Carbon dioxide self-healing cement slurry system for well cementing and preparation method and application thereof

Abstract

The application provides a cementing carbon dioxide self-healing cement slurry system and a preparation method and application thereof. The cement slurry system comprises oil well cement, carbon dioxide self-healing agent, silicon dioxide, corrosion inhibitor and water. When carbon dioxide channeling occurs due to micro-cracks or micro-gaps in the cement sheath, the carbon dioxide self-healing agent in the cement slurry system will swell under the stimulation of carbon dioxide, automatically seal the micro-cracks or micro-gaps, thereby inhibiting carbon dioxide channeling and ensuring that the cement sheath continuously has excellent sealing performance. Meanwhile, the carbon dioxide self-healing agent has good compatibility in the cement slurry system, so that the finally obtained cement slurry system has excellent corrosion resistance, self-healing property, toughness and channeling resistance, is suitable for a temperature interval of 30-100 DEG C and can be used for cementing of carbon drive oil and storage.

Description

Technical Field

[0001] This invention belongs to the field of oilfield development technology, specifically relating to a self-healing cement slurry system for cementing that reacts with carbon dioxide, its preparation method, and its application. Background Technology

[0002] Cementing operations are a crucial part of oilfield development, and the performance of cement slurry has a vital impact on cementing quality. During oilfield development, the complex and variable formation conditions place high demands on the cement slurry system, requiring excellent corrosion resistance, toughness, anti-channeling properties, and self-healing properties upon gas exposure. However, the cement sheath formed by the cement slurry system is a brittle material, easily damaged and cracked under external forces. This can easily lead to oil and gas channeling during cementing operations, and in severe cases, cause annular pressure or wellhead gas leakage, affecting the lifespan of oil and gas wells and production safety. Therefore, developing a cement slurry system that combines excellent corrosion resistance, toughness, anti-channeling properties, and self-healing properties upon gas exposure has been a key research focus in this field.

[0003] Currently, there are many reported cement slurry systems for cementing. CN112939527A discloses an ultra-high strength and toughness cement slurry system for cementing, its preparation and application. The raw material composition of the ultra-high strength and toughness cement slurry system includes: 100 parts by weight of cement, 20-40 parts by weight of high-temperature reinforcing material, 0.5-6 parts by weight of inorganic toughening material, 0.5-4 parts by weight of suspension stabilizer, 2-6 parts by weight of microsilica, 0.5-1.5 parts by weight of dispersant, 2-6 parts by weight of fluid loss reducing agent, 1-8 parts by weight of retarder, 0.2-1 parts by weight of defoamer, and 40-60 parts by weight of clean water. This cement slurry system has the advantages of good fluidity, settling stability, low fluid loss, adjustable thickening time, and wide temperature range.

[0004] However, the cement slurry system, including the inventions mentioned above, does not have self-healing properties. It cannot automatically seal the internal microcracks or gaps caused by the damage of the brittle cement sheath by external forces, and cannot guarantee that the cement sheath maintains excellent sealing performance, which will seriously affect the life of oil and gas wells and production safety.

[0005] Therefore, in order to solve the above-mentioned technical problems, developing a self-healing cement slurry system for cementing that is self-healing upon contact with carbon dioxide remains an urgent technical problem to be solved in this field. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a self-healing cement slurry system for cementing upon contact with carbon dioxide, its preparation method, and its application. This cement slurry system possesses excellent corrosion resistance, self-healing properties, toughness, and anti-channeling properties, meeting the needs of oilfield cementing operations, improving cementing quality, and extending the service life of oil wells. It is particularly suitable for carbon-driven oil recovery, utilization, and storage wells. To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a self-healing cement slurry system for cementing that is exposed to carbon dioxide, the cement slurry system comprising oil well cement, a self-healing agent exposed to carbon dioxide, silica, a corrosion inhibitor and water.

[0008] The self-healing cement slurry system for cementing provided by this invention comprises oil well cement, a carbon dioxide self-healing agent, silica, a corrosion inhibitor, and water. Because the cement slurry system contains a carbon dioxide self-healing agent, when microcracks or gaps appear in the cement sheath formed after cementing operations, leading to carbon dioxide leakage, the carbon dioxide self-healing agent expands under the stimulation of carbon dioxide, automatically sealing the microcracks or gaps and inhibiting carbon dioxide leakage. This ensures that the cement sheath maintains excellent sealing performance. Furthermore, the carbon dioxide self-healing agent has good compatibility with other components of the cement slurry system, requiring no changes to the construction process and equipment. The construction process is the same as with conventional cement slurry systems, ultimately resulting in a cement slurry system with excellent corrosion resistance, self-healing properties, toughness, and anti-leakage properties, suitable for carbon flooding and burial (CCUS) cementing in the temperature range of 30–100℃.

[0009] Preferably, the cement slurry system comprises the following components by weight:

[0010]

[0011]

[0012] In this invention, the amount of oil well cement used in the cement slurry system is 100 parts by weight.

[0013] In this invention, the amount of the carbon dioxide self-healing agent is 5 to 30 parts by weight, for example, 5 parts by weight, 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight or 30 parts by weight, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0014] In this invention, the amount of silicon dioxide used is 0.5 to 60 parts by weight, for example 0.5 parts by weight, 5 parts by weight, 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight or 50 parts by weight, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0015] In this invention, the amount of the corrosion inhibitor is 0.5 to 20 parts by weight, for example 0.5 parts by weight, 2 parts by weight, 5 parts by weight, 8 parts by weight, 12 parts by weight, 16 parts by weight or 20 parts by weight, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0016] In this invention, the amount of water used is 40 to 100 parts by weight, for example 40 parts by weight, 50 parts by weight, 60 parts by weight, 70 parts by weight, 80 parts by weight, 90 parts by weight or 100 parts by weight, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0017] Preferably, the oil well cement is Grade G oil well cement.

[0018] Preferably, the carbon dioxide self-healing agent includes any one or a combination of at least two of calcium oxide whiskers, carbon nanotubes, graphite oxide, or polymer polyols; the combination includes, but is not limited to: a combination of calcium oxide whiskers and carbon nanotubes, a combination of carbon nanotubes and graphite oxide, a combination of carbon nanotubes and polymer polyols, a combination of carbon nanotubes, calcium oxide whiskers, and polymer polyols, etc.

[0019] The calcium oxide whiskers react with carbon dioxide to form rod-shaped calcium carbonate, which then acts as a filler and support; the carbon nanotubes and graphite oxide react with carbon dioxide to cause the material to expand, which in turn acts as a filler and support; the polymer polyol reacts with carbon dioxide to form polyurethane resin, which creates an adhesive structure that promotes the re-bonding of cement cracks and achieves a sealing effect.

[0020] Preferably, the D of the calcium oxide whiskers 50 The particle size is 10 to 80 μm, for example 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm or 80 μm, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0021] Preferably, the carbon nanotubes have a D 50The particle size is 10 to 100 μm, for example 10 μm, 20 μm, 40 μm, 60 μm, 80 μm or 100 μm, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0022] Preferably, the D of the graphite oxide 50 The particle size is 100-500 nm, for example 100 nm, 200 nm, 300 nm, 400 nm or 500 nm, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0023] It should be noted that the present invention does not have any special requirements or restrictions on the specific type and molecular weight of the polymer polyol, as long as it can react with carbon dioxide to form an adhesive structure. However, in order to achieve the best sealing effect, the polymer polyol preferably includes vinyl polymer grafted polyether polyol.

[0024] Preferably, the dioxide comprises any one or a combination of at least two of silicon powder, microsilicon, or nanosilicon.

[0025] Preferably, the D of the microsilicon 50 The particle size is 1 to 10 μm, for example 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0026] Preferably, the D of the nano-silicon 50 The particle size is 100-300nm, for example 100nm, 120nm, 140nm, 160nm, 180nm, 200nm, 220nm, 240nm, 260nm, 280nm or 300nm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0027] Preferably, the silicon powder has a D 50 Particle sizes ≥ 50 μm, such as 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm or 90 μm, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0028] Preferably, the corrosion inhibitor includes any one or a combination of at least two of the following: dispersible latex powder, high-temperature resistant resin, slag powder, or volcanic ash; wherein the high-temperature resistant resin refers to a resin that can withstand a high temperature of 150°C.

[0029] Preferably, the cement slurry system also includes other functional admixtures, and weighting or weight-reducing materials can be added according to actual cementing needs.

[0030] Preferably, the other functional additives include any one or a combination of at least two of toughening agents, anti-gas channeling agents, expanding agents, water loss reducing agents, dispersants, setting regulators, reinforcing agents, or defoamers.

[0031] Preferably, based on 100 parts by weight of the oil well cement, the amount of the toughening agent is 0.1 to 5 parts by weight, for example, 0.1 parts by weight, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, or 5 parts by weight, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0032] Preferably, based on 100 parts by weight of the oil well cement, the amount of the anti-gas channeling agent is 0.5 to 5 parts by weight, for example, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, or 5 parts by weight, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0033] Preferably, based on 100 parts by weight of the oil well cement, the amount of the expanding agent is 0.1 to 3 parts by weight, for example, 0.1 parts by weight, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, or 3 parts by weight, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0034] Preferably, based on 100 parts by weight of the oil well cement, the amount of the fluid loss reducing agent is 0.5 to 3 parts by weight, for example, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, or 3 parts by weight, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0035] Preferably, based on 100 parts by weight of the oil well cement, the amount of the dispersant is 0.1 to 2 parts by weight, for example, 0.1 parts by weight, 0.3 parts by weight, 0.6 parts by weight, 0.9 parts by weight, 1.1 parts by weight, 1.3 parts by weight, 1.5 parts by weight, 1.7 parts by weight, 1.9 parts by weight, or 2 parts by weight, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0036] Preferably, based on 100 parts by weight of the oil well cement, the content of the setting regulator is 0.5 to 4 parts by weight, for example 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, or 4 parts by weight, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0037] Preferably, based on 100 parts by weight of the oil well cement, the amount of the reinforcing agent is 0.5 to 10 parts by weight, for example, 0.5 parts by weight, 1 part by weight, 2 parts by weight, 4 parts by weight, 6 parts by weight, 8 parts by weight, or 10 parts by weight, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0038] Preferably, based on 100 parts by weight of the oil well cement, the amount of the defoamer is 0.1 to 1 part by weight, for example, 0.1, 0.2, 0.4, 0.6, 0.8 or 1 part by weight, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0039] In this invention, there are no special restrictions on the specific types of the other functional admixtures mentioned above. However, in order to ensure that the resulting cement slurry system has the best corrosion resistance, self-healing properties, toughness, and anti-channeling properties, the following preferred types of the other functional admixtures are selected:

[0040] Preferably, the toughening agent comprises GWI-100S and / or GWI-200S.

[0041] Preferably, the anti-gas channeling agent includes any one of GWT-100S, GWT-200S, or GWT-300S.

[0042] Preferably, the expanding agent includes either GWP-1S or GWP-100S.

[0043] Preferably, the water loss reducing agent includes any one of GWF-200L, GWF-200S, or GWF-120S.

[0044] Preferably, the dispersant includes any one of GWD-1S, GWD-1L, or GWD-100L.

[0045] Preferably, the setting regulator includes any one of GWA-1S, GWA-2S, GWR-100L, GWR-200L, GWR-300L or GWR-310L.

[0046] Preferably, the reinforcing agent includes any one of GWB-1S, GWB-2S, GWB-3S, or GWB-100S.

[0047] Preferably, the defoamer includes GWX-1L and / or GWX-2L.

[0048] Preferably, the density of the cement slurry system is 1.80–1.90 g / cm³. 3 For example, 1.82 g / cm³ 3 1.84 g / cm 3 1.86 g / cm 3 Or 1.88g / cm 3 The specific point values ​​between the above point values ​​are not exhaustively listed here due to space limitations and for the sake of brevity.

[0049] Preferably, the cement stone formed by the cement slurry system has a permeability growth rate of ≤15% and a strength degradation rate of ≤20% after 60 days under carbon dioxide curing.

[0050] Preferably, the cement stone formed by the cement slurry system exhibits a penetration reduction rate of ≥30% after cracking under carbon dioxide curing for 60 days.

[0051] Preferably, the 7-day elastic modulus of the cement stone formed by the cement slurry system is <6.0 GPa.

[0052] Preferably, the static gelling transition time of the cement slurry system is <30 min.

[0053] Preferably, the thickening transition time of the cement slurry system is <30 min.

[0054] Preferably, the 24-hour compressive strength of the cement paste system is >16MPa, and the 48-hour compressive strength of the cement paste is >24MPa.

[0055] Preferably, the 7-day linear expansion rate of the cement slurry system is 0 to 0.2%.

[0056] In a second aspect, the present invention provides a method for preparing a self-healing cement slurry system for cementing as described in the first aspect, the method comprising: mixing oil well cement, a self-healing agent in the presence of carbon dioxide, silica, a corrosion inhibitor and water evenly, and optionally adding other functional additives to mix, thereby obtaining the cement slurry system.

[0057] Thirdly, the present invention provides an application of the self-healing cement slurry system for cementing upon contact with carbon dioxide as described in the first aspect in the development of carbon oil fields.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] (1) The self-healing cement slurry system for cementing that comes into contact with carbon dioxide provided by the present invention has excellent corrosion resistance, self-healing properties, toughness and anti-channeling properties, which can meet the needs of oilfield cementing operations, improve cementing quality and extend the service life of oil wells.

[0060] (2) The self-healing cement slurry system for cementing that is exposed to carbon dioxide provided by the present invention has a fast self-healing speed and can effectively seal microcracks or microgap generated by cement sheath in 5 to 10 minutes.

[0061] (3) The carbon dioxide self-healing agent added to the cement slurry system for cementing provided by the present invention can be fully dispersed in cement, so that the resulting cement slurry has good stability and good compatibility with other components. There is no need to change the construction process and equipment, and the construction process is the same as that of conventional cement slurry system. Detailed Implementation

[0062] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0063] The following is some information about the raw materials involved in the specific implementation method:

[0064] Calcium oxide whiskers: their D 50 The particle size is 50 μm;

[0065] Carbon nanotubes: their D 50 The particle size is 80 μm;

[0066] Graphite oxide: its D 50 The particle size is 200 nm;

[0067] Polymer polyols: specifically vinyl polymer-grafted polyether polyols, purchased from Shandong Huayou Wanda Chemical Co., Ltd.;

[0068] Microsilicon: its D 50 The particle size is 5 μm;

[0069] Nano silicon: its D 50 The particle size is 200 nm;

[0070] Silicon powder: its D 50 The particle size is 60 μm;

[0071] Dispersible latex powder: specifically, solid styrene-butadiene latex toughening agent powder, purchased from Rizhao Jinhu Jinma Chemical Co., Ltd., brand name GPL-S1;

[0072] High-temperature resistant resin: purchased from Shandong Huayou Wanda Chemical Co., Ltd.;

[0073] Slag powder: specific surface area ≥ 400m² 2 / kg, with an activity index of approximately 48% for A3 and over 98% for A28;

[0074] Volcanic ash: Specifically, it is a new type of ultrafine volcanic ash powder material, purchased from Beijing Zhengyuan Yiqing Materials Co., Ltd., with the grade name MS1250;

[0075] Toughening agent: specifically GWI-100S;

[0076] Anti-gas channeling agent: specifically GWT-100S;

[0077] Expanding agent: specifically GWP-1S;

[0078] Water loss reducer: specifically GWF-200L;

[0079] Dispersant: specifically GWD-1S;

[0080] Setting regulator: specifically GWA-1S;

[0081] Reinforcing agent: specifically GWB-1S;

[0082] Defoamer: specifically GWX-1L.

[0083] Examples 1-9 and Comparative Example 1

[0084] Examples 1-9 and Comparative Example 1 provide a self-healing cement slurry system for cementing in the presence of carbon dioxide. Comparative Example 1 provides a cement slurry system, the components and dosages of which are shown in Table 1. The dosage of each component in Table 1 is in "g".

[0085] Table 1

[0086]

[0087]

[0088] The preparation methods of the cement slurry system provided in Examples 1-9 and Comparative Example 1 include: mixing G-grade oil well cement, carbon dioxide self-healing agent, silica, corrosion inhibitor and water evenly, and adding other functional additives to obtain the cement slurry system.

[0089] Performance testing:

[0090] (1) The basic properties of the cement slurry systems provided in Examples 1 to 9 and Comparative Example 1 were tested. The test methods and test results are summarized in Table 2.

[0091] Table 2

[0092]

[0093] Based on the data in Table 2, we can conclude that:

[0094] The cement grout systems provided in Examples 1-9 all exhibit good basic properties, pass the test for gas channeling prevention, and have a 7-day linear expansion rate of 0.06-0.17%. Furthermore, their 24-hour compressive strength reaches 16.4-25.3 MPa, and their 48-hour compressive strength reaches 24.6-31.9 MPa. In contrast, the cement grout system provided in Comparative Example 1, lacking the addition of a carbon dioxide self-healing agent, fails the test for gas channeling prevention. Its 7-day linear expansion rate is -0.05%, indicating that not only did it not expand, but it even contracted. Simultaneously, its 24-hour compressive strength is only 14.4 MPa, and its 24-hour compressive strength is only 21.7 MPa.

[0095] (2) The self-healing and corrosion resistance of the cement slurry systems provided in Examples 1-9 and Comparative Example 1 were tested. The test methods and test results are summarized in Table 3.

[0096] Table 3

[0097]

[0098] As can be seen from the data in Table 3, the cement slurry systems provided in Examples 1 to 9 also possess excellent corrosion resistance and self-healing properties. Corrosion resistance tests show that the 60-day permeability increase rate is only 8.8% to 12.9%, and the 60-day strength decay rate is only 12.2% to 17.4%. Self-healing tests show that the self-healing permeability reduction rate is as high as 31.4% to 34.4%. In contrast, the cement slurry system provided in Comparative Example 1 does not possess self-healing properties because it does not contain a carbon dioxide self-healing agent, and its corrosion resistance is also poor.

[0099] The applicant declares that this invention illustrates a self-healing cement slurry system for well cementing upon contact with carbon dioxide, its preparation method, and its application through the above embodiments. However, this invention is not limited to the above process steps, meaning that this invention does not necessarily rely on the above process steps to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials used in this invention, additions of auxiliary components, and selection of specific methods all fall within the protection and disclosure scope of this invention.

Claims

1. A self-healing cement slurry system for cementing upon contact with carbon dioxide, characterized in that, The cement slurry system includes oil well cement, a carbon dioxide self-healing agent, silica, a corrosion inhibitor, and water; The carbon dioxide self-healing agent includes any one or a combination of at least two of the following: calcium oxide whiskers, carbon nanotubes, graphite oxide, and polymer polyols. The cement slurry system comprises the following components by weight: 100 parts by weight of oil well cement; 5-30 parts by weight of self-healing agent in contact with carbon dioxide; 0.5 to 50 parts by weight of silicon dioxide; Corrosion inhibitor 0.5~20 parts by weight; 40-100 parts by weight of water; The polymer polyol is a vinyl polymer grafted polyether polyol.

2. The cement slurry system according to claim 1, characterized in that, The oil well cement is Grade G oil well cement.

3. The cement slurry system according to claim 1, characterized in that, The D of the calcium oxide whiskers 50 The particle size is 10~80μm.

4. The cement slurry system according to claim 1, characterized in that, The carbon nanotubes D 50 The particle size is 10~100 μm.

5. The cement slurry system according to claim 1, characterized in that, The D of the graphite oxide 50 The particle size is 100~500nm.

6. The cement slurry system according to claim 1, characterized in that, The silicon dioxide includes any one or a combination of at least two of silicon powder, micro silicon, and nano silicon.

7. The cement slurry system according to claim 1, characterized in that, The corrosion inhibitor includes any one or a combination of at least two of the following: dispersible latex powder, high-temperature resistant resin, slag powder, and volcanic ash.

8. The cement slurry system according to claim 1, characterized in that, The cement slurry system also includes other functional admixtures.

9. The cement slurry system according to claim 8, characterized in that, The other functional additives include any one or a combination of at least two of the following: toughening agents, anti-gas channeling agents, expanding agents, water loss reducing agents, dispersants, setting regulators, reinforcing agents, and defoamers.

10. The cement slurry system according to claim 1, characterized in that, The density of the cement slurry system is 1.80~1.90 g / cm³. 3 .

11. A method for preparing a self-healing cement slurry system for cementing upon contact with carbon dioxide as described in any one of claims 1 to 10, characterized in that, The preparation method includes: mixing oil well cement, carbon dioxide self-healing agent, silica, corrosion inhibitor and water evenly, and adding optional other functional additives to obtain the cement slurry system.

12. The application of a self-healing cement slurry system for cementing upon contact with carbon dioxide as described in any one of claims 1 to 10, characterized in that, The applications include cementing engineering for oil and gas field development with carbon dioxide or for carbon dioxide utilization wells.

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