CN111499300B - Energy-saving heat-conducting composite material and preparation method and application thereof - Google Patents
Energy-saving heat-conducting composite material and preparation method and application 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
- C04B28/04—Portland cements
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00439—Physico-chemical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00465—Heat conducting materials
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
Abstract
The invention discloses an energy-saving heat-conducting composite material and a preparation method and application thereof, wherein the composite material comprises the following raw materials in parts by weight: 336-600 parts of cement, 0-24 parts of graphite, 0-180 parts of silicon carbide, 0-60 parts of iron powder, 0-4.8 parts of naphthalene water reducer and 355-360 parts of water. The method comprises the following steps: stirring cement, silicon carbide and iron powder in a uniform magnetic field environment with the direction of magnetic lines of force opposite to the direction of gravity to obtain a first mixture; adding a naphthalene water reducer into the first mixture, and uniformly mixing to obtain a powdery mixture; slowly adding the mixture into water, and stirring until the mixture is uniformly mixed; and pouring cement paste for molding, and curing in a standard curing box to obtain the energy-saving heat-conducting composite material. The application is the application of the energy-saving heat-conducting composite material in enhancing the well cementation heat-conducting property of the middle-deep geothermal well. The invention can avoid the layering phenomenon of metal particles and other materials due to different densities, and is beneficial to the uniform mixing of cement powder and heat-conducting particles.
Description
Technical Field
The invention relates to the field of composite materials, in particular to an energy-saving heat-conducting composite material and a preparation method and application thereof.
Background
The development and utilization of geothermal resources in China have wide application prospects and huge market potential, but how to realize the efficient and continuous utilization of geothermal energy becomes a main problem facing currently. The geothermal well is used as the most important engineering step in developing geothermal resources, and is mined from the ground several kilometers downwards, and the heat energy is extracted and transmitted to the ground for various geothermal utilization. The formation of the geothermal well has a very complex process flow, the engineering project generally has long time and high investment, but the engineering at this stage is related to the success or failure of the development and utilization of geothermal energy, so the quality of the formation of the geothermal well has a crucial meaning for the development and efficient utilization of geothermal energy.
The heat exchanger of the geothermal well is buried underground, and heat transfer between underground rock and a system is realized by circulating medium (generally water) flowing in a closed underground buried pipe. The buried pipe heat exchanger realizes the primary extraction of geothermal resources. The well cementation is an important link in the construction process of the ground heat exchanger, and the used well cementation material is arranged between a buried pipe and a borehole wall of the ground heat exchanger, is used for enhancing the heat exchange between the buried pipe and the surrounding rock soil and simultaneously preventing the cross contamination between water storage layers of underground water. The selection of well cementation materials and normal construction have important significance for ensuring the efficiency of the buried pipe heat exchanger, and the adoption of the well cementation materials with poor heat conduction performance can obviously increase the thermal resistance in the heat exchange process, so that the underground heat exchange efficiency of the geothermal well is low, and therefore, the selection of the proper well cementation materials plays an important role in the heat extraction performance of the whole geothermal well.
Therefore, under the background, the development of the cement-based composite material for cementing and strengthening heat exchange of the geothermal well, which has higher heat conductivity coefficient and does not influence construction, is imperative.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention aims to provide an energy-saving heat-conducting composite material for improving the heat conductivity coefficient and the heat exchange efficiency, and the invention also aims to provide a preparation method of the energy-saving heat-conducting composite material with uniformly mixed materials.
The technical scheme is as follows: the invention relates to an energy-saving heat-conducting composite material which comprises the following raw materials in parts by weight: 336-600 parts of cement, 0-24 parts of graphite, 0-180 parts of silicon carbide, 0-60 parts of iron powder, 0-4.8 parts of naphthalene water reducer and 355-360 parts of water.
Preferably, the cement-based composite material comprises the following raw materials in parts by weight: 425# common silicate or 525# common silicate or 336 to 600 parts of oil well cement, 0 to 24 parts of graphite, 0 to 180 parts of silicon carbide, 0 to 60 parts of iron powder, 0 to 4.8 parts of naphthalene water reducer and 360 parts of water.
Preferably, the cement-based composite material comprises the following raw materials in parts by weight: 570 parts of ordinary silicate 425# cement, 0 part of graphite, 15 parts of silicon carbide, 15 parts of iron powder, 4.8 parts of naphthalene water reducer and 360 parts of water.
Wherein, the cement is any one of ordinary silicate 425#, ordinary silicate 525# and oil well cement. The average granularity of the silicon carbide is larger than 3000 meshes, the mass purity is larger than 98 percent, and the moisture content is less than or equal to 0.5 percent. The average particle size of the iron powder is larger than 1000 meshes, the mass purity is larger than 99 percent, and the moisture content is less than or equal to 0.5 percent. The silicon carbide and the iron powder are spherical. The average particle size of graphite is larger than 3000 meshes, and the mass purity is larger than 99%; the water content is less than or equal to 0.5 percent. The naphthalene water reducing agent is FDN powder naphthalene sodium sulfonate.
The preparation method of the energy-saving heat-conducting composite material comprises the following steps:
step one, stirring cement, silicon carbide and iron powder in a uniform magnetic field environment with the direction of magnetic lines of force opposite to the direction of gravity according to a stoichiometric ratio until the cement, the silicon carbide and the iron powder are uniformly mixed to obtain a first mixture;
step two, adding a powdery naphthalene water reducer with a formula amount prepared in advance into the uniformly mixed mixture I obtained in the step one, and uniformly mixing again to obtain a powdery mixture;
step three, slowly adding the uniformly mixed powdery mixture of the cement-based composite material obtained in the step two into water, and stirring the mixture by using a cement paste mixer until the mixture is uniformly mixed to obtain cement paste of the cement-based composite material for well cementation and heat exchange enhancement of the middle-deep geothermal well;
and step four, pouring and molding the cement paste obtained in the step three, and curing in a standard curing box to obtain the energy-saving heat-conducting composite material.
The energy-saving heat-conducting composite material is applied to enhancing the well cementation heat-conducting property of the middle-deep geothermal well.
The formula is designed aiming at the problem of low heat conductivity coefficient of the conventional well cementation cement, and the design concept is as follows:
firstly, testing the development rules of the density and the fluidity of ordinary Portland 425# cement, ordinary Portland 525# cement and oil well cement through experiments, and adjusting the mass proportion of each component and the grain size of the filler according to the experimental results when the ordinary Portland 425# cement, the ordinary Portland 525# cement and the oil well cement have different mass specific gravities or different grain sizes, so that the cement-based composite material cement slurry for well cementation and strengthening heat exchange of the middle-deep geothermal well and the composition of each component are obtained when the density and the fluidity of a system are not influenced or are slightly influenced.
And then after the cement slurry is poured and molded, testing and analyzing the influence of fillers with different particle sizes or proportions on the thermal conductivity of the cement-based composite material for reinforcing and heat exchanging of the middle and deep geothermal well cementing, preferably selecting a formula for improving the thermal conductivity coefficient, and simultaneously, the formula has smaller influence on the density and the fluidity of the cement slurry for reinforcing and heat exchanging of the middle and deep geothermal well cementing, so that the formula of the cement-based composite material for reinforcing and heat exchanging of the middle and deep geothermal well cementing is finally formed.
Graphite is a carbon element crystalline mineral, has stable chemical properties, can resist acid, alkali and organic solvent corrosion, and has thermal conductivity superior to that of metal materials such as steel, iron, lead and the like. The embodiment selects the graphite with good heat conduction performance, reduces the heat transfer resistance of the well cementation material, and improves the underground heat exchange efficiency of the geothermal well.
Silicon carbide has high chemical stability, high hardness, high heat conductivity and low thermal expansion coefficient. The ceramic material is widely applied to the fields of electronics, information, precision machining technology, war industry, aerospace, high-grade refractory materials, special ceramic materials, high-grade grinding materials, reinforcing materials and the like.
Iron is an indispensable metal material for the national economy, particularly for the mechanical manufacturing industry. As a metal material, the alloy has good ductility, electric conductivity and heat conductivity.
The water reducing agent is a cement admixture capable of reducing the mixing water consumption under the condition of maintaining the fluidity of cement paste unchanged, and most of the water reducing agent belongs to an anionic surfactant. After the mixture is added, the cement particle dispersing agent has a dispersing effect on cement particles, can improve the workability, reduce the unit water consumption and improve the fluidity of the mixture. The water reducing agent selected by the invention is a naphthalene water reducing agent.
Has the advantages that: compared with the prior art, the invention has the following remarkable characteristics:
1. the conventional well cementing material of the middle-deep geothermal well is only cement paste and is not doped with other materials, so that the obtained paste material has low heat conductivity coefficient, while the well cementing composite material of the middle-deep geothermal well contains metal and inorganic material heat conducting particles, and the heat conducting particles have higher heat conductivity coefficient and can obviously improve the heat conductivity of the composite material;
2. the water reducing agent is not added in the preparation process of the conventional middle-deep geothermal well cementing material, but the water reducing agent is added in the preparation process of the middle-deep geothermal well cementing composite material, so that the using amount of water can be reduced, the number of vacuoles formed after evaporation of redundant water is reduced, the influence of air thermal resistance is reduced, and the thermal conductivity of the composite material is improved;
3. the metal iron powder and the inorganic heat-conducting particle silicon carbide added in the composite material for well cementation of the middle-deep geothermal well have spherical appearance characteristics, and can play a certain role in lubrication, so that the flowability of the composite material is improved;
4. different from the conventional preparation method of the well cementation material of the middle-deep geothermal well, the preparation method of the well cementation composite material of the middle-deep geothermal well firstly mixes the solid materials uniformly and then sequentially adds the water reducing agent and the water, so that the operation is beneficial to the uniform mixing of the cement powder and other heat conduction particles, and the problem of uneven heat conduction coefficient caused by uneven mixing of the materials is avoided;
5. in the preparation method of the well cementation composite material of the middle-deep geothermal well, the solid materials are mixed in a uniform magnetic field environment with the direction of magnetic force lines opposite to the direction of gravity, and the design can avoid the layering phenomenon of metal particles and other materials due to different densities, and is beneficial to the uniform mixing of cement powder and heat conduction particles.
Detailed Description
The raw materials in the following examples were all purchased and used. The average granularity of the silicon carbide is larger than 3000 meshes, the mass purity is larger than 98 percent, and the moisture content is less than or equal to 0.5 percent; the average particle size of the iron powder is larger than 1000 meshes, the mass purity is larger than 99 percent, and the moisture content is less than or equal to 0.5 percent; the average particle size of graphite is larger than 3000 meshes, and the mass purity is larger than 99%; the water content is less than or equal to 0.5 percent. The silicon carbide and the iron powder are spherical.
Example 1
The cement-based composite material for reinforcing heat exchange of well cementation of the middle-deep geothermal well is prepared from the following raw materials in percentage by weight: 570 parts of ordinary silicate 425# cement, 0 part of graphite, 15 parts of silicon carbide, 15 parts of iron powder, 0 part of naphthalene water reducer and 355 parts of water, which are all in mass ratio.
The preparation method of the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well comprises the following steps:
the method comprises the following steps: 570 parts of ordinary portland 425# cement, 15 parts of silicon carbide and 15 parts of iron powder are stirred in a uniform magnetic field environment with the direction of magnetic lines of force opposite to the direction of gravity until the materials are uniformly mixed to obtain a first mixture;
step two: slowly adding the powdery mixture of the cement-based composite material uniformly mixed in the step one into 360 parts of water, and stirring the mixture by using a cement paste mixer until the mixture is uniformly mixed to obtain cement paste of the cement-based composite material for cementing and strengthening heat exchange of the middle-deep geothermal well;
step three: and pouring and molding the cement paste obtained in the step two, and curing in a standard curing box for 28 days to obtain the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well.
Example 2
The cement-based composite material for reinforcing heat exchange of well cementation of the middle-deep geothermal well is prepared from the following raw materials in percentage by weight: 570 parts of ordinary silicate 425# cement, 0 part of graphite, 15 parts of silicon carbide, 15 parts of iron powder, 4.8 parts of naphthalene water reducer and 360 parts of water, which are all in mass ratio.
The preparation method of the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well comprises the following steps:
the method comprises the following steps: 570 parts of ordinary portland 425# cement, 15 parts of silicon carbide and 15 parts of iron powder are stirred in a uniform magnetic field environment with the direction of magnetic lines of force opposite to the direction of gravity until the materials are uniformly mixed to obtain a first mixture;
step two: adding 4.8 parts of powdery naphthalene water reducing agent prepared in advance into the uniformly mixed mixture I in the step I, and uniformly mixing again;
step three: slowly adding the powdery mixture of the cement-based composite material uniformly mixed in the step two into 360 parts of water, and stirring the mixture by using a cement paste stirrer until the mixture is uniformly mixed to obtain the cement-based composite material cement slurry for well cementation and heat exchange enhancement of the middle-deep geothermal well;
step four: and pouring and molding the cement paste obtained in the third step, and curing in a standard curing box for 28 days to obtain the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well.
Example 3
The cement-based composite material for well cementation and heat exchange enhancement of the medium-deep geothermal well is prepared from the following raw materials in percentage by weight: 570 parts of ordinary portland cement 525#, 0 part of graphite, 15 parts of silicon carbide, 15 parts of iron powder, 4.8 parts of a naphthalene water reducer and 360 parts of water, wherein the above parts are in mass ratio.
The preparation method of the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well comprises the following steps:
the method comprises the following steps: 570 parts of required ordinary portland 525# cement, 15 parts of silicon carbide and 15 parts of iron powder are stirred in a uniform magnetic field environment with the direction of magnetic lines of force opposite to the direction of gravity until the materials are uniformly mixed to obtain a first mixture;
step two: adding 4.8 parts of powdery naphthalene water reducing agent prepared in advance into the uniformly mixed mixture I in the step I, and uniformly mixing again;
step three: slowly adding the powdery mixture of the cement-based composite material uniformly mixed in the step two into 360 parts of water, and stirring the mixture by using a cement paste mixer until the mixture is uniformly mixed to obtain the cement paste of the cement-based composite material for cementing and strengthening heat exchange of the middle-deep geothermal well;
step four: and pouring and molding the cement paste obtained in the third step, and curing in a standard curing box for 28 days to obtain the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well.
Example 4
The cement-based composite material for reinforcing heat exchange of well cementation of the middle-deep geothermal well is prepared from the following raw materials in percentage by weight: 570 parts of oil well cement, 0 part of graphite, 15 parts of silicon carbide, 15 parts of iron powder, 4.8 parts of naphthalene water reducer and 360 parts of water, wherein the above parts are all in mass ratio.
The preparation method of the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well comprises the following steps:
the method comprises the following steps: 570 parts of required oil well cement, 15 parts of silicon carbide and 15 parts of iron powder are stirred in a uniform magnetic field environment with the direction of magnetic lines opposite to the direction of gravity until the materials are uniformly mixed to obtain a first mixture;
step two: adding 4.8 parts of powdery naphthalene water reducing agent prepared in advance into the uniformly mixed mixture I in the step I, and uniformly mixing again;
step three: slowly adding the powdery mixture of the cement-based composite material uniformly mixed in the step two into 360 parts of water, and stirring the mixture by using a cement paste mixer until the mixture is uniformly mixed to obtain the cement paste of the cement-based composite material for cementing and strengthening heat exchange of the middle-deep geothermal well;
step four: and pouring and molding the cement paste obtained in the third step, and curing in a standard curing box for 28 days to obtain the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well.
Example 5
The cement-based composite material for reinforcing heat exchange of well cementation of the middle-deep geothermal well is prepared from the following raw materials in percentage by weight: 564 parts of ordinary portland 425# cement, 6 parts of graphite, 15 parts of silicon carbide, 15 parts of iron powder, 4.8 parts of naphthalene water reducer and 360 parts of water, wherein the above components are in mass ratio.
The preparation method of the cement-based composite material for well cementation and heat exchange enhancement of the middle-deep geothermal well comprises the following steps:
the method comprises the following steps: 564 parts of required ordinary portland 425# cement, 6 parts of graphite, 15 parts of silicon carbide and 15 parts of iron powder are stirred and uniformly mixed in a uniform magnetic field environment with the direction of magnetic lines of force opposite to the direction of gravity to obtain a first mixture;
step two: adding 4.8 parts of powdery naphthalene water reducing agent prepared in advance into the uniformly mixed mixture I in the step I, and uniformly mixing again;
step three: slowly adding the powdery mixture of the cement-based composite material uniformly mixed in the step two into 360 parts of water, and stirring the mixture by using a cement paste mixer until the mixture is uniformly mixed to obtain the cement paste of the cement-based composite material for cementing and strengthening heat exchange of the middle-deep geothermal well;
step four: and pouring and molding the cement paste obtained in the third step, and curing in a standard curing box for 28 days to obtain the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well.
Example 6
The cement-based composite material for reinforcing heat exchange of well cementation of the middle-deep geothermal well is prepared from the following raw materials in percentage by weight: 558 parts of ordinary silicate 425# cement, 12 parts of graphite, 15 parts of silicon carbide, 15 parts of iron powder, 4.8 parts of naphthalene water reducer and 360 parts of water, which are in mass ratio.
The preparation method of the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well comprises the following steps:
the method comprises the following steps: mixing required ordinary silicate 425# cement 558 parts, graphite 12 parts, silicon carbide 15 parts and iron powder 15 parts in a uniform magnetic field environment with magnetic force lines opposite to the gravity direction until the materials are uniformly mixed to obtain a first mixture;
step two: adding 4.8 parts of powdery naphthalene water reducing agent prepared in advance into the uniformly mixed mixture I in the step I, and uniformly mixing again;
step three: slowly adding the powdery mixture of the cement-based composite material uniformly mixed in the step two into 360 parts of water, and stirring the mixture by using a cement paste mixer until the mixture is uniformly mixed to obtain the cement paste of the cement-based composite material for cementing and strengthening heat exchange of the middle-deep geothermal well;
step four: and pouring and molding the cement paste obtained in the third step, and curing in a standard curing box for 28 days to obtain the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well.
Example 7
The cement-based composite material for reinforcing heat exchange of well cementation of the middle-deep geothermal well is prepared from the following raw materials in percentage by weight: 552 parts of ordinary silicate 425# cement, 18 parts of graphite, 15 parts of silicon carbide, 15 parts of iron powder, 4.8 parts of naphthalene water reducer and 360 parts of water, which are in mass ratio.
The preparation method of the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well comprises the following steps:
the method comprises the following steps: 552 parts of ordinary portland 425# cement, 18 parts of graphite, 15 parts of silicon carbide and 15 parts of iron powder are stirred and uniformly mixed in a uniform magnetic field environment with the direction of magnetic lines of force opposite to the direction of gravity to obtain a first mixture;
step two: adding 4.8 parts of powdery naphthalene water reducing agent prepared in advance into the uniformly mixed mixture I in the step I, and uniformly mixing again;
step three: slowly adding the powdery mixture of the cement-based composite material uniformly mixed in the step two into 360 parts of water, and stirring the mixture by using a cement paste mixer until the mixture is uniformly mixed to obtain the cement paste of the cement-based composite material for cementing and strengthening heat exchange of the middle-deep geothermal well;
step four: and pouring and molding the cement paste obtained in the third step, and curing in a standard curing box for 28 days to obtain the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well.
The invention adopts a mode of adding heat-conducting particles in the traditional cement base material to prepare the reinforced heat-exchange type well cementing material. The cement substrate selected is common Portland 425, 525 or oil well cement, although there will be different preferred embodiments for different types of cement; the water reducing agent is powdery, so the water reducing agent is uniformly mixed with a powdery base material and then added into water for stirring, and if the liquid water reducing agent is selected, the liquid water reducing agent can be added together with the water.
Performance test
TABLE 1 detection results of the performance of the cementing enhanced heat exchange type cement-based material for the middle and deep geothermal well
| Item | Pulp cleaner | Example 5 | Comparative example |
| Fluidity (mm) | 210 | 208 | 190 |
| Mud weight (t/m)3) | 1.710 | 1.735 | 1.652 |
| Thermal conductivity (W/(m.K)) | 1.038 | 1.130 | 0.82 |
Designing a comparative cement-based material, which comprises the following substances in parts by weight: 564 parts of ordinary silicate 425# cement, 6 parts of graphite, 4.8 parts of a naphthalene water reducer and 360 parts of water, which are all in mass ratio.
The fluidity of the cement-based composite cement slurry for cementing and strengthening heat exchange of the middle-deep geothermal well in the comparative example and the example 5 is tested by the cement slurry fluidity method of GB/T8077-2000 concrete admixture homogeneity test method, and part of the test results are shown in Table 1. The density of the middle-deep geothermal well cementing and strengthening heat exchange cement slurry in the comparative example and the example 5 is measured by a cement slurry hydrometer, and water is used for checking before the experiment. The results of the experiment are shown in table 1.
The thermal conductivity of the cement-based composite material for reinforcing and heat exchanging of well cementation of a middle and deep geothermal well in the comparative example and the example 5 is measured by a DRE-III multifunctional rapid thermal conductivity tester, and the thermal conductivity tester adopts a Transient Plane heat Source Technology (TPS): according to unsteady state heat transfer theory, if a constant heat source exists in a solid medium, the temperature of the constant heat source and the temperature of the surrounding medium rise under the action of the heat source, and the speed of the temperature rise of the heat source depends on the heat conductivity coefficient of the surrounding medium. Therefore, the heat conductivity coefficient of the medium can be correspondingly calculated by measuring the temperature rise rate of the heat source. During testing, the probe is clamped between two same samples, and due to the increase of the temperature after electrification, the resistance of the probe changes, so that the voltages at two ends of the probe change, and heat flow information in the probe and the samples can be obtained by recording the change of the current and the voltage in a period of time, and further the heat conductivity coefficient of the medium is calculated. 3 samples were measured for each set of experiments, and 3 data were measured, and when the error thereof was not more than 10%, the average thereof was taken as an experimental value, and the size of each sample was 70mm × 70mm × 20 mm.
As can be seen from table 1, the cement-based composite material for reinforcing heat exchange of well cementation of the middle-deep geothermal well in example 5 has high thermal conductivity and has small influence on the density and the fluidity of cement slurry. The cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well is particularly suitable for well cementation materials of the middle-deep geothermal well. With the development of the geothermal energy resource market, the cement-based composite material for reinforcing heat exchange of well cementation of the middle-deep geothermal well has very wide application prospect.
Claims (1)
1. The preparation method of the energy-saving heat-conducting composite material is characterized by comprising the following steps of:
the method comprises the following steps: 564 parts of required ordinary portland 425# cement, 6 parts of graphite, 15 parts of silicon carbide and 15 parts of iron powder are stirred and uniformly mixed in a uniform magnetic field environment with the direction of magnetic lines of force opposite to the direction of gravity to obtain a first mixture;
step two: adding 4.8 parts of powdery naphthalene water reducing agent prepared in advance into the uniformly mixed mixture I in the step I, and uniformly mixing again;
step three: slowly adding the powdery mixture of the cement-based composite material uniformly mixed in the step two into 360 parts of water, and stirring the mixture by using a cement paste mixer until the mixture is uniformly mixed to obtain the cement paste of the cement-based composite material for cementing and strengthening heat exchange of the middle-deep geothermal well;
step four: pouring and molding the cement paste obtained in the third step, and curing in a standard curing box for 28 days to obtain the cement-based composite material for strengthening heat exchange of well cementation of the middle-deep geothermal well;
the average granularity of the silicon carbide is more than 3000 meshes, the mass purity is more than 98 percent, and the moisture content is less than or equal to 0.5 percent; the average particle size of the iron powder is larger than 1000 meshes, the mass purity is larger than 99 percent, and the moisture content is less than or equal to 0.5 percent; the silicon carbide and the iron powder are spherical; the naphthalene water reducer is FDN powder naphthalene sodium sulfonate;
the average particle size of the graphite is more than 3000 meshes, and the mass purity is more than 99%; the water content is less than or equal to 0.5 percent;
the heat conductivity coefficient of the energy-saving heat-conducting composite material is 1.130W/(m.K).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104986993A (en) * | 2015-06-04 | 2015-10-21 | 中国石油化工股份有限公司 | Low-heat-conduction cement mortar used for geothermal well formation and preparation method thereof |
| CN108751870A (en) * | 2018-07-26 | 2018-11-06 | 成都理工大学 | A kind of underground heat exploitation high heat conduction cementing concrete material |
| CN109403916A (en) * | 2018-12-05 | 2019-03-01 | 田振林 | A kind of thermally conductive well shaft fixing technology of geothermal well |
| CN110342838A (en) * | 2019-07-11 | 2019-10-18 | 济南大学 | A kind of preparation method and application of high thermal conductivity clinker and its cement products |
| CN110386780A (en) * | 2019-07-24 | 2019-10-29 | 中国煤炭地质总局水文地质局 | A kind of well cementing material of mid-deep strata geothermal well and preparation method thereof and geothermal well |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104986993A (en) * | 2015-06-04 | 2015-10-21 | 中国石油化工股份有限公司 | Low-heat-conduction cement mortar used for geothermal well formation and preparation method thereof |
| CN108751870A (en) * | 2018-07-26 | 2018-11-06 | 成都理工大学 | A kind of underground heat exploitation high heat conduction cementing concrete material |
| CN109403916A (en) * | 2018-12-05 | 2019-03-01 | 田振林 | A kind of thermally conductive well shaft fixing technology of geothermal well |
| CN110342838A (en) * | 2019-07-11 | 2019-10-18 | 济南大学 | A kind of preparation method and application of high thermal conductivity clinker and its cement products |
| CN110386780A (en) * | 2019-07-24 | 2019-10-29 | 中国煤炭地质总局水文地质局 | A kind of well cementing material of mid-deep strata geothermal well and preparation method thereof and geothermal well |
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