A temperature-resistant high-toughness well cementing cement system and a preparation method thereof

Abstract

The application discloses a temperature-resistant high-strength and high-toughness well cementing cement system and a preparation method thereof. The temperature-resistant high-strength and high-toughness well cementing cement system comprises, in percentage by weight, low-heat portland cement: 41-56 wt%; granite waste: 5-10 wt%; strength modifier type I: 12-16 wt%; strength modifier type II: 22-24 wt%; toughness modifier: 2-4 wt%; high-temperature stabilizer: 2-3 wt%; and dispersant: 1-2 wt%. The temperature-resistant high-strength and high-toughness well cementing cement system has the characteristics of high temperature strength, high toughness, low permeability, good channeling prevention, excellent engineering performance and the like. In addition, a large amount of solid waste is used, so that the environmental pressure is reduced, and the temperature-resistant high-strength and high-toughness well cementing cement system is green, environment-friendly and low in cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas field development cementing materials, and particularly relates to a temperature-resistant high-toughness cementing cement system and a preparation method thereof. BACKGROUND

[0002] With the decline of the development potential of shallow oil and gas reservoirs, the development of oil and gas resources gradually develops in the direction of deep formation, unconventional oil and gas and marine oil and gas, the formation environment becomes more complex, and the exploitation difficulty increases. With the increase of well depth, the bottom hole temperature and pressure will be continuously improved, which puts forward higher requirements for cementing cement. Cement stone belongs to brittle material, and is easily affected by temperature, pressure, drilling, injection and other complex conditions in the downhole to produce microcracks and microannulus, which seriously affects the oil and gas well productivity, production life and safety.

[0003] Application No. 202210203763.0 discloses a long-term high-temperature-resistant and toughened cementing sand-cement composite material and a preparation method. The solid component includes cement, alumina, ultra-fine high-purity silica sand, suspending agent and toughening material according to weight fraction; the toughening material contains latex fiber toughening agent and nano graphene sheet. The liquid component is composed of water, nano iron oxide and oil well cement additive according to weight fraction. The invention compounding alumina, silica sand, toughening material and nano iron oxide colloid solution according to a certain proportion, supplemented by a certain proportion of liquid component, obtains a new type of high-temperature-resistant cementing cement system which can be applied in ultra-high temperature environment.

[0004] Application No. 202110219984.2 discloses a high-temperature-resistant and elastic-tough cement slurry system for shale oil and gas wells. The cement slurry system contains the following components by weight fraction: 100 parts of cement, 2-5 parts of toughening material, 4-10 parts of elastic material, 3-20 parts of reinforcing material, 10-45 parts of high-temperature strength stabilizer, 0-120 parts of density regulator, 0.5-1 part of dispersing agent, 2-4 parts of retarder, 3-7 parts of fluid loss reducer and 0.1-1 part of defoaming agent.

[0005] Application No. 201710512058.8 discloses an anti-high-temperature cement slurry system for ultra-deep wells. The cement slurry system includes the following components by weight fraction: 100 parts of cement, 6-18 parts of high-temperature fluid loss reducer, 25-40 parts of silica sand, 6-15 parts of high-temperature retarder, 3-5 parts of high-temperature stabilizer and 0.4-2 parts of dispersing agent. The high-temperature fluid loss reducer uses a copolymer fluid loss reducer with a maximum temperature resistance of 180-230 DEG C, and the high-temperature retarder uses a retarder with a maximum temperature resistance of 180-230 DEG C.

[0006] The application number 202110815046.9 discloses a high-temperature-resistant cementing cement system and a preparation method thereof. The cement system is composed of a solid component and a liquid component, and the weight ratio of the solid component and the liquid component is 1:(0.2-0.9), wherein the solid component contains 25-85wt% of cement, 4-60wt% of silica sand and 4-60wt% of fly ash, and the weight ratio of the silica sand and the fly ash is (0.0714-14):1; the liquid component contains water and additives.

[0007] In the above prior art, although certain progress has been made in the compressive strength decay and toughening of the cement slurry system, with the gradual deepening of well temperature, the existing cement slurry system cannot meet the requirements of cementing construction in super-high temperature environment. Therefore, it is urgent to develop a high-temperature-resistant cementing cement system with high strength and toughness to provide help for the exploration and development of deep oil and gas resources in China. SUMMARY

[0008] In order to overcome the defects and deficiencies in the above prior art, the present application provides a high-temperature-resistant cementing cement system with high strength and toughness and a preparation method thereof, which solves the problems of strength decay and insufficient toughness of the cement stone under high temperature conditions.

[0009] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0010] On the one hand, a high-temperature-resistant cementing cement system with high strength and toughness is provided, which comprises the following raw materials in weight percentage:

[0011] Low-heat Portland cement: 41-56wt%;

[0012] Granite waste: 5-10wt%;

[0013] Strength modifier I: 12-16wt%;

[0014] Strength modifier II: 22-24wt%;

[0015] Toughness modifier: 2-4wt%;

[0016] High-temperature stabilizer: 2-3wt%;

[0017] Dispersant: 1-2wt%.

[0018] Further, the SiO2 content of the granite waste is ≥72wt%, the Al2O3 content is ≥12wt%, and the powder particle size is 325 mesh.

[0019] Further, the strength modifier I is a mixture of waste glass powder, tungsten tailings powder and fused quartz sand in a mass ratio of (1-2):(1-2):1. Further, the strength modifier I is a mixture of waste glass powder, tungsten tailings powder and fused quartz sand in a mass ratio of (1-2):(1-2):1.

[0020] Further, the SiO2 content of the waste glass powder is ≥75wt%, the particle size of the powder is 800 mesh; the SiO2 content of the tungsten tailings powder is ≥70wt%, the Al2O3 content is ≥10wt%, and the particle size of the powder is 325 mesh; the SiO2 content of the fused quartz sand is ≥99wt%, and the particle size of the powder is 325 mesh.

[0021] The main components of the waste glass powder, the fused quartz sand and the tungsten tailings powder used by the strength modifier I are crystalline or amorphous silicon dioxide, and the main components of the granite waste and the strength modifier II contain active silicon dioxide and aluminum oxide, which jointly reduce the calcium-silicon ratio of the cement system, greatly reduce the amount of silica sand by using solid waste to replace silica sand, and are green and environmentally friendly; on the other hand, by controlling the hydration rate through different crystal forms of silicon dioxide, the generation of high-temperature hydration products is regulated, and active aluminum ions are introduced under the dissociation of the strength modifier II to promote the generation of temperature-resistant silicate minerals, thereby improving the strength and temperature resistance of the system.

[0022] Further, the strength modifier II is a mixture of strength stabilizing material A, strength stabilizing material B and crystal form inducing material in a mass ratio of 7:1:2, and the preparation method is as follows:

[0023] S11, after mixing the strength stabilizing material A and the crystal form inducing material, placing them in a sealed stirring tank, using anhydrous ethanol as the solvent, liquid-solid ratio is 5:1, stirring at room temperature for 48h, forming slurry A;

[0024] S12, solid-liquid separation and drying of the slurry A to obtain powder A;

[0025] S13, uniformly mixing the powder A and the strength stabilizing material B through a pneumatic mixing device to obtain the strength modifier II.

[0026] Further, the strength stabilizing material A is a mixture of waste siliceous shale, biomass slag and coal gasification slag in a mass ratio of 2:1:1;

[0027] Preferably, the SiO2 content of the waste siliceous shale is ≥85wt%, and the waste siliceous shale is crushed and ground to form a powder, and the particle size of the powder is 600 mesh;

[0028] Preferably, the SiO2 content of the biomass slag is ≥65wt%, and the Al2O3 content is ≥15wt%, the biomass slag is dried and ground to form a powder, and the particle size of the powder is 600 mesh;

[0029] Preferably, the SiO2 content of the coal gasification slag is ≥55wt%, the Al2O3 content is ≥20wt%, and the carbon content is ≥10wt%, and the particle size is 375 mesh;

[0030] The strength stabilizing material B is nanoclay, waste magnesium brick powder and forsterite powder mixed in a mass ratio of 1:1:2;

[0031] Preferably, the SiO2 content of the nanoclay is ≥47wt%, and the Al2O3 content is ≥40wt%;

[0032] Preferably, the MgO content of the waste magnesium brick powder is ≥90wt%, and the powder particle size is 325 mesh;

[0033] Preferably, the SiO2 content of the forsterite powder is ≥40wt%, the MgO content is ≥50wt%, and the powder particle size is <600 mesh;

[0034] The crystal form inducing material is waste inorganic thermal insulation material, preferably waste thermal insulation brick or waste thermal insulation board;

[0035] More preferably, the components of the waste thermal insulation brick or waste thermal insulation board include xonotlite, tobermorite and silicon dioxide; the waste thermal insulation brick or waste thermal insulation board is crushed to form a powder, and the powder particle size is <10μm.

[0036] The strength modifier II of the present application uses solid waste with main components of SiO2 and Al2O3, which ensures the calcium-silicon ratio and high-temperature strength of the cement paste system, greatly reduces the use of silica sand, and can improve the high-temperature compressive strength of the cement stone and ensure that the compressive strength of the cement stone does not decline in a high-temperature environment.

[0037] Specific principles are as follows: (1) the strength stabilizing material B and the strength stabilizing material A jointly reduce the calcium-silicon ratio of the cement system, and can form Mg(OH)2 in the high-temperature hydration process of the cement, so that the cement stone has certain expansibility; in addition, the filling and heterogeneous nucleation effect of the nano clay can refine the pore structure and reduce the porosity, and the synergistic effect of the forsterite powder with excellent temperature resistance can greatly reduce the permeability of the cement stone, strengthen the density and interface cementation capacity of the cement stone, and further improve the anti-channeling capacity and mechanical properties of the cement stone; (2) the crystal type inducing material can be used as a crystal seed material in the cement hydration process, induce the cement hydration products to quickly crystallize to form more tobermorite and thomsonite at high temperature, and further improve the high-temperature resistance of the cement stone and avoid the strength decline of the cement stone; (3) the crystal type inducing material is loaded in the pore inside and surface of the strength stabilizing material A due to the porous and large specific surface area characteristics of the strength stabilizing material A. When the cement hydration products react with the active ions such as silicon and aluminum released by the strength stabilizing material A and the strength stabilizing material B, the formation of tobermorite and thomsonite is greatly accelerated due to the existence of the crystal type inducing material, and the formation of silicate and aluminate minerals and aluminum products is induced, further enhancing the high-temperature resistance of the cement stone and avoiding the strength decline. In addition, the small amount of carbon powder existing in the strength stabilizing material A can not only synergistically fill the pores with the strength stabilizing material B, but also provide a crystallization point for the hydration products to promote hydration.

[0038] Further, the toughness modifier is a mixture of kyanite powder, expanded graphite and phenyl silicone rubber powder in a mass ratio of 10:1:1, which is uniformly mixed and then modified by plasma.

[0039] Further, the purity of the kyanite powder is greater than 99wt%, and the particle size of the powder is 325 mesh; the particle size of the expanded graphite is 80 mesh; the purity of the phenyl silicone rubber powder is greater than 99wt%, and the particle size of the powder is 325 mesh.

[0040] Further, the high-temperature stabilizer is a mixture of clay and hectorite; and the dispersant is an aldehyde ketone condensate.

[0041] Preferably, the clay is one or both of chlorite and hydrous aluminosilicate.

[0042] On the other hand, a preparation method of a high-temperature-resistant high-strength and toughness well cementing cement system is provided, which comprises mixing low-heat cement, granite waste, strength modifier I, strength modifier II, toughness modifier, high-temperature stabilizer and dispersant in proper amounts to obtain the high-temperature-resistant high-strength and toughness well cementing cement system.

[0043] Compared with the prior art, the present application has the following beneficial effects:

[0044] 1. The temperature-resistant high-toughness well cementing cement system of the present application has the characteristics of high temperature strength, high toughness, low permeability, good channeling prevention, excellent engineering performance, etc. In addition, a large amount of solid waste is used, which reduces the environmental pressure and is green, environmentally friendly and low in cost.

[0045] 2. The present application improves the high temperature resistance of the cement stone by using strength modifier I and strength modifier II in combination. The main components of the waste glass powder, fused quartz sand and tungsten tailings powder used in the strength modifier I are crystalline or amorphous silicon dioxide, and the main components of the strength modifier II also contain active silicon dioxide and aluminum oxide. Under the joint action of the two, on the one hand, the calcium-silicon ratio of the cement system is reduced; on the other hand, the hydration rate is controlled by different crystal forms of silicon dioxide, thereby regulating the generation of high temperature hydration products, and active aluminum ions are introduced under the action of the strength modifier II, which can promote the generation of temperature-resistant silicate minerals, improve the strength and temperature resistance of the system.

[0046] 3. The toughness modifier of the present application has excellent high temperature resistance. The combination of inorganic fibrous material (sillimanite powder), rubber elastic particles (phenyl silicone rubber powder) and flexible particles (expanded graphite) and the surface modification not only increase the specific surface area and roughness of the toughness modifier, but also increase the polar groups on the surface of the toughness modifier. This enhances the compatibility of the toughness modifier with the cement stone, and the cement hydration product can adhere to the surface of the toughness modifier, so that the interfacial cementing strength in the interfacial transition zone is enhanced, thereby improving the mechanical properties of the cement stone. Under the synergistic effect of the components and the modification, not only the elastic toughness and impact resistance of the cement stone are enhanced, but also the compressive strength of the cement stone is improved. In addition, the crystal form inducing material in the strength modifier II has certain inorganic fibers, which can work together with the toughness modifier to further improve the elastic toughness and impact resistance of the cement stone. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with reference to the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0048] In the following examples, the low-heat portland cement is provided by Jiahua Special Cement Co., Ltd., the high-temperature retarder is a diethylene triamine penta-methylene phosphonic acid organic acid, and the high-temperature fluid loss additive is a 2-acrylamido-2-methylpropane sulfonic acid polymer. Unless otherwise specified in the examples, all percentages are by weight.

[0049] Example 1

[0050] As a preferred embodiment of the present application, the specific components of the well cementing system with high temperature resistance, high strength and high toughness in this embodiment are shown in Table 1.

[0051] Table 1

[0052] Raw materials Weight ratio (%) Low-heat Portland cement 41 Granite waste 10 Strength modifier Type I 16 Strength modifier Type II 24 Toughness modifier 4 High-temperature stabilizer 3 Dispersant 2

[0053] The strength modifier I in this embodiment is a mixture of waste glass powder, tungsten tailings powder and fused quartz sand in a mass ratio of 1:1:1.

[0054] The strength modifier II in this embodiment is a mixture of strength stabilizing material A, strength stabilizing material B and crystal form inducing material in a mass ratio of 7:1:2.

[0055] The toughness modifier in this embodiment is a mixture of sillimanite powder, expanded graphite and phenyl silicone rubber powder in a mass ratio of 10:1:1, which is then modified by plasma.

[0056] According to Table 1, the low-heat cement, granite waste, strength modifier I, strength modifier II, toughness modifier, high-temperature stabilizer and dispersant are mixed uniformly to obtain the well cementing system 1# with high temperature resistance, high strength and high toughness.

[0057] Example 2

[0058] As a preferred embodiment of the present application, the specific components of the well cementing system with high temperature resistance, high strength and high toughness in this embodiment are shown in Table 2.

[0059] Table 2

[0060] Raw materials Weight ratio (%) Low-heat Portland cement 48 Granite waste 7 Strength modifier Type I 14 Strength modifier Type II 23 Toughness modifier 3 High-temperature stabilizer 3 Dispersant 2

[0061] The strength modifier I in this embodiment is a mixture of waste glass powder, tungsten tailings powder and fused quartz sand in a mass ratio of 1:1:1.

[0062] The strength modifier II in this embodiment is a mixture of strength stabilizing material A, strength stabilizing material B and crystal form inducing material in a mass ratio of 7:1:2.

[0063] The toughness modifier in this embodiment is a mixture of sillimanite powder, expanded graphite and phenyl silicone rubber powder in a mass ratio of 10:1:1, which is then modified by plasma.

[0064] According to Table 2, the low-heat cement, granite waste, strength modifier I, strength modifier II, toughness modifier, high-temperature stabilizer and dispersant are mixed uniformly to obtain the well cementing system 2# with high temperature resistance, high strength and high toughness.

[0065] Example 3

[0066] As a preferred embodiment of the present application, the specific components of the well cementing system with high temperature resistance, high strength and high toughness of the embodiment are shown in Table 3.

[0067] Table 3

[0068]

[0069]

[0070] The strength modifier I of the embodiment is a mixture of waste glass powder, tungsten tailings powder and fused quartz sand in a mass ratio of 1:1:1.

[0071] The strength modifier II of the embodiment is a mixture of strength stabilizing material A, strength stabilizing material B and crystal form inducing material in a mass ratio of 7:1:2.

[0072] The toughness modifier of the embodiment is a mixture of sillimanite powder, expanded graphite and phenyl silicone rubber powder in a mass ratio of 10:1:1, which is then modified by plasma.

[0073] According to Table 3, the low-heat cement, granite waste, strength modifier I, strength modifier II, toughness modifier, high-temperature stabilizer and dispersant are mixed uniformly to obtain the well cementing system 3# with high temperature resistance, high strength and high toughness.

[0074] Example 4

[0075] As a preferred embodiment of the present application, the specific components of the well cementing system with high temperature resistance, high strength and high toughness of the embodiment are shown in Table 4.

[0076] Table 4

[0077] Raw materials Weight ratio (%) Low-heat Portland cement 56 Granite waste 5 Strength modifier Type I 12 Strength modifier Type II 22 Toughness modifier 2 High-temperature stabilizer 2 Dispersant 1

[0078] The strength modifier I of the embodiment is a mixture of waste glass powder, tungsten tailings powder and fused quartz sand in a mass ratio of 1:2:1.

[0079] The strength modifier II of the embodiment is a mixture of strength stabilizing material A, strength stabilizing material B and crystal form inducing material in a mass ratio of 7:1:2.

[0080] The toughness modifier of the embodiment is a mixture of sillimanite powder, expanded graphite and phenyl silicone rubber powder in a mass ratio of 10:1:1, which is then modified by plasma.

[0081] According to Table 4, the low-heat cement, granite waste, strength modifier I, strength modifier II, toughness modifier, high-temperature stabilizer and dispersant are mixed uniformly to obtain the well cementing system 4# with high temperature resistance, high strength and high toughness.

[0082] Comparative Example 1

[0083] The comparative example is a conventional high-temperature cementing cement, and the specific components are G-grade oil well cement 57wt%, silica sand 40wt%, high-temperature stabilizer 2wt%, and dispersant 1wt%. The water-cement ratio is 0.44.

[0084] Comparative Example 2

[0085] The comparative example is the same as Example 1, except that the strength modifier I does not contain fused quartz sand, and a cementing cement system 1* is obtained.

[0086] Comparative Example 3

[0087] The comparative example is the same as Example 1, except that the strength modifier II does not contain a crystal form inducing material, and a cementing cement system 2* is obtained.

[0088] Comparative Example 4

[0089] The comparative example is the same as Example 1, except that the toughness modifier does not contain phenyl silicone rubber powder, and a cementing cement system 3* is obtained.

[0090] Test Example

[0091] The cement slurry is prepared according to the GB / T19139 standard, and the liquid-solid ratio is 0.44. The engineering performance of the cement slurry prepared by the temperature-resistant high-strength and toughness cementing cement system obtained in Example 1 is evaluated, and the 210℃ experiment is carried out according to the following formula. The formula composition and test results are shown in Table 5.

[0092] Table 5

[0093]

[0094]

[0095] According to the data in Table 5, it can be found that the cement slurry prepared by the temperature-resistant high-strength and toughness cementing cement system has a water loss of less than 50ml, an upper and lower density difference of less than 0.04g / cm 3 , good adaptability of the system to additives (high-temperature retarder and high-temperature fluid loss reducer), adjustable thickening time, SPN value of anti-channeling coefficient less than 1, good anti-channeling performance, meeting the construction requirements in high-temperature environment, and being conducive to improving the safety of high-temperature cementing operation construction.

[0096] The cement paste prepared according to GB / T19139 standard, the liquid-solid ratio is 0.44. The cement paste prepared by the cement system obtained in the above embodiment 1 to embodiment 4 and each comparative example is poured into a copper mold for molding and then placed in a high-temperature curing oven for curing to obtain a cement stone, the curing temperature is 260 DEG C, the curing period is 2d, 7d, 28d, and the compressive strength and permeability of the cement stone are tested, and the test results are shown in table 6. The cement stone after curing molding is cored, and then the triaxial mechanical property test is carried out, and the test results are shown in table 7.

[0097] Table 6

[0098]

[0099] From the data in table 6, compared with comparative example 1, the cement paste prepared by the cement system of embodiment 1 to embodiment 4 has a compressive strength greater than 40MPa after curing in a 260 DEG C environment for a certain period of time, and does not show a decline phenomenon; the permeability is less than 0.20mD, indicating that the internal structure has high compactness. It can be known from comparative example 2 to comparative example 4 that the present application has the effect of improving the compressive strength and high temperature resistance of the cement stone, and the components have a synergistic effect, and the absence of any one cannot achieve the expected effect of the present application.

[0100] Table 7

[0101]

[0102] From the data in table 7, the present application can effectively reduce the elastic modulus of the cement stone in a high temperature environment, indicating that it has good toughness, and can effectively solve the problem of insufficient toughness of the cement stone in a high temperature environment. In addition, compared with the results of comparative example 2 to comparative example 4, the components in the present application have a synergistic effect, and the absence of any one cannot achieve the expected effect of the present application.

[0103] To sum up, the present application can improve the density and strength of the cement stone, effectively inhibit the decline of the strength of the cement stone, also reduce the elastic modulus of the cement stone under high temperature environment, improve the toughness of the cement stone under high temperature, and the components have synergistic effect, and any one of the components cannot achieve the expected effect. Finally, it should be pointed out that: the above examples are only the preferred embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not limit them, and of course, they are not limit the patent scope of the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: the technical solutions recorded in the foregoing examples can still be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application; that is to say, any modification or polishing without substantial significance in the main design idea and spirit of the present application, and the technical problems solved are still consistent with the present application, which should be included in the protection scope of the present application; in addition, the technical solutions of the present application are directly or indirectly applied to other related technical fields, which are also included in the patent protection scope of the present application.

Claims

1. A high-temperature-resistant and high-strength cementing system, characterized in that: The following raw materials are included in weight percentage: Low-heat Portland cement: 41~56wt%; Granite waste: 5~10wt%; Strength modifier type I: 12~16wt%; Strength modifier type II: 22~24wt%; Toughness modifier: 2~4wt%; High temperature stabilizer: 2~3wt%; Dispersant: 1~2wt%; The strength modifier type I is prepared by mixing waste glass powder, tungsten tailings powder and fused quartz sand in a mass ratio of (1-2):(1-2):1; The strength modifier type II is a mixture of strength stabilizing material A, strength stabilizing material B and crystal form inducing material in a mass ratio of 7:1:2; The strength stabilizing material A is made by mixing waste siliceous shale, biomass slag and coal gasification slag in a mass ratio of 2:1:1; The strength stabilizing material B is a mixture of nano clay, waste magnesia brick powder and forsterite powder in a mass ratio of 1:1:2; The crystal form inducing material is a waste inorganic thermal insulation material.

2. A high-temperature-resistant and high-strength cementing system according to claim 1, characterized in that: The SiO2 content of the granite waste is ≥72wt%, the Al2O3 content is ≥12wt%, and the powder particle size is 325 mesh.

3. The temperature-resistant and high-strength cementing system according to claim 1, characterized in that: The SiO2 content of the waste glass powder is ≥75wt%, and the powder particle size is 800 mesh; the SiO2 content of the tungsten tailings powder is ≥70wt%, the Al2O3 content is ≥10wt%, and the powder particle size is 325 mesh; the SiO2 content of the fused quartz sand is ≥99wt%, and the powder particle size is 325 mesh.

4. The temperature-resistant and high-strength cementing system according to claim 1, characterized in that: The preparation method of the strength modifier type II is as follows: S11, mixing the strength stabilizing material A and the crystal form inducing material and placing them in a sealed stirring tank, using anhydrous ethanol as a solvent with a liquid-to-solid ratio of 5:1, and stirring at room temperature for 48 hours to form slurry A; S12, performing solid-liquid separation and drying on slurry A to obtain powder A; S13. Powder A and strength stabilizing material B are mixed evenly by a pneumatic mixing device to obtain strength modifier type II.

5. The temperature-resistant and high-strength cementing system according to claim 1, characterized in that: The SiO2 content of the waste siliceous shale is ≥85wt%, and the waste siliceous shale is crushed and ground to form powder with a particle size of 600 mesh.

6. The temperature-resistant and high-strength cementing system according to claim 1, characterized in that: The SiO2 content of the biomass slag is ≥65wt%, and the Al2O3 content is ≥15wt%. The biomass slag is dried and ground to form a powder with a particle size of 600 mesh.

7. The temperature-resistant, high-strength and toughness cementing system according to claim 1, characterized in that: The coal gasification slag has a SiO2 content of ≥55wt%, an Al2O3 content of ≥20wt%, a carbon content of ≥10wt%, and a particle size of 375 meshes.

8. The temperature-resistant, high-strength and toughness cementing system according to claim 1, characterized in that: The SiO2 content of the nanoclay is ≥47wt%, and the Al2O3 content is ≥40wt%.

9. The temperature-resistant, high-strength and toughness cementing system according to claim 1, characterized in that: The MgO content of the waste magnesia brick powder is ≥90wt%, and the powder particle size is 325 mesh.

10. The temperature-resistant and high-strength cementing system according to claim 1, characterized in that: The SiO2 content of the forsterite powder is ≥40wt%, the MgO content is ≥50wt%, and the powder particle size is <600 mesh.

11. The temperature-resistant, high-strength and toughness cementing system according to claim 1, characterized in that: The waste inorganic thermal insulation material is thermal insulation brick waste or thermal insulation board waste.

12. The temperature-resistant, high-strength and toughness cementing system according to claim 11, characterized in that: The components of the insulation brick waste and insulation board waste include xonotlite, tobermorite and silicon dioxide; the insulation brick waste or insulation board waste is crushed into powder with a particle size of less than 10 μm.

13. The temperature-resistant, high-strength and toughness cementing system according to claim 1, characterized in that: The toughness modifier is prepared by uniformly mixing sillimanite powder, expanded graphite, and phenyl silicone rubber powder in a mass ratio of 10:1:1 and then subjecting the mixture to plasma modification.

14. The temperature-resistant, high-strength and toughness cementing system according to claim 13, characterized in that: The purity of the sillimanite powder is greater than 99wt%, and the powder particle size is 325 mesh; the particle size of the expanded graphite is 80 mesh; the purity of the phenyl silicone rubber powder is greater than 99wt%, and the powder particle size is 325 mesh.

15. The temperature-resistant, high-strength and toughness cementing system according to claim 1, characterized in that: The high-temperature stabilizer is a mixture of clay and hectorite; and the dispersant is an aldehyde-ketone condensate.

16. The temperature-resistant, high-strength and toughness cementing system according to claim 15, characterized in that: The clay is one or both of chlorite and allophane.

17. The method for preparing a temperature-resistant, high-strength and toughness cementing system according to any one of claims 1 to 16, characterized in that: Low-heat cement, granite waste, strength modifier type I, strength modifier type II, toughness modifier, high-temperature stabilizer and dispersant of various masses are uniformly mixed to obtain a temperature-resistant, high-strength and toughness cementing cement system.

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