Temperature response type self-healing thickened oil thermal recovery well cementation material

Abstract

The invention discloses a temperature response type self-healing thickened oil thermal recovery well cementation material, and relates to the technical field of well cementation materials. The self-healing thickened oil thermal recovery well cementation material is prepared from, by weight, 40-53 parts of oil well cement, 24-25 parts of sulfur silicate cement, 14-20 parts of siliceous materials, 1-3 parts of modified water-absorbent resin and 0.1-0.3 part of short carbon fibers, the modified water-absorbent resin is of a core-shell structure, the particle size of the modified water-absorbent resin is smaller than 200 meshes, the shell is magnesium stearate or aluminum stearate, and the core-shell structure is magnesium stearate or aluminum stearate. And the inner core is polyacrylic acid water-absorbent resin. By introducing a self-healing mechanism of temperature and water composite response and utilizing a structure transformation mechanism of the modified water-absorbent resin and ettringite minerals under different temperature and water-containing conditions, the purpose of self-repairing micro-annular gaps and micro-cracks generated by the heavy oil thermal recovery well cementation cement under a variable temperature condition is achieved; and the integrity of the thickened oil thermal recovery well cementation cement sheath is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of cementing materials technology, and more specifically to a temperature-responsive self-healing cementing material for heavy oil thermal recovery. Background Technology

[0002] Heavy oil is an important petrochemical energy source, accounting for over 27% of my country's onshore oil and gas resources and over 65% of its offshore oil and gas resources. Onshore heavy oil is mainly distributed in oilfields such as Liaohe, Henan, and Karamay in Xinjiang, while offshore heavy oil is mainly distributed in the Bohai Sea, East China Sea, and South China Sea. Due to its high viscosity and density, heavy oil experiences significant flow resistance in formations, resulting in low extraction efficiency using conventional methods. To improve recovery rates, heavy oil extraction requires a series of specialized technologies, among which thermal recovery technologies such as steam injection, steam drive, and hot water drive are key methods. These technologies inject high-temperature steam into the formation to heat the heavy oil, reducing its viscosity and improving its fluidity.

[0003] When using steam thermal recovery, the steam temperature typically reaches 300℃-350℃, placing stringent requirements on the high-temperature resistance of the cement sheath. Currently, the commonly used high-temperature resistant cement is Grade G oil well cement mixed with quartz sand, and this cement slurry system possesses certain high-temperature resistance. However, during engineering applications, it has been found that after two or three high- and low-temperature cycles of steam thermal recovery, problems such as cement stone strength degradation and wellhead uplift occur. In the field, this manifests as inter-layer fluid cross-contamination, severe wellhead pressurization, significant gas and bubbling around the well site, and severe casing damage, greatly shortening the production life of heavy oil wells and affecting the production efficiency of heavy oil thermal recovery wells.

[0004] Currently, the failure mechanisms of cement sheaths in heavy oil thermal recovery wells mainly fall into two categories: First, commonly used G-grade sand-added cement exhibits significant strength degradation under high-temperature conditions; second, during steam thermal recovery, when the wellbore is heated from the formation temperature to a high temperature by steam, the difference in thermal expansion coefficients between the casing and the cement sheath leads to significant plastic deformation and cracking of the cement sheath under complex thermal stress conditions, ultimately resulting in the loss of its protective function for the casing.

[0005] To address the problems existing in cementing for heavy oil thermal recovery wells, industry experts have conducted extensive research on cementing materials, high-temperature resistant admixtures, and toughening materials. For example, patent application CN102994058A discloses a high-temperature resistant non-silicate cement slurry system for heavy oil thermal recovery wells, composed of: 100 parts high-temperature resistant cement; 1.0-4.0 parts fluid loss reducer; 1.0-4.0 parts dispersant; 0.5-3.0 parts setting regulator; 60-120 parts water; and 15-80 parts heat regulator. The high-temperature resistant cement is composed of component A and component B mixed in a 1:1 weight ratio. The chemical composition of component A is as follows by weight: 50-77 parts Al₂O₃, 0.5-8.0 parts SiO₂, 0.5-2.5 parts Fe₂O₃, and 0-0.4 parts RO(Na₂O + 0.658K₂O). The clinker minerals of component B are composed of the following weight ratios: 3CaO·Al2O3·CaSO4 33~63 parts, 2CaO·SiO2 14~37 parts, 6CaO·Al2O3·2Fe2O3 15~35 parts; the heat regulator is slag or fly ash with a particle size range of 300 mesh~1500 mesh.

[0006] For example, patent applications CN105271853A (titled "A Cement for Fire-Driven Heavy Oil Thermal Recovery Wells"), CN106007545A (titled "A Long-Term Integrity Cement Slurry for Heavy Oil Thermal Recovery Wells and its Preparation Method"), CN110734259A (titled "A Thermoelastic Cement for Heavy Oil Thermal Recovery"), and CN107892906A (titled "Anti-Fading Cement Slurry for Heavy Oil Thermal Recovery Wells") all disclose cementing materials that have achieved certain results in improving the high-temperature resistance of cementing materials for heavy oil thermal recovery, mainly addressing the strength stability problem of cement stone under high-temperature curing conditions. However, these existing technologies fail to provide effective solutions for the shrinkage deformation of the cement sheath caused by thermal stress and the resulting micro-annular cracks. Summary of the Invention

[0007] To overcome the defects and shortcomings of the existing technology, this invention provides a temperature-responsive self-healing cementing material for heavy oil thermal recovery. The purpose of this invention is to solve the problem of micro-annular cracks caused by the shrinkage deformation of the cement sheath due to thermal stress in heavy oil thermal recovery wells. This invention introduces a self-healing mechanism that combines temperature and water responses, utilizing the structural transformation mechanism of modified water-absorbing resin and ettringite minerals under different temperature and water-content conditions to achieve self-repair of micro-annular gaps and micro-cracks generated in the cement sheath of heavy oil thermal recovery wells under variable temperature conditions, effectively improving the integrity of the cement sheath in heavy oil thermal recovery wells.

[0008] To address the problems existing in the prior art, the present invention is achieved through the following technical solution.

[0009] This invention provides a temperature-responsive self-healing cementing material for heavy oil thermal recovery, which comprises the following components by weight: 40-53 parts of cement for oil wells; 24-25 parts of sulfosilicate cement; 14-20 parts of siliceous material; 1-3 parts of modified water-absorbing resin; 0.1-0.3 parts of chopped carbon fiber; The modified water-absorbing resin has a core-shell structure with a particle size of less than 200 mesh. The outer shell is magnesium stearate or aluminum stearate, and the core is polyacrylic acid water-absorbing resin.

[0010] More preferably, the modified water-absorbing resin is prepared by the following preparation method, specifically, Weigh out polyacrylic acid superabsorbent resin, magnesium stearate or aluminum stearate, and silane coupling agent in a weight ratio of 80:20:2; mix them thoroughly in a mixer; transfer the thoroughly mixed material to a heating container and heat it to 90℃-130℃; after the magnesium stearate or aluminum stearate has completely dissolved and dispersed evenly, transfer it to a high-speed centrifugal spray granulator, and obtain a modified superabsorbent resin with a core-shell structure through high-speed dispersion granulation, cooling, and collection.

[0011] More preferably, the water absorption ratio of the polyacrylic acid superabsorbent resin is 200-300 g / g; the powder particle size is less than 300 mesh.

[0012] More preferably, the silane coupling agent is KH560 or KH570.

[0013] More preferably, the polyacrylic water-absorbing resin is an acrylic-acrylamide copolymer water-absorbing resin or sodium polyacrylate water-absorbing resin.

[0014] More preferably, the weight composition of the sulfosilicate cement, by weight percentage, is: calcium sulfoaluminate 15%-21%, calcium sulfosilicate 30%-45%, dicalcium silicate 30%-45%, gypsum 4%-8%; and the specific surface area of ​​the sulfosilicate cement is 300-350 m². 2 / kg.

[0015] More preferably, the oil well cement is Grade A, Grade D, or Grade G oil well cement.

[0016] More preferably, the silicon dioxide content in the siliceous material is greater than 70%, and the structure is amorphous.

[0017] More preferably, the chopped carbon fiber has a length of 3-6 mm and a diameter of 6-8 μm.

[0018] Compared with the prior art, the beneficial technical effects of the technical solution of the present invention are as follows: 1. The self-healing cementing material for heavy oil thermal recovery of this invention possesses excellent self-healing properties. This invention designs two temperature-responsive self-healing mechanisms to effectively ensure the integrity of the wellbore during high-temperature circulation of the cement sheath in heavy oil thermal recovery cementing. One mechanism involves the addition of modified water-absorbing resin. This material has a core-shell structure. During cementing operations, because the outer shell is insoluble in magnesium stearate or aluminum stearate, and the formation temperature is lower than the melting point of magnesium stearate or aluminum stearate, the water-absorbing resin is prevented from contacting water in the cement slurry, thus filling the cement stone with a complete core-shell structure. When high-temperature steam is injected into the wellbore, the temperature is much higher than the melting point of stearate. Under the influence of temperature and stress, the core-shell structure of the modified water-absorbing resin is destroyed. After the high-temperature steam injection stops, micro-annular gaps appear between the cement sheath and the casing due to casing contraction. Upper formation water will seep into these micro-annular gaps and fractures. When this water-absorbing resin encounters the water, it absorbs water, expands, and fills the gaps, achieving the purpose of filling the gaps and isolating the water layer. Secondly, sulfur silicate cement is added to the cementing material. Under cementing temperature conditions, this cement hydrates to produce high-sulfur calcium vanadium. When high-temperature steam is injected into the wellbore, the high-sulfur calcium vanadium dehydrates and transforms into low-sulfur calcium vanadium, accompanied by volume shrinkage. After the high-temperature steam injection stops, the upper formation water comes into contact with the cement sheath. When the temperature drops to a certain value, the low-sulfur calcium vanadium reacts with water to reform high-sulfur calcium vanadium, accompanied by volume expansion. By utilizing this volume expansion effect, the micro-annular gap between the casing and the cement sheath is effectively reduced, thereby improving the wellbore integrity of the cement sheath in heavy oil thermal recovery after high-temperature steam injection and increasing the recovery rate of heavy oil.

[0019] 2. The self-healing cementing material for heavy oil thermal recovery exhibits excellent cementing sealing performance. During the hydration of sulfosilicate cement, the hydration reaction forms high-sulfur calcium vanadium, which exhibits a volume expansion effect, effectively preventing micro-annular gaps in the cement sheath. Furthermore, the setting time of sulfosilicate cement is shorter than that of oil well cement, which helps to shorten the thickening test time of heavy oil thermal recovery cement and reduces the probability of water channeling during cement slurry weight loss, thereby effectively improving cementing quality.

[0020] 3. The self-healing cementing material for heavy oil thermal recovery of this invention produces cement stone with excellent high-temperature mechanical properties. This invention, by incorporating amorphous silicate materials, effectively reduces the calcium-silica ratio of hydration products through a pozzolanic reaction with oil well cement, accelerating the hydration reaction of silicate cement and sulfosilicate cement, and improving the uniformity of the cement stone structure. During high-temperature steam injection, the low-calcium-silica hydrated calcium silicate transforms into hard calcium silicate, which, due to its uniform structural distribution, effectively improves the strength stability of the cement stone under high-temperature conditions. Furthermore, the short-cut carbon fibers possess excellent high-temperature resistance and stability, effectively improving the toughness of the cement stone under high-temperature conditions and preventing cement annulus cracking caused by high-temperature casing expansion. Attached Figure Description

[0021] Figure 1 This is a thickening experiment curve of the self-healing heavy oil thermal recovery cementing material in Example 1 of the present invention; Figure 2 This is a thickening experiment curve of the 1G grade sand-added cement, which is a comparative example of the present invention. Figure 3 This is a SEM image of the modified water-absorbing resin added to the self-healing heavy oil thermal recovery cementing material in Example 1 of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] Example 1 As a preferred embodiment of the present invention, this embodiment provides a temperature-responsive self-healing cementing material for heavy oil thermal recovery, the specific components of which are as follows (in parts by weight): 40 parts of Grade A oil well cement; 45 parts of sulfosilicate cement; 14 parts of siliceous material; 1 part of modified water-absorbing resin; 0.1 part of chopped carbon fiber; The weight composition of sulfosilicate cement is as follows: calcium sulfoaluminate 17%, calcium sulfosilicate 45%, dicalcium silicate 30%, gypsum 8%, and the specific surface area of ​​sulfosilicate cement is 300 m². 2 / kg; The modified superabsorbent polymer has a core-shell structure with a particle size of less than 200 mesh. The outer shell is aluminum stearate, and the core is acrylic-acrylamide copolymer superabsorbent polymer, with a water absorption ratio of 200-300 g / g. Polyacrylic acid superabsorbent polymer, aluminum stearate, and silane coupling agent KH560 are weighed separately in a weight ratio of 80:20:2. They are then mixed evenly in a mixer. The mixed material is then fed into a heating container and heated to 130°C. After the aluminum stearate is completely dissolved and evenly dispersed, it is fed into a high-speed centrifugal spray granulator. Through high-speed dispersion granulation, cooling, and collection, a modified superabsorbent polymer with a core-shell structure is obtained. The chopped carbon fibers are 3 mm in length and 6 μm in diameter. The silica content in the siliceous material is greater than 70%, and the structure is non-crystalline.

[0024] Example 2 As another preferred embodiment of the present invention, this embodiment provides a temperature-responsive self-healing cementing material for heavy oil thermal recovery, the specific components of which are as follows (in parts by weight): 40 parts of Grade A oil well cement; 43 parts of sulfosilicate cement; 14 parts of siliceous material; 3 parts of modified water-absorbing resin; 0.2 parts of chopped carbon fiber; The weight composition of sulfosilicate cement is as follows: calcium sulfoaluminate 17%, calcium sulfosilicate 45%, dicalcium silicate 30%, gypsum 8%, and the specific surface area of ​​sulfosilicate cement is 300 m². 2 / kg; The modified superabsorbent polymer (SAP) has a core-shell structure with a particle size of less than 200 mesh. The outer shell is magnesium stearate, and the core is acrylic-acrylamide copolymer superabsorbent polymer, with a water absorption ratio of 200-300 g / g. Polyacrylic acid superabsorbent polymer, magnesium stearate, and silane coupling agent KH570 are weighed separately in a weight ratio of 80:20:2. These are then mixed evenly in a mixer. The mixed material is then fed into a heating container and heated to 100°C. After the aluminum stearate is completely dissolved and evenly dispersed, it is fed into a high-speed centrifugal spray granulator. Through high-speed dispersion granulation, cooling, and collection, a modified superabsorbent polymer with a core-shell structure is obtained. The chopped carbon fibers are 6 mm in length and 6 μm in diameter. The silica content in the siliceous material is greater than 70%, and the structure is amorphous.

[0025] Example 3 As another preferred embodiment of the present invention, this embodiment provides a temperature-responsive self-healing cementing material for heavy oil thermal recovery, the specific components of which are as follows (in parts by weight): 45 parts of Grade G oil well cement; 36 parts of sulfosilicate cement; 17 parts of siliceous material; Two parts of modified water-absorbing resin; 0.2 parts of chopped carbon fiber; The weight composition of sulfosilicate cement is as follows: calcium sulfoaluminate 21%, calcium sulfosilicate 30%, dicalcium silicate 45%, gypsum 4%, and the specific surface area of ​​sulfosilicate cement is 350 m². 2 / kg; The modified superabsorbent polymer (SAP) has a core-shell structure with a particle size of less than 200 mesh. The outer shell is magnesium stearate, and the core is sodium polyacrylate superabsorbent polymer (SAP). The water absorption ratio is 200-300 g / g. SAP, magnesium stearate, and silane coupling agent KH570 are weighed separately in a weight ratio of 80:20:2. They are then mixed evenly in a mixer. The mixed material is then fed into a heating container and heated to 90°C. After the aluminum stearate is completely dissolved and evenly dispersed, it is fed into a high-speed centrifugal spray granulator. Through high-speed dispersion granulation, cooling, and collection, a modified SAP with a core-shell structure is obtained. The chopped carbon fibers are 4 mm in length and 7 μm in diameter. The silica content in the siliceous material is greater than 70%, and the structure is amorphous.

[0026] Example 4 As another preferred embodiment of the present invention, this embodiment provides a temperature-responsive self-healing cementing material for heavy oil thermal recovery, the specific components of which are as follows (in parts by weight): 53 portions of Class D oil well cement; 24 parts of sulfosilicate cement; 20 parts of siliceous material; 3 parts of modified water-absorbing resin; 0.3 parts of chopped carbon fiber; The weight composition of sulfosilicate cement is as follows: calcium sulfoaluminate 15%, calcium sulfosilicate 39%, dicalcium silicate 40%, gypsum 6%, and the specific surface area of ​​sulfosilicate cement is 332 m². 2 / kg; The modified superabsorbent polymer (SAP) has a core-shell structure with a particle size of less than 200 mesh. The outer shell is magnesium stearate, and the core is sodium polyacrylate superabsorbent polymer (SAP). The water absorption ratio is 200-300 g / g. SAP, magnesium stearate, and silane coupling agent KH570 are weighed separately in a weight ratio of 80:20:2. They are then mixed evenly in a mixer. The mixed material is then fed into a heating container and heated to 100°C. After the aluminum stearate is completely dissolved and evenly dispersed, it is fed into a high-speed centrifugal spray granulator. Through high-speed dispersion granulation, cooling, and collection, a modified SAP with a core-shell structure is obtained. The chopped carbon fibers are 3 mm in length and 8 μm in diameter. The silica content in the siliceous material is greater than 70%, and the structure is amorphous.

[0027] Comparative Example 1 The cement in this comparative example consists of 65 parts of G-grade oil well cement and 35 parts of quartz sand. In this comparative example, the G-grade high-oil-resistant cement meets the relevant requirements in GB / T10238-2015, and the silica content of the quartz sand is 95% with a particle size of 350 mesh.

[0028] Comparative Example 2 The cement in this comparative example consists of 64.7 parts of Grade G oil well cement, 35 parts of quartz sand, and 0.3 parts of chopped carbon fiber. In this comparative example, the Grade G high-resistance oil well cement meets the relevant requirements of GB / T10238-2015, the silica content of the quartz sand is 95%, the particle size is 350 mesh, and the length of the chopped carbon fiber is 3 mm.

[0029] Test case Based on the cement prepared in Examples 1-4 and Comparative Examples 1-2, 1.5% G33S water loss reducer and 0.3% USZ drag reducer were added respectively, with a water-cement ratio of 0.44. Cement slurry was then prepared according to the method specified in GB / T 19139 for the preparation of samples for thickening time, compressive strength, and permeability testing.

[0030] (1) Thickening time The thickening test was conducted at 50℃, and the thickening time was tested according to the method specified in GB / T19139. The test results are shown in Table 1. (2) Compressive strength test The prepared cement slurry was poured into a cement stone compressive strength test mold and formed. The mold was a cube with a side length of 50 mm (or 2 in). After filling the mold and covering it with a cover plate, it was placed in a 50℃ curing chamber for 7 days. Then it was placed in a pressure curing autoclave and heated to 350℃ for 7 days and 14 days. After curing, the compressive strength of the cement stone was tested on a pressure testing machine. The test results are shown in Table 1.

[0031] (3) Permeability testing The prepared cement slurry was poured into a permeability testing mold, the mold dimensions of which met the requirements of the sample holder for the cement stone permeability test mold in GB / T 19139. After loading the sample, it was placed in a curing chamber at 50℃ for 7 days, and then the permeability of the sample was measured. After the test, the sample was placed in a pressure curing autoclave and cured at 350℃ for 7 days. After curing, the permeability of the sample was measured again. After the test, the sample was placed in a curing chamber at 50℃ for 2 days of water bath curing, and the permeability of the sample was measured a third time. The test results are shown in Table 2. The pressure medium for permeability testing was water.

[0032]

[0033] Table 2 shows the permeability test data for Examples 1-4 and Comparative Examples 1-2.

[0034] Based on the data in Table 1 and Figure 1 , Figure 2 It can be seen that, under the same thickening experimental conditions, the thickening time of the cement slurry prepared in Examples 1-4 and Comparative Examples 1-2 is much shorter than that in Comparative Examples 1-2. This indicates that the cement slurry system of the present invention can quickly solidify and seal the formation while ensuring the safe time for cementing operations, avoiding water channeling damage to the cement sheath, and thus improving cementing quality. Secondly, according to Figure 1 It can be seen that the thickening curve of the self-healing cement slurry system is normal, the transition time is short, and the slurry is normal, meeting the requirements of cementing operations. In addition, after high-temperature curing at 350℃, the cement stone still has good mechanical properties, without obvious strength decay, and the compressive strength value is slightly better than that of comparative examples 1-2, meeting the performance requirements of cementing for heavy oil thermal recovery.

[0035] Table 2 shows the permeability test data for Examples 1-4 and Comparative Examples 1-2. The comparison data shows that the permeability test results of the six samples after curing at 60℃ for 7 days and at 350℃ for 7 days were not significantly different, exhibiting the same trend of change; after high-temperature curing, the permeability increased significantly in all samples. However, after curing again at 60℃ for 2 days, the permeability of Examples 1-4 was much lower than that of Comparative Examples 1-2. This indicates that under the 60℃ water bath curing condition, water entered the gaps in the samples, triggering the self-healing mechanism of the cement stone, sealing the internal pores, and significantly reducing the permeability of the cement stone. In contrast, the permeability test results of Comparative Examples 1-2 after curing at 60℃ and 350℃ were not significantly different.

[0036] Figure 3 The image shows a SEM image of the modified water-absorbing resin added to the self-healing heavy oil thermal recovery cement in Example 1. As can be seen from the image, the modified water-absorbing resin obtained through spray granulation has a predominantly spherical structure, indicating that magnesium stearate or aluminum stearate effectively encapsulates the water-absorbing resin, isolating it from contact with the cement slurry during cementing operations and ensuring that the water-absorbing resin effectively absorbs water and fills gaps in the later stages.

[0037] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit the invention, nor are they intended to limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. That is to say, any changes or refinements made to the main design concept and spirit of the present invention that are not of substantial significance, but whose technical problems are still consistent with the present invention, should be included within 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 are similarly included within the patent protection scope of the present invention.

Claims

1. A temperature-responsive self-healing cementing material for heavy oil thermal recovery, characterized in that: This self-healing cementing material for heavy oil thermal recovery comprises the following components by weight: 40-53 parts of cement for oil wells; 24-25 parts of sulfosilicate cement; 14-20 parts of siliceous material; 1-3 parts of modified water-absorbing resin; 0.1-0.3 parts of chopped carbon fiber; The modified water-absorbing resin has a core-shell structure with a particle size of less than 200 mesh. The outer shell is magnesium stearate or aluminum stearate, and the core is polyacrylic acid water-absorbing resin.

2. The temperature-responsive self-healing cementing material for heavy oil thermal recovery as described in claim 1, characterized in that: The modified water-absorbing resin is prepared by the following method, specifically, Weigh out polyacrylic acid superabsorbent resin, magnesium stearate or aluminum stearate, and silane coupling agent in a weight ratio of 80:20:2; mix them thoroughly in a mixer; transfer the thoroughly mixed material to a heating container and heat it to 90℃-130℃; after the magnesium stearate or aluminum stearate has completely dissolved and dispersed evenly, transfer it to a high-speed centrifugal spray granulator, and obtain a modified superabsorbent resin with a core-shell structure through high-speed dispersion granulation, cooling, and collection.

3. A temperature-responsive self-healing cementing material for heavy oil thermal recovery as described in claim 1 or 2, characterized in that: The water absorption ratio of the polyacrylic acid superabsorbent resin is 200-300 g / g; the powder particle size is less than 300 mesh.

4. The temperature-responsive self-healing cementing material for heavy oil thermal recovery as described in claim 2, characterized in that: The silane coupling agent is KH560 or KH570.

5. A temperature-responsive self-healing cementing material for heavy oil thermal recovery as described in claim 1 or 2, characterized in that: The polyacrylic water-absorbing resin is an acrylic-acrylamide copolymer water-absorbing resin or sodium polyacrylate water-absorbing resin.

6. A temperature-responsive self-healing cementing material for heavy oil thermal recovery as described in claim 1 or 2, characterized in that: The weight composition of the sulfosilicate cement, by weight percentage, is as follows: calcium sulfoaluminate 15%-21%, calcium sulfosilicate 30%-45%, dicalcium silicate 30%-45%, gypsum 4%-8%; the specific surface area of ​​the sulfosilicate cement is 300-350 m². 2 / kg.

7. A temperature-responsive self-healing cementing material for heavy oil thermal recovery as described in claim 1 or 2, characterized in that: The oil well cement is Grade A, Grade D, or Grade G oil well cement.

8. A temperature-responsive self-healing cementing material for heavy oil thermal recovery as described in claim 1 or 2, characterized in that: The silicon-based material contains more than 70% silicon dioxide and has an amorphous structure.

9. A temperature-responsive self-healing cementing material for heavy oil thermal recovery as described in claim 1 or 2, characterized in that: The chopped carbon fibers have a length of 3-6 mm and a diameter of 6-8 μm.

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