CN111153642A - Glycine modified carbon nanotube/glycine modified carbon nanotube well cementing cement slurry and preparation method thereof - Google Patents
Glycine modified carbon nanotube/glycine modified carbon nanotube well cementing cement slurry and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—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
- 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
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Abstract
The invention discloses glycine modified carbon nanotube/glycine modified carbon nanotube well cementing cement slurry and a preparation method thereof, wherein amide groups on the surface of modified carbon nanotubes can improve the dispersibility of the carbon nanotubes, and the glycine modified carbon nanotube well cementing cement slurry is applied to fixed cement to prepare the glycine modified carbon nanotube well cementing cement slurry and comprises the following raw materials in parts by weight: 100 parts of oil well cement, 1-2 parts of fluid loss additive, 0.2-0.4 part of oil well cement dispersant, 0.01-0.1 part of glycine modified carbon nanotube, 0.05-0.2 part of defoaming agent and 44 parts of clear water; meanwhile, discloses a preparation method of the glycine modified carbon nanotube well cementation cement slurry. The glycine modified carbon nanotube well cementation cement slurry provided by the invention enhances the mechanical property of the cement slurry, and simultaneously eliminates the influence of a dispersing agent on the performance of the carbon nanotube well cementation cement slurry.
Description
Technical Field
The invention belongs to the technical field of well cementation cement paste, and particularly relates to glycine modified carbon nanotube/glycine modified carbon nanotube well cementation cement paste and a preparation method thereof.
Background
In recent years, with the development of large-scale volume fracturing technology, the problems of production and potential safety hazards caused by sealing failure of a cement ring outside a sleeve after fracturing of a compact oil horizontal well and a compact gas well is completed are highlighted, and the research on the scheme for developing the integrity of a shaft of a fracturing well is not slow. The research on the aspect obtains some results, but has respective defects, and the excessive size of the material reduces the internal binding force of the cement stone, which is an important factor influencing the application of the cement stone. Therefore, researchers have attempted to improve the toughness of the cement paste by using a material with a smaller volume and a nanometer dimension, wherein carbon nanotubes have been one of the hot spots of research due to their ultra-high tensile strength and high elastic strain. The carbon nanotube cement, concrete and cement mortar are studied more. The current research on carbon nanotube oil well cement which requires both engineering construction performance and later-stage mechanical toughness under certain temperature and pressure is still incomplete. Liu Jian et al, Liu Hui Ting et al, and Feng Yusi respectively in its scientific and technological article on the oil well cement doped with carbon nanotube performance change research, mainly with the help of dispersant to carbon nanotube dispersion, has obtained better experimental effect. However, as the amount of the carbon nanotubes increases, the amount of the dispersant increases, and the excessive dispersant has a large influence on the properties such as thickening and rheology of oil well cement.
Taking the existing dispersing agent Arabic gum with good effect and high recognition degree in the aspect of carbon nanotube dispersion as an example. Respectively preparing carbon nano tube + Arabic gum (double-factor) cement slurry and Arabic gum (single-factor) cement slurry with different concentrations, wherein the mass ratio of the Arabic gum to the carbon nano tubes in the double-factor cement slurry is 5:1, the adding amount range of the Arabic gum in the two experimental cement slurries is 0-0.30%, and a blank sample is the basic formula cement slurry. The thickening time and the 72-hour compressive strength were measured, and the results are shown in Table 1. As can be seen from the table, the performance of the cement paste can be properly improved by mixing and adding the Arabic gum and the carbon nano tubes, but the effect exertion of the carbon nano tubes is influenced by the addition of the Arabic gum, which is mainly because the Arabic gum generates a serious retardation effect on the cement paste, when the addition (single factor of the Arabic gum) is increased to 0.30%, the cement paste is not coagulated after being stirred for 600 min, and the compressive strength of 72h is reduced to be below 10MPa, so that the engineering application of the cement paste is seriously influenced. Therefore, it is necessary to study the carbon nanotube oil well cement composite material without a dispersant.
The following table shows the effect of different amounts of gum arabic on the cement slurry properties
In view of the above disadvantages, the present invention adopts a glycine modification method to chemically modify the surface of the carbon nanotube, and the amide group on the surface of the modified carbon nanotube can improve the polarity of the carbon nanotube to improve the dispersibility thereof, and can improve the binding force between the carbon nanotube and the cement hydration product to a certain extent due to the characteristic of strong adsorbability thereof, so that the glycine modification of the carbon nanotube is favorable for improving the performance of the carbon nanotube cementing slurry.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a glycine modified carbon nanotube, glycine modified carbon nanotube well cementing cement slurry and a preparation method thereof, aiming at improving the overall mechanical property of the carbon nanotube cement slurry.
The glycine modified carbon nanotube is prepared by the following method, and the glycine modified carbon nanotube is prepared by the following components in parts by weight:
(1) weighing 1 part of carboxylated carbon nanotube, and sequentially adding 10 parts of dichloromethane, 1.2 parts of oxalyl chloride and 0.1 part of DMF (dimethyl formamide) to obtain a mixed solution A; stirring the mixed solution A at room temperature overnight, removing the solvent by rotary evaporation, recovering a black solid at the bottom layer, washing, carrying out suction filtration, and drying to obtain an acyl chlorinated carbon nanotube;
(2) and (2) taking 1 part of the acylchlorinated carbon nanotube prepared in the step (1), sequentially adding 10 parts of dichloromethane, 1.2 parts of glycine and 2 parts of triethylamine, stirring at room temperature to fully mix, then adding 35 parts of saturated sodium bicarbonate solution with the mass fraction of 8% to carry out quenching reaction, removing the solvent by rotary evaporation, filtering and recovering a bottom layer black solid, washing with deionized water, carrying out suction filtration, drying and weighing to obtain the glycine modified carbon nanotube.
A glycine modified carbon nanotube well cementation cement slurry is composed of the following raw materials in parts by weight: 100 parts of oil well cement, 1-2 parts of fluid loss additive, 0.2-0.4 part of oil well cement dispersant, 0.01-0.1 part of glycine modified carbon nano tube, 0.05-0.2 part of defoaming agent and 44 parts of clear water.
The glycine modified carbon nanotube well cementation cement slurry is prepared from the following raw materials in parts by weight: 100 parts of oil well cement, 1.5 parts of fluid loss additive, 0.3 part of oil well cement dispersant, 0.1 part of glycine modified carbon nano tube, 0.1 part of defoaming agent and 44 parts of clear water.
Preferably, the oil well cement is a grade G oil well cement.
Preferably, the fluid loss additive is a polymer.
Preferably, the defoaming agent is of the silicone type.
Preferably, the polymer is polyvinyl alcohol, 2-acrylamido-2-methylpropanesulfonic acid, hydroxyethyl sesbania, hydroxyethyl cellulose or hydroxypropyl cellulose, but is not limited to the above.
Preferably, the silicone is polydimethylsiloxane, polyether modified polysiloxane, fluorosilicone, ethylene glycol siloxane or dimethicone, but is not limited to the above.
A preparation method of glycine modified carbon nanotube well cementation cement slurry comprises the following steps:
(1) mixing oil well cement and a fluid loss agent according to a proportion to obtain a solid mixture;
(2) mixing clear water, glycine modified carbon nanotubes and a defoaming agent, and carrying out ultrasonic treatment for 25-30min under the power of 400W to obtain a mixed solution B;
(3) and (3) adding the solid mixture obtained in the step (1) into the mixed solution B obtained in the step (2) under the stirring condition of the rotating speed of 3500r/min, and then continuously stirring the mixed solution B for 50-60 s at the rotating speed of 12000 r/min to obtain the amino acid modified carbon nanotube well cementation cement slurry.
The invention has the advantages that:
(1) the glycine-modified carbon nano tube has more hydrophilic functional groups, has larger molecular polarity than the traditional hydroxyl or carboxyl modified carbon nano tube, improves the dispersing capacity of the glycine-modified carbon nano tube in a water phase, is beneficial to the uniform dispersion of the carbon nano tube in oil well cement slurry, and can exert the excellent properties of the carbon nano tube, and the experimental result shows that the mechanical property and the uniform stability of the oil well cement slurry are improved;
(2) after the glycine modified carbon nano tube is added into the well cementation cement slurry provided by the invention, the mechanical property of the cement slurry is obviously enhanced, the 24-hour compressive strength is improved by more than 30%, and the tensile strength is improved by more than 50%. On the other hand, the method (the prior art) of modifying the carbon nano tube by itself instead of adding the dispersing agent is adopted to improve the dispersing effect of the carbon nano tube, so that the influence of the dispersing agent on the performance of the carbon nano tube well cementation cement slurry is eliminated, and the method has great application value.
Drawings
FIG. 1 is a schematic diagram of glycine modification of carbon nanotubes.
FIG. 2 front and back infrared characteristics of carbon nanotube glycine modification.
FIG. 3 shows the results of centrifugal tests before and after modification of carbon nanotubes.
Detailed Description
Example 1
The glycine-modified carbon nanotube is prepared by the following method:
(1) weighing 1 part of carboxylated carbon nanotube, and sequentially adding 10 parts of dichloromethane, 1.2 parts of oxalyl chloride and 0.1 part of DMF (dimethyl formamide) to obtain a mixed solution A; stirring the mixed solution A at room temperature overnight, removing the solvent by rotary evaporation, recovering a black solid at the bottom layer, washing, carrying out suction filtration, and drying to obtain an acyl chlorinated carbon nanotube;
(2) and (2) mixing the acyl chloride carbon nanotubes prepared in the step (1), sequentially adding 10 parts of dichloromethane, 1.2 parts of glycine and 2 parts of triethylamine, stirring at room temperature to fully mix, then adding 35 parts of saturated sodium bicarbonate solution with the mass fraction of 8% to carry out quenching reaction, removing the solvent by rotary evaporation, filtering and recovering black solids at the bottom layer, washing with deionized water, carrying out suction filtration, drying and weighing to obtain the glycine modified carbon nanotubes.
Example 2
The preparation method of the glycine-modified carbon nanotube is the same as that of example 1;
1. a glycine modified carbon nanotube well cementation cement slurry is composed of the following raw materials in parts by weight: 100 parts of oil well cement, 1 part of fluid loss additive, 0.4 part of oil well cement dispersant, 0.01 part of glycine modified carbon nano tube, 0.2 part of defoaming agent and 44 parts of clear water;
the oil well cement is G-grade oil well cement;
the fluid loss agent is a polymer fluid loss agent, and is specifically but not limited to polyvinyl alcohol, 2-acrylamido-2-methylpropanesulfonic acid, hydroxyethyl sesbania, hydroxyethyl cellulose or hydroxypropyl cellulose;
the defoaming agent is organic silicon, and is particularly but not limited to polydimethylsiloxane, polyether modified polysiloxane, fluorosilicone, ethylene glycol siloxane or dimethicone;
2. a preparation method of glycine modified carbon nanotube well cementation cement slurry comprises the following steps:
(1) mixing oil well cement and a fluid loss agent according to a proportion to obtain a solid mixture;
(2) mixing clear water, glycine modified carbon nanotubes and a defoaming agent, and carrying out ultrasonic treatment for 25min under the power of 400W to obtain a mixed solution B;
(3) and (3) adding the solid mixture obtained in the step (1) into the mixed solution B obtained in the step (2) under the stirring condition of the rotating speed of 3500r/min, and then continuously stirring for 60s at the rotating speed of 12000 r/min to obtain the amino acid modified carbon nanotube well cementation cement slurry.
Example 3
The preparation method of the glycine-modified carbon nanotube is the same as that of example 1;
1. a glycine modified carbon nanotube well cementation cement slurry is composed of the following raw materials in parts by weight: 100 parts of oil well cement, 2 parts of fluid loss additive, 0.2 part of oil well cement dispersant, 0.05 part of glycine modified carbon nano tube, 0.05 part of defoaming agent and 44 parts of clear water;
the oil well cement is G-grade oil well cement;
the fluid loss agent is a polymer fluid loss agent, and is specifically but not limited to polyvinyl alcohol, 2-acrylamido-2-methylpropanesulfonic acid, hydroxyethyl sesbania, hydroxyethyl cellulose or hydroxypropyl cellulose;
the defoaming agent is organic silicon, and is particularly but not limited to polydimethylsiloxane, polyether modified polysiloxane, fluorosilicone, ethylene glycol siloxane or dimethicone;
2. a preparation method of glycine modified carbon nanotube well cementation cement slurry comprises the following steps:
(1) mixing oil well cement and a fluid loss agent according to a proportion to obtain a solid mixture;
(2) mixing clear water, glycine modified carbon nanotubes and a defoaming agent, and carrying out ultrasonic treatment for 30min under the power of 400W to obtain a mixed solution B;
(3) and (3) adding the solid mixture obtained in the step (1) into the mixed solution B obtained in the step (2) under the stirring condition of the rotating speed of 3500r/min, and then continuously stirring for 50s at the rotating speed of 12000 r/min to obtain the amino acid modified carbon nanotube well cementation cement slurry.
Example 4
The preparation method of the glycine-modified carbon nanotube is the same as that of example 1;
1. a glycine modified carbon nanotube well cementation cement slurry is composed of the following raw materials in parts by weight: 100 parts of oil well cement, 1.5 parts of fluid loss additive, 0.3 part of oil well cement dispersant, 0.1 part of glycine modified carbon nano tube, 0.1 part of defoaming agent and 44 parts of clear water;
the oil well cement is G-grade oil well cement;
the fluid loss agent is a polymer fluid loss agent, and is specifically but not limited to polyvinyl alcohol, 2-acrylamido-2-methylpropanesulfonic acid, hydroxyethyl sesbania, hydroxyethyl cellulose or hydroxypropyl cellulose;
the defoaming agent is organic silicon, and is particularly but not limited to polydimethylsiloxane, polyether modified polysiloxane, fluorosilicone, ethylene glycol siloxane or dimethicone;
2. a preparation method of glycine modified carbon nanotube well cementation cement slurry comprises the following steps:
(1) mixing oil well cement and a fluid loss agent according to a proportion to obtain a solid mixture;
(2) mixing clear water, glycine modified carbon nanotubes and a defoaming agent, and carrying out ultrasonic treatment for 27min under the power of 400W to obtain a mixed solution B;
(3) and (3) adding the solid mixture obtained in the step (1) into the mixed solution B obtained in the step (2) under the stirring condition of the rotating speed of 3500r/min, and then continuously stirring for 50s at the rotating speed of 12000 r/min to obtain the amino acid modified carbon nanotube well cementation cement slurry.
The carboxyl carbon nanotubes before and after the glycine modification in examples 1 to 3 were subjected to infrared tests, and the test results are shown in fig. 2. As can be seen from FIG. 2, the unmodified carboxyl carbon nanotube has a wavenumber of 1710cm-1Absorption peaks appear on the left and right, which are characteristic absorption peaks of carboxyl groups. The wave number of the modified carbon nano tube is 1645 cm-The characteristic absorption peak of the amide I band caused by N-H bending vibration and C-N stretching vibration appears, and the wave number is 914 cm-1A bending vibration peak (amide III band) of secondary amine N-H appears, which indicates that the amidation of the carboxyl carbon nano tube is realized by the glycine modification reaction, and proves that the glycine modification experiment is successful and feasible.
Centrifugal suspension tests were performed on the glycine-modified carbon nanotubes of example 1 and the original carbon nanotubes of comparative example 2, respectively, with a centrifugal speed of 10000 r/min and a centrifugal time of 10min, and different types of carbon nanotube suspensions are shown in fig. 3. In the figure, the number 1 is the original carbon nanotube, and it can be known from the figure that the unmodified carbon nanotube is seriously layered after the centrifugal experiment, and the bottom of the material is accumulated. The No. 2 glycine modified carbon nano tube still keeps good dispersion effect after centrifugation and is uniformly suspended in the solution (the whole color is uniform). Therefore, the dispersion effect of the modified carbon nano tube is obviously improved.
Comparative example 1
1. The well cementation cement slurry consists of the following raw materials in parts by weight: 100 parts of G-grade oil well cement, 3 parts of fluid loss additive, 0.06 part of dispersant, 0.05 part of defoamer and 44 parts of clear water,
wherein the fluid loss agent is a polymer fluid loss agent;
the dispersing agent is gum arabic;
2. the preparation method of the well cementation cement slurry comprises the following steps:
(1) mixing oil well cement and a fluid loss agent to obtain a solid mixture;
(2) mixing clear water and a defoaming agent to obtain a mixed solution;
(3) and (3) adding the solid mixture obtained in the step (1) into the mixed solution obtained in the step (2) within 10s under the stirring condition of the rotation speed of 3500r/min, and then continuously stirring for 50s at the rotation speed of 12000 r/min.
Comparative example 2
1. The well cementation cement slurry consists of the following raw materials in parts by weight: 100 parts of G-grade oil well cement, 3 parts of fluid loss additive, 0.06 part of dispersant, 0.05 part of carbon nano tube, 0.05 part of defoamer and 44 parts of clear water,
wherein the fluid loss agent is a polymer fluid loss agent;
the dispersing agent is gum arabic;
2. the preparation method of the well cementation cement slurry comprises the following steps:
(1) mixing oil well cement and a fluid loss agent to obtain a solid mixture;
(2) mixing clear water and a defoaming agent to obtain a mixed solution;
(3) and (3) adding the solid mixture obtained in the step (1) into the mixed solution obtained in the step (2) within 10s under the stirring condition of the rotation speed of 3500r/min, and then continuously stirring for 50s at the rotation speed of 12000 r/min.
Comparative example 3
1. The well cementation cement slurry consists of the following raw materials in parts by weight: 100 parts of G-grade oil well cement, 3 parts of fluid loss additive, 0.06 part of dispersant, 0.05 part of carboxyl carbon nano tube, 0.05 part of defoamer and 44 parts of clear water,
wherein the fluid loss agent is a polymer fluid loss agent;
the dispersing agent is gum arabic;
2. the preparation method of the well cementation cement slurry comprises the following steps:
(1) mixing oil well cement and a fluid loss agent to obtain a solid mixture;
(2) mixing clear water and a defoaming agent to obtain a mixed solution;
(3) adding the solid mixture obtained in the step (1) into the mixed solution obtained in the step (2) within 10s under the stirring condition that the rotation speed of the mixed solution is 3500r/min, and then continuously stirring the mixed solution for 50s at the rotation speed of 12000 r/min to obtain the product
The test results of the performances of the well cementation cement slurries of the examples 1 to 3 and the comparative examples 1 to 3 are shown in Table 1.
TABLE 1 results of conventional Performance test
As can be seen from Table 1, compared with the cement slurries of comparative examples 1 to 3, the glycine-modified carbon nanotube well cementation cement slurry provided by the invention has similar water loss performance, lower water precipitation and better sedimentation stability, and is more favorable for improving the well cementation quality.
TABLE 2 mechanical Property test results
Remarking: the curing conditions of the cement stones in the table are normal temperature multiplied by 3 d.
As shown in table 2, in example 3 in which glycine-modified carbon nanotubes were added, the compressive strength, tensile strength, flexural strength and impact resistance were significantly increased as compared with comparative example 2 in which the original carbon nanotubes were added and comparative example 3 in which carboxyl carbon nanotubes were added, and the carboxyl modification also improved the performance within a certain range, but on one hand, the dispersion thereof required the assistance of a dispersant (compatibility study with a well-cementing admixture was required, and the application range was reduced), and on the other hand, the improvement effect of tensile strength was limited. The result shows that the carbon nano tube is modified by glycine, the dispersion effect is improved, the carbon nano tube can be uniformly dispersed in cement paste and tightly connected with the cement paste, and the macroscopic expression of the carbon nano tube is that the strength is improved, and the toughness (tensile, bending and impact resistance) is enhanced. The mechanical test results of the embodiments 1 to 3 show that the larger the addition amount of the glycine modified carbon nanotube is, the larger the increase ratio of the strength and the toughness is; compared with the comparative example 1, the maximum compression strength, tensile strength, flexural strength and impact toughness of the embodiment can be increased by 29.8%, 66.6%, 36.2% and 38.2%, which shows that the modified carbon nano tube is more favorable for the toughness and strength of the well cementation cement slurry.
Claims (9)
1. The glycine modified carbon nanotube is characterized by being prepared by the following method, and comprises the following specific steps in parts by weight:
(1) weighing 1 part of carboxylated carbon nanotube, and sequentially adding 10 parts of dichloromethane, 1.2 parts of oxalyl chloride and 0.1 part of DMF (dimethyl formamide) to obtain a mixed solution A; stirring the mixed solution A at room temperature overnight, removing the solvent by rotary evaporation, recovering a black solid at the bottom layer, washing, carrying out suction filtration, and drying to obtain an acyl chlorinated carbon nanotube;
(2) and (2) taking 1 part of the acylchlorinated carbon nanotube prepared in the step (1), sequentially adding 10 parts of dichloromethane, 1.2 parts of glycine and 2 parts of triethylamine, stirring at room temperature to fully mix, then adding 35 parts of saturated sodium bicarbonate solution with the mass fraction of 8% to carry out quenching reaction, removing the solvent by rotary evaporation, filtering and recovering a bottom black solid, washing with deionized water, carrying out suction filtration, drying and weighing to obtain the glycine modified carbon nanotube.
2. The glycine-modified carbon nanotube well cementation cement slurry prepared from the glycine-modified carbon nanotubes as claimed in claim 1 is characterized by comprising the following raw materials in parts by weight: 100 parts of oil well cement, 1-2 parts of fluid loss additive, 0.2-0.4 part of oil well cement dispersant, 0.01-0.1 part of glycine modified carbon nano tube, 0.05-0.2 part of defoaming agent and 44 parts of clear water.
3. The glycine-modified carbon nanotube well cementation cement slurry prepared from the glycine-modified carbon nanotubes as claimed in claim 1 is characterized by comprising the following raw materials in parts by weight: 100 parts of oil well cement, 1.5 parts of fluid loss additive, 0.3 part of oil well cement dispersant, 0.1 part of glycine modified carbon nano tube, 0.1 part of defoaming agent and 44 parts of clear water.
4. The glycine modified carbon nanotube well cementing cement slurry according to claim 2 or 3, wherein the oil well cement is a G-grade oil well cement.
5. The glycine modified carbon nanotube well cementation cement slurry as claimed in claim 2 or 3, wherein the fluid loss additive is a polymer.
6. The glycine modified carbon nanotube well cementing slurry of claim 5, wherein the polymer is polyvinyl alcohol, 2-acrylamido-2-methylpropanesulfonic acid, hydroxyethyl sesbania, hydroxyethyl cellulose or hydroxypropyl cellulose.
7. The glycine modified carbon nanotube well cementation cement slurry of claim 2 or 3, wherein the defoamer is silicone based.
8. The glycine-modified carbon nanotube well cementation cement slurry as claimed in claim 7, wherein the silicone is polydimethylsiloxane, polyether modified polysiloxane, fluorosilicone, ethylene glycol siloxane or dimethicone.
9. The preparation method of the glycine modified carbon nanotube well cementation cement slurry as claimed in claim 2 or 3, characterized by comprising the following steps:
(1) mixing oil well cement and a fluid loss agent according to a proportion to obtain a solid mixture;
(2) mixing clear water, glycine modified carbon nanotubes and a defoaming agent, and carrying out ultrasonic treatment for 25-30min under the power of 400W to obtain a mixed solution B;
(3) and (3) adding the solid mixture obtained in the step (1) into the mixed solution B obtained in the step (2) under the stirring condition of the rotating speed of 3500r/min, and then continuously stirring the mixed solution B for 50-60 s at the rotating speed of 12000 r/min to obtain the amino acid modified carbon nanotube well cementation cement slurry.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113402186A (en) * | 2021-05-18 | 2021-09-17 | 中国石油天然气股份有限公司 | Preparation method of cement slurry toughening agent, cement slurry and preparation method thereof |
| CN118460197A (en) * | 2024-07-09 | 2024-08-09 | 江苏海洋大学 | Preparation method and application of nanoparticle coated amino acid multiwall carbon nanotube for improving clean fracturing fluid filtration performance |
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