CN213778218U - Oil well heat energy recycling system - Google Patents
Oil well heat energy recycling system Download PDFInfo
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- CN213778218U CN213778218U CN202022434943.9U CN202022434943U CN213778218U CN 213778218 U CN213778218 U CN 213778218U CN 202022434943 U CN202022434943 U CN 202022434943U CN 213778218 U CN213778218 U CN 213778218U
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- working medium
- heat
- heat exchanger
- hot water
- oil well
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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
Abstract
The utility model provides an oil well heat energy cyclic utilization system, which comprises a phase-change gasification working medium, a sleeve and an oil pipe, and also comprises an underground heat exchange unit, wherein the underground heat exchange unit comprises a first heat exchanger and a working medium pipe, the first heat exchanger is arranged in a hot water layer at the bottom of an oil well, and the working medium pipe is communicated with a working medium side inlet of the first heat exchanger; a first annular chamber is formed between the sleeve and the oil pipe, the bottom of the first annular chamber is closed, a second annular chamber is formed between the oil pipe and the working medium pipe, and the second annular chamber is communicated with a working medium side outlet of the first heat exchanger. The oil well heat energy recycling system is provided with the heat exchanger at the bottom of the oil well, so that the heat exchange efficiency is greatly improved, and the heat taking quantity and the heat taking temperature are greatly improved. The liquid working medium is converted into a high-temperature gaseous working medium after heat exchange, the speed of the liquid working medium rising to the ground from the underground is greater than the speed of the hot water pump returning to the ground in the prior art, heat loss is greatly reduced, and the purpose that the system obtains large heat and high temperature is further ensured.
Description
Technical Field
The utility model relates to an oil well heat energy utilization field, in particular to oil well heat energy cyclic utilization system.
Background
The prior oil well heat energy utilization mode in China generally comprises the steps of injecting water serving as a heat-carrying working medium into an annular space between an oil well casing and an oil pipe, heating part of water by utilizing geothermal heat of a deep layer of the ground, pumping the heated water back to the ground from the oil pipe, and then entering a heat utilization device for heat extraction and utilization. Because the heat quantity of water and formation direct exchange is limited, the mode is small in heat quantity taking quantity and low in heat taking temperature, and because the temperature of the water going to the ground is lower, the heat quantity loss of the heated water in the process of pumping the water back to the ground is serious, and the loss of the heat quantity taking quantity and the heat taking temperature is further aggravated.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model discloses aim at providing an oil well heat energy cyclic utilization system through institutional advancement and optimization.
The technical scheme of the oil well heat energy recycling system is realized as follows:
the oil well heat energy recycling system comprises a working medium capable of phase change gasification, a sleeve and an oil pipe, wherein the sleeve is arranged in an oil well, the oil pipe is arranged in the sleeve, the oil well heat energy recycling system also comprises an underground heat exchange unit, the underground heat exchange unit comprises a first heat exchanger and a working medium pipe, the first heat exchanger is arranged in a hot water layer at the bottom of the oil well, a hot water side inlet and an outlet of the first heat exchanger are connected with an underground hot water layer, the working medium pipe is arranged in the oil pipe, and the working medium pipe extends into the bottom of the oil well from the oil pipe and is communicated with the working medium side inlet of the first heat exchanger;
a first annular chamber is formed between the sleeve and the oil pipe, the bottom of the first annular chamber is closed, a second annular chamber is formed between the oil pipe and the working medium pipe, and the second annular chamber is communicated with a working medium side outlet of the first heat exchanger;
the working medium enters the first heat exchanger from the working medium pipe to exchange heat with the underground hot water layer, and after the heat is absorbed, the working medium is gasified in a phase change manner and flows out of the second annular chamber to reach the ground.
Furthermore, the oil well heat energy recycling system also comprises an aboveground heat exchange unit, wherein the aboveground heat exchange unit comprises a second heat exchanger, a heat utilization device, a hot water pipeline and a working medium pipeline, and the second heat exchanger comprises a hot water inlet, a hot water outlet, a working medium inlet and a working medium outlet;
the hot water outlet and the heat utilization device, and the heat utilization device and the hot water inlet are connected through hot water pipelines, and the working medium outlet and the working medium pipe, and the second annular chamber and the working medium inlet are connected through working medium pipelines.
Furthermore, a vacuum pump is arranged at a port of the first annular chamber.
Further, at least one first heat exchanger is arranged.
Furthermore, a plurality of first heat exchangers are arranged in each hot water layer at the bottom of the oil well.
Furthermore, a hot water circulating pump is connected in series on a hot water pipeline between the heat utilization device and the hot water inlet.
Furthermore, a working medium circulating pump is connected in parallel to the working medium pipeline between the working medium outlet and the working medium pipe.
Further, the first heat exchanger is a plate heat exchanger or a tubular heat exchanger.
Further, the second heat exchanger is a plate heat exchanger or a tubular heat exchanger.
When the oil well heat energy recycling system works, liquid working media automatically flow or are pumped into the first heat exchanger at the bottom of an oil well from the working medium pipe, the liquid working media exchange heat with underground hot water in the first heat exchanger, the liquid working media absorb heat and are gasified, and the gasified high-temperature gaseous working media continuously rise from the second annular chamber to reach the ground and enter a subsequent heat taking link. The oil well heat energy recycling system is provided with the heat exchanger at the bottom of the oil well, so that the heat exchange efficiency is greatly improved, and the heat taking quantity and the heat taking temperature are greatly improved. The liquid working medium is converted into the high-temperature gaseous working medium after heat exchange, the speed of the liquid working medium which rises to the ground from the underground is greatly higher than the speed of the hot water pump returning to the ground, the heat loss in the process is greatly reduced, the purpose that the system obtains large heat and high temperature is further ensured, and the power consumption of the hot water pump returning to the ground is reduced.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 is a schematic structural diagram of the oil well heat energy recycling system.
Description of reference numerals:
in the figure: 1. the oil well, 2 casing, 3 oil pipe, 4 working medium pipe, 5, first heat exchanger, 6, second heat exchanger, 7 working medium circulating pump, 8 hot water circulating pump, 9 heat utilization device, 10 vacuum pump, 11 first annular chamber, 12 second annular chamber, 13 hot water pipeline, 14 working medium pipeline, 61 hot water inlet, 62 hot water outlet, 63 working medium inlet, 64 working medium outlet.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The oil well heat energy recycling system comprises a phase-change gasification working medium, a sleeve 2 and an oil pipe 3 as shown in figure 1, wherein the sleeve 2 is arranged in an oil well 1, the oil pipe 3 is arranged in the sleeve 2, the heat exchanger also comprises an underground heat exchange unit, the underground heat exchange unit comprises a first heat exchanger 5 and a working medium pipe 4, the first heat exchanger 5 is arranged in a hot water layer at the bottom of the oil well 1, at least one first heat exchanger 5 is arranged, if the stratum conditions permit, a plurality of first heat exchangers 5 can be adopted to respectively extract the heat of different hot water layers, so that the absorbed energy is higher, the temperature is also higher, the working medium pipe 4 is arranged in the oil pipe 3, the oil pipe 3 extends into the bottom of the oil well 1 and is communicated with a working medium side inlet of the first heat exchanger 5, a hot water side inlet and a hot water side outlet of the first heat exchanger 5 are connected with an underground hot water layer, and the heat of underground hot water is led into the first heat exchanger 5 to provide the heat required by phase change gasification of the working medium;
a first annular chamber 11 is formed between the casing 2 and the oil pipe 3, the bottom of the first annular chamber 11 is closed, a second annular chamber 12 is formed between the oil pipe 3 and the working medium pipe 4, the second annular chamber 12 is communicated with a working medium side outlet of the first heat exchanger 5, and the first heat exchanger 5, the casing 2, the oil pipe 3 and the working medium pipe 4 can be physically isolated from each other, preferably, are isolated from each other by a separator;
the working medium enters the first heat exchanger 5 from the working medium pipe 4 to exchange heat with the underground hot water layer, and after absorbing heat, the working medium is gasified in a phase change manner and flows out of the second annular chamber 12 to reach the ground.
When the oil well heat energy recycling system works, a liquid working medium, such as a hydrocarbon mixture, an environment-friendly ammonia compound type refrigerant automatically flows or is pumped into the first heat exchanger 5 at the bottom of an oil well from the working medium pipe 4, the liquid working medium exchanges heat with underground hot water in the first heat exchanger 5, the liquid working medium is gasified after absorbing heat, and the gasified high-temperature gaseous working medium continuously rises from the second annular chamber 12 and directly reaches the ground to enter a subsequent heat taking link. The oil well heat energy recycling system is provided with the heat exchanger at the bottom of the oil well, so that the heat exchange efficiency is greatly improved, and the heat taking quantity and the heat taking temperature are greatly improved. The liquid working medium is converted into the high-temperature gaseous working medium after heat exchange, the speed of the liquid working medium which rises to the ground from the underground is greatly higher than the speed of the hot water pump returning to the ground, the heat loss in the process is greatly reduced, the purpose that the system obtains large heat and high temperature is further ensured, and the power consumption of the hot water pump returning to the ground is reduced.
The oil well heat energy recycling system also comprises an aboveground heat exchange unit, wherein the aboveground heat exchange unit comprises a second heat exchanger 6, a heat utilization device 9, a hot water pipeline 13 and a working medium pipeline 14, and the second heat exchanger 6 comprises a hot water inlet 61, a hot water outlet 62, a working medium inlet 63 and a working medium outlet 64;
the hot water outlet 62 is connected with the heat utilization device 9, the heat utilization device 9 is connected with the hot water inlet 61 through a hot water pipeline 13, and the working medium outlet 64 is connected with the working medium pipe 4, and the second annular chamber 12 is connected with the working medium inlet 63 through a working medium pipeline 14. A hot water circulating pump 8 is connected in series on the hot water pipeline 13 between the heat utilization device 9 and the hot water inlet 61, and a working medium circulating pump 7 is connected in parallel on the working medium pipeline 14 between the working medium outlet 64 and the working medium pipe 4.
The high-temperature gaseous working medium flowing out of the second annular chamber 12 enters the second heat exchanger 6, the temperature is reduced after the heat of the high-temperature gaseous working medium is transferred to the heat utilization device 9 for heat extraction, the high-temperature gaseous working medium flows back to the hot water of the second heat exchanger 6, the high-temperature gaseous working medium is converted into a liquid working medium, then the liquid working medium flows into or is pumped into the working medium pipe 4 and enters the first heat exchanger 5 for heat acquisition, and the process is repeated; the temperature of the hot water flowing back to the second heat exchanger 6 is increased after the hot water is heated by the self-heating device 9, the hot water enters the self-heating device 9, the temperature of the hot water is reduced after the hot water is heated by the self-heating device 9, and the hot water is circulated to flow into the second heat exchanger 6 to obtain heat in cycles.
In the oil well heat energy recycling system, the vacuum pump 10 is arranged at the port of the first annular chamber 11, the first annular chamber 11 is vacuumized by the vacuum pump 10, further, a pressure sensor can be arranged in the first annular chamber 11, and the starting and stopping of the vacuum pump 10 are controlled by a known control system, such as a PLC (programmable logic controller), so that the vacuum degree of the first annular chamber 11 is kept in a stable state, the vacuum environment can further reduce the heat loss of high-temperature gaseous working media in the process of conveying the high-temperature gaseous working media from the underground to the ground, and the heat loss is minimized.
In the oil well heat energy recycling system, the first heat exchanger 5 is a plate heat exchanger or a tubular heat exchanger, and the heat exchanger is made of stainless steel or titanium alloy, so that the corrosion of formation hot water can be resisted, and the service life of equipment is prolonged; in the oil well heat energy recycling system, the second heat exchanger 6 is a plate heat exchanger or a tubular heat exchanger, and the heat exchanger is made of stainless steel or titanium alloy, so that the corrosion of heat supply circulating water can be reduced, and the service life of equipment is prolonged.
In the oil well heat energy recycling system, valves can be arranged on various pipes and pipelines according to actual requirements.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides an oil well heat energy cyclic utilization system, is including can phase transition gasification working medium, sleeve pipe (2) and oil pipe (3), and oil well (1) is arranged in to sleeve pipe (2), and during sleeve pipe (2) were arranged in to oil pipe (3), its characterized in that: the oil well heat exchanger is characterized by further comprising an underground heat exchange unit, wherein the underground heat exchange unit comprises a first heat exchanger (5) and a working medium pipe (4), the first heat exchanger (5) is arranged in a hot water layer at the bottom of the oil well (1), a hot water side inlet and a hot water side outlet of the first heat exchanger (5) are connected with an underground hot water layer, the working medium pipe (4) is arranged in the oil pipe (3), and the oil pipe (3) penetrates into the bottom of the oil well (1) and is communicated with a working medium side inlet of the first heat exchanger (5);
a first annular chamber (11) is formed between the casing (2) and the oil pipe (3), the bottom of the first annular chamber (11) is closed, a second annular chamber (12) is formed between the oil pipe (3) and the working medium pipe (4), and the second annular chamber (12) is communicated with a working medium side outlet of the first heat exchanger (5);
the working medium enters the first heat exchanger (5) from the working medium pipe (4) to exchange heat with the underground hot water layer, and after heat is absorbed, the working medium is gasified in a phase change manner and flows out of the second annular chamber (12) to reach the ground.
2. The oil well thermal energy recycling system of claim 1, wherein: the system also comprises an aboveground heat exchange unit, wherein the aboveground heat exchange unit comprises a second heat exchanger (6), a heat utilization device (9), a hot water pipeline (13) and a working medium pipeline (14), and the second heat exchanger (6) comprises a hot water inlet (61), a hot water outlet (62), a working medium inlet (63) and a working medium outlet (64);
the hot water outlet (62) is connected with the heat utilization device (9), the heat utilization device (9) is connected with the hot water inlet (61) through a hot water pipeline (13), and the working medium outlet (64) is connected with the working medium pipe (4), and the second annular chamber (12) is connected with the working medium inlet (63) through a working medium pipeline (14).
3. The oil well thermal energy recycling system of claim 2, wherein: a port of the first annular chamber (11) is provided with a vacuum pump (10).
4. The oil well thermal energy recycling system of claim 1, 2 or 3, characterized by: at least one first heat exchanger (5) is arranged.
5. The oil well thermal energy recycling system of claim 4, wherein: the first heat exchangers (5) are arranged in each hot water layer at the bottom of the oil well (1).
6. The oil well thermal energy recycling system of claim 2, wherein: a hot water circulating pump (8) is connected in series on a hot water pipeline (13) between the heat utilization device (9) and the hot water inlet (61).
7. The oil well thermal energy recycling system of claim 2, wherein: and a working medium circulating pump (7) is connected in parallel to the working medium pipeline (14) between the working medium outlet (64) and the working medium pipe (4).
8. The oil well thermal energy recycling system of claim 1, wherein: the first heat exchanger (5) is a plate heat exchanger or a tubular heat exchanger.
9. The oil well thermal energy recycling system of claim 2, wherein: the second heat exchanger (6) is a plate heat exchanger or a tubular heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022434943.9U CN213778218U (en) | 2020-10-28 | 2020-10-28 | Oil well heat energy recycling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022434943.9U CN213778218U (en) | 2020-10-28 | 2020-10-28 | Oil well heat energy recycling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213778218U true CN213778218U (en) | 2021-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022434943.9U Active CN213778218U (en) | 2020-10-28 | 2020-10-28 | Oil well heat energy recycling system |
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| Country | Link |
|---|---|
| CN (1) | CN213778218U (en) |
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2020
- 2020-10-28 CN CN202022434943.9U patent/CN213778218U/en active Active
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