CN117190515A - Geothermal resource utilization system of abandoned well - Google Patents
Geothermal resource utilization system of abandoned well Download PDFInfo
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- CN117190515A CN117190515A CN202311392944.3A CN202311392944A CN117190515A CN 117190515 A CN117190515 A CN 117190515A CN 202311392944 A CN202311392944 A CN 202311392944A CN 117190515 A CN117190515 A CN 117190515A
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- heat exchange
- well
- resource utilization
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- 238000004321 preservation Methods 0.000 claims abstract description 39
- 239000002699 waste material Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000007769 metal material Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 59
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 8
- 239000002352 surface water Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention belongs to the technical field of geothermal resource development and utilization, and particularly relates to a geothermal resource utilization system of a waste well. The system comprises a heat exchange well pipe used for being put into a waste well when in use, wherein the heat exchange well pipe comprises two sections, namely a heat preservation section made of plastic materials and a heat exchange section made of metal materials, and the heat preservation section is positioned at the upper side of the heat exchange section when in use; the heat exchange device is used for exchanging heat between the underground high-temperature stratum and the underground high-temperature stratum, and returning the underground high-temperature stratum to the ground through the heat exchange well pipe. The system realizes the utilization of geothermal resources by recycling the abandoned well, can greatly save the drilling cost, and has important practical significance for realizing double-carbon targets and recycling renewable clean energy sources in China.
Description
Technical Field
The invention belongs to the technical field of geothermal resource development and utilization, and particularly relates to a geothermal resource utilization system of a waste well.
Background
At present, the geothermal well drilling depth in China is mostly 2000-3500 m, the bottom hole temperature can reach 50-100 ℃, each well invests 400-700 ten thousand yuan, and the geothermal well is scrapped because of insufficient water quantity or no water; in addition, many oil fields and salt fields are exhausted, so that many oil wells and salt wells are idle and cannot play a role. At present, the general disposal mode of the abandoned wells is to plug and not utilize the abandoned wells. Along with the increase of the number of abandoned wells, how to effectively utilize the underground heat energy and avoid the waste of resources become an increasingly prominent problem.
Disclosure of Invention
The invention aims to provide a geothermal resource utilization system of abandoned wells, which is used for solving the problems of investment and resource waste caused by the fact that abandoned wells are not utilized in the prior art.
In order to solve the technical problems, the invention provides a geothermal resource utilization system of an abandoned well, which comprises a heat exchange well pipe used for being put into the abandoned well when in use, wherein the heat exchange well pipe comprises two sections, namely a heat preservation section made of plastic materials and a heat exchange section made of metal materials, and the heat preservation section is positioned at the upper side of the heat exchange section when in use; the heat exchange device is used for exchanging heat between the underground high-temperature stratum and the underground high-temperature stratum, and returning the underground high-temperature stratum to the ground through the heat exchange well pipe.
The beneficial effects of the technical scheme are as follows: the invention relates to a geothermal resource utilization system of an abandoned well, which comprises a heat exchange well pipe, wherein the heat exchange well pipe comprises two sections, namely a heat preservation section and a heat exchange section. The geothermal resource utilization process realized by the system is that normal temperature water (such as surface water or system circulating water) enters the abandoned well, the normal temperature water is subjected to heat exchange with the underground stratum in the clearance between the abandoned well pipe and the heat exchange well pipe, the temperature of the normal temperature water is increased, and heated hot water returns to the ground system under the action of the power device, so that continuous heat exchange heating is realized; when used in hot springs Kang Yang to intermittently utilize geothermal resources, the timed withdrawal of hot water can be performed by a power unit. The heat exchange section is made of metal materials, so that on one hand, the rapid heat exchange of surface water or system circulating water introduced into the abandoned well is realized, and on the other hand, the heat exchange section also takes high temperature resistance of the metal materials into consideration, and is relatively heavy in mass, so that the heat exchange well pipe is conveniently put into the abandoned well; the heat preservation section is made of plastic materials so as to preserve heat of the water after temperature rise, prevent the water from heat exchange with a stratum with lower temperature close to the ground surface and reduce the temperature of the water. The system realizes the utilization of geothermal resources by recycling the abandoned well, saves the cost, and has important practical significance for realizing double-carbon targets and optimizing energy structures in China.
Further, plastic pipe with temperature resistance of 40-60 ℃ is selected as the plastic material.
The beneficial effects of the technical scheme are as follows: the heat preservation section is selected according to the temperature which can be reached after the normal temperature water is heated up, thereby meeting the actual requirements.
Further, the metal material is steel.
The beneficial effects of the technical scheme are as follows: the steel material is high temperature resistant and has good heat exchange performance.
Further, the length of the heat exchange section which is arranged at the part with the bottom hole temperature exceeding 60 ℃ is 50-100 m.
The beneficial effects of the technical scheme are as follows: the length of the heat exchange section can be set according to the formation temperature gradient change, so that higher utilization rate can be achieved.
Further, the heat exchange well pipe further comprises a filter which is positioned at the lower side of the heat exchange section in use and is used for filtering water entering the heat exchange well pipe and adding a water inlet channel.
The beneficial effects of the technical scheme are as follows: the impurity removal and the water inlet channel addition of the water entering the heat exchange well pipe can be realized.
Further, the body of the filter is made of metal.
Further, the length of the filter is adjustable and is adapted to be adjusted according to the heat exchange efficiency and the outlet temperature.
The beneficial effects of the technical scheme are as follows: the length of the filter is adjusted according to actual conditions so as to ensure the optimal heat exchange effect while achieving the filtering effect.
Further, the system also comprises a water inlet pipe for allowing normal temperature water to flow into the waste well through the water inlet pipe.
Further, the heat preservation section includes two sections, is heat preservation section and lower heat preservation section respectively, and the upper heat preservation section is located the upside of heat preservation section down when using, and the diameter of upper heat preservation section is greater than heat preservation section down.
The beneficial effects of the technical scheme are as follows: according to the condition adaptability of abandoned well, set up two sections different heat preservation sections of diameter.
Further, the upper heat preservation section and the lower heat preservation section are both made of PVC-U materials.
The beneficial effects of the technical scheme are as follows: the PVC-U material has strong wear resistance, can eliminate noise and absorb shock, and has good heat preservation performance.
Drawings
Fig. 1 is a block diagram of a waste well geothermal resource utilization system of the present invention.
Reference numerals illustrate: 1-a water inlet pipe, 2-a well pipe of an abandoned well, 3-an upper heat preservation section, 4-a power device, 5-a lower heat preservation section, 6-a heat exchange section and 7-a filter.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Example 1 of waste well geothermal resource utilization system:
the geothermal resource utilization system of the abandoned well in the embodiment is used for utilizing geothermal resources of the abandoned well. The abandoned well can be a geothermal well with 1000 m-3000 m of no water or small water quantity, an abandoned oil well with a certain depth and temperature, a salt well, an oil-gas well and the like.
Comprises a power device and a heat exchange well pipe used for being put into a waste well in use. The heat exchange well pipe comprises two sections, namely a heat preservation section and a heat exchange section, and the heat preservation section is positioned on the upper side of the heat exchange section when in use. The power device is used for providing power and is used for pumping out the heated hot water and returning the heated hot water to the ground system, and the most conventional water pump can be selected.
The method comprises the working process that surface water or system circulating water (all normal temperature water) enters the abandoned well, namely enters a gap between a well pipe of the abandoned well and a heat exchange well pipe, after the normal temperature water exchanges heat with underground stratum in the gap between the well pipe of the abandoned well and the heat exchange well pipe, the temperature of the surface normal temperature water is increased, and heated hot water returns to a ground system under the action of a power device so as to realize continuous heat exchange and heating; when used in hot springs Kang Yang to intermittently utilize geothermal water, the timing of the extraction of hot water can be accomplished by a power unit.
In order to realize the above process, the heat preservation section has the main function of preserving heat of hot water and preventing the temperature of the hot water from being reduced due to heat exchange between the hot water and an environment with lower temperature close to the ground surface, so that the heat preservation section is made of plastic materials; the main function of the heat exchange section is to realize heat exchange, so that surface water or system circulating water at normal temperature which enters the abandoned well is heated up rapidly, and the heat exchange section is made of metal materials in consideration of the fact that the heat preservation section made of plastic materials is light and is not easy to sink into the well. Therefore, the geothermal resource utilization of the abandoned well is realized, huge funds can be saved, and the method has important practical significance for realizing double-carbon targets and optimizing energy structures in China.
Example 2 of waste well geothermal resource utilization system:
the geothermal resource utilization system of the abandoned well in this embodiment, as shown in fig. 1, comprises a water inlet pipe 1, a power unit 4 and a heat exchange well pipe for being lowered into the abandoned well in use.
The water inlet pipe 1 is used for introducing surface water or system circulating water (all are normal-temperature water) into the abandoned well, namely, a gap between the well pipe 2 of the abandoned well and the heat exchange well pipe.
The heat exchange well pipe comprises three sections, namely an insulation section, a heat exchange section 6 and a filter 7, and also comprises an upper insulation section 3 and a lower insulation section 5, wherein the upper insulation section 3, the lower insulation section 5, the heat exchange section 6 and the filter 7 are respectively arranged from top to bottom (the direction in figure 1) in use. The heat preservation section is made of plastic materials so as to prevent the water temperature in the heat preservation section from falling, and the heat preservation section is divided into an upper heat preservation section 3 and a lower heat preservation section 5, because the diameters of a plurality of abandoned wells are not invariable, most parts close to the well mouth are larger in diameter, and parts far away from the well mouth are smaller in diameter, so that the heat preservation section is correspondingly provided with the upper heat preservation section 3 and the lower heat preservation section 5, and the diameter of the upper heat preservation section 3 is larger than that of the lower heat preservation section 5 so as to correspond to the situation of the actual abandoned wells. Moreover, the plastic material can be plastic pipe with temperature resistance of 40-60 ℃. The main function of the heat exchange section 6 is to exchange heat for the introduced normal temperature water through the stratum, and the heat exchange section 6 is made of metal (such as steel pipe) in consideration of the fact that the heat preservation section made of plastic is light and is not easy to sink into the abandoned well. The filter 7 is provided for filtering water entering the heat exchange well pipe, and the filter 7 may be made of a metal material, for example, a steel filter pipe. Furthermore, the length of the filter 7 is adjustable, increasing or decreasing its length depending on the heat exchange efficiency and the outlet temperature, to achieve optimal filtration and heat exchange.
The power unit 4 is used to provide power for pumping hot water back out into the ground system, optionally with the most conventional water pump.
The system has the working process that surface water or system circulating water (normal temperature water) enters the abandoned well through the water inlet pipe 1, after the normal temperature water exchanges heat with underground stratum in the clearance between the abandoned well pipe and the heat exchange well pipe, the temperature of the surface normal temperature water is increased, and heated hot water returns to the ground system under the action of the power device 4, and an arrow in the figure 1 indicates the trend of the whole water.
The application range of the system comprises: the bottom hole temperature is 60-100 ℃, the diameter of the lower raw well pipe or the bare hole is more than or equal to 110mm, and the diameter of the upper raw well pipe is more than or equal to 250mm. Correspondingly, after the surface water exchanges heat with the stratum around the well wall and the well shaft, the temperature of the lower fluid can be raised by 15-30 ℃. According to the specification of the raw well pipe, a PVC-U plastic well pipe with the grade less than 1-2 can be selected as a hot water conveying pipeline (namely a heat preservation section). Typically, the upper pumping section PVC-U well pipe (i.e., upper insulation section 3) has a gauge of 225 x 10.8mm or 250 x 11.9mm, and the lower PVC-U well pipe (i.e., lower insulation section 5) has a gauge of 110 x 5.3mm. When the bottom hole temperature exceeds 60 ℃, a steel pipe of 50-100 m can be put in the bottom (this is set by taking the condition of formation temperature gradient change into consideration to set the length of the steel pipe). The upper insulation section 3 and the lower insulation section 5 are made of PVC-U, and of course, as other embodiments, the upper insulation section 3 may be made of PVC, and the lower insulation section 5 may be made of PVC-U.
Specific embodiments are given above, but the invention is not limited to the described embodiments. The basic idea of the invention is that the above basic scheme, it is not necessary for a person skilled in the art to design various modified models, formulas, parameters according to the teaching of the invention to take creative effort. Variations, modifications, substitutions and alterations are also possible in the embodiments without departing from the principles and spirit of the present invention.
Claims (10)
1. The geothermal resource utilization system of the abandoned well is characterized by comprising a heat exchange well pipe used for being put into the abandoned well when in use, wherein the heat exchange well pipe comprises two sections, namely a heat preservation section made of plastic materials and a heat exchange section made of metal materials, and the heat preservation section is positioned on the upper side of the heat exchange section when in use; the heat exchange device is used for exchanging heat between the underground high-temperature stratum and the underground high-temperature stratum, and returning the underground high-temperature stratum to the ground through the heat exchange well pipe.
2. The geothermal resource utilization system of claim 1, wherein the plastic material is a plastic pipe with a temperature resistance of 40 ℃ to 60 ℃.
3. The waste well geothermal resource utilization system of claim 1, wherein the metal material is steel.
4. The waste well geothermal resource utilization system of claim 1, wherein the length of the metal heat exchange portion to be lowered at a portion where the bottom hole temperature exceeds 60 ℃ is 50 to 100m.
5. The waste well geothermal resource utilization system of any one of claims 1 to 4, wherein the heat exchange well pipe further comprises a filter positioned in use below the heat exchange portion for filtering water entering the heat exchange well pipe and adding a water inlet.
6. The waste well geothermal resource utilization system of claim 5, wherein the filter body is metal.
7. The waste well geothermal resource utilization system of claim 5, wherein a length of the filter is adjustable and is configured to adjust according to heat exchange efficiency and outlet temperature.
8. The waste well geothermal resource utilization system of any one of claims 1 to 4, further comprising a water inlet pipe for allowing water at normal temperature to be lowered into the waste well through the water inlet pipe.
9. The waste well geothermal resource utilization system of claim 1, wherein the insulating section comprises two sections, an upper insulating section and a lower insulating section, the upper insulating section being located on an upper side of the lower insulating section in use, the upper insulating section having a larger diameter than the lower insulating section.
10. The waste well geothermal resource utilization system of claim 9, wherein the upper and lower insulating segments are each PVC-U.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311383046 | 2023-10-24 | ||
| CN2023113830461 | 2023-10-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117190515A true CN117190515A (en) | 2023-12-08 |
Family
ID=88998207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311392944.3A Pending CN117190515A (en) | 2023-10-24 | 2023-10-25 | Geothermal resource utilization system of abandoned well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117190515A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO20074796L (en) * | 2007-09-20 | 2009-03-23 | Ziebel As | Procedure for leaving a petroleum well |
| CN106247646A (en) * | 2016-09-08 | 2016-12-21 | 天津大学 | Hot systems is taken under a kind of mid-deep strata geothermal well |
| CN111664601A (en) * | 2020-05-14 | 2020-09-15 | 广东中科光年数智科技有限公司 | Deep geothermal well structure and modification method of waste geothermal well |
| CN112066445A (en) * | 2020-08-31 | 2020-12-11 | 东北石油大学 | Heating system for exploiting terrestrial heat by combining waste oil well with heat pump |
| CN215216745U (en) * | 2021-01-25 | 2021-12-17 | 陕西中煤新能源有限公司 | Middle-deep large-aperture concentric heat exchange structure |
| CN114688752A (en) * | 2022-04-02 | 2022-07-01 | 中煤地质集团有限公司 | Geothermal well transformation method |
-
2023
- 2023-10-25 CN CN202311392944.3A patent/CN117190515A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO20074796L (en) * | 2007-09-20 | 2009-03-23 | Ziebel As | Procedure for leaving a petroleum well |
| CN106247646A (en) * | 2016-09-08 | 2016-12-21 | 天津大学 | Hot systems is taken under a kind of mid-deep strata geothermal well |
| CN111664601A (en) * | 2020-05-14 | 2020-09-15 | 广东中科光年数智科技有限公司 | Deep geothermal well structure and modification method of waste geothermal well |
| CN112066445A (en) * | 2020-08-31 | 2020-12-11 | 东北石油大学 | Heating system for exploiting terrestrial heat by combining waste oil well with heat pump |
| CN215216745U (en) * | 2021-01-25 | 2021-12-17 | 陕西中煤新能源有限公司 | Middle-deep large-aperture concentric heat exchange structure |
| CN114688752A (en) * | 2022-04-02 | 2022-07-01 | 中煤地质集团有限公司 | Geothermal well transformation method |
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