CN109652037B - High-temperature stable cement slurry and preparation method thereof - Google Patents
High-temperature stable cement slurry and preparation method thereof Download PDFInfo
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- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
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- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
Abstract
The application discloses high-temperature stable cement paste and a preparation method thereof. The high-temperature stable cement slurry comprises 100 parts by weight of oil well cement, 5-15 parts by weight of micro silicon, 35-40 parts by weight of silicon powder, 0.2-0.5 part by weight of defoaming agent, 0.5-2 parts by weight of high-temperature dispersing agent, 0.15-0.7 part by weight of cellulose fluid loss additive, 0.1-0.5 part by weight of polyacrylamide fluid loss additive, 1-3 parts by weight of high-temperature retarder and 40-60 parts by weight of water. The method comprises the following steps: uniformly mixing oil well cement, micro-silicon and silicon powder to obtain a dry mixture; under the condition of stirring, adding water, a defoaming agent, a high-temperature dispersing agent, a cellulose fluid loss agent, a polyacrylamide fluid loss agent and a high-temperature retarder into a container in sequence, and uniformly mixing to obtain a wet mixed material; and uniformly mixing the dry mixture and the wet mixture to obtain the high-temperature stable cement slurry. The high-temperature stable cement paste has good stability and rheological property at high temperature, and the API water loss amount is less.
Description
Technical Field
The application relates to a high-temperature cement cementing technology, in particular to high-temperature stable cement slurry and a preparation method thereof.
Background
In high-temperature deep well operation, a high-temperature resistant cement slurry system is required to ensure the safety of construction operation. For high-temperature cement slurry, the system stability at high temperature is an important index, which not only influences the well cementation quality, but also relates to the well cementation construction safety. At high temperature, the molecular motion in the cement paste system is intensified, the intermolecular viscous force is reduced, the suspension stability of the system is poor, the sedimentation of cement particles with higher density and smaller specific surface area is accelerated, and the cement paste system is unstable.
At present, the research on improving the high-temperature stability of cement paste mainly focuses on two points. Firstly, the proportion of solid phase materials such as cement, silicon powder, micro-silicon, superfine materials and the like in the cement paste is optimized by adopting particle grading, and the solid phase bulk density is improved so as to improve the high-temperature stability of the cement paste. The disadvantages of this method are: the addition proportion of different materials is greatly influenced by the material batch and the performance, once the material batch and the performance are changed, the particle grading experiment needs to be carried out again to find the proper proportion among different materials. Inorganic solid phase materials such as micro-silicon, superfine materials and the like have small temperature sensitivity and can effectively improve the high-temperature stability of the cement paste, but because the particles are small and the specific surface area is large, the mixing time and the initial consistency of the cement paste can be obviously influenced, the addition amount needs to be strictly controlled, and the density is 1.9-2.0g/cm3The conventional density cement slurry of (2) generally requires that the addition amount of microsilica, ultrafine materials and the like is less than 5% BWOC (mass percentage relative to cement). Secondly, a suitable high temperature resistant stabilizer is sought. The conventional stabilizer is mainly a high-molecular polymer, but has obvious thickening effect at low temperature, so that cement mixing and stirring are difficult at low temperature, the rheological property of the cement is poor, pumping is difficult in construction operation, the displacement efficiency is low, and the well cementation quality is poor; the adsorption capacity of the polymer to cement particles is reduced due to the breakage of molecular bonds at high temperature, so that the effect of the polymer on improving the stability of cement paste at high temperature is not obvious. Therefore, no completely effective high temperature stabilizer is available on the market at present.
Since the current domestic cementing operation mainly uses the grade G cement, the research is mainly directed to the grade G cement, and the research on the grade H cement is less, and the grade H cement is mainly used in the gulf of Mexico. The G-grade cement has small particle size and large specific surface area, so that the prepared cement slurry system has good stability; the H-level cement has coarse particle size and poor suspension stability, and the difficulty of preparing the cement paste with good high-temperature stability is higher. Therefore, the method overcomes the serious sedimentation of the H-grade cement slurry at high temperature, improves the high-temperature stability of the cement slurry, and is an important problem for well cementation service operation in Mexico areas when a well cementation service company leaves China.
Disclosure of Invention
The application provides a cement paste is stabilized to high temperature, has solved the cement paste especially uses the unstable problem of cement paste that H level cement was prepared under high temperature.
Specifically, the application provides a high-temperature stable cement slurry, which comprises the following components:
in embodiments of the present application, the high temperature stable cement slurry may include the following components:
in embodiments of the present application, the cellulosic fluid loss additive may be carboxymethyl hydroxyethyl cellulose.
In an embodiment of the present application, the polyacrylamide-based fluid loss additive may be 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) -N, N dimethylacrylamide-maleic acid copolymer.
In the embodiment of the application, the cellulose fluid loss additive and the polyacrylamide fluid loss additive can be added into the high-temperature stable cement slurry in a manner of adding the fluid loss additive A and the fluid loss additive B. In the present application, "fluid loss agent a" is defined as a substance having the above-mentioned cellulose-based fluid loss agent as an active ingredient, and "fluid loss agent B" is defined as a substance having the above-mentioned polyacrylamide-based fluid loss agent as an active ingredient.
The fluid loss agent A can also comprise other auxiliary materials such as mineral oil, a dispersing agent and the like besides an effective component cellulose fluid loss agent, and the mineral oil and the dispersing agent can improve the dispersibility of the cellulose fluid loss agent and cannot influence the performance of high-temperature stable cement paste. When the fluid loss agent A consists of a cellulose fluid loss agent, mineral oil and a dispersing agent, the mass fraction of the cellulose fluid loss agent in the fluid loss agent A is within the range of 30-35%. The fluid loss additive a may be obtained commercially, for example, as PC-G34L (composed of carboxymethyl hydroxyethyl cellulose, polycarboxylate and mineral oil, wherein the mass fraction of carboxymethyl hydroxyethyl cellulose is 30% to 35%) purchased from MERASI (mexico) company. In the high-temperature stable cement slurry, the addition amount of the fluid loss additive A with the mass fraction of the effective components within the range of 30-35% can be 0.5-2 parts by weight based on 100 parts by weight of the addition amount of the oil well cement.
The fluid loss agent B can also comprise impurity impurities generated in the preparation of the polyacrylamide fluid loss agent, such as water, unreacted raw materials, reaction byproducts and the like, besides the effective component polyacrylamide fluid loss agent, and the impurities do not influence the performance of the high-temperature stable cement slurry. When the fluid loss agent B consists of the polyacrylamide fluid loss agent and impurity impurities generated during preparation of the polyacrylamide fluid loss agent, the mass fraction of the polyacrylamide fluid loss agent in the fluid loss agent B is within the range of 20-25%. The fluid loss agent B may be obtained commercially, for example, PC-G80L (composed of AMPS-N, N dimethylacrylamide-maleic acid copolymer, N dimethylacrylamide, maleic acid, and water, wherein the mass fraction of AMPS-N, N dimethylacrylamide-maleic acid copolymer is 20% to 25%) purchased from midsea oilfield service company, ltd. In the high-temperature stable cement slurry, the addition amount of the fluid loss additive B with the mass fraction of the effective components within the range of 20-25% can be 0.5-2 parts by weight based on 100 parts by weight of the addition amount of the oil well cement.
In the examples of the present application, the high temperature stable cement slurry may further include 1-2 parts by weight of latex.
In embodiments of the present application, the oil well cement may be selected from either or both of class H and class G cements.
In the present application, the high temperature dispersant means a dispersant capable of enduring at least 100 ℃. In an embodiment of the present application, the high temperature dispersant may be selected from any one or more of lignosulfonate, polyamine sulfonate, and polycarboxylate high temperature dispersants.
In this application, the high temperature retarder means a retarder capable of withstanding at least 100 ℃. In the embodiments of the present application, the high temperature retarder may be selected from any one or both of lignosulfonates and polyacrylamides.
In the embodiment of the present application, the particle size of the microsilica may be 0.1-0.5 μm, and the particle size of the silicon powder may be 50-60 μm.
In the embodiment of the application, the latex can adopt the latex commonly used in oilfield cementing cement slurry.
The application also provides a preparation method of the high-temperature stable cement slurry, which comprises the following steps:
uniformly mixing oil well cement, micro-silicon and silicon powder to obtain a dry mixture;
under the condition of stirring, adding water, a defoaming agent, a high-temperature dispersing agent, a cellulose fluid loss agent, a polyacrylamide fluid loss agent, a high-temperature retarder and optionally latex into a container in sequence, and uniformly mixing to obtain a wet mixed material;
and uniformly mixing the dry mixture and the wet mixture to obtain the high-temperature stable cement slurry.
When the wet mixed material is prepared, water is firstly added as a solvent, then a defoaming agent is added to prevent subsequent foaming, and then a high-temperature dispersing agent is added to facilitate the subsequent addition of a component with higher viscosity and then the subsequent uniform dissolution is realized; some latexes may thicken the cement slurry after addition to the cement slurry, and the last optional latex is added to avoid this phenomenon.
The following beneficial effects can be obtained by the application:
1. according to the application, the cellulose filtrate reducer and the polyacrylamide filtrate reducer are compounded, so that a synergistic effect is obtained in the aspect of improving the high-temperature stability and the rheological property of cement paste, the rheological property and the sedimentation stability of the cement paste are obviously improved, and the API (American Petroleum institute) water loss is less compared with the cement paste prepared by independently using the cellulose filtrate reducer or the polyacrylamide filtrate reducer under the same addition;
2. according to the method, the high-temperature dispersing agent is introduced into the cement paste, so that the addition amount of the micro-silicon in the cement paste is greatly increased, and the high-temperature stability of a cement paste system is further improved;
3. when latex is introduced into the cement paste, the high temperature stability of the cement paste can be further improved. In a common well cementation cement slurry system, latex is often used as a gas channeling preventing agent, but the latex is a suspension system and has the characteristics of high viscosity, good suspension stability, small temperature sensitivity and the like, so that the stability of the cement slurry system can be obviously improved by adding a proper amount of latex into a high-temperature cement slurry system.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the present application may be realized and attained by the structure particularly pointed out in the written description.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail to make objects, technical solutions and advantages of the present application more apparent. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Table 1 basic information of part of the raw materials used in the examples
Note: fluid loss additive A (PC-G34L) was tested to consist of 35 wt% carboxymethyl hydroxyethyl cellulose, 8 wt% of a polydisperse carboxylate, and 57 wt% mineral oil; fluid loss agent B (PC-G80L) consisted of 25 wt% AMPS-N, N dimethylacrylamide-maleic acid copolymer, 5 wt% N, N dimethylacrylamide, 5 wt% maleic acid, and 63 wt% water;
the particle size of the micro silicon is 0.1-0.5 μm, and the particle size of the silicon powder is 50-60 μm;
the tolerance temperature range of the high-temperature retarder PC-H31L is 100-200 ℃;
the high-temperature dispersant CDI-33 has a tolerance temperature of more than 100 ℃.
Example 1
The density of the prepared product is 1.90g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts by weight of H-grade cement, 15 parts by weight of micro-silicon, 35 parts by weight of silicon powder, 0.25 part by weight of defoaming agent, 0.5 part by weight of high-temperature dispersing agent, 1.2 parts by weight of fluid loss additive A, 0.8 part by weight of fluid loss additive B, 1.2 parts by weight of high-temperature retarder, 1.5 parts by weight of latex and 53.53 parts by weight of water.
The high-temperature stable cement slurry of the embodiment is prepared by the following method:
(1) uniformly mixing oil well cement, micro-silicon and silicon powder to obtain a dry mixture;
(2) under the condition of stirring, adding water, a defoaming agent, a high-temperature dispersing agent, a fluid loss agent A, a fluid loss agent B, a high-temperature retarder and latex into a container in sequence, and uniformly mixing to obtain a wet mixed material;
(3) and uniformly mixing the dry mixture and the wet mixture to obtain the high-temperature stable cement slurry.
Example 2
The preparation density is 2.0g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts by weight of H-grade cement, 10 parts by weight of micro-silicon, 40 parts by weight of silicon powder, 0.25 part by weight of defoaming agent, 0.75 part by weight of high-temperature dispersing agent, 0.8 part by weight of fluid loss agent A and 1.2 parts by weight of water loss agent AThe water loss agent B comprises, by weight, 1.5 parts of a high-temperature retarder, 1.2 parts of latex and 42.68 parts of water.
See example 1 for the preparation method.
Example 3
The density of the prepared product is 1.90g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts by weight of H-grade cement, 15 parts by weight of micro-silicon, 35 parts by weight of silicon powder, 0.25 part by weight of defoaming agent, 0.5 part by weight of high-temperature dispersing agent, 1.5 parts by weight of fluid loss additive A, 0.5 part by weight of fluid loss additive B, 1.2 parts by weight of high-temperature retarder, 1.5 parts by weight of latex and 53.53 parts by weight of water.
See example 1 for the preparation method.
Example 4
The density of the prepared product is 1.90g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts by weight of H-grade cement, 15 parts by weight of micro-silicon, 35 parts by weight of silicon powder, 0.25 part by weight of defoaming agent, 0.5 part by weight of high-temperature dispersing agent, 0.5 part by weight of fluid loss agent A, 1.5 parts by weight of fluid loss agent B, 1.2 parts by weight of high-temperature retarder, 1.5 parts by weight of latex and 53.53 parts by weight of water.
See example 1 for the preparation method.
Example 5
The density of the prepared product is 1.90g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts of G-grade cement, 5 parts of micro silicon, 35 parts of silicon powder, 0.25 part of defoaming agent, 0.5 part of high-temperature dispersing agent, 1.2 parts of fluid loss agent A, 0.8 part of fluid loss agent B, 1.5 parts of high-temperature retarder, 1.5 parts of latex and 53.63 parts of water.
See example 1 for the preparation method.
Example 6
The preparation density is 2.0g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts by weight of H-grade cement, 13 parts by weight of micro-silicon, 40 parts by weight of silicon powder, 0.25 part by weight of defoaming agent, 1.25 parts by weight of high-temperature dispersing agent, 0.8 part by weight of fluid loss additive A and 1.2 parts by weight of fluid loss additiveWater agent B, 1.5 parts by weight of high-temperature retarder, 1.2 parts by weight of latex and 45.47 parts by weight of water.
See example 1 for the preparation method.
Example 7
The density of the prepared product is 1.90g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts by weight of H-grade cement, 15 parts by weight of micro-silicon, 35 parts by weight of silicon powder, 0.25 part by weight of defoaming agent, 0.5 part by weight of high-temperature dispersing agent, 1.5 parts by weight of fluid loss agent A, 1 part by weight of fluid loss agent B, 1.2 parts by weight of high-temperature retarder and 53.03 parts by weight of water.
The high-temperature stable cement slurry of the embodiment is prepared by the following method:
(1) uniformly mixing oil well cement, micro-silicon and silicon powder to obtain a dry mixture;
(2) under the condition of stirring, adding water, a defoaming agent, a high-temperature dispersing agent, a fluid loss agent A, a fluid loss agent B and a high-temperature retarder into a container in sequence, and uniformly mixing to obtain a wet mixed material;
(3) and uniformly mixing the dry mixture and the wet mixture to obtain the high-temperature stable cement slurry.
Example 8
The density of the prepared product is 1.90g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts of H-grade cement, 15 parts of micro silicon, 40 parts of silicon powder, 0.25 part of defoaming agent, 1.5 parts of high-temperature dispersing agent, 2 parts of fluid loss agent A, 2 parts of fluid loss agent B, 3 parts of high-temperature retarder, 1.5 parts of latex and 54.98 parts of water.
See example 1 for the preparation method.
Example 9
The preparation density is 2.0g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts by weight of H-grade cement, 15 parts by weight of micro-silicon, 40 parts by weight of silicon powder, 0.25 part by weight of defoaming agent, 2 parts by weight of high-temperature dispersing agent, 0.8 part by weight of fluid loss additive A, 1.2 parts by weight of fluid loss additive B, 1.5 parts by weight of high-temperature retarder, 1.2 parts by weight of latex and 45.37 parts by weight of water。
See example 1 for the preparation method.
Example 10
The preparation density is 2.0g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts of H-grade cement, 15 parts of micro silicon, 40 parts of silicon powder, 0.25 part of defoaming agent, 2 parts of high-temperature dispersing agent, 1.5 parts of fluid loss additive A, 2 parts of fluid loss additive B, 3 parts of high-temperature retarder, 1.2 parts of latex and 42.77 parts of water.
See example 1 for the preparation method.
Example 11
The density of the prepared product is 1.90g/cm3The high-temperature stable cement slurry consists of the following raw materials: 100 parts of G-grade cement, 8 parts of micro silicon, 35 parts of silicon powder, 0.25 part of defoaming agent, 1.5 parts of high-temperature dispersing agent, 1.5 parts of fluid loss agent A, 2 parts of fluid loss agent B, 3 parts of high-temperature retarder, 1.5 parts of latex and 51.4 parts of water.
See example 1 for the preparation method.
Comparative example 1
This comparative example differs from example 1 only in that: the weight portion of the fluid loss agent A is 2, and the weight portion of the fluid loss agent B is 0.
Comparative example 2
This comparative example differs from example 1 only in that: 0 part by weight of fluid loss additive A and 2 parts by weight of fluid loss additive B.
Comparative example 3
This comparative example differs from example 5 only in that: the weight portion of the fluid loss agent A is 2, and the weight portion of the fluid loss agent B is 0.
Comparative example 4
This comparative example differs from example 5 only in that: 0 part by weight of fluid loss additive A and 2 parts by weight of fluid loss additive B.
Comparative example 5
This comparative example differs from example 8 only in that: 4 parts of fluid loss additive A and 0 part of fluid loss additive B.
Comparative example 6
This comparative example differs from example 8 only in that: 0 part by weight of fluid loss additive A and 4 parts by weight of fluid loss additive B.
Performance testing
1. The cement slurries of examples 1, 3, 4 and comparative examples 1-2 were examined for API water loss and settling stability at 150 ℃ according to the industry standard API RP 10B-2. The results are shown in Table 2.
TABLE 2 Effect of fluid loss additive A, B on Cement slurry API loss of water and settling stability (class H cement)
It can be seen that the density difference of the cement columns of the cement paste prepared by adopting the compound fluid loss additive is obviously smaller than that of the cement paste prepared by adopting the single fluid loss additive A and the single fluid loss additive B, and the smaller the density difference of the cement columns is, the better the stability of the cement paste is, which indicates that the synergistic effect is obtained after the fluid loss additive A and the fluid loss additive B are compounded in the aspect of improving the high-temperature stability of the cement paste. Although not wishing to be bound by theory, the inventor analyzes that N-H … O hydrogen bonds are formed between N-H bonds in polyacrylamide molecules and H-O bonds in cellulose molecules, the attractive force of the hydrogen bonds enhances the intermolecular force of the two types of fluid loss additives, a space network structure is formed in cement paste, the viscosity of the cement paste and the binding to solid-phase particles are improved, the sedimentation speed of the solid-phase particles such as cement is slowed down, and the high-temperature stability of a cement paste system is improved.
In the aspect of improving the rheological property of the cement paste (the higher the fluidity is, the better the rheological property of the cement paste is), the effect of the compounded fluid loss additive on improving the rheological property of the cement paste is not between that of the single fluid loss additive A and the fluid loss additive B, which indicates that the compounding of the fluid loss additive A and the fluid loss additive B is not the simple mixing of the fluid loss additive A and the fluid loss additive B, and the synergistic effect is obtained after the compounding.
In the aspect of improving the water loss reducing performance of the cement paste, although the effect of the compounded fluid loss additive on reducing the API water loss of the cement paste is between that of the single fluid loss additive A and that of the fluid loss additive B, the compounded fluid loss additive is closer to that of the single fluid loss additive B with a better effect, so that the API water loss of the cement paste is lower.
2. The slurries of example 5 and comparative examples 3-4 were examined for API water loss and settling stability at 150 ℃ according to the industry standard API RP 10B-2. The results are shown in Table 3.
TABLE 3 Effect of fluid loss additive A, B on Cement slurry API loss of water and settling stability (class G cement)
It can be seen that fluid loss additives a and B also exhibit synergistic effects in cement slurries formulated with grade G cement.
The investigation result proves that the filtrate loss reducer A and the filtrate loss reducer B are mixed according to the ratio of 0.5-2% BWOC: after being compounded in a ratio of 0.5-2% BWOC, the cement paste can obtain a synergistic effect on the aspects of improving the high-temperature stability and the rheological property of the cement paste in both H-grade cement paste and G-grade cement paste; and ensures that the cement slurry has a low API water loss.
3. According to the industry standard API RP 10B-2, the properties of the high-temperature stable cement paste of each embodiment, such as the API water loss, the fluidity, the compressive strength and the like, are examined at 150 ℃. The results are shown in Table 4.
TABLE 4 Properties of the high temperature Stable cement slurries of the examples (150 deg.C)
It can be seen that the high-temperature stable cement paste of the embodiments of the present application has good properties at 150 ℃, and meets construction requirements, for example, fast ash mixing, high fluidity, no free liquid, little water loss, good sedimentation stability, adjustable thickening time, and high compressive strength. In addition, by adjusting the proportion between the fluid loss additive A and the fluid loss additive B, the rheological property and the stability of the cement slurry with different densities can be conveniently adjusted, and the cement slurry with different densities can meet the operation requirement.
It can be seen from examples 2, 6 and 9 that the addition of microsilica can be increased while maintaining the fluidity and stability of the cement slurry by appropriately increasing the amount of the high-temperature dispersant.
It can be seen from example 7 that, under the condition of not adding latex, the cement paste can still maintain good performances such as rheological property, water loss and sedimentation stability by properly increasing the adding amount of the fluid loss additive A and the fluid loss additive B.
4. The slurries of example 8 and comparative examples 5-6 were examined for API water loss and settling stability at 180 ℃ according to the industry standard API RP 10B-2. The results are shown in Table 5.
Table 5 effect of fluid loss agent A, B on cement slurry API fluid loss and settling stability
It can be seen that the fluid loss additive A and the fluid loss additive B can show good synergistic effect in high-temperature cement slurry at 180 ℃.
In addition, the performance of the high temperature stable cement slurries of examples 8, 10 and 11 at 180 ℃ was also examined. The results are shown in Table 6.
TABLE 6 Properties of high temperature Stable cement slurries of examples (180 deg.C)
It can be seen that the high-temperature cement paste of the embodiment of the application can resist the temperature of 180 ℃.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (5)
1. A high temperature stable cement slurry, characterized in that the high temperature stable cement slurry comprises the following components:
wherein the high-temperature dispersant is selected from one or more of lignosulfonate, polyamine sulfonate and polycarboxylate high-temperature dispersants;
the cellulose fluid loss agent is carboxymethyl hydroxyethyl cellulose;
the polyacrylamide fluid loss agent is a copolymer of 2-acrylamide-2-methylpropanesulfonic acid-N, N-dimethylacrylamide-maleic acid;
the high-temperature retarder is selected from one or two of lignosulfonate and polyacrylamide high-temperature retarder;
the particle size of the micro silicon is 0.1-0.5 μm, and the particle size of the silicon powder is 50-60 μm.
2. The high temperature stable cement slurry of claim 1, wherein the high temperature stable cement slurry comprises the following components:
3. the high temperature stable cement slurry of claim 1 or 2, further comprising 1-2 parts by weight of a latex.
4. A high temperature stable cement slurry according to claim 1 or 2, wherein the oil well cement is selected from any one or both of class H and class G cements.
5. Method for preparing a high temperature stable cement slurry according to any of claims 1 to 4, characterized in that it comprises:
uniformly mixing oil well cement, micro-silicon and silicon powder to obtain a dry mixture;
under the condition of stirring, adding water, a defoaming agent, a high-temperature dispersing agent, a cellulose fluid loss agent, a polyacrylamide fluid loss agent, a high-temperature retarder and optionally latex into a container in sequence, and uniformly mixing to obtain a wet mixed material;
and uniformly mixing the dry mixture and the wet mixture to obtain the high-temperature stable cement slurry.
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