Well cementation cement stone based on water-based benzoxazine resin as well as preparation method and application of well cementation cement stone

Abstract

The invention relates to the technical field of well cementation materials and provides well cementation cement stone based on water-based benzoxazine resin as well as a preparation method and application of the well cementation cement stone. The well cementation cement stone is prepared from the following components in parts by mass: 400-600 parts of quartz sand, 4-6 parts of a retarder, 4-6 parts of a fluid loss agent, 1-2 parts of a suspension stabilizer, 1-2 parts of a dispersant, 4-6 parts of a high-temperature-resistant water-based benzoxazine monomer and 40-50 parts of water, and the high-temperature-resistant water-based benzoxazine monomer is prepared from a phenolic compound, primary amine and formaldehyde through Mannich reaction. Resin formed by the prepared benzoxazine monomer has improved mechanical properties at a high temperature of 150-200 DEG C, the mechanical properties and high temperature resistance of well cementation cement at a high temperature are significantly improved by filling pores of set cement and optimizing cement components, the benzoxazine monomer in a cement slurry system does not affect the fluidity of cement slurry, and the well cementation cement has a good application prospect. Meanwhile, the high-temperature strength of set cement can be remarkably enhanced, and the cement is suitable for well cementation of high-temperature deep wells.

Description

Technical Field

[0001] This invention relates to the field of cementing materials technology, and more specifically, to cementing stone based on aqueous benzoxazine resin, its preparation method, and its application. Background Technology

[0002] Cementing cement, a key material in oil and gas extraction, is used to fix drilling casing to the wellbore, forming a stable wellbore structure. Its performance directly affects the wellbore's sealing, stability, and long-term service capability. With the continuous growth of global energy demand, drilling operations are increasingly extending to deep wells, ultra-deep wells, and complex geological conditions. This places higher demands on the performance of cementing cement. Cementing cement needs to possess good fluidity, early strength development, high-temperature and high-pressure resistance, and good compatibility with the formation to ensure the long-term stability and safety of the wellbore. However, in high-temperature and high-pressure, highly permeable formations, and complex chemical environments, traditional cement slurries often face problems such as insufficient early strength, poor corrosion resistance, and reduced fluidity, making it difficult to meet the requirements of special operating conditions. Currently, epoxy resin and sulfonated phenolic resin are commonly used resins for cementing operations, but their poor heat resistance limits their application temperature, making them ineffective in deep and ultra-deep wells.

[0003] Therefore, research on the performance optimization of cementing cement and the development of new materials has important theoretical significance and practical application value, providing important support for improving drilling efficiency and ensuring the safety of energy extraction. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides cementing stone based on water-based benzoxazine resin, its preparation method, and its application. The resin formed from the prepared benzoxazine monomer exhibits improved mechanical properties at high temperatures (150°C to 200°C). By filling the pores of the cementing stone and optimizing the cement composition, the mechanical properties and high-temperature resistance of the cementing stone under high-temperature conditions are significantly improved. The benzoxazine monomer does not affect the flowability of the cement slurry in the cement slurry system, while significantly enhancing the high-temperature strength of the cementing stone, making it suitable for cementing operations in high-temperature deep wells.

[0005] The technical solution of this invention is as follows:

[0006] In a first aspect, the present invention provides a cementing stone based on aqueous benzoxazine resin, wherein the cementing stone is composed of 400-600 parts by weight of quartz sand, 4-6 parts of retarder, 4-6 parts of fluid loss reducer, 1-2 parts of suspension stabilizer, 1-2 parts of dispersant, 4-6 parts of high-temperature resistant aqueous benzoxazine monomer and 40-50 parts of water;

[0007] The high-temperature resistant aqueous benzoxazine monomer is prepared by the Mannich reaction of phenolic compounds, primary amines and formaldehyde.

[0008] The phenolic compound is at least one of glycosyl phenolic compounds and their derivatives and sulfonic acid phenolic compounds and their derivatives;

[0009] The primary amine is at least one of a monoamine or a diamine.

[0010] Furthermore, the preparation method of the high-temperature resistant water-based benzoxazine monomer is as follows: using the Mannich reaction, at 90-120℃, phenolic compounds, primary amines and formaldehyde are added in a molar ratio of (1-1.2):(1-2.4):(2.2-4.2), and the reaction is carried out for 12-24 hours to obtain the high-temperature resistant water-based benzoxazine monomer.

[0011] Furthermore, the structural formula of the high-temperature resistant water-based benzoxazine monomer is:

[0012] or or or or or or or .

[0013] Furthermore, the structural formulas of the glycosylphenolic compounds and their derivatives are as follows:

[0014] ;

[0015] Where R1 is or or or or or or or or or or .

[0016] Furthermore, the structural formula of the sulfonic acid phenolic compounds and their derivatives is as follows:

[0017] ;

[0018] Where R2 is or or or or or or or or or .

[0019] Furthermore, the primary amine has the following structural formula: or or or or or .

[0020] Furthermore, the curing peak temperature of the high-temperature resistant water-based benzoxazine monomer is 200℃-240℃, and its solubility is >100g / L.

[0021] Secondly, based on the same inventive concept, the present invention provides a method for preparing cementing stone based on aqueous benzoxazine resin as described in any of the first aspects, comprising the following steps:

[0022] The following ingredients are mixed by weight: 400-600 parts of quartz sand, 4-6 parts of retarder, 4-6 parts of water loss reducer, 1-2 parts of suspension stabilizer, 1-2 parts of dispersant, 4-6 parts of high-temperature resistant waterborne benzoxazine monomer, and 40-50 parts of water to prepare the slurry.

[0023] The slurry is stirred at 6000-8000 rpm for 40-60 seconds, then stirred at 3000-4000 rpm for 20-30 seconds, placed in a pressure curing vessel, and the curing temperature is set at 150-240℃ for 1-7 days to obtain the cementing stone.

[0024] Further, the retarder is at least one of hydroxycarboxylate, lignin sulfonate, and diethylenetriamine pentamethylphosphonic acid; the water loss reducing agent is at least one of AMPS copolymer and sulfonated phenolic resin; the suspension stabilizer is at least one of AMPS tackifying polymer and synthetic lithium saponite; and the dispersant is at least one of sulfonated styrene-maleic anhydride copolymer and AMPS copolymer.

[0025] Thirdly, based on the same inventive concept, this invention provides the application of cementing stone prepared by the method of preparing cementing stone based on water-based benzoxazine resin as described in any one of the first aspects or the method of preparing cementing stone based on water-based benzoxazine resin as described in any one of the second aspects in deep well cementing at 150-210℃ and 70-100MPa.

[0026] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0027] 1. The benzoxazine resin of the present invention has a curing temperature of 200~240℃, which is suitable for the high temperature working conditions of deep wells of 150~210℃. It solves the limitation of traditional resins with a temperature resistance of <150℃ and has no risk of thermal degradation at high temperature. When introduced into cement stone, it can effectively resist the high temperature environment of deep wells, inhibit the high temperature strength decay of cement stone, and improve its long-term service performance.

[0028] 2. The water solubility of benzoxazine monomer is >100g / L, and it has excellent compatibility with cement slurry systems. It does not affect the fluidity and thickening properties of cement slurry and has no risk of well cementing construction.

[0029] 3. The cement stone of this invention has a compressive strength that increases by ≥27% after curing at 180℃, and its tensile strength does not decrease, which can effectively improve the sealing and stability of deep well shafts.

[0030] 4. The cement stone of this invention can be used for various deep well operations such as cementing deep shale gas wells, cementing deep oil wells, sealing formation leaks, and sealing water outlet channels, making it highly practical. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0032] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 The 1H NMR spectrum of the benzoxazine monomer provided in Example 1 of this invention;

[0034] Figure 2 The infrared spectrum of the benzoxazine monomer provided in Example 1 of this invention;

[0035] Figure 3 The DSC diagram of the benzoxazine monomer provided in Example 1 of this invention;

[0036] Figure 4 The DSC spectrum of the benzoxazine monomer provided in Example 2 of this invention;

[0037] Figure 5 The DSC spectrum of the benzoxazine monomer provided in Example 3 of this invention;

[0038] Figure 6 The DSC spectrum of the benzoxazine monomer provided in Example 4 of this invention;

[0039] Figure 7 The DSC spectrum of the benzoxazine monomer provided in Example 5 of this invention;

[0040] Figure 8 The thickening curve of the cement slurry system provided in Example 1 of the present invention;

[0041] Figure 9The compressive strength of the benzoxazine system provided in Examples 1-5 of this invention relative to the control group. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0044] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed according to national standards. If no corresponding national standard exists, then generally accepted international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0045] Example 1

[0046] This embodiment 1 provides a method for preparing cementing stone based on aqueous benzoxazine resin, including the following steps:

[0047] Using urea as the amine source, 2.4424 g (0.02 mol) of p-hydroxybenzaldehyde, 0.6004 g (0.011 mol) of urea, and 1.2012 g of paraformaldehyde were added to a flask, along with 20 mL of dioxane solution. A condenser was connected, and the mixture was reacted at 100 °C for 12 h. After the reaction was stopped, the reactants were filtered and rotary evaporated, then dried in a vacuum oven at 60 °C for 24 h to obtain 3.183 g of benzoxazine monomer, with a yield of 75%. The chemical reaction equation is as follows:

[0048] ;

[0049] The obtained benzoxazine monomer was mixed and weighed with 500 parts of quartz sand, 5 parts of retarder, 5 parts of fluid loss reducer, 2 parts of suspension stabilizer, 2 parts of dispersant, 5 parts of high-temperature resistant water-based benzoxazine monomer, and 45 parts of water. According to GB / T 19139-2012 "Test Methods for Oil Well Cement," the accuracy of the electronic balance should be within ±0.1% of the indicated value to obtain the slurry. The retarder was diethylenetriaminepenta (methylenephosphonic acid); the fluid loss reducer was poly(acrylamide-co-2-acrylamido-2-methylpropanesulfonic acid-co-N-vinylpyrrolidone); the suspension stabilizer was hydrated lithium magnesium silicate; and the dispersant was poly(sodium p-styrenesulfonate-co-maleic anhydride).

[0050] According to GB / T 19139-2012 "Test Methods for Oil Well Cement", the mixing device used to prepare cement slurry is a 1L capacity, bottom-driven blade agitator. The mixing cup and agitator blades should be made of corrosion-resistant materials. The raw materials are added to the slurry cup at room temperature and stirred to prevent them from adhering to the walls. The slurry is then placed in a digital display high-speed mixer and stirred at 7000 rpm for 50 seconds, followed by stirring at 3500 rpm for 25 seconds to obtain a uniformly dispersed slurry. This slurry is then placed in a pressure curing vessel, set to a curing temperature of 150℃, and cured for 6 days to obtain cementing stone.

[0051] The 1H NMR spectrum, Fourier transform infrared spectrum, and DSC curve of the benzoxazine monomer prepared in this embodiment are shown below. Figure 1 , Figure 2 and Figure 3 As shown.

[0052] Depend on Figure 1 It can be seen that the chemical shifts of approximately 4.77 ppm and 3.57 ppm are characteristic peaks of the methylene group on the oxazine ring; Figure 2 1023cm -1 and 1352cm -1 The peak at this location is a characteristic absorption peak of the benzoxazine ring; Figure 3 The DSC curve shows that the peak curing exothermic temperature of the benzoxazine monomer is 232℃. In addition, the benzoxazine monomer is readily soluble in water at 50℃.

[0053] Example 2

[0054] Example 2 provides a method for preparing cementing stone based on aqueous benzoxazine resin, which is basically the same as the steps in Example 1, except that the phenolic source p-hydroxybenzaldehyde is replaced with polyoxin. The chemical structural formula of polyoxin is:

[0055] ;

[0056] The reactants were: 3.9039 g (0.01 mol) of polyvinyl jusin, 0.6004 g (0.01 mol) of urea, and 0.6006 g (0.02 mol) of paraformaldehyde. The yield reached 78%. The chemical reaction equation is as follows:

[0057] .

[0058] The DSC curve of the benzoxazine monomer obtained in this embodiment is shown in the figure below. Figure 4 As shown, by Figure 4 It can be seen that the peak curing exothermic temperature of the latent curing benzoxazine monomer prepared in this embodiment is 220℃, and benzoxazine can be dissolved in water at 50℃.

[0059] Example 3

[0060] This embodiment 3 provides a method for preparing cementing stone based on aqueous benzoxazine resin, which is basically the same as the steps in embodiment 1, except that the amine source is replaced with furfurylamine and the phenol source is replaced with arbutin.

[0061] The chemical structural formula of furfurylamine is: ;

[0062] The chemical structural formula of arbutin is: ;

[0063] The reactants were: 2.7225 g (0.01 mol) of arbutin, 0.97115 g (0.01 mol) of furfurylamine, and 0.6006 g (0.02 mol) of paraformaldehyde. The yield reached 81%. The chemical reaction equation is as follows:

[0064] .

[0065] The DSC curve of the benzoxazine monomer obtained in this embodiment is shown in the figure below. Figure 5 As shown, by Figure 5 It can be seen that the peak curing exothermic temperature of the latent curing benzoxazine monomer prepared in this embodiment is 197°C, and benzoxazine can be dissolved in water at 50°C.

[0066] Example 4

[0067] This embodiment 4 provides a method for preparing cementing stone based on aqueous benzoxazine resin, which is basically the same as the steps in embodiment 1, except that the amine source is replaced with furfurylamine and the phenol source is replaced with polyoxin.

[0068] The reactants were: 3.9039 g (0.01 mol) of Polygonum cuspidatum, 1.9423 g (0.02 mol) of furfurylamine, and 1.231 g (0.04 mol) of paraformaldehyde. The yield reached 78%. The chemical reaction equation is as follows:

[0069] .

[0070] The DSC curve of the benzoxazine monomer obtained in this embodiment is shown in the figure below. Figure 6 As shown, by Figure 6 It can be seen that the peak curing exothermic temperature of the latent curing benzoxazine monomer prepared in this embodiment is 224℃, and benzoxazine can be dissolved in water at 50℃.

[0071] Example 5

[0072] This embodiment 5 provides a method for preparing cementing stone based on aqueous benzoxazine resin, which is basically the same as the steps in embodiment 1, except that the phenol source is replaced with arbutin.

[0073] The reactants were: 5.445 g (0.02 mol) of arbutin, 0.6004 g (0.01 mol) of urea, and 1.231 g (0.04 mol) of paraformaldehyde. The yield was 74%. The chemical reaction equation is as follows:

[0074] .

[0075] The DSC curve of the benzoxazine monomer obtained in this embodiment is shown in the figure below. Figure 7 As shown, by Figure 7 It can be seen that the peak curing exothermic temperature of the latent curing type benzoxazine monomer prepared in this embodiment is 218℃, and benzoxazine can be dissolved in water at 50℃.

[0076] Comparative Example

[0077] This comparative example is basically the same as Example 1, except that no high-temperature resistant water-based benzoxazine monomer was added to verify the effect of benzoxazine monomer on improving cement strength.

[0078] It should be noted that the cementing stone prepared in Examples 1-5 above exhibits good fluidity at room temperature. When the amount of benzoxazine monomer added is 4%, its fluidity is 28 cm and its density is 1.89 g / cm³. 3 Its density is similar to that of conventional cement slurry.

[0079] To better understand the present invention, the cementing stone prepared in Examples 1-5 above was subjected to thickening and compressive strength tests. The test methods are as follows:

[0080] Test Example 1

[0081] Test Example 1 describes a cement slurry thickening time test. Laboratory thickening time test results indicate the time it takes for cement slurry to remain pumpable downhole. Laboratory test conditions should represent the time, temperature, and pressure experienced by the cement slurry during pumping. The equipment used is a pressurized thickener, the most commonly used of which consists of a cylindrical rotating slurry cup containing a stationary agitator assembly, all sealed within a high-pressure vessel capable of withstanding pressure and temperature. The slurry cup rotates at a speed of 150 r / min ± 15 r / min. The consistency of the cement slurry should be measured. The agitator and all slurry cup components in contact with the cement slurry should be made of corrosion-resistant materials. The space between the slurry cup and the inner wall of the high-pressure vessel should be completely filled with hydrocarbon oil. A supplementary instrument used for determining the cement slurry thickening time test employs a rotating agitator with a stationary slurry cup.

[0082] The test results are shown in Table 1:

[0083]

[0084] The thickening curve is from Figure 8 As shown, by Figure 8 As can be seen from the data in the table, the addition of water-based benzoxazine monomer to the cement slurry system does not affect the performance of the cement slurry itself, indicating that the cement slurry system can meet the actual cementing operation requirements.

[0085] Test Example 2

[0086] This test example 2 is a test of the compressive strength of cement grout. The test method is as follows:

[0087] Pour the prepared cement slurry into the prepared molds until they are about half full. After all molds are filled with cement slurry, tamp each sample about 30 times with a tamping rod. Stir the remaining cement slurry by hand to resuspend and mix it evenly, then fill each mold to overflowing, and tamp again using the same method. After tamping, scrape off any excess cement slurry from the top of the mold with a ruler, and place the cover plate on top of the mold. If the mold leaks slurry, discard the sample. At least three samples are required for each test.

[0088] After filling the mold and covering it, immediately place it in a pressure vessel with an initial temperature of 27℃±3℃. Then, heat and pressurize according to the test protocol. For specimens with a curing temperature higher than 90℃, stop heating and cool the specimen before its strength test. 45 minutes before the strength test, the specimen temperature should be reduced to 90℃ or lower, and the test pressure inside the curing vessel should be maintained during the cooling process. 45 minutes before the strength test, slowly release the pressure and remove the mold from the curing vessel. Then, immediately demold the specimen and place it in a water bath at a temperature of 27℃±3℃ until the strength test is conducted.

[0089] Remove the specimens from the water bath. Wipe each specimen clean to remove any loose material from the specimen surface that is in contact with the two support blocks of the testing machine.

[0090] Apply a load to the surface of the specimen that has been in contact with the mold plane. Place the specimen under the upper support block of the testing machine. Before testing each cubic specimen, ensure that the support block with the spherical base can tilt freely. No cushioning or stabilizing pads should be used. Appropriate safety measures and operating procedures should be followed when testing the specimens.

[0091] The strength test should be performed using a compressive strength testing machine. For specimens with an expected strength greater than 3.5 MPa, the loading rate should be 71.7 kN / min ± 7.2 kN / min. For a specimen of 2580.64 mm... 2 On the standard specimen surface, by adjusting the loading rate to move the pressure gauge pointer between 8.9 kN and 26.8 kN (pressure gauge reading) after 15 seconds, this loading rate can be achieved. For specimens with an expected strength equal to or less than 3.5 MPa, the loading rate should be 17.9 kN / min ± 1.8 kN / min. For a specimen with a diameter of 2580.64 mm... 2 On the standard specimen surface, the loading rate can be adjusted so that the pressure gauge pointer moves between 8.9 kN and 26.8 kN (pressure gauge reading) after 1 minute. The control components of the testing machine should not be adjusted during the specimen compression period until breakage.

[0092] The compressive strength is equal to the force required for the specimen to break divided by the minimum cross-sectional area in contact with the bearing plate of the compressive strength testing machine. Calculate the average compressive strength of all qualified specimens made from the same cement paste and tested at the same time, accurate to 0.1 MPa.

[0093] The compressive strength results are shown in Table 2:

[0094]

[0095] Compressive strength comparison chart by Figure 9 As shown, by Figure 9 As can be seen from the data in the table, the cement slurry systems with added water-based benzoxazine monomer, namely Examples 1-5, all showed varying degrees of improvement compared to the comparative examples without added water-based benzoxazine monomer. Among them, Example 1 showed a 39.48% increase in compressive strength, which is the preferred embodiment of the present invention, and also shows that the addition of water-based benzoxazine monomer has a significant effect on improving the compressive strength of cement slurry.

[0096] Various embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible subranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the range referred to.

[0097] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A set well cement based on an aqueous benzoxazine resin, characterized in that, The cement stone for well cementing is composed of 400-600 parts of quartz sand, 4-6 parts of a retarder, 4-6 parts of a fluid loss additive, 1-2 parts of a suspension stabilizer, 1-2 parts of a dispersant, 4-6 parts of the high-temperature-resistant water-based benzoxazine monomer and 40-50 parts of water; The high-temperature-resistant water-based benzoxazine monomer is prepared by Mannich reaction of a phenolic compound, a primary amine and formaldehyde; The phenolic compound is at least one of a glycosyl phenolic compound and a derivative thereof and a sulfonic acid phenolic compound and a derivative thereof; The primary amine is at least one of a monoamine and a diamine.

2. The cement stone of claim 1, wherein, The preparation method of the high-temperature-resistant water-based benzoxazine monomer is as follows: the phenolic compound, the primary amine and formaldehyde are added in a molar ratio of (1-1.2):(1-2.4):(2.2-4.2) at 90-120 DEG C by means of Mannich reaction, and the reaction is carried out for 12-24 hours to obtain the high-temperature-resistant water-based benzoxazine monomer.

3. The cement stone of claim 1, wherein, The structural formula of the high-temperature-resistant water-based benzoxazine monomer is as follows: or or or or or or or .

4. The cement stone of claim 1, wherein, The structural formula of the glycosyl phenolic compound and the derivative thereof is as follows: ； wherein R1is or or or or or or or or or or .

5. The cement stone of claim 1, wherein, The structural formula of the sulfonic acid phenolic compound and the derivative thereof is as follows: ； wherein R2 is or or or or or or or or or .

6. The cement stone of claim 1, wherein, The structural formula of the primary amine is as follows: or or or or or .

7. The cement stone of claim 1, wherein, The high-temperature-resistant water-based benzoxazine monomer has a curing peak temperature of 200-240 DEG C and a solubility of >100 g / L.

8. A method of producing a water-lime-set well cement stone based on the aqueous benzoxazine resin according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: 400-600 parts of quartz sand, 4-6 parts of a retarder, 4-6 parts of a fluid loss additive, 1-2 parts of a suspension stabilizer, 1-2 parts of a dispersant, 4-6 parts of the high-temperature-resistant water-based benzoxazine monomer and 40-50 parts of water are mixed to prepare a slurry, and a slurry body is obtained; The slurry body is stirred at 6000-8000 rpm for 40-60 seconds, then stirred at 3000-4000 rpm for 20-30 seconds, and then placed in a pressurized curing kettle, and the curing temperature is set to 150-240 DEG C and the curing time is set to 1-7 days to obtain the cement stone for well cementing.

9. The method of claim 8, wherein, The retarder is at least one of a hydroxyl carboxylate, a lignin sulfonate and a diethylene triamine pentaformal phosphonic acid; the fluid loss additive is at least one of an AMPS copolymer and a sulfonated phenolic aldehyde resin; the suspension stabilizer is at least one of an AMPS tackifying polymer and a synthetic hectorite; and the dispersant is at least one of a sulfonated styrene-maleic anhydride copolymer and an AMPS copolymer.

10. Application of the water-based benzoxazine resin-based cement stone for well cementing in deep well cementing at 150-210 DEG C and 70-100 MPa according to any one of claims 1-7.

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