Cement expansion and reinforcing material for wide temperature range cementing and preparation method therefor

Abstract

Provided in the present invention are a cement expansion and reinforcing material for wide temperature range cementing and a preparation method therefor. Said cement expansion and reinforcing material comprises the following components in percentage by mass: 20-40% of sulfoaluminate cement, 20-40% of calcium sulfate, 30-60% of potassium feldspar, 1-10% of nano Al2O3, 1-10% of nano MgO, 1-10% of alumite and 1-10% of ferroaluminate cement. Said cement expansion and reinforcing material is suitable for cementing operations under medium-low temperature and ultra-high temperature deep well conditions, and can improve wellbore sealing integrity and cementing quality.

Description

A wide-temperature-zone cementing expansion reinforcement material and its preparation method

[0001] Cross-reference information

[0002] This application claims priority to Chinese Patent Application No. 202411620835.7, filed on November 13, 2024, entitled "A Wide-Temperature-Band Cement Expansion Reinforcement Material and Its Preparation Method and Application", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of oil and gas exploration and development, specifically to a wide-temperature-zone cement expansion reinforcement material and its preparation method. Background Technology

[0004] Cementing is a key engineering project supporting high-quality well construction, safe operation, and efficient production of oil and gas wells. With the deepening of exploration and development, high-temperature cement slurry technology faces enormous challenges under harsh geological and engineering conditions such as ultra-deep, ultra-high temperature, large-volume fracturing of tens of thousands of cubic meters, and strong injection and production.

[0005] At high temperatures, cement stone faces problems such as strength degradation, volume shrinkage, and poor temperature resistance, affecting the sealing performance of well cement. Oil and gas exploration and development technologies have placed higher demands on the mechanical properties and high-temperature resistance of cement stone.

[0006] To address the aforementioned issues, CN115716730A discloses a elasto-toughness micro-expansion cement slurry. This slurry is composed of 100 parts cement, 6 to 18 parts hydrogenated nitrile rubber, 10 to 35 parts coarse silica sand, 4 to 12 parts microsilica powder, 3 to 12 parts ultrafine cement, 3 to 6 parts expansion agent, 0 to 72 parts iron ore powder, 1 to 2 parts composite fiber toughening agent, 4 to 5 parts fluid loss reducing agent, 1 to 2 parts drag reducing agent, 0.5 to 4.0 parts retarder, 0.5 to 2.0 parts reinforcing agent, 0.5 parts defoamer, and 47 to 57 parts water. It exhibits a 7-day compressive strength >28 MPa, a 7-day Young's modulus <5 GPa, and a 24-hour linear expansion rate of cement >0.3%. However, the applicability of this cement slurry is limited, and it is only suitable for wells with a bottom-hole temperature of 80℃-160℃.

[0007] CN117304893A discloses a cement slurry system for cementing under ultra-high temperature conditions. This cement slurry system is composed of 100 parts cement, 15-50 parts ultra-high temperature strength stabilizer, 15-50 parts ultra-high temperature reinforcing material, 0-140 parts density regulator, 1-6 parts ultra-high temperature suspension stabilizer, 0-2 parts dispersant, 2-9 parts fluid loss reducer, 0.1-9 parts retarder, 0.1-0.5 parts defoamer, and 40-120 parts water. The applicable temperature is 30℃-240℃, and the 28-day compressive strength of the cement stone is greater than 35MPa. It is suitable for cementing deep and ultra-deep wells. However, this cement slurry system is insufficient in improving the expansion performance of the cement stone.

[0008] Therefore, based on these issues, developing a wide-temperature-range cement expansion reinforcement material that does not degrade in high temperature, does not shrink in volume, and has a wide temperature resistance range is of great practical significance. Summary of the Invention

[0009] To address the aforementioned technical problems, the present invention aims to provide a wide-temperature-zone cement expansion reinforcement material and its preparation method. This wide-temperature-zone cement expansion reinforcement material is suitable for cementing operations under medium-low temperature and ultra-high temperature deep well conditions, and can improve wellbore sealing integrity and cementing quality.

[0010] To achieve the above objectives, the present invention first provides a wide-temperature-zone cementing expansion reinforcement material, comprising the following components by mass percentage:

[0011] According to a specific embodiment of the present invention, preferably, the wide-temperature-zone cementing expansion reinforcement material has the following composition by mass percentage:

[0012] In the mass percentage composition of the wide-temperature-zone cementing expansion reinforcement material of the present invention, the sum of the mass percentages of each component is 100%.

[0013] In the above-mentioned wide-temperature-zone cementing expansion reinforcement material, preferably, the sulfoaluminate cement has the following composition by mass percentage: 92%-95% sulfoaluminate cement clinker and 2%-8% gypsum.

[0014] More preferably, the sulfoaluminate cement clinker mineral is calcium sulfoaluminate cement clinker mineral, which has the following composition by mass percentage: 55%-75% calcium sulfoaluminate, 8%-37% dicalcium silicate, 15%-35% tetracalcium aluminoferrite, 0%-3% calcium sulfate, 1%-5% free calcium oxide and / or free magnesium oxide, and 0%-0.6% sodium oxide and / or potassium oxide; wherein, the ratio between free calcium oxide and free potassium oxide can be arbitrary, and the ratio between sodium oxide and potassium oxide can be arbitrary.

[0015] More preferably, the gypsum is one or a combination of two or more of natural dihydrate gypsum, anhydrite, and mixed gypsum.

[0016] In the above-mentioned wide-temperature-zone cementing expansion reinforcement material, preferably, the calcium sulfate is calcium sulfate dihydrate.

[0017] In the above-mentioned wide-temperature-zone cementing expansion reinforcement material, preferably, the potassium feldspar comprises 300-mesh potassium feldspar and 800-mesh potassium feldspar, wherein the 300-mesh potassium feldspar accounts for 30-70 parts by mass and the 800-mesh potassium feldspar accounts for 30-70 parts by mass.

[0018] In the above-mentioned wide-temperature-zone cement expansion reinforcement material, preferably, the nano-Al2O3 is Al2O3 with a particle size of 1-100nm.

[0019] In the aforementioned wide-temperature-range cementitious expansion reinforcement material, preferably, the nano-MgO is MgO with a particle size of 1-100 nm. Conventional MgO powder reacts slowly with cement hydration, and the expansion effect is manifested in the later stage of cement hydration. Nano-MgO has a large specific surface area and finer particles, allowing for a more complete reaction with cement and accelerating the expansion of cement stone. By controlling the amount of nano-MgO added, the expansion rate of cement stone can be controlled.

[0020] In the above-mentioned wide-temperature-zone cement expansion reinforcement material, preferably, the aluminoferrite cement is calcium aluminoferrite cement, which has the following composition by mass percentage: 30%-45% anhydrous calcium sulfoaluminate, 30%-40% dicalcium silicate and 30%-35% calcium aluminoferrite.

[0021] The present invention also provides a method for preparing the above-mentioned wide-temperature-zone cementing expansion reinforcement material, which includes the following steps: mixing sulfoaluminate cement, calcium sulfate, potassium feldspar, nano-Al2O3, nano-MgO, alunite, and ferroaluminate cement evenly to obtain the wide-temperature-zone cementing expansion reinforcement material.

[0022] This invention also provides the application of the above-mentioned wide-temperature-zone cement expansion reinforcement material in cement preparation.

[0023] The present invention also provides a cementing cement containing the above-mentioned wide-temperature-zone cementing expansion-reinforcing material.

[0024] The technical solution of the present invention has the following beneficial technical effects:

[0025] (1) To address the problem of strength degradation of cement stone at high temperatures, the wide-temperature-zone cementing expansion reinforcing material of this invention, through the combined action of sulfoaluminate cement, calcium sulfate dihydrate, potassium feldspar, and nano-Al2O3, can improve the temperature resistance of cement stone and promote the early hydration process of cement. The nano-scale material has a large specific surface area, which can accelerate the reaction process with cement and improve the strength of cement stone under high temperature conditions. The 28-day curing strength of cement stone is greater than 40 MPa, and there is no degradation compared with the 2-day curing strength. This is conducive to the long-term stability of strength and prevention of degradation, ensuring that the expansion rate of cement stone is >0.01%, and improving the early strength of the top cement stone.

[0026] (2) In view of the problem of volume shrinkage of high temperature cement stone, the sulfoaluminate cement and nano MgO used in this invention can improve the expansion performance of cement.

[0027] (3) The applicable cycling temperature range of the wide-temperature-zone cementing expansion reinforcing material of the present invention is 30℃-240℃, and within the applicable cycling temperature range of the wide-temperature-zone cementing expansion reinforcing material of the present invention, there is no adverse effect on the thickening time, and the thickening time will not be shortened. Moreover, the wide-temperature-zone cementing expansion reinforcing material of the present invention can reduce the amount of retarder added, and the thickening time of the cement slurry is adjustable, and it is inexpensive and readily available.

[0028] The wide-temperature-zone cement expansion reinforcement material of the present invention is suitable for cementing operations under medium-low temperature and ultra-high temperature deep well conditions, and can improve wellbore sealing integrity and cementing quality. Detailed Implementation

[0029] In order to provide a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solution of the present invention will now be described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

[0030] The experiments were conducted in accordance with GB / T 19139-2012 "Test Methods for Cement in Oil Wells". The main experimental instruments included: a 30-60 type corrugated agitator, an 8240 type high-temperature and high-pressure thickener (CHANDLER, USA); an ultra-high temperature curing autoclave (Shenyang Taige Petroleum Instrument Equipment Manufacturing Co., Ltd.); and a uniform load pressure testing machine (Shenyang Jinouke Petroleum Instrument Technology Development Co., Ltd.).

[0031] The calcium sulfoaluminate cement, calcium ferroaluminate cement, calcium sulfate dihydrate, potassium feldspar, nano-Al2O3, and nano-MgO used in the examples and comparative examples were all commercially available.

[0032] The calcium sulfoaluminate cement has the following composition by mass percentage: 95% calcium sulfoaluminate cement clinker minerals and 5% gypsum; wherein the calcium sulfoaluminate cement clinker minerals have the following composition by mass percentage: 65% calcium sulfoaluminate, 18% dicalcium silicate, 15% tetracalcium aluminoferrite, 0.8% calcium sulfate, 1% free calcium oxide, and 0.2% sodium oxide.

[0033] The potassium feldspar comprises 300 mesh potassium feldspar and 800 mesh potassium feldspar, wherein the 300 mesh potassium feldspar accounts for 40 parts by mass and the 800 mesh potassium feldspar accounts for 60 parts by mass.

[0034] The calcium aluminoferrite cement has the following composition by mass percentage: 40% anhydrous calcium sulfoaluminate, 30% dicalcium silicate and 30% calcium aluminoferrite.

[0035] Unless otherwise specified, all parts in the following examples and comparative examples are parts by weight.

[0036] Example 1:

[0037] This embodiment provides a wide-temperature-zone cement expansion reinforcement material, which is prepared by the following method:

[0038] Weigh out 30 parts of calcium sulfoaluminate cement, 30 parts of calcium sulfate dihydrate, 30 parts of potassium feldspar, 3 parts of Al2O3 with a particle size of 80 nanometers, 3 parts of MgO with a particle size of 50 nanometers, 2 parts of natural alunite, and 2 parts of calcium aluminoferrite cement. Mix the seven components thoroughly to obtain a wide-temperature-zone cementing expansion reinforcement material.

[0039] Example 2:

[0040] This embodiment provides a wide-temperature-zone cement expansion reinforcement material, which is prepared by the following method:

[0041] Weigh out 40 parts of calcium sulfoaluminate cement, 25 parts of calcium sulfate dihydrate, 25 parts of potassium feldspar, 3 parts of Al2O3 with a particle size of 80 nanometers, 3 parts of MgO with a particle size of 50 nanometers, 2 parts of natural alunite, and 2 parts of calcium aluminoferrite cement. Mix the seven ingredients thoroughly to obtain a wide-temperature-zone cementing expansion reinforcement material.

[0042] Example 3:

[0043] This embodiment provides a wide-temperature-zone cement expansion reinforcement material, which is prepared by the following method:

[0044] Weigh out 25 parts of calcium sulfoaluminate cement, 25 parts of calcium sulfate dihydrate, 40 parts of potassium feldspar, 3 parts of Al2O3 with a particle size of 80 nanometers, 3 parts of MgO with a particle size of 50 nanometers, 2 parts of natural alum stone, and 2 parts of calcium aluminoferrite cement. Mix the seven ingredients thoroughly to obtain a wide-temperature-zone cementing expansion reinforcement material.

[0045] Example 4:

[0046] This embodiment provides a wide-temperature-zone cement expansion reinforcement material, which is prepared by the following method:

[0047] Weigh out 20 parts of calcium sulfoaluminate cement, 20 parts of calcium sulfate dihydrate, 40 parts of potassium feldspar, 7 parts of Al2O3 with a particle size of 80 nanometers, 9 parts of MgO with a particle size of 50 nanometers, 2 parts of natural alum stone, and 2 parts of calcium aluminoferrite cement. Mix the seven ingredients thoroughly to obtain a wide-temperature-zone cementing expansion reinforcement material.

[0048] Example 5:

[0049] This embodiment provides a wide-temperature-zone cement expansion reinforcement material, which is prepared by the following method:

[0050] Weigh out 30 parts of calcium sulfoaluminate cement, 30 parts of calcium sulfate dihydrate, 30 parts of potassium feldspar, 3 parts of Al2O3 with a particle size of 80 nanometers, 3 parts of MgO with a particle size of 50 nanometers, 2 parts of natural alum stone, and 2 parts of calcium aluminoferrite cement. Mix the seven ingredients thoroughly to obtain a wide-temperature-zone cementing expansion reinforcement material.

[0051] Example 6:

[0052] This embodiment provides a wide-temperature-zone cement expansion reinforcement material, which is prepared by the following method:

[0053] Weigh out 20 parts of calcium sulfoaluminate cement, 35 parts of calcium sulfate dihydrate, 35 parts of potassium feldspar, 3 parts of Al2O3 with a particle size of 80 nanometers, 3 parts of MgO with a particle size of 50 nanometers, 2 parts of natural alum stone, and 2 parts of calcium aluminoferrite cement. Mix the seven ingredients thoroughly to obtain a wide-temperature-zone cementing expansion reinforcement material.

[0054] Comparative Example 1:

[0055] This comparative example provides a cementitious expansion reinforcement material, which is prepared by the following method:

[0056] Weigh out 20 parts of calcium sulfoaluminate cement, 20 parts of calcium sulfate dihydrate, 30 parts of potassium feldspar, 13 parts of Al2O3 with a particle size of 80 nanometers, 13 parts of MgO with a particle size of 50 nanometers, 2 parts of natural alum stone, and 2 parts of calcium aluminoferrite cement. Mix the seven ingredients thoroughly to obtain a cementitious expansion and reinforcement material.

[0057] Comparative Example 2:

[0058] This comparative example provides a cementitious expansion reinforcement material, which is prepared by the following method:

[0059] Weigh out 35 parts of calcium sulfoaluminate cement, 35 parts of calcium sulfate dihydrate, 20 parts of potassium feldspar, 3 parts of Al2O3 with a particle size of 80 nanometers, 3 parts of MgO with a particle size of 50 nanometers, 2 parts of natural alum stone, and 2 parts of calcium aluminoferrite cement. Mix the seven ingredients thoroughly to obtain a cementitious expansion and reinforcement material.

[0060] Comparative Example 3:

[0061] This comparative example provides a cementitious expansion reinforcement material, which is prepared by the following method:

[0062] Weigh out 15 parts of calcium sulfoaluminate cement, 15 parts of calcium sulfate dihydrate, 60 parts of potassium feldspar, 3 parts of Al2O3 with a particle size of 80 nanometers, 3 parts of MgO with a particle size of 50 nanometers, 2 parts of natural alum stone, and 2 parts of calcium aluminoferrite water. Mix the seven ingredients thoroughly to obtain a cementitious expansion and reinforcing material.

[0063] Testing the enhancing effect of wide-temperature-zone cementing expansion reinforcement materials on cement performance:

[0064] The cement paste formulation tested at 30℃, 60℃, and 90℃ was: 600g G-grade cement + 12g microsilica + 3g dispersant + 18g cement expansion reinforcing material + 264g water. The cement expansion reinforcing materials in this formulation were the cement expansion reinforcing materials provided in Example 1, Example 4, and Comparative Example 1, respectively.

[0065] The cement stone formulations tested at 120℃ and 150℃ (Examples 2, 5, and Comparative Example 2) were: 600g Grade G cement + 210g 600-mesh quartz sand + 18g fluid loss reducer + 6g dispersant + 3g high-temperature stabilizer + 6.6g retarder + 18g cement expansion reinforcing material + 330g water. The cement expansion reinforcing materials in these formulations were the cement expansion reinforcing materials provided in Examples 2, 5, and Comparative Example 2, respectively.

[0066] The cement stone formulations tested at 200℃ and 240℃ (Examples 3, 6, and Comparative Example 3) were: 600g Grade G cement + 300g 600-mesh quartz sand + 24g high-temperature stabilizer + 9g dispersant + 30g fluid loss reducer + 15g retarder + 36g cement expansion reinforcing material + 360g water. The cement expansion reinforcing materials in these formulations were the cement expansion reinforcing materials provided in Examples 3, 6, and 3, respectively.

[0067] The retarder is DRH-3L (China National Petroleum Corporation Engineering Technology Research Institute Co., Ltd.);

[0068] The fluid loss reducing agent is DRF-3L (China National Petroleum Corporation Engineering Technology Research Institute Co., Ltd.);

[0069] The dispersant is DRS-2S (China National Petroleum Corporation Engineering Technology Research Institute Co., Ltd.);

[0070] The high-temperature stabilizer is DRK-3S (China National Petroleum Corporation Engineering Technology Research Institute Co., Ltd.).

[0071] Test Example 1:

[0072] The mechanical properties of cement stone made with the wide-temperature-zone cementing expansion reinforcing materials of Examples 1 and 4 and cement stone made with the cementing expansion reinforcing material of Comparative Example 1 were compared. Specifically, the compressive strength of the hardened cement stone was measured after curing at 30℃*normal pressure, 60℃*normal pressure and 90℃*normal pressure for 2 days and 7 days, respectively.

[0073] The mechanical properties of cement stone made with the wide-temperature-zone cementing expansion reinforcement material of Examples 2 and 5 and cement stone made with the cementing expansion reinforcement material of Comparative Example 2 were compared. Specifically, the compressive strength of the hardened cement stone was measured after curing at 120℃*20.7MPa and 150℃*20.7MPa for 2 days and 7 days, respectively.

[0074] The mechanical properties of cement stone made with the wide-temperature-zone cementing expansion reinforcement materials of Examples 3 and 6 and cement stone made with the cementing expansion reinforcement material of Comparative Example 3 were compared. Specifically, the compressive strength of the hardened cement stone was measured after curing at 200℃*20.7MPa and 240℃*20.7MPa for 2 days and 7 days, respectively.

[0075] The evaluation results of the compressive strength of cement stone are shown in Table 1.

[0076] Table 1

[0077] The test results in Table 1 show that:

[0078] Compared with Example 1, Example 4 shows that the optimal ratio of calcium sulfoaluminate cement: calcium sulfate dihydrate: potassium feldspar = 1:1:2 is the best for cement stone performance under the conditions of 30℃, 60℃, and 90℃. By adjusting the ratio of calcium, silicon, and aluminum, the crystal phase structure of the cement stone hydration products can be designed. When mixed with nano-Al2O3, nano-MgO, natural alum stone, and aluminoferrite cement, the early compressive strength of the cement stone can be significantly improved. The mechanical properties of cement stone made using the wide-temperature-zone cementing expansion reinforcement material of Example 4 are better than those of cement stone made using the wide-temperature-zone cementing expansion reinforcement material of Example 1.

[0079] Compared with Example 2, under the conditions of 120℃ and 150℃, the ratio of calcium sulfoaluminate cement: calcium sulfate dihydrate: potassium feldspar = 1:1:1 is the optimal ratio for cement stone performance. By adjusting the calcium-silicon-aluminum ratio, the strength degradation of cement stone is effectively prevented. The 7-day compressive strength of cement stone made from the wide-temperature-zone cementing expansion reinforcing material of Example 5 is higher than that of 2-day compressive strength. The mechanical properties of cement stone made from the wide-temperature-zone cementing expansion reinforcing material of Example 5 are better than those of cement stone made from the wide-temperature-zone cementing expansion reinforcing material of Example 2.

[0080] Compared with Example 3, under the conditions of 200℃ and 240℃, the ratio of calcium sulfoaluminate cement: calcium sulfate dihydrate: potassium feldspar = 4:7:7 is the optimal ratio for cement stone performance. By adjusting the calcium-silicon-aluminum ratio, the cement stone has good high-temperature resistance, and its strength does not decline at high temperatures. Moreover, it can prolong the thickening time of the cement slurry system at high temperatures and reduce the amount of retarder. The mechanical properties of the cement stone made using the wide-temperature-zone cementing expansion reinforcement material of Example 6 are better than those of the cement stone made using the wide-temperature-zone cementing expansion reinforcement material of Example 3.

[0081] In Comparative Example 1, the content of nano-Al2O3 was 13 parts and the content of nano-MgO was 13 parts, which exceeded the corresponding content range of 1-10 parts in the wide-temperature-zone cement expansion reinforcement material of the present invention. The compressive strength of the cement stone was low and there was slight cement stone cracking.

[0082] In Comparative Example 2, the content of potassium feldspar was 20 parts, which is outside the corresponding content range of 30-60 parts in the wide-temperature-zone cementing expansion reinforcement material of the present invention. Under the conditions of 120°C and 150°C, the strength of the cement stone declined and the strength was low. This shows that the content range of the wide-temperature-zone cementing expansion reinforcement material of the present invention is the optimal range.

[0083] In Comparative Example 3, the content of calcium sulfoaluminate cement was 15 parts, and the content of calcium sulfate dihydrate was 15 parts, which was not within the corresponding content range of 20-40 parts in the wide-temperature-zone cement expansion reinforcement material of the present invention. Under the conditions of 200℃ and 240℃, the cement stone showed serious degradation after 7 days compared with that after 2 days.

[0084] Test Example 2:

[0085] The comprehensive performance of cement slurry made from cement stone prepared using cement expansion reinforcing materials of Examples 1-6 and Comparative Examples 1-3 was tested, and the results of the comprehensive performance test of cement slurry are shown in Table 2.

[0086] Table 2

[0087] The experimental results in Table 2 show that the cement slurry system prepared with the wide-temperature-zone cementing expansion reinforcement material of the embodiment has good comprehensive performance and meets the requirements of cementing operations under medium-low temperature and ultra-high temperature deep well conditions.

[0088] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications, equivalent substitutions, and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A wide-temperature-zone cementing expansion reinforcement material, comprising the following components by weight percentage:

2. The wide-temperature-zone cementing expansion reinforcement material according to claim 1, wherein, The wide-temperature-zone cementing expansion reinforcement material has the following composition by mass percentage:

3. The wide-temperature-zone cementing expansion reinforcement material according to claim 1, wherein, The sulfoaluminate cement has the following composition by weight percentage: 92%-95% sulfoaluminate cement clinker and 2%-8% gypsum.

4. The wide-temperature-zone cementing expansion reinforcement material according to claim 3, wherein, The sulfoaluminate cement clinker mineral is calcium sulfoaluminate cement clinker mineral, which has the following composition by mass percentage: 55%-75% calcium sulfoaluminate, 8%-37% dicalcium silicate, 15%-35% tetracalcium aluminoferrite, 0%-3% calcium sulfate, 1%-5% free calcium oxide and / or free magnesium oxide, and 0%-0.6% sodium oxide and / or potassium oxide.

5. The wide-temperature-zone cementing expansion reinforcement material according to claim 3, wherein, The gypsum is one or a combination of two or more of the following: natural dihydrate gypsum, anhydrite, and mixed gypsum.

6. The wide-temperature-zone cementing expansion reinforcement material according to claim 1, wherein, The potassium feldspar comprises 300-mesh potassium feldspar and 800-mesh potassium feldspar, wherein the 300-mesh potassium feldspar accounts for 30-70 parts by mass and the 800-mesh potassium feldspar accounts for 30-70 parts by mass.

7. The wide-temperature-zone cementing expansion reinforcement material according to claim 1, wherein, The nano-Al2O3 is Al2O3 with a particle size of 1-100nm.

8. The wide-temperature-zone cementing expansion reinforcement material according to claim 1, wherein, The nano-MgO is MgO with a particle size of 1-100 nm.

9. The wide-temperature-zone cementing expansion reinforcement material according to claim 1, wherein, The aluminoferrite cement is calcium aluminoferrite cement, which has the following components by mass percentage: 30%-45% anhydrous calcium sulfoaluminate, 30%-40% dicalcium silicate and 30%-35% calcium aluminoferrite.

10. A method for preparing a wide-temperature-zone cementing expansion-reinforced material according to any one of claims 1-9, comprising the following steps: The wide-temperature zone cementing expansion reinforcement material is obtained by uniformly mixing sulfoaluminate cement, calcium sulfate, potassium feldspar, nano-Al2O3, nano-MgO, alunite, and ferroaluminate cement.

11. The application of the wide-temperature-zone cementing expansion reinforcing material according to any one of claims 1-9 in the preparation of cementing cement.

12. A cementing cement comprising the wide-temperature-zone cementing expansion reinforcing material as described in any one of claims 1-9.

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