CN115974454A - Middle-deep heat exchange hole well cementation material and preparation method thereof - Google Patents
Middle-deep heat exchange hole well cementation material and preparation method thereof Download PDFInfo
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- CN115974454A CN115974454A CN202211560946.4A CN202211560946A CN115974454A CN 115974454 A CN115974454 A CN 115974454A CN 202211560946 A CN202211560946 A CN 202211560946A CN 115974454 A CN115974454 A CN 115974454A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a well cementation material of a middle-deep heat exchange hole, which comprises the following components in percentage by mass: 70-80% of fine sand, 15-25% of graphite powder, 4% of acrylate and 1% of polyacrylamide; the preparation method comprises the following steps: step 1: uniformly mixing graphite powder, fine sand and acrylic ester according to a certain mass ratio to obtain a mixture; step 2: and then adding polyacrylamide into the mixture obtained in the step 1 to obtain the well cementing material. The invention can greatly improve the heat conductivity of the heat exchange hole annulus by adopting the novel well cementation material, the heat conductivity of the traditional cement sheath is 0.7-1 w/(m.k), the heat conductivity of the novel well cementation material can reach more than 2.5 w/(m.k), the heat exchange capacity of a single well is greatly improved, and the invention has extremely high economic benefit.
Description
Technical Field
The invention relates to the technical field of geothermal heating, in particular to a middle-deep layer heat exchange hole well cementation material and a preparation method thereof.
Background
Geothermal energy is renewable heat energy from the inside of the earth, which originates from the decay of magma and radioactive substances in the earth, and the heat is continuously transferred from a lower high-temperature rock layer to an upper low-temperature rock layer through the heat conduction of the stratum, and the reserves are huge and renewable. Currently, geothermal energy can be divided into hydrothermal geothermal energy (water source) and dry hot rock (ground source) in terms of utilization form.
The hydrothermal geothermal (water source) uses water as medium, utilizes the heat of high-temp underground water, and then the tail water of geothermal water is back-poured into the ground, and because of said utilization form, the flow rate of underground water is quick, so that the heat-taking influence radius of single well is very large, and its heat-collecting power is also very large.
However, for the buried pipe in the middle-deep layer, due to the fact that underground water is not used, heat can be extracted only by being conducted to the annular cement sheath of the casing pipe through high-temperature rocks and then conducted to the casing pipe and further conducted to heat exchange fluid in the shaft, and therefore heat recovery efficiency is low.
Disclosure of Invention
1. Technical problem to be solved
The invention aims to solve the problem that heat extraction can only be conducted to a casing annular cement sheath through high-temperature rocks and then to a casing and then to heat exchange fluid in a shaft because underground water is not used for the middle-deep buried pipe in the prior art, and provides a middle-deep heat exchange hole well cementation material and a preparation method thereof.
2. Technical scheme
In order to achieve the purpose, the invention adopts the following technical scheme:
a well cementation material for a middle-deep heat exchange hole comprises the following components in percentage by mass: 70-80% of fine sand, 15-25% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
Preferably, the cementing material comprises the following components in percentage by mass: 80% of fine sand, 15% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
Preferably, the cementing material comprises the following components in percentage by mass: 70% of fine sand, 25% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
Preferably, the cementing material comprises the following components in percentage by mass: 75% of fine sand, 20% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
The invention also provides a preparation method of the medium-deep heat exchange hole well cementing material, which comprises the following steps:
step 1: uniformly mixing graphite powder, fine sand and acrylic ester according to a certain mass ratio to obtain a mixture;
and 2, step: and then adding polyacrylamide into the mixture obtained in the step 1 to obtain the well cementing material.
Preferably, the fine sand has a density of 1.9 to 2.3g/cm 3 The specification is 100 meshes.
The invention also provides medium-deep heat exchange hole cementing which comprises a surface casing and an artificial well bottom, wherein the surface casing is covered with surface cement for cementing, and the surface casing is filled with the cementing material.
The invention also provides a construction method for cementing the middle-deep heat exchange hole, which comprises the following steps:
s1: after the well cementation material is uniformly mixed on the ground surface, injecting the well cementation material from the outside of the surface casing, simultaneously adopting an air compressor to wash out drilling fluid in the surface casing, and ensuring that the well cementation material is smoothly put into the bottom of the hole by a reverse circulation process of external injection and internal suction;
s2: and after the well cementation is finished, a drill rod is put into the surface casing pipe, and cement slurry is injected to form an artificial well bottom.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
according to the invention, by adopting the novel well cementing material, the heat conductivity of the heat exchange hole annulus can be greatly improved, the heat conductivity of the traditional cement sheath is 0.7-1 w/(m.k), the heat conductivity of the novel well cementing material can reach more than 2.5 w/(m.k), the heat exchange capacity of a single well is greatly improved, and the novel well cementing material has extremely high economic benefits.
Drawings
FIG. 1 is a schematic structural view of the medium-deep heat exchange hole cementing provided by the invention.
In the figure: 1 surface casing, 2 artificial well bottom, and 3 surface cement well cementation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1:
a well cementation material for a middle-deep heat exchange hole comprises the following components in percentage by mass: 70-80% of fine sand, 15-25% of graphite powder, 4% of acrylic ester and 1% of polyacrylamide.
The preparation method of the medium-deep heat exchange hole cementing material comprises the following steps:
step 1: evenly mixing graphite powder, fine sand and acrylic ester according to a certain mass ratio to obtain a mixture, wherein the density of the fine sand is 1.9-2.3g/cm 3 The specification is 100 meshes;
step 2: and adding polyacrylamide into the mixture obtained in the step 1 to obtain the well cementing material.
According to the invention, by adopting the novel well cementing material, the heat conductivity of the heat exchange hole annulus can be greatly improved, the heat conductivity of the traditional cement sheath is 0.7-1 w/(m.k), the heat conductivity of the novel well cementing material can reach more than 2.5 w/(m.k), the heat exchange capacity of a single well is greatly improved, and the novel well cementing material has extremely high economic benefits.
Example 2:
the implementation contents of the above embodiments can be referred to the above description, and the embodiments herein are not repeated in detail; in the embodiment of the present application, the difference from the above embodiment is:
a well cementation material for a middle-deep heat exchange hole comprises the following components in percentage by mass: 80% of fine sand, 15% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
Example 3:
the implementation contents of the above embodiments can be referred to the above description, and the embodiments herein are not repeated in detail; in the embodiment of the present application, the difference from the above embodiment is:
a well cementation material for a middle-deep heat exchange hole comprises the following components in percentage by mass: 70% of fine sand, 25% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
Example 4:
the implementation contents of the above embodiments can be referred to the above description, and the embodiments herein are not repeated in detail; in the embodiment of the present application, the difference from the above embodiment is:
a well cementation material for a middle and deep heat exchange hole comprises the following components in percentage by mass: 75% of fine sand, 20% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
Example 5:
the implementation contents of the above embodiments can be referred to the above description, and the embodiments herein are not repeated in detail; in the embodiment of the present application, the difference from the above embodiment is:
referring to fig. 1, the well cementation of the middle-deep heat exchange hole comprises a surface casing and an artificial well bottom, wherein the surface casing is covered with surface cement for well cementation, and the surface casing is filled with well cementation materials.
The construction method for cementing the heat exchange hole in the middle-deep layer comprises the following steps:
s1: after the well cementation material is uniformly mixed on the ground surface, injecting the well cementation material from the outside of the surface casing, simultaneously adopting an air compressor to wash out drilling fluid in the surface casing, and ensuring that the well cementation material is smoothly put into the bottom of the hole by a reverse circulation process of external injection and internal suction;
s2: and after the well cementation is finished, a drill rod is put into the surface casing pipe, and cement slurry is injected to form an artificial well bottom.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The well cementation material for the medium-deep heat exchange hole is characterized by comprising the following components in percentage by mass: 70-80% of fine sand, 15-25% of graphite powder, 4% of acrylic ester and 1% of polyacrylamide.
2. The medium-deep heat exchange hole cementing material as claimed in claim 1, wherein the cementing material comprises the following components in percentage by mass: 80% of fine sand, 15% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
3. The medium-deep heat exchange hole cementing material as claimed in claim 1, which comprises the following components in percentage by mass: 70% of fine sand, 25% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
4. The medium-deep heat exchange hole cementing material as claimed in claim 1, wherein the cementing material comprises the following components in percentage by mass: 75% of fine sand, 20% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
5. The method for preparing a medium-deep heat-exchange well cementing material according to any one of claims 1 to 4, characterized by comprising the following steps:
step 1: uniformly mixing graphite powder, fine sand and acrylic ester in a certain mass ratio to obtain a mixture;
step 2: and then adding polyacrylamide into the mixture obtained in the step 1 to obtain the well cementing material.
6. The medium-deep heat-exchange well cementing material of claim 5The preparation method is characterized in that the density of the fine sand is 1.9-2.3g/cm 3 The specification is 100 meshes.
7. Well cementation in a medium and deep heat exchange hole applying the cementing material according to any of claims 1 to 4, characterized by comprising a surface casing (1) and a man-made well bottom (2), the outside of the surface casing (1) being covered with a surface cement cementing well (3), the inside of the surface casing (1) being filled with the cementing material.
8. The construction method for cementing a medium-deep heat exchange hole according to claim 7, characterized by comprising the following steps:
s1: after being uniformly mixed on the ground surface, the well cementing material is injected from the outside of the surface casing pipe (1), and meanwhile, the inside of the surface casing pipe (1) adopts an air compressor to wash out the drilling fluid, and the reverse circulation process of the outside injection and the inside absorption ensures that the well cementing material is smoothly put into the hole bottom;
s2: after the well cementation is finished, a drill rod is put into the surface casing (1) and cement slurry is injected to form an artificial well bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211560946.4A CN115974454A (en) | 2022-12-07 | 2022-12-07 | Middle-deep heat exchange hole well cementation material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211560946.4A CN115974454A (en) | 2022-12-07 | 2022-12-07 | Middle-deep heat exchange hole well cementation material and preparation method thereof |
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| CN115974454A true CN115974454A (en) | 2023-04-18 |
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| CN202211560946.4A Pending CN115974454A (en) | 2022-12-07 | 2022-12-07 | Middle-deep heat exchange hole well cementation material and preparation method thereof |
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| CN (1) | CN115974454A (en) |
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- 2022-12-07 CN CN202211560946.4A patent/CN115974454A/en active Pending
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