CN115849798A - High-strength temporary plugging cement for geothermal well based on surface modified ceramic and preparation method thereof - Google Patents
High-strength temporary plugging cement for geothermal well based on surface modified ceramic and preparation method thereof Download PDFInfo
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Abstract
The invention discloses high-strength temporary plugging cement for a geothermal well based on surface modified ceramics and a preparation method thereof, belonging to the technical field of new energy drilling plugging cement materials. The formula comprises the following components: 80-90 parts of G-grade oil well cement, 10-20 parts of surface modified ceramic particles and 0-3 parts of water-soluble polymer fibers/particles. The preparation method comprises the following steps: 1) Soaking the porous ceramic particles by using an aqueous solution of a water-soluble polymer polyvinyl alcohol to prepare surface-modified ceramic particles; 2) Uniformly mixing the raw materials to prepare a dry material; 3) Adding the dry materials and water into a cement paste mixer to prepare a slurry; 4) And injecting the slurry into a cube test mold for normal-temperature maintenance, and then continuously soaking in hot water to form the high-strength temporary plugging cement for the geothermal well, wherein the temperature of the hot water is not less than 90 ℃. The method is oriented to vast middle and low temperature geothermal resources, and the waste ceramic particles are used for partially replacing oil well cement, so that the method is favorable for promoting geothermal energy development, reducing greenhouse gas emission and protecting the environment.
Description
Technical Field
The invention relates to the field of new energy drilling plugging cement materials, in particular to high-strength temporary plugging cement for a geothermal well based on surface modified ceramics and a preparation method thereof.
Background
Geothermal energy is one of the most competitive energy sources for clean heating as a renewable clean energy source. The development and utilization of geothermal energy have important practical significance for national energy structure adjustment, energy conservation, emission reduction and environment improvement, and can generate profound influence. China is a large country with geothermal resources mainly at medium and low temperature, and currently, the developed resources are mainly hydrothermal type. In order to ensure geothermal energy production, geothermal wells are often arranged in reservoirs containing fractures and even karst cave types. Therefore, during the construction of the geothermal well, the contradiction that the stratum needs to be blocked during the drilling process and the stratum needs to be unblocked after the drilling process is finished in order to increase the productivity exists.
In the existing research, the preparation of degradable temporary plugging cement-based materials suitable for medium-low temperature and high-temperature geothermal wells according to the temperature change in the circulation of drilling fluid and the production process of hot water is carried out. However, the strength of the plugging cement is reduced sharply due to the addition of fly ash floating beads, polymer particles or fibers. And the waste ceramics with hardness, strong durability and stable properties are widely used for the research of improving the strength of cement-based materials. The waste ceramic is used for replacing cement products, so that waste can be utilized, the problems of carbon emission and pollution in the cement preparation process are reduced, and the environment is protected.
Although there are many examples of using ceramic waste in cement-based materials, there are still few application studies on alumina porous ceramics, and particularly, there is no report on preparing temporary plugging type cement suitable for medium-low temperature geothermal exploitation process after surface coating modification is performed on alumina porous ceramic particles by using water-soluble polymer.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides high-strength temporary plugging cement for a geothermal well based on surface modified ceramic and a preparation method thereof. The water-soluble polymer is used for wrapping the modified porous ceramic particles, and the problem that the strength of the temporary plugging cement of the existing geothermal well is sharply reduced is solved by adding the ceramic particles.
The purpose of the invention is realized by the following technical scheme:
the high-strength temporary plugging cement for the geothermal well based on the surface modified ceramic comprises, by weight, 80-90 parts of G-grade oil well cement, 10-20 parts of surface modified ceramic particles and 0-3 parts of water-soluble polymer fibers/particles.
Further, by weight, 80-87 parts of G-grade oil well cement, 10-20 parts of surface modified ceramic particles and 0-3 parts of water-soluble polymer fibers/particles.
Further, the surface modified ceramic particles are composed of porous ceramic particles and water-soluble polymer polyvinyl alcohol, and the water-soluble polymer polyvinyl alcohol is coated on the surfaces of the porous ceramic particles.
Further, the porous ceramic particles are alumina porous ceramic particles with the particle size of 2-5 mm.
Furthermore, the water-soluble polymer fiber/particle adopts high-temperature water-soluble polyvinyl alcohol fiber with the length of 6 to 12mm or polyvinyl alcohol particles with the particle size of 2-5 mm.
The preparation method of the geothermal well high-strength temporary plugging cement comprises the following steps:
s1: soaking the porous ceramic particles by using the water solution of the water-soluble polymer polyvinyl alcohol, and then filtering and drying the soaked porous ceramic particles to finally form the surface modified ceramic particles;
s2: drying and stirring the surface modified ceramic particles, the G-grade oil well cement and the water-soluble polymer fibers/particles according to the proportion, and stirring until the surface modified ceramic particles, the G-grade oil well cement and the water-soluble polymer fibers/particles are uniformly mixed to prepare a dry material;
s3: putting the dry material into a cement paste mixer, adding water into the cement paste mixer, and then stirring at a low speed for 120s, stopping stirring for 30s, and finally stirring at a high speed for 120s to prepare slurry;
s4: and injecting the slurry into a cube test mold for normal-temperature maintenance for 3 days, and then placing the cube test mold into hot water for soaking for more than 1 day to finally form the high-strength temporary plugging cement for the geothermal well.
Further, in the step S3, the ratio of the water to the dry materials is 0.4 to 0.6 in terms of weight ratio.
Further, in the step S4, the temperature of the hot water is not less than 90 ℃.
The invention has the beneficial effects that:
1) According to the invention, the surface of the porous ceramic particles is coated and modified by using the high-temperature water-soluble polymer, and the strength of the existing geothermal temporary plugging cement is improved by using the characteristics of hardness and strong durability of the ceramic. The surface of the porous ceramic particles is covered with a high-temperature water-soluble polymer film, so that the closed state of pores on the surface of the ceramic particles is maintained in the drilling process at a relatively low temperature. In high-temperature hot water with the temperature of over 90 ℃, the polymer film is dissolved, the pores on the surface and inside of the porous ceramic particles are released, and the polymer film and the pores formed by the dissolution of the water-soluble polymer fibers/particles together form a pore structure of the temporary geothermal plugging type cement, so that the temporary geothermal plugging type cement is finally prepared.
2) Aiming at the problem that the mechanical strength of the developed geothermal temporary plugging cement is greatly attenuated, the high-strength temporary plugging cement suitable for the construction process of medium and low temperature geothermal wells is prepared together based on the surface-modified porous ceramic particles and the water-soluble polymer fibers/particles. Because the alumina in the ceramic particles participates in and promotes the hydration reaction of the cement in the hot water, the strength of the prepared material after being soaked in the hot water is greatly improved. The invention aims at the development process of vast middle and low temperature geothermal energy in China, and the waste ceramic particles are used for partially replacing oil well cement, so that the development of geothermal energy is promoted, the emission of greenhouse gas is reduced, and the environment is protected.
Drawings
FIG. 1 is a schematic view of a process for preparing surface-coated modified ceramic particles;
FIG. 2 (A) is a cumulative pore size distribution plot of ceramic particles before and after modification; FIG. 2 (B) is a graph showing the differential pore size distribution of the ceramic particles before and after modification;
FIG. 3 is a schematic view of compressive strength of a material after various stages of curing;
FIG. 4 is a comparative graph of the liquid permeability of each sample after being soaked in hot water at 90 ℃;
FIG. 5 (A) is a microscopic scanning electron microscope image of the material in example 3 after room temperature curing for 3 days, and FIG. 5 (B) is a microscopic scanning electron microscope image of the material in example 3 after room temperature curing for 3 days and soaking in hot water at 90 ℃ for 1 day.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1 to 5, the present invention provides a technical solution:
the surface modified ceramic-based high-strength temporary plugging cement for the geothermal well comprises, by weight, 80-90 parts of G-grade oil well cement, 10-20 parts of surface modified ceramic particles and 0-3 parts of water-soluble polymer fibers/particles. Generally, by weight, 80-87 parts of G-grade oil well cement, 10-20 parts of surface modified ceramic particles and 0-3 parts of water-soluble polymer fibers/particles. The surface modified ceramic particles are composed of porous ceramic particles and water-soluble polymer polyvinyl alcohol, and the water-soluble polymer polyvinyl alcohol is coated on the surfaces of the porous ceramic particles. The porous ceramic particles are alumina porous ceramic particles with the particle size of 2-5 mm. The water-soluble polymer fiber/particle adopts high-temperature water-soluble polyvinyl alcohol fiber with the length of 6 to 12mm or polyvinyl alcohol particles with the particle size of 2-5 mm. Wherein, the G-grade oil well cement and the water-soluble polymer fiber/particle are all the prior art materials.
The preparation method of the geothermal well high-strength temporary plugging cement comprises the following steps:
(1) Soaking the porous ceramic particles by using an aqueous solution of a water-soluble polymer polyvinyl alcohol, and then filtering and drying the soaked porous ceramic particles to finally form the surface modified ceramic particles.
(2) The surface modified ceramic particles, the G-grade oil well cement and the water-soluble polymer fibers/particles are dried and stirred according to the proportion until the mixture is uniformly mixed to prepare a dry material.
(3) Firstly, placing the dry materials in a cement paste mixer, adding water into the cement paste mixer, then stirring at a low speed for 120s, stopping stirring for 30s, and finally stirring at a high speed for 120s to prepare slurry; the ratio of water to dry materials is 0.4 to 0.6 in terms of weight ratio.
(4) And injecting the slurry into a cube test mold for normal-temperature maintenance for 3 days, and then placing the cube test mold into hot water for soaking for more than 1 day to finally form the geothermal well high-strength temporary plugging cement, wherein the temperature of the hot water is not less than 90 ℃.
In all the following examples, alumina porous ceramic particles with a particle size of 2-5mm were used as the porous ceramic particles, high-temperature water-soluble polyvinyl alcohol fibers with a length of 6-12mm or polyvinyl alcohol particles with a particle size of 2-5mm were used as the porous ceramic particles, and the temperature of hot water was 90 ℃.
Example 1
The surface modified ceramic-based geothermal well high-strength temporary plugging cement comprises: 90 parts by weight of G-grade oil well cement, 10 parts by weight of surface modified ceramic particles and 0.44 weight ratio of water to dry materials.
The preparation method of the surface modified ceramic-based high-strength temporary plugging cement for the geothermal well comprises the following steps:
(1) Soaking the ceramic particles by using a polyvinyl alcohol aqueous solution, and filtering and drying the soaked ceramic particles to prepare surface modified ceramic particles;
(2) Drying and stirring the prepared surface modified ceramic particles and G-grade oil well cement until the surface modified ceramic particles and the G-grade oil well cement are uniformly mixed to prepare a dry material;
(3) And (3) placing the uniformly mixed dry materials into a cement paste mixer, adding water into a mixing container of the paste mixer, mixing at a low speed for 120s, stopping mixing for 30s, and mixing at a high speed for 120s, thus finishing the preparation of the slurry material for temporarily plugging the cement at high strength for the geothermal well based on the surface modified ceramic particles.
(4) And injecting the slurry into a cube test mold, curing at normal temperature for 3 days, and soaking in hot water for more than 1 day to form the high-strength temporary plugging cement for the geothermal well.
Example 2
The surface modified ceramic-based geothermal well high-strength temporary plugging cement comprises: 80 parts of G-grade oil well cement, 20 parts of surface modified ceramic particles and 0.44 percent of water and dry materials in parts by weight.
The preparation method of the surface modified ceramic-based high-strength temporary plugging cement for the geothermal well comprises the following steps:
(1) Soaking the ceramic particles by using a polyvinyl alcohol aqueous solution, and filtering and drying the soaked ceramic particles to prepare surface modified ceramic particles;
(2) Drying and stirring the prepared surface modified ceramic particles and G-grade oil well cement until the surface modified ceramic particles and the G-grade oil well cement are uniformly mixed to prepare a dry material;
(3) And (3) placing the uniformly mixed dry materials into a cement paste mixer, adding water into a mixing container of the paste mixer, mixing at a low speed for 120s, stopping mixing for 30s, and mixing at a high speed for 120s, so as to finish the preparation of the slurry material of the high-strength temporary plugging cement for the geothermal well based on the surface modified ceramic particles.
(4) And injecting the slurry into a cubic test mold, curing at normal temperature for 3 days, and soaking in hot water for more than 1 day to form the high-strength temporary plugging cement for the geothermal well.
Example 3
The surface modified ceramic-based geothermal well high-strength temporary plugging cement comprises: 87 parts of G-grade oil well cement, 10 parts of surface modified ceramic particles and 3 parts of water-soluble polymer particles by weight, wherein the weight ratio of water to dry materials is 0.44.
The preparation method of the surface modified ceramic-based high-strength temporary plugging cement for the geothermal well comprises the following steps:
(1) Soaking the ceramic particles by using a polyvinyl alcohol aqueous solution, and filtering and drying the soaked ceramic particles to prepare surface modified ceramic particles;
(2) Drying and stirring the prepared surface modified ceramic particles, G-grade oil well cement and water-soluble polymer particles until the surface modified ceramic particles, the G-grade oil well cement and the water-soluble polymer particles are uniformly mixed to prepare a dry material;
(3) And (3) placing the uniformly mixed dry materials into a cement paste mixer, adding water into a mixing container of the paste mixer, mixing at a low speed for 120s, stopping mixing for 30s, and mixing at a high speed for 120s, thus finishing the preparation of the slurry material for temporarily plugging the cement at high strength for the geothermal well based on the surface modified ceramic particles.
(4) And injecting the slurry into a cube test mold, curing at normal temperature for 3 days, and soaking in hot water for more than 1 day to form the high-strength temporary plugging cement for the geothermal well.
Example 4
The surface modified ceramic-based geothermal well high-strength temporary plugging cement comprises: 87 parts of G-grade oil well cement, 10 parts of surface modified ceramic particles and 3 parts of water-soluble polymer fibers, wherein the weight ratio of water to dry materials is 0.44.
The preparation method of the surface modified ceramic-based high-strength temporary plugging cement for the geothermal well comprises the following steps:
(1) Soaking the ceramic particles by using a polyvinyl alcohol aqueous solution, and filtering and drying the soaked ceramic particles to prepare the surface modified ceramic particles.
(2) And drying and stirring the prepared surface modified ceramic particles, G-grade oil well cement and water-soluble polymer fibers, and stirring until the mixture is uniformly mixed to prepare a dry material.
(3) And (3) placing the uniformly mixed dry materials into a cement paste mixer, adding water into a mixing container of the paste mixer, mixing at a low speed for 120s, stopping mixing for 30s, and mixing at a high speed for 120s, so as to finish the preparation of the slurry material of the high-strength temporary plugging cement for the geothermal well based on the surface modified ceramic particles.
(4) And injecting the slurry into a cube test mold, curing at normal temperature for 3 days, and soaking in hot water for more than 1 day to form the high-strength temporary plugging cement for the geothermal well.
Comparative example 1
The cement formulation of this comparative example included: by weight, 100 parts of G-grade oil well cement and 0.44 of water to dry material in weight ratio.
The preparation method of the comparative example comprises the following steps: and (3) placing the G-grade oil well cement into a cement paste mixer, adding water into a mixing container of the paste mixer, and performing low-speed mixing for 120s, stopping for 30s and high-speed mixing for 120s. The slurry was poured into a cube mold and cured at room temperature for 3 days, and then immersed in hot water for more than 1 day to form the comparative example.
Comparative example 2
The cement formulation of this comparative example included: 90 parts of G-grade oil well cement, 10 parts of unmodified ceramic particles and 0.44 of water to dry material in weight ratio.
The preparation method of the comparative example comprises the following steps: drying and stirring unmodified porous ceramic particles and G-grade oil well cement until the particles and the G-grade oil well cement are uniformly mixed to prepare a dry material; and (3) placing the mixed dry material in a cement paste mixer, adding water into a mixing container of the paste mixer, and performing low-speed mixing for 120s, stopping for 30s and high-speed mixing for 120s. The slurry was poured into a cubic test mold and cured at room temperature for 3 days, and then immersed in hot water for more than 1 day to form the comparative example.
Comparative example 3
The cement formulation of this comparative example included: 80 parts of G-grade oil well cement, 20 parts of unmodified ceramic particles and 0.44 of water to dry material in weight ratio.
The preparation method of this comparative example was identical to that of comparative example 2.
Table 1 shows the names and ingredient examples of examples 1 to 4 and comparative examples 1 to 3.
Table 1 ingredient table examples
| Number of | Name (R) | Cement (g) | Ceramic (g) | Polymer (g) | Water to dry material ratio | Ceramic type | Polymer morphology |
| Example 1 | GM10 | 90 | 10 | / | 0.44 | Modification of | / |
| Example 2 | GM20 | 80 | 20 | / | 0.44 | Modification of | / |
| Example 3 | GMP | 87 | 10 | 3 | 0.44 | Modification of | Granules |
| Example 4 | GMF | 87 | 10 | 3 | 0.44 | Modification of | Fiber |
| Comparative example 1 | |
100 | 0 | / | 0.44 | / | / |
| Comparative example 2 | GR10 | 90 | 10 | / | 0.44 | Unmodified | / |
| Comparative example 3 | GR20 | 80 | 20 | / | 0.44 | Unmodified | / |
FIG. 1 is a schematic view of a process for preparing surface-coated modified ceramic particles. The method comprises the following steps: dissolving water-soluble polymer fiber in hot water at 90 ℃ to form a polymer aqueous solution; soaking the porous ceramic particles in a polymer (polyvinyl alcohol adopted by the technology) aqueous solution at 90 ℃ for 24 hours; filtering by using a screen to obtain soaked porous ceramic particles; and (3) placing the ceramic particles in a vacuum drying oven at 60 ℃ for drying for 24 hours to obtain the water-soluble polymer surface-coated modified ceramic particles. The last step in the figure is the condition of coating the surface of the modified porous ceramic.
FIG. 2 (A) is a cumulative pore size distribution diagram of the ceramic particles before and after modification, and FIG. 2 (B) is a differential pore size distribution graph of the ceramic particles before and after modification. The unmodified and modified ceramic particles are denoted by the symbols R and M, respectively, in the figures. The cumulative pore size distribution plot shows that the total pore volume of the unmodified ceramic particles was 0.2277mL/g, while the surface coating was modified to reduce to 0.2169 mL/g. The differential curve of pore size distribution shows that the highest peak of pore size distribution of unmodified and surface-coated ceramic particles is around 1000nm, followed by 6 μm and 300 μm. The peak heights of the modified ceramic particles at these three locations were all reduced relative to the unmodified ceramic, indicating that surface coating modification reduced the pore size distribution in the ceramic over all ranges.
FIG. 3 is a schematic view of compressive strength of the cured material at different stages. The results showed that the strength of comparative examples 2, 3, 1 and 2 was significantly reduced compared to comparative example 1 after curing at room temperature for 3 days. It is indicated that the addition of ceramic particles is not beneficial to the increase of the strength of the cement material at normal temperature no matter whether the surface coating is carried out or not. The strength of comparative example 1 increased only from 21.70 to 24.21 with an increase of 11.57% after soaking in hot water at 90 ℃, while the increases of comparative example 2, comparative example 3, example 1 and example 2 were 158.16%, 157.36%, 177.15% and 155.85%, respectively. The addition of the porous ceramic can greatly improve the mechanical strength of the cement-based material in hot water at 90 ℃. The formulations of example 3 and example 4 were based on example 1, and 3% polyvinyl alcohol fibers or particles were used instead of a portion of the cement. After being soaked in hot water at 90 ℃, the strength of the steel plate in the embodiment 3 and the strength of the steel plate in the embodiment 4 are also greatly increased compared with the strength after being cured for 3 days at normal temperature, and the expansion ranges are 112.50 percent and 182.54 percent respectively. It is demonstrated that in the presence of 3% water-soluble polymer fiber or particle, the dissolution of the fiber or particle in hot water can weaken the structure of the cement-based material, but the porous ceramic can still play a role in obviously enhancing the strength of the cement-based material in high-temperature water.
FIG. 4 is a comparative graph of the liquid permeability of each sample after immersion in hot water at 90 ℃. The test equipment is a multifunctional high-temperature high-pressure core displacement device, the experiment pressure is 0.68MPa, and the experiment fluid is water. The results showed that, after soaking in hot water at 90 ℃ for 1 day, examples 2 to 4 all had higher permeability than comparative examples 1 to 3 except example 1. In particular, examples 3 and 4 had a liquid permeability of 0.4126mD and 1.6501mD, respectively. The high-strength temporary plugging cement prepared by the surface-coated modified ceramic particles and the water-soluble fibers/particles can be partially degraded in high-temperature hot water, and has a large liquid permeability measurement value, so that a channel is provided for the output of geothermal fluid.
FIG. 5 (A) is a microscopic scanning electron microscope image of the material in example 3 after room temperature curing for 3 days, and FIG. 5 (B) is a microscopic scanning electron microscope image of the material in example 3 after room temperature curing for 3 days and soaking in hot water at 90 ℃ for 1 day. The figure shows that after hot water soaking, the width of the microcracks between the ceramic particles and the cement matrix decreases. FIG. 5 (B) shows mineral particles in the cement matrix below the microcracks, where the surface of the mineral particles has increased pit depth due to hydration corrosion; above the microcracks are ceramic particles whose surface is seen to be covered by dense hydration products. The addition of the porous ceramic particles not only accelerates the hydration process of the cement raw materials in high-temperature hot water, but also promotes the rapid increase of the strength of the cement-based materials in the hot water because the ceramic particles participate in the hydration reaction of the cement.
In conclusion, the surface modified ceramic particles and the water-soluble polymer fibers/particles are utilized to jointly prepare the high-strength temporary plugging cement suitable for the construction process of the medium-low temperature geothermal well. The material can be partially degraded in high-temperature hot water, presents a larger liquid permeability measurement value, and provides a channel for the production of geothermal fluid. The ceramic particles participate in and promote hydration reaction of cement in high-temperature water, thereby promoting rapid increase of the strength of the cement-based material. The invention aims at the development process of medium and low temperature geothermal energy, and the waste ceramic particles are used for partially replacing oil well cement, thereby being beneficial to promoting the development of geothermal energy, reducing the emission of greenhouse gases and protecting the environment.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. Surface modified ceramic-based geothermal well high-strength temporary plugging cement is characterized in that: the high-strength temporary plugging cement comprises, by weight, 80-90 parts of G-grade oil well cement, 10-20 parts of surface modified ceramic particles and 0-3 parts of water-soluble polymer fibers/particles.
2. The surface modified ceramic-based geothermal well high-strength temporary plugging cement according to claim 1, wherein: 80-87 parts of G-grade oil well cement, 10-20 parts of surface modified ceramic particles and 0-3 parts of water-soluble polymer fibers/particles in parts by weight.
3. The surface modified ceramic-based geothermal well high-strength temporary plugging cement according to claim 2, wherein: the surface modified ceramic particles are composed of porous ceramic particles and water-soluble polymer polyvinyl alcohol, and the water-soluble polymer polyvinyl alcohol is coated on the surfaces of the porous ceramic particles.
4. The surface modified ceramic-based geothermal well high-strength temporary plugging cement according to claim 3, wherein: the porous ceramic particles are alumina porous ceramic particles with the particle size of 2-5 mm.
5. The surface modified ceramic-based geothermal well high-strength temporary plugging cement according to claim 3, wherein: the water-soluble polymer fiber/particle adopts high-temperature water-soluble polyvinyl alcohol fiber with the length of 6-12mm or polyvinyl alcohol particles with the particle size of 2-5 mm.
6. The method for preparing the geothermal well high-strength temporary plugging cement according to any one of claims 3 to 5, wherein the method comprises the following steps: the preparation method comprises the following steps:
s1: soaking the porous ceramic particles by using the water solution of the water-soluble polymer polyvinyl alcohol, and then filtering and drying the soaked porous ceramic particles to finally form the surface modified ceramic particles;
s2: drying and stirring the surface modified ceramic particles, the G-grade oil well cement and the water-soluble polymer fibers/particles according to the proportion, and stirring until the surface modified ceramic particles, the G-grade oil well cement and the water-soluble polymer fibers/particles are uniformly mixed to prepare a dry material;
s3: putting the dry material into a cement paste mixer, adding water into the cement paste mixer, and then stirring at a low speed for 120s, stopping stirring for 30s, and finally stirring at a high speed for 120s to prepare slurry;
s4: and injecting the slurry into a cube test mold for normal-temperature maintenance for 3 days, and then placing the cube test mold into hot water for soaking for more than 1 day to finally form the high-strength temporary plugging cement for the geothermal well.
7. The method of manufacturing according to claim 6, characterized in that: in the step S3, the ratio of the water to the dry materials is 0.4-0.6 by weight.
8. The method of claim 6, wherein: in the step S4, the temperature of the hot water is not less than 90 ℃.
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