A high-temperature resistant micro-expansion toughening and lightening material for cementing cement and its preparation method

Abstract

The present invention discloses a high-temperature resistant, micro-expansion toughening and lightening material for cementing and a preparation method thereof. The material comprises, by weight percentage, 50-70% hollow microspheres, 10-20% reinforcing material, 10-20% laterite nickel slag, and 10% heat-resistant elastic material. The hollow microspheres are a mixture of borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres. The reinforcing material is a mixture of pseudo-boehmite, nano-boehmite, and protein shale powder. The heat-resistant elastic material is a modified mixture of waste ceramic tile powder, polycarbonate, and polyphenylene sulfide. The high-temperature resistant, micro-expansion toughening and lightening material for cementing has the characteristics of high temperature resistance, light weight, high strength, good micro-expansion, and good toughness.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas resource development, and particularly relates to a high-temperature resistant micro-expansion toughening and lightening material for cementing cement and a preparation method thereof. Background Art

[0002] As oil and gas field development continues into complex reservoirs, challenges such as high temperature, high pressure, channeling, and leakage are becoming increasingly prominent. Due to the complex formation pressure system, multiple leak-prone strata exist. For sealing sections with low pressure coefficients, low-density cement slurry is required to balance the pressure and prevent leakage during injection. Furthermore, the cement paste is exposed to high temperature and high pressure, leading to high-temperature strength degradation.

[0003] In view of the above difficulties, it is particularly important to develop a high-temperature resistant lightening material to solve the usage problems of high-temperature low-density cement slurry system. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-temperature resistant micro-expansion toughening and lightening material for cementing cement and a preparation method thereof, so as to at least solve some of the above technical problems.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A high-temperature resistant micro-expansion toughening and lightening material for cementing cement, the raw materials of which include the following components in percentage by weight:

[0007] Hollow microspheres: 50-70wt.%;

[0008] Reinforcement material: 10-20wt.%;

[0009] Laterite nickel slag: 10-20wt.%;

[0010] Heat-resistant elastic material: 10wt.%;

[0011] The hollow microspheres are a mixture of borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres;

[0012] The reinforcing material is formed by mixing pseudo-boehmite, nano-boehmite and protein shale powder. The heat-resistant elastic material is formed by mixing and modifying waste tile powder, polycarbonate and polyphenylene sulfide.

[0013] In the high-temperature resistant micro-expansion toughening and lightening material for cementing cement of the present invention, the hollow microspheres account for 50 to 70 wt.% in the raw materials, for example, 50 wt.%, 51 wt.%, 52 wt.%, 53 wt.%, 54 wt.%, 55 wt.%, 56 wt.%, 57 wt.%, 58 wt.%, 59 wt.%, 60 wt.%, 61 wt.%, 62 wt.%, 63 wt.%, 64 wt.%, 65 wt.%, 66 wt.%, 67 wt.%, 68 wt.%, 69 wt.%, and 70 wt.%.

[0014] The high-temperature resistant micro-expansion toughening and lightening material for cementing cement of the present invention has a reinforcing material content of 10 to 20 wt.% in the raw materials, for example, 10 wt.%, 11 wt.%, 12 wt.%, 13 wt.%, 14 wt.%, 15 wt.%, 16 wt.%, 17 wt.%, 18 wt.%, 19 wt.%, and 20 wt.%.

[0015] In the high-temperature resistant micro-expansion toughening and lightening material for cementing cement of the present invention, the laterite nickel slag accounts for 10 to 20 wt.% in the raw materials, for example, 10 wt.%, 11 wt.%, 12 wt.%, 13 wt.%, 14 wt.%, 15 wt.%, 16 wt.%, 17 wt.%, 18 wt.%, 19 wt.%, and 20 wt.%.

[0016] In some embodiments of the present invention, a high-temperature resistant micro-expansion toughening and lightening material for cementing cement comprises the following components in percentage by weight:

[0017] Hollow microspheres: 55-65wt.%;

[0018] Reinforcement material: 15-20wt.%;

[0019] Laterite nickel slag: 10-15wt.%;

[0020] Heat-resistant elastic material: 10wt.%;

[0021] The hollow microspheres are formed by mixing borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres in a mass ratio of (2-4): (6-8); more preferably, they are mixed in a mass ratio of 3:7;

[0022] The reinforcing material is prepared by mixing pseudo-boehmite, nano-boehmite and protein shale powder in a mass ratio of (2-3):(2-3):5;

[0023] The temperature-resistant elastic material is made of waste tile powder, polycarbonate and polyphenylene sulfide in a mass ratio of (0.5-1.5):(0.5-3):(5-9), and is melt-blended, granulated, cooled, crushed, and then modified by low-temperature plasma; more preferably, the mass ratio of waste tile powder, polycarbonate and polyphenylene sulfide is 1:2:7.

[0024] Furthermore, the borosilicate hollow glass microspheres have a particle size of 20 to 80 μm and a compressive strength of 30 to 90 MPa.

[0025] Furthermore, the particle size of the aluminum silicate hollow ceramic microspheres is 10 to 200 μm, and the compressive strength is ≥350 MPa.

[0026] Furthermore, the purity of the pseudo-boehmite is greater than 90 wt.%, and the average particle size is 5 to 10 μm.

[0027] Furthermore, the nano-boehmite is in the form of white powder with a purity greater than 98 wt.% and a crystal particle size of 10 to 15 nm.

[0028] Furthermore, the particle size of the protein shale powder is ≥1200 mesh, the main component of the protein shale powder is amorphous active silicon dioxide, and the SiO2 content thereof is ≥90wt.%.

[0029] Furthermore, the particle size of the laterite nickel slag is ≥325 mesh, and the main chemical components of the laterite nickel slag are SiO2, Al2O3, CaO and MgO, with the SiO2 content being ≥50wt.% and the MgO content being ≥20wt.%.

[0030] Furthermore, the particle size of the waste tile powder is ≥800 mesh, and the main chemical components of the waste tile powder are SiO2 and Al2O3, with the SiO2 content being ≥75wt.% and the Al2O3 content being ≥15wt.%.

[0031] The present invention also provides a preparation method of a high-temperature resistant micro-expansion toughening and lightening material for cementing cement, which is applied to the high-temperature resistant micro-expansion toughening and lightening material for cementing cement, comprising pneumatically homogenizing and mixing hollow microspheres, reinforcing materials, laterite nickel slag and temperature-resistant elastic materials in various proportions to obtain the high-temperature resistant micro-expansion toughening and lightening material for cementing cement.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The high temperature resistant micro expansion toughening and lightening material for cementing cement of the present invention has the characteristics of high temperature resistance, light weight, high strength, micro expansion and good toughness. The hollow microspheres are mixed with borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres. On the one hand, the density of borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres is small, which is 0.4-0.6g / cm 3 , 0.3~0.5g / cm 3 , can be used as a lightening material to reduce material density; secondly, according to the difference in compressive strength between the two, by adjusting the mixing ratio of the two, it can adapt to different pressure environments, reduce the breakage of microbeads caused by high temperature and high pressure, improve material stability and control costs; thirdly, according to the difference in particle size between the two, through particle grading pairing, the density of the material can be increased, thereby improving the material's lightening effect and pressure-bearing capacity.

[0034] 2. The reinforcing material described in the present invention, through the combined action of crystalline and amorphous silica (protein shale), crystalline hydrated alumina (nanoboehmite), and gel hydrated alumina (pseudoboehmite), not only increases the heat resistance of cement paste but also promotes the early hydration process of cement. Furthermore, the nano- and ultrafine materials have large specific surface areas and can serve as nucleation sites during the hydration process, accelerating the hydration rate of the cementitious material. Pseudoboehmite and nanoboehmite participate in the cement hydration reaction, increasing the aluminum content of the hydration product; protein shale powder participates in the cement hydration reaction, increasing the silicon content. The synergistic action of these components reduces the calcium-silicon ratio (Ca / Si), promotes the formation of a CASH product with better heat resistance, and thus improves the high-temperature strength stability of the cement slurry system.

[0035] 3. The present invention improves the high-temperature toughness, anti-gas channeling and density of cement stone under the action of laterite nickel slag, elastic particles (heat-resistant elastic material) and ultrafine particles (reinforcement material). The main components of laterite nickel slag are SiO2 and MgO. While synergistically improving the temperature resistance of the material with the reinforcing material, it can also participate in the cement hydration reaction to form Mg(OH)2 crystals and produce micro-expansion, effectively compensating for the shrinkage of cement slurry in high temperature and high pressure environments, improving the bonding quality and preventing gas channeling. The heat-resistant elastic material is mixed with waste tile powder, polycarbonate and polyphenylene sulfide by melt blending, which also improves the toughness, strength and roughness of the elastic material. On the one hand, polyphenylene sulfide has poor toughness, and its toughness can be effectively improved by adding polycarbonate with strong toughness and good compatibility to modify it; on the other hand, the main components of waste tile powder are SiO2 and Al2O3, and it has a smaller particle size; it can play a role of heterogeneous nucleation in the crystallization process of polyphenylene sulfide, while improving the strength and surface roughness of polyphenylene sulfide, and can improve the bonding strength between it and cement hydration products. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a thickening test curve of the cementing slurry system prepared in Example 1 of the present invention.

[0037] Figure 2 This is a thickening test curve of the cementing slurry system prepared in Example 2 of the present invention.

[0038] Figure 3 This is a thickening test curve of the cementing slurry system prepared in Example 3 of the present invention.

[0039] Figure 4 This is a thickening test curve of the cementing slurry system prepared in Example 4 of the present invention.

[0040] Figure 5 This is a thickening test curve of the cementing slurry system prepared in Example 5 of the present invention.

[0041] Figure 6 This is a thickening test curve of the cementing slurry system prepared in Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0043] The following examples all prepared cement slurries according to GB / T19139. Grade G oil well cement was provided by Jiahua Special Cement Co., Ltd., and the high-temperature retarder and high-temperature fluid loss additive were provided by Sichuan Xuran Hongchen New Materials Co., Ltd. The high-temperature retarder was an AMPS polymer, and the high-temperature fluid loss additive was a 2-acrylamido-2-methylpropanesulfonic acid polymer. The proportions of Grade G oil well cement, high-temperature retarder, high-temperature fluid loss additive, and high-temperature resistant micro-expansion toughening and lightening material used in the following examples were identical.

[0044] The borosilicate hollow glass microspheres used in the embodiments of the present invention have a particle size of 20 to 80 μm and a compressive strength of 30 to 90 MPa.

[0045] The aluminum silicate hollow ceramic microspheres used in the embodiment of the present invention have a particle size of 10 to 200 μm and a compressive strength of ≥350 MPa.

[0046] The pseudo-boehmite used in the embodiment of the present invention has a purity of >90 wt.% and an average particle size of 5 to 10 μm.

[0047] The nano-boehmite used in the embodiment of the present invention is in the form of white powder with a purity greater than 98 wt.% and a crystal particle size of 10 to 15 nm.

[0048] The particle size of the protein shale powder used in the embodiment of the present invention is ≥1200 mesh, and the main component of the protein shale powder is amorphous active silicon dioxide, and its SiO2 content is ≥90wt.%.

[0049] The particle size of the laterite nickel slag used in the embodiment of the present invention is ≥325 mesh, and the main chemical components of the laterite nickel slag are SiO2, Al2O3, CaO and MgO, with a SiO2 content of ≥50wt.% and a MgO content of ≥20wt.%.

[0050] The particle size of the waste tile powder used in the embodiment of the present invention is ≥800 mesh, and the main chemical components of the waste tile powder are SiO2 and Al2O3, with the SiO2 content being ≥75wt.% and the Al2O3 content being ≥15wt.%.

[0051] Example 1

[0052] As a preferred embodiment of the present invention, this embodiment discloses a high-temperature resistant micro-expansion toughening and lightening material for cementing cement, the specific composition of which is shown in Table 1.

[0053] Table 1

[0054] Components Weight percentage (wt.%) hollow microspheres 50 Reinforcement materials 20 Laterite nickel slag 20 Heat-resistant elastic material 10

[0055] In this embodiment, the hollow microspheres are formed by mixing borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres in a mass ratio of 3:7.

[0056] In this embodiment, the reinforcing material is formed by mixing pseudo-boehmite, nano-boehmite and protein shale powder in a mass ratio of 2:3:5.

[0057] In this embodiment, the temperature-resistant elastic material is made of waste tile powder, polycarbonate and polyphenylene sulfide in a mass ratio of 1:2:7, and is melt-blended, granulated, cooled, crushed, and then modified by low-temperature plasma.

[0058] In this embodiment, hollow microspheres, reinforcing material, laterite nickel slag and heat-resistant elastic material in a weight percentage (wt.%) of 50:20:20:10 are pneumatically homogenized to obtain a high-temperature resistant micro-expansion toughening and lightening material 1# for cementing cement.

[0059] In this embodiment, a cement slurry was prepared according to the following formula: 80% G-grade oil well cement + 20% high-temperature resistant micro-expansion toughening and lightening material 1# for cementing cement (mass ratio), 1% high-temperature retarder and 4% high-temperature fluid loss additive, based on 100% of the G-grade oil well cement and the high-temperature resistant micro-expansion toughening and lightening material for cementing cement, and a water-cement ratio of 0.6, in accordance with the GB / T19139 standard to obtain cementing cement slurry system 1#.

[0060] Example 2

[0061] As a preferred embodiment of the present invention, this embodiment discloses a high-temperature resistant micro-expansion toughening and lightening material for cementing cement, the specific composition of which is shown in Table 2.

[0062] Table 2

[0063] Components Weight percentage (wt.%) hollow microspheres 60 Reinforcement materials 15 Laterite nickel slag 15 Heat-resistant elastic material 10

[0064] In this embodiment, the hollow microspheres are formed by mixing borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres in a mass ratio of 3:7.

[0065] In this embodiment, the reinforcing material is formed by mixing pseudo-boehmite, nano-boehmite and protein shale powder in a mass ratio of 2:3:5.

[0066] In this embodiment, the temperature-resistant elastic material is made of waste tile powder, polycarbonate and polyphenylene sulfide in a mass ratio of 1:2:7, and is melt-blended, granulated, cooled, crushed, and then modified by low-temperature plasma.

[0067] In this embodiment, hollow microspheres, reinforcing material, laterite nickel slag and heat-resistant elastic material in a weight percentage (wt.%) of 60:15:15:10 are pneumatically homogenized to obtain high-temperature resistant micro-expansion toughening and lightening material 2# for cementing cement.

[0068] In this embodiment, a cement slurry was prepared according to the following formula: 80% G-grade oil well cement + 20% high-temperature resistant micro-expansion toughening and lightening material 2# for cementing cement (mass ratio), 1% high-temperature retarder and 4% high-temperature fluid loss additive, based on 100% of G-grade oil well cement and high-temperature resistant micro-expansion toughening and lightening material for cementing cement, and a water-cement ratio of 0.6, in accordance with GB / T19139 standard, to obtain cementing cement slurry system 2#.

[0069] Example 3

[0070] As a preferred embodiment of the present invention, this embodiment discloses a high-temperature resistant micro-expansion toughening and lightening material for cementing cement, the specific composition of which is shown in Table 3.

[0071] Table 3

[0072] Components Weight percentage (wt.%) hollow microspheres 70 Reinforcement materials 10 Laterite nickel slag 10 Heat-resistant elastic material 10

[0073] In this embodiment, the hollow microspheres are formed by mixing borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres in a mass ratio of 3:7.

[0074] In this embodiment, the reinforcing material is formed by mixing pseudo-boehmite, nano-boehmite and protein shale powder in a mass ratio of 2:3:5.

[0075] In this embodiment, the temperature-resistant elastic material is made of waste tile powder, polycarbonate and polyphenylene sulfide in a mass ratio of 1:2:7, and is melt-blended, granulated, cooled, crushed, and then modified by low-temperature plasma.

[0076] In this embodiment, hollow microspheres, reinforcing material, laterite nickel slag and heat-resistant elastic material in a weight percentage (wt.%) of 70:10:10:10 are pneumatically homogenized to obtain high-temperature resistant micro-expansion toughening and lightening material 3# for cementing cement.

[0077] In this embodiment, a cement slurry was prepared according to the following formula: 80% G-grade oil well cement + 20% high-temperature resistant micro-expansion toughening and lightening material 3# for cementing cement (mass ratio), 1% high-temperature retarder and 4% high-temperature fluid loss additive, based on 100% of G-grade oil well cement and high-temperature resistant micro-expansion toughening and lightening material for cementing cement, and a water-cement ratio of 0.6. Cement slurry was obtained in accordance with GB / T19139 standard to obtain cementing cement slurry system 3#.

[0078] Example 4

[0079] As a preferred embodiment of the present invention, this embodiment discloses a high-temperature resistant micro-expansion toughening and lightening material for cementing cement, the specific composition of which is shown in Table 4.

[0080] Table 4

[0081] Components Weight percentage (wt.%) hollow microspheres 60 Reinforcement materials 15 Laterite nickel slag 15 Heat-resistant elastic material 10

[0082] In this embodiment, the hollow microspheres are formed by mixing borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres in a mass ratio of 3:7.

[0083] In this embodiment, the reinforcing material is formed by mixing pseudo-boehmite, nano-boehmite and protein shale powder in a mass ratio of 3:2:5.

[0084] In this embodiment, the temperature-resistant elastic material is made of waste tile powder, polycarbonate and polyphenylene sulfide in a mass ratio of 1:2:7, and is melt-blended, granulated, cooled, crushed, and then modified by low-temperature plasma.

[0085] In this embodiment, hollow microspheres, reinforcing material, laterite nickel slag and heat-resistant elastic material in a weight percentage (wt.%) of 60:15:15:10 are pneumatically homogenized to obtain high-temperature resistant micro-expansion toughening and lightening material 4# for cementing cement.

[0086] In this embodiment, a cement slurry was prepared according to the following formula: 80% G-grade oil well cement + 20% high-temperature resistant micro-expansion toughening and lightening material 4# for cementing cement (mass ratio), 1% high-temperature retarder and 4% high-temperature fluid loss additive, based on 100% of G-grade oil well cement and high-temperature resistant micro-expansion toughening and lightening material for cementing cement, and a water-cement ratio of 0.6. Cement slurry was obtained in accordance with GB / T19139 standard to obtain cementing cement slurry system 4#.

[0087] Example 5

[0088] As a preferred embodiment of the present invention, this embodiment discloses a high-temperature resistant micro-expansion toughening and lightening material for cementing cement, the specific composition of which is shown in Table 5.

[0089] Table 5

[0090] Components Weight percentage (wt.%) hollow microspheres 60 Reinforcement materials 15 Laterite nickel slag 15 Heat-resistant elastic material 10

[0091] In this embodiment, the hollow microspheres are formed by mixing borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres in a mass ratio of 3:7.

[0092] In this embodiment, the reinforcing material is formed by mixing pseudo-boehmite, nano-boehmite and protein shale powder in a mass ratio of 2.5:2.5:5.

[0093] In this embodiment, the temperature-resistant elastic material is made of waste tile powder, polycarbonate and polyphenylene sulfide in a mass ratio of 1:2:7, and is melt-blended, granulated, cooled, crushed, and then modified by low-temperature plasma.

[0094] In this embodiment, hollow microspheres, reinforcing material, laterite nickel slag and heat-resistant elastic material in a weight percentage (wt.%) of 60:15:15:10 are pneumatically homogenized to obtain high-temperature resistant micro-expansion toughening and lightening material 5# for cementing cement.

[0095] In this embodiment, a cement slurry was prepared according to the formula of 80% G-grade oil well cement + 20% high-temperature resistant micro-expansion toughening and lightening material 5# for cementing cement (mass ratio), 1% high-temperature retarder and 4% high-temperature fluid loss additive, based on 100% of G-grade oil well cement and high-temperature resistant micro-expansion toughening and lightening material for cementing cement, and a water-cement ratio of 0.6 in accordance with GB / T19139 standard to obtain cementing cement slurry system 5#.

[0096] Comparative Example 1

[0097] A comparative cementing slurry system was obtained by preparing a cement slurry according to the formula: 100% G-grade oil well cement + 1% high-temperature retarder + 4% high-temperature fluid loss additive, with a water-cement ratio of 0.6 and in accordance with GB / T19139 standard.

[0098] According to the GB / T19139 oil well cement test method, the cement slurry engineering properties of cementing slurry systems 1# to 5# and the comparison cementing slurry system were tested at 150°C. The results are shown in Table 6.

[0099] Table 6

[0100]

[0101] Figures 1 to 6 The thickening test curves are respectively the cement slurries prepared with the high temperature resistant micro-expansion toughening and lightening materials for cementing cement in Examples 1 to 5 and the cement slurry prepared in Comparative Example 1. The thickening time in Table 6 is obtained from the thickening time of each cement slurry.

[0102] According to the experimental data in Table 6, it can be concluded that the cement slurries prepared with the high-temperature resistant micro-expansion toughening and lightening materials for cementing cement in Examples 1 to 5 have excellent high-temperature engineering properties, API water loss of less than 40 ml, adjustable cement slurry thickening time, short transition time, right-angle thickening, and good compatibility with high-temperature retarders, fluid loss additives, etc.; and their anti-gas channeling SPN values ​​are less than 1.5, indicating that the cement slurries have excellent anti-gas channeling performance. The slurry densities of Examples 1 to 5 are much lower than those of Comparative Example 1, indicating that the high-temperature resistant micro-expansion lightening materials applied in the present invention have a good lightening effect.

[0103] Cement slurry samples from cementing systems 1# to 5# and the comparative cementing slurry system were poured into copper molds and then cured in a high-temperature curing kettle at 180°C for 2, 7, and 28-day curing cycles. Compressive strength was tested using a NYSQ-2017 pressure testing machine. The cured cement paste was cored and then subjected to triaxial mechanical testing. The testing standard for the cement paste was based on GB / T50266-2013, "Standard for Testing Methods of Engineering Rock Masses," and the equipment used was an RTR-1000 triaxial rock mechanics tester. The test results are shown in Table 7.

[0104] Table 7

[0105]

[0106] The data in Table 7 show that after a certain curing age, the cement slurry system prepared with the high-temperature resistant micro-expansion toughening and lightening material for cementing cement in Examples 1 to 5 has a 2d compressive strength greater than 20 MPa and high early strength; the compressive strength does not decline under high-temperature conditions, meeting the compressive strength requirements of cement stone under high-temperature conditions; while the comparative example shows a strength decline. This shows that the high-temperature resistant micro-expansion toughening and lightening material provided by the present invention can improve the high-temperature resistance of cement stone and promote the development of the early strength of cement stone. The cement slurry system prepared with the high-temperature resistant micro-expansion toughening and lightening material for cementing cement in Examples 1 to 5 has a cement stone elastic modulus less than 7 GPa, which is much smaller than that of Comparative Example 1. Therefore, the addition of the high-temperature resistant micro-expansion toughening and lightening material of the present invention effectively improves the toughness of the cementing cement, and the resulting cement stone has excellent toughness.

[0107] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention and are intended to illustrate the technical solutions of the present invention, rather than limiting them, and certainly not limiting the patent scope of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features therein may be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention. In other words, any changes or refinements made to the main design concept and spirit of the present invention that have no substantive significance, provided that the technical problems they solve are still consistent with those of the present invention, should be included in the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention to other related technical fields should also be included in the patent protection scope of the present invention.

Claims

1. A high temperature resistant micro-expansion toughening and lightening material for cementing cement, characterized in that: Its raw materials include the following components in weight percentage: Hollow microspheres: 50~70wt.%; Reinforcement material: 10 ~20wt.%; Laterite nickel slag: 10~20wt.%; Heat-resistant elastic material: 10wt.%; The hollow microspheres are a mixture of borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres; The reinforcing material is a mixture of pseudo-boehmite, nano-boehmite and protein shale powder; The temperature-resistant elastic material is prepared by mixing and modifying waste tile powder, polycarbonate and polyphenylene sulfide.

2. The high temperature resistant micro-expansion toughening and lightening material for cementing cement according to claim 1, characterized in that: Its raw materials include the following components in weight percentage: Hollow microspheres: 55~65wt.%; Reinforcement material: 15 ~20wt.%; Laterite nickel slag: 10~15wt.%; Heat-resistant elastic material: 10wt.%.

3. A high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 1 or 2, characterized in that: The hollow microspheres are prepared by mixing borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres in a mass ratio of (2-4):(6-8).

4. The high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 3, characterized in that: The hollow microspheres are formed by mixing borosilicate hollow glass microspheres and aluminum silicate hollow ceramic microspheres in a mass ratio of 3:

7.

5. The high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 1 or 2, characterized in that: The reinforcing material is prepared by mixing pseudo-boehmite, nano-boehmite and protein shale powder in a mass ratio of (2-3): (2-3):

5.

6. The high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 1 or 2, characterized in that: The heat-resistant elastic material is prepared by melt blending, granulating, cooling, and crushing waste tile powder, polycarbonate, and polyphenylene sulfide in a mass ratio of (0.5-1.5):(0.5-3):(5-9), and then subjected to low-temperature plasma modification.

7. The high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 6, characterized in that: The mass ratio of waste tile powder, polycarbonate and polyphenylene sulfide is 1:2:

7.

8. The high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 1 or 2, characterized in that: The borosilicate hollow glass microspheres have a particle size of 20-80 μm and a compressive strength of 30-90 MPa.

9. The high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 1 or 2, characterized in that: The aluminum silicate hollow ceramic microspheres have a particle size of 10-200 μm and a compressive strength of ≥350 MPa.

10. A high temperature resistant micro-expansion toughening and lightening material for cementing cement according to claim 1 or 2, characterized in that: The purity of the pseudo-boehmite is greater than 90 wt.%, and the average particle size is 5-10 μm.

11. The high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 1 or 2, characterized in that: The nano-boehmite is in powder form, has a purity greater than 98 wt.%, and a crystal particle size of 10-15 nm.

12. The high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 1 or 2, characterized in that: The particle size of the protein shale powder is ≥1200 mesh and the SiO2 content is ≥90 wt.%.

13. The high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 1 or 2, characterized in that: The laterite nickel slag has a particle size of ≥325 mesh, a SiO2 content of ≥50 wt.%, and a MgO content of ≥20 wt.%.

14. The high temperature resistant micro-expansion toughening and lightening material for cementing according to claim 1 or 2, characterized in that: The waste tile powder has a particle size of ≥800 mesh, a SiO2 content of ≥75 wt.%, and an Al2O3 content of ≥15 wt.%.

15. The method for preparing a high temperature resistant micro-expansion toughening and lightening material for cementing cement according to any one of claims 1 or 2, characterized in that: The method comprises the following steps: mixing hollow microspheres, reinforcing materials, laterite nickel slag and heat-resistant elastic materials in various proportions by pneumatic homogenization to obtain the high-temperature-resistant micro-expansion toughening and lightening material for cementing cement.

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