viscosity fluid to remove the plugging, and the oil well will not be blocked.

Description

Technical Field

[0001] The present invention relates to the field of profile control, and in particular to a method for preparing a temperature-sensitive temporary plugging material. Background Art

[0002] As oilfields entered the high-water-cut development phase in the 1990s, profile control and water-blocking technologies reached their peak. In the 21st century, high water-cut issues became a pressing issue for oilfields. Long-term waterflooding further exacerbated reservoir heterogeneity, leading to the prevalence of large pores and high-permeability channels in the oil layers. This caused injected water to flow directly to the bottom of the wells, severely reducing the effectiveness of waterflooding. Conventional profile control and water-blocking technologies could no longer meet the demands of waterflooding, prompting the development of profile control and water-blocking technologies to enter a new application phase. Among them, the cross-linked gel-type displacement system is not suitable for large-pore and fractured oil reservoirs due to its harsh gelation conditions and low blockage degree. It is not resistant to high temperatures, and the salt resistance mineralization cannot exceed 50,000 mg / L. The cross-linking time is slow. The long-term migration of the cross-linked system in the formation pores causes diffusion, dilution, shearing, degradation, etc., which makes the cross-linked system, which already has harsh gelation conditions on the ground, gel even worse underground, and even causes some cross-linked systems to be unable to cross-link; pre-cross-linked gel particles: to a certain extent, it is easy to form surface blockage and has certain requirements for construction technology. In addition, the particles also have certain restrictions on the permeability; foam deep profile control agent: short validity period and complex construction technology.

[0003] Temperature-sensitive temporary plugging materials refer to a type of gel whose phase transition is caused by changes in the gel's structure due to temperature. The important feature of temperature-responsive polymers is that they have a critical temperature for phase separation, that is, the polymer solution is single-phase below a certain temperature, and phase separation begins to occur above this temperature. In this case, the polymer has a lower critical solution temperature (LCST), and vice versa. At a temperature below its critical temperature, the blockage can be released, achieving the effect of temporarily plugging the oil well. Thermosensitive hydrogels with a low critical solution temperature can be roughly divided into two categories, including biomass-based natural polymer thermosensitive gels and synthetic polymer thermosensitive gels. Bio-based natural polymer thermosensitive materials are mainly polysaccharides, cellulose, etc. Synthetic polymer thermosensitive materials include poly (N-isopropylacrylamide) and the like.

[0004] Currently, there have been numerous research and inventions related to profile control agents, but the functions and effectiveness of various products vary. For example, patent CN112480887B discloses a cellulose-based temperature-sensitive gel plugging agent, which is formulated with cellulose, a nonionic monomer, acrylamide, a cationic monomer, acryloyloxyethyltrimethylammonium chloride, a toughening crosslinking agent, and an initiator. The provided temperature-sensitive gel plugging agent changes its phase characteristics with changes in the formation temperature field. Before injection, it is a free-flowing liquid. After injection, it undergoes cross-linking and transforms into a solid plugging agent with strong adhesion and elasticity, effectively plugging leakage channels. It also withstands high pressure, preventing repeated leakage in the formation, and the cross-linking effect is reversible. Patent CN105504158A discloses a smart gel particle that can be re-crosslinked under formation conditions, as well as its preparation method and application. The smart gel particle is formulated from acrylamide, an anionic monomer, a cationic monomer, N,N-vinylpyrrolidone, a pH adjuster, an initiator, crosslinker I, crosslinker II, a stabilizer, nanoparticle material, and water. After entering the formation, the smart gel particle re-crosslinks to form a monolithic gel, which can be used in oilfield profile control and water plugging, fluid loss control, and / or drilling and completion plugging operations. Patent CN115612237A relates to the field of hydrogel technology, and more specifically, to a preparation method and product of a temperature-sensitive hydrogel. This thermosensitive hydrogel is polymerized using acrylic acid and poly (N-isopropylacrylamide) as an initiator to obtain a polymeric material. The polymeric material is then coated while hot, cooled, and formed into a thermosensitive hydrogel. This preparation method increases the temperature at which the thermosensitive hydrogel undergoes a volume mutation from 32°C to 38°C. The thermosensitive hydrogel has water-absorbing properties, mimicking the principle of biological sweating. By utilizing the inherent properties of the thermosensitive hydrogel, which undergoes a volume mutation at 38°C, the thermosensitive hydrogel slowly releases water molecules to the outside world when the ambient temperature is above the volume mutation temperature, removing heat and achieving a cooling effect. When the ambient temperature is below the volume mutation temperature, the hydrogel absorbs water molecules from the air and returns to its original state.

[0005] Most of the current profile control agents form irreversible chemical cross-linked gels under certain conditions. First, there are deficiencies in achieving temperature control; second, they do not have the reversible cross-linking effect of phase recovery after cooling; third, they do not have certain flexibility and viscoelasticity. Summary of the Invention

[0006] Therefore, the present invention provides a method for preparing a temperature-sensitive temporary plugging material. The temperature-sensitive temporary plugging material can achieve high-temperature resistance, high mineralization, and high plugging strength to meet the conditions of complex oil reservoir development by changing the concentrations of the enhancer and regulator, thereby solving the above-mentioned technical problems.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme: a method for preparing a temperature-sensitive temporary plugging material, comprising the following raw materials in parts by weight: 100 parts of simulated formation water, 0.5-1 part of cellulose ether, 0.2-0.5 part of a reinforcing agent, and 0.5-1.5 parts of an organic regulator;

[0008] The temperature-sensitive temporary plugging material solution is prepared by the following method:

[0009] (1) Divide 100 parts of simulated formation water into three parts: 60 parts, 20 parts, and 20 parts respectively;

[0010] (2) dissolving cellulose ether in 60 parts of simulated formation water, stirring at 70° C. and 400 rpm for 10 to 20 minutes to obtain a cellulose ether solution;

[0011] (3) The cellulose ether solution stirred in step (2) is placed in ice water and stirred at 400 rpm for 30 to 40 minutes to obtain a main agent solution of the prepared temperature-sensitive plugging agent.

[0012] (4) dissolving the enhancer powder in 20 parts of simulated formation water and stirring with a magnetic stirrer at room temperature for 5 to 10 minutes to form an enhancer aqueous solution;

[0013] (5) dissolving the organic conditioning agent powder in 20 parts of simulated formation water, stirring with a magnetic stirrer at room temperature for 5 to 10 minutes to form an organic conditioning agent aqueous solution;

[0014] (6) The main agent solution, enhancer aqueous solution and organic regulator aqueous solution prepared in steps (3) to (5) are dissolved together, and stirred with a magnetic stirrer for 5 to 10 minutes at room temperature to obtain a temperature-sensitive temporary plugging material aqueous solution.

[0015] Preferably, the simulated formation water is of the water type of CaCl2, K + / Na + The concentration is 4000mg / L, Ca 2+ The concentration is 500mg / L, Mg 2+ The concentration is 1000mg / L, Cl - The concentration is 9000mg / L, SO4 2 -Concentration of 250mg / L, HCO3 - The concentration is 250 mg / L and the total mineralization is 15000 mg / L.

[0016] Preferably, the cellulose ether is one of hydroxypropyl methylcellulose ether and carboxymethyl cellulose ether. The cellulose ether needs to have good solubility, low initial viscosity, high gelling strength and stable gelling. The cellulose ether is hydroxypropyl methylcellulose ether. Since carboxymethyl cellulose ether has poor gelling strength at a certain temperature after dissolution and is grade B, hydroxypropyl methylcellulose ether has a low initial viscosity at a concentration of 1% and can pass through a formation with a permeability of 5000×10 -3 μm 2 The gel strength at 80-100℃ is G grade. Hydroxypropyl methylcellulose ether is preferred as the main agent of temperature-sensitive temporary plugging material, but the gel is unstable and the viscoelasticity is weak. Therefore, it is necessary to add a reinforcing agent or organic regulator to enhance the stability and viscoelasticity.

[0017] Preferably, the reinforcing agent is one of nano-silica or sodium earth, and as a reinforcing agent, it can play a certain role in enhancing gelation. As a reinforcing agent, it can play a certain role in enhancing gelation. There are a large number of silanol groups on the surface of silica, which can interact with the hydroxyl groups on the cellulose ether molecules to form hydrogen bonds, increase the entanglement between the cellulose ether molecules, and increase the viscosity of the compound solution, which also leads to an increase in the gelation temperature.

[0018] Preferably, the organic regulator is one of tetrasodium hydroxyethylidene diphosphonate, sodium tripolyphosphate or disodium ethylenediaminetetraacetic acid. The organic regulator has a greater influence on the gelation temperature because its molecular structure is similar to the Ca in the simulated formation water. 2+ 、Na + The complexation was formed by changing the Ca 2+ 、Na + The matching relationship between the concentration of ions and the concentration of organic regulators not only regulates the gelation temperature but also improves the gel strength. At the same time, the concentration of organic regulators can be changed according to the different salinity levels in the simulated water to achieve high salinity resistance.

[0019] Preferably, the aqueous solution of the temperature-sensitive temporary plugging material can gel at 50-100°C, and the gelling temperature is adjustable by adjusting the concentration of the added reinforcing agent and organic modifier. When the temperature drops below the LCST of the temperature-sensitive temporary plugging material, the material returns to its previous low viscosity, achieving a temporary plugging effect.

[0020] Preferably, the gelling strength of the temperature-sensitive temporary plugging material after gelling is measured by a visual code method.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides a temperature-sensitive temporary plugging material that can change its phase characteristics as the formation temperature field changes, achieving a phase change effect. When the temperature is below the LCST temperature, the temperature-sensitive temporary plugging material has a low viscosity and can easily flow into the formation pores. When the temperature is raised to the LCST temperature, the temperature-sensitive temporary plugging material will turn into a white gel. When the temperature drops back to the LCST temperature, the temperature-sensitive temporary plugging material will return to its previous low viscosity state, thereby achieving the effect of releasing the blockage and effectively temporarily plugging the formation.

[0023] The present invention provides a temperature-sensitive temporary plugging material, which is applicable to a formation temperature range of 50-100°C, and the gel phase transition temperature can be adjusted according to different formation temperature conditions.

[0024] The temperature-sensitive temporary plugging material provided by the present invention can adjust the gel strength and viscoelasticity by changing the concentration of cellulose ether, reinforcing agent and organic regulator, and can adapt to different Ca 2+ 、Na + Concentration of simulated formation water. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of gelation of the temperature-sensitive temporary plugging materials of Example 1, Example 2, Example 3 and Comparative Example 1 of the present invention at 50°C;

[0026] Figure 2 Schematic diagram of the gelation of the temperature-sensitive temporary plugging materials of Comparative Examples 2, 3, 4 and 5 of the present invention at 50°C. DETAILED DESCRIPTION

[0027] In order to further explain the technical solution of the present invention, specific embodiments are described in detail below.

[0028] Example 1

[0029] A temperature-sensitive temporary plugging material is composed of the following raw materials in parts by weight: 100 parts of simulated formation water; 1 part of cellulose ether: hydroxypropyl methylcellulose ether; 0.2 parts of reinforcing agent: nano-silica; and 1 part of organic regulator: tetrasodium hydroxyethylidene diphosphonate.

[0030] A method for preparing a temperature-sensitive temporary plugging material comprises the following steps:

[0031] (1) Divide 100 parts of simulated formation water into three parts: 60 parts, 20 parts, and 20 parts respectively;

[0032] (2) dissolving cellulose ether in 60 parts of simulated formation water, stirring at 70° C. and 400 rpm for 10 to 20 minutes to obtain a cellulose ether solution;

[0033] (3) Put the cellulose ether solution stirred in step (2) into ice water again, stir at 400 rpm in ice water for 30-40 min to obtain the prepared main agent solution of the temperature-sensitive plugging agent.

[0034] (4) Dissolve the reinforcing agent powder in 20 parts of simulated formation water, stir at room temperature with a magnetic stirrer for 5-10 min to form a reinforcing agent aqueous solution;

[0035] (5) Dissolve the organic regulator powder in 20 parts of simulated formation water, stir at room temperature with a magnetic stirrer for 5-10 min to form an organic regulator aqueous solution;

[0036] (6) Dissolve the main agent solution prepared in steps (3) to (5), the reinforcing agent aqueous solution and the organic regulator aqueous solution together, and stir again at room temperature with a magnetic stirrer for 5-10 min to obtain a temperature-sensitive temporary plugging material aqueous solution.

[0037] Example 2

[0038] A temperature-sensitive temporary plugging material, which is composed of the following raw materials in parts by weight: simulated formation water 100 parts; cellulose ether: hydroxypropyl methyl cellulose ether 1 part; reinforcing agent: nano silicon dioxide 0.5 part; organic regulator: tetrasodium hydroxyethylylidene diphosphonate 1 part.

[0039] A preparation method of a temperature-sensitive temporary plugging material, comprising the following steps:

[0040] (1) Divide 100 parts of simulated formation water into three parts, 60 parts, 20 parts and 20 parts respectively;

[0041] (2) Dissolve the cellulose ether in 60 parts of simulated formation water, stir at 70°C and 400 rpm for 10-20 min to obtain a cellulose ether solution;

[0042] (3) Put the cellulose ether solution stirred in step (2) into ice water again, stir at 400 rpm in ice water for 30-40 min to obtain the prepared main agent solution of the temperature-sensitive plugging agent.

[0043] (4) Dissolve the reinforcing agent powder in 20 parts of simulated formation water, stir at room temperature with a magnetic stirrer for 5-10 min to form a reinforcing agent aqueous solution;

[0044] (5) Dissolve the organic regulator powder in 20 parts of simulated formation water, stir at room temperature with a magnetic stirrer for 5-10 min to form an organic regulator aqueous solution;

[0045] (6) The main agent solution, the reinforcing agent aqueous solution and the organic regulator aqueous solution prepared in steps (3) to (5) are dissolved together, and then stirred for 5-10 min at normal temperature by using a magnetic stirrer to obtain a temperature-sensitive temporary plugging material aqueous solution.

[0046] Example 3

[0047] A temperature-sensitive temporary plugging material is prepared from the following raw materials in parts by weight: simulated formation water 100 parts; cellulose ether: hydroxypropyl methyl cellulose ether 1 part; reinforcing agent: nano-silica 0.2 part; organic regulator: tetrasodium hydroxyethane diphosphonate 0.5 part.

[0048] A method for preparing a temperature-sensitive temporary plugging material, comprising the following steps:

[0049] (1) The 100 parts of simulated formation water are divided into three parts, i.e. 60 parts, 20 parts and 20 parts;

[0050] (2) The cellulose ether is dissolved in the 60 parts of simulated formation water, and stirred for 10-20 min at 70°C and 400 rpm to obtain a cellulose ether solution;

[0051] (3) The cellulose ether solution stirred in step (2) is placed into ice water, and stirred for 30-40 min at 400 rpm in the ice water to obtain a prepared main agent solution of the temperature-sensitive plugging agent.

[0052] (4) The reinforcing agent powder is dissolved in the 20 parts of simulated formation water, and stirred for 5-10 min at normal temperature by using a magnetic stirrer to form a reinforcing agent aqueous solution;

[0053] (5) The organic regulator powder is dissolved in the 20 parts of simulated formation water, and stirred for 5-10 min at normal temperature by using a magnetic stirrer to form an organic regulator aqueous solution;

[0054] (6) The main agent solution, the reinforcing agent aqueous solution and the organic regulator aqueous solution prepared in steps (3) to (5) are dissolved together, and then stirred for 5-10 min at normal temperature by using a magnetic stirrer to obtain a temperature-sensitive temporary plugging material aqueous solution.

[0055] Table 1 Materials and amounts used in Examples 1-3

[0056]

[0057] The temperature-sensitive temporary plugging material aqueous solutions prepared in the above three examples can be gelled at 50-100°C, and the gelling is adjustable, such as Figure 1As shown, by adjusting the concentration of the added reinforcing agent and organic regulator, the temperature of the gelation can be adjusted. When the temperature is lower than the temperature of the LCST of the temperature-sensitive temporary plugging material, the temperature-sensitive temporary plugging material can restore the previous low viscosity state, thereby playing a role of temporary plugging.

[0058] Comparative Example 1

[0059] A preparation method of a temperature-sensitive temporary plugging material, which is different from Example 1 in that the reinforcing agent is replaced by sodium clay, and the types, amounts, experimental steps and experimental parameters of the remaining raw materials are consistent with those of Example 1.

[0060] Comparative Example 2

[0061] A preparation method of a temperature-sensitive temporary plugging material, which is different from Example 1 in that the organic regulator is replaced by sodium tripolyphosphate, and the types, amounts, experimental steps and experimental parameters of the remaining raw materials are consistent with those of Example 1.

[0062] Comparative Example 3

[0063] A preparation method of a temperature-sensitive temporary plugging material, which is different from Example 1 in that the organic regulator is replaced by disodium ethylenediaminetetraacetate, and the types, amounts, experimental steps and experimental parameters of the remaining raw materials are consistent with those of Example 1.

[0064] Comparative Example 4

[0065] A preparation method of a temperature-sensitive temporary plugging material, which is different from Example 1 in that the concentration of the organic regulator is increased to 1.5%, and the types, amounts, experimental steps and experimental parameters of the remaining raw materials are consistent with those of Example 1.

[0066] Comparative Example 5

[0067] A preparation method of a temperature-sensitive temporary plugging material, which is different from Example 1 in that the simulated formation water has a Ca 2+ concentration of 500 mg / L, a Mg 2+ concentration of 1000 mg / L, and a total salinity of 30000 mg / L, and the types, amounts, experimental steps and experimental parameters of the remaining raw materials are consistent with those of Example 1.

[0068] Performance detection:

[0069] 1. The gel strength of the temperature-sensitive temporary plugging material was observed by visual code observation method:

[0070] The temperature-sensitive temporary plugging material provided in the examples was dissolved in the simulated formation water according to the above steps, the gel strength of the solution at 50-100℃ was measured, and the state of the temporary plugging material at different temperatures was observed, and the results are shown in Table 1

[0071] First, based on the gel strength of the thermosensitive gel, the effects of the type and amount of the enhancer, the type and amount of the organic regulator, and the salinity of the simulated formation water on the gel strength were observed, and the gel strength of Examples 1-3 and Comparative Examples 1-4 were compared. The gel strength was determined using the code method, and the results are shown in Table 2.

[0072] Table 2 Code method gel strength

[0073]

[0074] As can be seen from Table 2, by comparison of Example 1 and Comparative Example 4, when the reinforcing agent is sodium soil, the gelling effect is the worst at 50-100°C, and the sodium soil has poor solubility and will precipitate, so sodium soil is not considered in this application. After the reinforcing agent nano-silica is added, the gelling strength of the overall temperature-sensitive temporary plugging material becomes higher, indicating that the effect of the reinforcing agent nano-silica is obvious, reaching grade H at 90-100°C.

[0075] As shown in Table 2, by comparing Example 1 with Example 2, it is found that when the concentration of the reinforcing agent nano-silica increases, the gel strength decreases, indicating that under the experimental conditions, the concentration of nano-silica in Example 1 is appropriate.

[0076] As shown in Table 2, by comparing Example 1 with Comparative Examples 2 and 3, it can be seen that when the concentrations of the cellulose ether and the reinforcing agent remain unchanged, the addition of tetrasodium hydroxyethylidene diphosphonate, sodium tripolyphosphate, or disodium ethylenediaminetetraacetic acid as the organic regulator results in a better gel strength than the other two organic regulators. Furthermore, rheological tests have shown that the addition of tetrasodium hydroxyethylidene diphosphonate can improve the viscoelasticity of the temporary plugging material, so tetrasodium hydroxyethylidene diphosphonate was selected as the organic regulator in the temperature-sensitive temporary plugging material.

[0077] As shown in Table 2, a comparison of Examples 1 and 3 with Comparative Example 4 shows that, when other conditions remain unchanged, the gelling strength of the entire temporary plugging system in Example 1 is the highest, and a 1% concentration of the organic regulator tetrasodium hydroxyethylidene diphosphonate is suitable. However, this solution still cannot meet the gelling requirements between 50 and 60°C.

[0078] As shown in Table 2, when the overall mineralization of the simulated formation water increases from 15,000 to 30,000 mg / L, the Ca 2+ ,Mg 2+The ion concentration is unchanged, the temporary plugging material can gel at 50-60℃, high concentration of salt can weaken the hydration of cellulose ether macromolecules, promote gelation, and sodium, calcium and magnesium ions can also act with sodium etidronate, which can inhibit the effect of calcium and magnesium on cellulose ether molecules, and can form a new crosslinked network with sodium, calcium and magnesium ions to improve the gelation degree, meeting the requirement that the temperature-sensitive temporary plugging material can gel at 50-100℃.

[0079] 2. Gelation reversibility test

[0080] As shown in Figure 2 Examples 1-3, Comparative Examples 1-5 were placed at their gelation temperature for a certain period of time, and after gelling, they were taken out and placed at room temperature for a period of time. It can be seen that Examples 1-3 and Comparative Examples 1-5 can all return to the original low-viscosity fluid at room temperature within 30 minutes, indicating that the temperature-sensitive temporary plugging material provided by the present application can play a role in plugging the formation and then returning to a low-viscosity fluid, thereby playing a temporary plugging role.

[0081] The above is only a preferred example of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent replacements of some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a temperature-sensitive temporary plugging material, characterized in that: The invention is composed of the following raw materials in parts by weight: 100 parts of simulated formation water, 0.5-1 part of cellulose ether, 0.2-0.5 part of enhancer, and 0.5-1.5 part of organic regulator; The temperature-sensitive temporary plugging material solution is prepared by the following method: (1) Divide 100 parts of simulated formation water into three parts: 60 parts, 20 parts, and 20 parts respectively; (2) Dissolve cellulose ether in 60 parts of simulated formation water, stir at 70°C and 400 rpm for 10-20 minutes to obtain a cellulose ether solution; (3) The cellulose ether solution stirred in step (2) is placed in ice water and stirred at 400 rpm for 30 to 40 minutes to obtain a main agent solution of the prepared temperature-sensitive plugging agent; (4) Dissolve the enhancer powder in 20 parts of simulated formation water and stir with a magnetic stirrer at room temperature for 5 to 10 minutes to form an enhancer aqueous solution; (5) Dissolve the organic regulator powder in 20 parts of simulated formation water and stir with a magnetic stirrer at room temperature for 5 to 10 minutes to form an organic regulator aqueous solution; (6) dissolving the main agent solution, enhancer aqueous solution and organic regulator aqueous solution prepared in steps (3) to (5) together, and stirring with a magnetic stirrer at room temperature for 5 to 10 minutes to obtain a temperature-sensitive temporary plugging material aqueous solution; The simulated formation water is of the CaCl2 type, K + / Na + The concentration is 4000mg / L, Ca 2+ The concentration is 500mg / L, Mg 2+ The concentration is 1000mg / L, Cl - The concentration is 9000mg / L, SO4 2- The concentration is 250mg / L, HCO3 - The concentration is 250 mg / L and the total mineralization is 15000 mg / L; The cellulose ether is one of hydroxypropyl methyl cellulose ether and carboxymethyl cellulose ether; The organic regulator is one of tetrasodium hydroxyethylidene diphosphonate, sodium tripolyphosphate or disodium ethylenediaminetetraacetate.

2. The method for preparing a temperature-sensitive temporary plugging material according to claim 1, characterized in that: The reinforcing agent is one of nano silicon dioxide or sodium earth.

3. The method for preparing a temperature-sensitive temporary plugging material according to claim 1, characterized in that: The temperature-sensitive temporary plugging material aqueous solution can gel at 50-100° C., and the gelling rate is adjustable.

4. The method for preparing a temperature-sensitive temporary plugging material according to claim 3, characterized in that: The gelling strength of the temperature-sensitive temporary plugging material after gelling is measured by visual code method.

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