CN114412416A - Heat reservoir and conveying pipeline pump-lifting-free descaling device and using method - Google Patents
Heat reservoir and conveying pipeline pump-lifting-free descaling device and using method Download PDFInfo
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- CN114412416A CN114412416A CN202210014647.4A CN202210014647A CN114412416A CN 114412416 A CN114412416 A CN 114412416A CN 202210014647 A CN202210014647 A CN 202210014647A CN 114412416 A CN114412416 A CN 114412416A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 110
- 238000005086 pumping Methods 0.000 claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 claims abstract description 41
- 235000020681 well water Nutrition 0.000 claims abstract description 18
- 239000002349 well water Substances 0.000 claims abstract description 18
- 239000004576 sand Substances 0.000 claims abstract description 10
- 238000005338 heat storage Methods 0.000 claims description 17
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000000284 extract Substances 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a pump-free descaling device for geothermal reservoirs and conveying pipelines and a using method thereof, and relates to the technical field of geothermal equipment. The geothermal well comprises a ground plane and a geothermal well, wherein the geothermal well is divided into a production well and a recharge well, the production well and the recharge well are consistent in structure, the geothermal well is arranged on the ground plane, one part of the geothermal well is positioned on the upper side of the ground plane, the upper end surface of the geothermal well is fixedly connected with a clamping plate, and the upper surface of the clamping plate is fixedly connected with a supporting seat. The geothermal well is divided into a production well and a recharge well, the production well (recharge well) is pumped and pumped periodically, then geothermal water is extracted, subjected to heat exchange and sand removal treatment, the treated tail water is recharged, a scale remover is added through a pumping device to remove scale on the production well and a conveying pipe inside the production well, well water is recharged to the recharge well, and the scale remover is added through the pumping device, so that circulation is carried out until the scale removal is successful.
Description
Technical Field
The invention belongs to the technical field of geothermal equipment, and particularly relates to a pump-free descaling device for a geothermal reservoir and a conveying pipeline and a using method thereof.
Background
Heat storage refers to a stratum, rock mass or tectonic zone buried underground and having effective gaps and permeability, wherein the stored geothermal fluid can be used for development and utilization. Geothermal energy storage is called heat storage for short, and can store geothermal energy through convection and enrichment of heat-carrying fluid. Therefore, the important characteristic of geothermal heat storage is that the heat storage fluid (tail water) is recharged into the heat storage layer after heat exchange, and the recharged heat storage fluid passes through the heating belt at the bottom of the heat storage layer and heats the recharged heat storage fluid (tail water) under the condition of powerful and continuous conduction heat flow supply. Geothermal heat storage is distinguished from oil, gas and ground water storage in which the original fluid can be supplemented by surrounding thermal storage fluid and heated. This replenishment process is important in geothermal heat storage sports. In order to realize the utilization mode of 'taking heat but not taking water', scaling is one of the main problems in the development and utilization of geothermal fluid, during the production process, the geothermal fluid changes the temperature and the pressure from a reservoir to a wellhead, so that the solubility of minerals changes, part of the minerals are precipitated from the fluid due to supersaturation, a well hole or a pipeline is blocked, and the production efficiency of geothermal heat is reduced. In order to reduce the development and utilization risk of the geothermal field and save the economic cost, a descaling device and a descaling method without a pump are required to be found.
However, in the process of extracting geothermal heat storage, a large amount of scales are easily generated in a pipeline and a heat storage layer in a geothermal well, and the pipeline and the heat storage layer are blocked after a long time, so that the extraction efficiency of geothermal heat is reduced.
Disclosure of Invention
The invention aims to provide a descaling device for a geothermal reservoir and a conveying pipeline without lifting a pump and a using method thereof, and solves the problems that a pipeline and a thermal reservoir in a geothermal well are easy to generate a large amount of scales in the existing geothermal heat storage exploitation process, the pipeline and the thermal reservoir are blocked after a long time, and the geothermal exploitation efficiency is reduced.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a pump-free descaling device for geothermal reservoirs and conveying pipelines, which comprises a ground surface and a geothermal well, wherein the geothermal well is divided into an exploitation well and a recharge well, the exploitation well and the recharge well are consistent in structure, the geothermal well is arranged on the ground surface, one part of the geothermal well is positioned on the upper side of the ground surface, the upper end surface of the geothermal well is fixedly connected with a clamping plate, the upper surface of the clamping plate is fixedly connected with a supporting seat, a recharge pipe and a water pumping pipe are arranged in the supporting seat, the lower ends of the recharge pipe and the water pumping pipe are positioned in the geothermal well, the upper end of the water pumping pipe is communicated with a water outlet pipe, and the upper end of the recharge pipe is also communicated with a water inlet pipe; in the structure, the geothermal well can be used as a production well or a recharge well, and the two wells can be exchanged in function.
Preferably, an exhaust device is installed on the upper surface of the supporting seat and communicated with a geothermal well; in the above structure, the exhaust device may exhaust gas in the geothermal well.
Preferably, the peripheral side surfaces of the water outlet pipe and the water inlet pipe are respectively provided with a pressure gauge, a scale remover pumping pipe and a gate valve, the scale remover pumping pipe is positioned between the pressure gauge and the gate valve, and the gate valve is positioned on one side close to the geothermal well; in the structure, the gate valve can control the flow of the water outlet pipe and the water inlet pipe, and the pressure gauge can monitor the pressure value in the pipeline.
Preferably, the peripheral side surface of the descaling pumping pipe is also provided with a gate valve so as to control the unit internal flow rate of the descaling pumping pipe.
Preferably, one end of the water outlet pipe is fixedly connected with a sand removing and extracting heat exchange device so as to carry out operations such as extraction, heat exchange and sand removal on the return water.
Preferably, the lower end face of the water pumping pipe is also provided with a geothermal pump, and the geothermal pump has the function that the low-grade heat energy is transferred to the high-grade heat energy by inputting a small amount of high-grade energy into the shallow-layer land energy.
Preferably, a plurality of water filter pipes are arranged on the peripheral side surface of the geothermal well, the water filter pipes are positioned at the lower end of the geothermal well, and underground water can enter the bottom of the geothermal well through the water filter pipes.
The invention relates to a method for using a pump-free descaling device for a geothermal reservoir and a conveying pipeline, which comprises the following steps:
the method comprises the following steps: pumping water and pumping back a production well and a recharge well in a geothermal well under the condition that the device is not dirty, enabling well water to sequentially pass through a water pumping pipe and a water outlet pipe, and then calculating the water yield of the water pumping pipe and the water outlet pipe in unit time to obtain the initial water yield of the device in unit time;
step two: when scales are accumulated, pumped well water passes through a sand removal and extraction heat exchange device to be extracted, heat exchange and sand removal are carried out, geothermal tail water after heat exchange sequentially passes through a water inlet pipe and a recharge pipe to be recharged into a production well, a scale remover is added into the water inlet pipe through a scale remover pumping pipe during recharging, the scale remover enters the production well along with the geothermal tail water, the scale remover sequentially reaches a pump body section and a heat storage layer section at the bottom of the production well along with the transportation of the geothermal tail water, the scale remover and a scale part are subjected to chemical reaction to generate water-soluble gas and chemical green-friendly components, and the gas and the chemical green-friendly components enter the bottom of the production well or are discharged out of the production well along with the well water.
Step three: after reacting for a period of time, pumping water and raising the production well again, continuously pumping a scale remover, comparing the scale removal effects of the geothermal reservoir, the water inlet pipe and other transmission pipelines at the bottom of the production well according to the water yield detection, and then continuously pumping water and raising;
step four: and (3) deslagging and desanding the pumped water, then recharging the pumped water to the production well, pumping a scale remover into the production well, reacting for a period of time, then pumping back to descale the conveying pipeline, deslagging and desanding, injecting the water into the recharging well, simultaneously pumping the scale remover, and pumping back to each other, repeating the steps until the water yield reaches an initial value or approaches to the initial value, and then successfully descaling.
The invention has the following beneficial effects:
the invention divides the geothermal well into a production well and a recharge well, periodically pumps water and pumps the production well (recharge well), then extracts, exchanges heat and desands geothermal water, recharges the treated tail water, adds a scale remover by a pumping device to descale the production well and a conveying pipe inside the production well, pumps water and pumps the geothermal water again and recharges the well (production well), extracts, exchanges heat and desands the geothermal water, recharges well water to the recharge well and adds the scale remover by the pumping device, and repeatedly pumps the well water until the water yield of the production well (recharge well) reaches an initial value or approaches the initial value during pumping, so that the descaling is successful.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a geothermal reservoir and a conveying pipeline descaling device without a pump according to the invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1-a ground surface, 2-a sand removing and extracting heat exchange device, 3-a water outlet pipe, 4-a gate valve, 5-a scale remover pumping pipe, 6-a pressure measuring meter, 7-a water inlet pipe, 8-a supporting seat, 9-a clamping plate, 10-a recharging pipe, 11-a water filtering pipe, 12-a ground heat pump, 13-a water pumping pipe, 14-a ground heat well and 15-an exhaust device.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper," "middle," "outer," "inner," "around," and the positional relationships are used merely for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1, the invention relates to a pump-free descaling device for geothermal reservoirs and conveying pipelines, which comprises a ground surface 1 and a geothermal well 14, wherein the geothermal well 14 is divided into a production well and a recharge well, the production well and the recharge well are consistent in structure, the geothermal well 14 is arranged on the ground surface 1, one part of the geothermal well 14 is positioned on the upper side of the ground surface 1, the upper end surface of the geothermal well 14 is fixedly connected with a clamping plate 9, the upper surface of the clamping plate 9 is fixedly connected with a supporting seat 8, a recharge pipe 10 and a water pumping pipe 13 are arranged in the supporting seat 8, the lower ends of the recharge pipe 10 and the water pumping pipe 13 are positioned in the geothermal well 14, the upper end of the water pumping pipe 13 is communicated with a water outlet pipe 3, and the upper end of the recharge pipe 10 is also communicated with a water inlet pipe 7; in the above structure, the geothermal well 14 can be used as a production well or a recharge well, and the functions of the two can be exchanged.
Wherein, the upper surface of the supporting seat 8 is provided with an exhaust device 15, and the exhaust device 15 is communicated with the geothermal well 14; in the above structure, the exhaust device 15 can exhaust the gas in the geothermal well 14.
The descaling agent pumping pipe 5 is positioned between the pressure gauge 6 and the gate valve 4, and the gate valve 4 is positioned at one side close to the geothermal well 14; in the structure, the gate valve 4 can control the flow of the water outlet pipe 3 and the water inlet pipe 7, and the pressure gauge 6 can monitor the pressure value in the pipeline.
Wherein, the gate valve 4 is also arranged on the peripheral side surface of the descaling agent pumping pipe 5 so as to control the unit internal flow of the descaling agent pumping pipe 5.
Wherein, the one end fixedly connected with degritting of outlet pipe 3, draw heat transfer device 2 to carry out operations such as extraction, heat transfer, degritting to the return water.
Wherein, the lower terminal surface of drinking-water pipe 13 still installs ground heat pump 12, and ground heat pump 12's function is that the shallow layer energy of land realizes from low-grade heat energy to high-grade heat energy transfer through inputing a small amount of high-grade energy.
Wherein, a plurality of strainer pipes 11 are arranged on the peripheral side of the geothermal well 14, the strainer pipes 11 are positioned at the lower end of the geothermal well 14, and the groundwater can enter the bottom of the geothermal well 14 through the strainer pipes 11.
The invention relates to a method for using a pump-free descaling device for a geothermal reservoir and a conveying pipeline, which comprises the following steps:
the method comprises the following steps: pumping water and pumping back a production well and a recharge well in a geothermal well 14 under the condition that the device is not dirty, enabling well water to sequentially pass through a water pumping pipe 13 and a water outlet pipe 3, and then calculating the water yields of the water pumping pipe 13 and the water outlet pipe 3 in unit time to obtain the initial water yield of the device in unit time;
step two: when scales are accumulated, pumped well water passes through the sand removal and extraction heat exchange device 2 to be extracted, heat exchange and sand removal, then the well water is sequentially returned to the production well through the water inlet pipe 7 and the return pipe 10, a scale remover is added to the water inlet pipe 7 through the scale remover pumping pipe 5 during return, the scale remover enters the production well along with the well water, the scale remover sequentially reaches the pump body section and the carbonate heat storage layer section at the bottom of the production well along with the movement of the well water, the scale remover and the scale forming part are subjected to chemical reaction to generate gas and chemical friendly components dissolved in the water, and the gas and the chemical friendly components enter the bottom of the production well or are discharged out of the production well along with the well water.
Step three: after reacting for a period of time, pumping water and raising the exploitation well again and continuously pumping in a scale remover, comparing the scale removing effects of the geothermal reservoir at the bottom of the exploitation well and the transmission pipelines such as the water inlet pipe 7 and the like according to the water yield detection, and then continuously pumping water and raising;
step four: and (3) deslagging and desanding the pumped water, then recharging the pumped water to the production well, pumping a scale remover into the production well, reacting for a period of time, then pumping back to descale the conveying pipeline, deslagging and desanding, injecting the water into the recharging well, simultaneously pumping the scale remover, and pumping back to each other, repeating the steps until the water yield reaches an initial value or approaches to the initial value, and then successfully descaling.
It should be noted that, in the process of pumping water, the device needs to use a water pump, and because the depths of the geothermal wells 14 are different, the output powers of the water pumps used are also different, specifically based on the actual use situation.
It should be further noted that the openings of the gate valves 4 should be opened to the most uniform degree when the water pumping is performed.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. The utility model provides a geothermal reservoir and conveying line do not carry pump scale removal device, includes ground face (1) and geothermal well (14), its characterized in that:
the geothermal well (14) is divided into a production well and a recharge well, the production well and the recharge well are consistent in structure, the geothermal well (14) is installed on the ground surface (1), and one part of the geothermal well (14) is located on the upper side of the ground surface (1).
2. The pump-free descaling device for geothermal reservoirs and conveying pipelines according to claim 1, wherein a clamping plate (9) is fixedly connected to the upper end face of the geothermal well (14), a supporting seat (8) is fixedly connected to the upper surface of the clamping plate (9), a recharge pipe (10) and a water pumping pipe (13) are installed in the supporting seat (8), the lower ends of the recharge pipe (10) and the water pumping pipe (13) are located inside the geothermal well (14), the upper end of the water pumping pipe (13) is communicated with a water outlet pipe (3), and the upper end of the recharge pipe (10) is also communicated with a water inlet pipe (7).
3. A geothermal reservoir and transfer line non-pumping descaling device according to claim 2, wherein the support base (8) is provided with an air exhaust device (15) on the upper surface, and the air exhaust device (15) is communicated with the geothermal well (14).
4. A geothermal reservoir and conveying pipeline non-pumping descaling device according to claim 2, wherein the peripheral side surfaces of the water outlet pipe (3) and the water inlet pipe (7) are respectively provided with a pressure measuring meter (6), a descaling agent pumping pipe (5) and a gate valve (4), the descaling agent pumping pipe (5) is positioned between the pressure measuring meter (6) and the gate valve (4), and the gate valve (4) is positioned at one side close to the geothermal well (14).
5. A geothermal reservoir and transfer line non-pumping descaling device according to claim 4, wherein the peripheral side surface of the descaling agent pumping pipe (5) is also provided with a gate valve (4).
6. A geothermal reservoir and a conveying pipeline pump-free descaling device according to claim 2, wherein one end of the water outlet pipe (3) is fixedly connected with a sand-removing and extracting heat exchange device (2).
7. A geothermal reservoir and transfer line non-pumping descaling device according to claim 2, wherein the lower end surface of the pumping pipe (13) is also provided with a geothermal pump (12).
8. A geothermal reservoir and a conveying pipeline pump-free descaling device according to claim 1, wherein a plurality of water filter pipes (11) are arranged on the peripheral side of the geothermal well (14), and the water filter pipes (11) are arranged at the lower end of the geothermal well (14).
9. The use method of the device for removing scale from the geothermal reservoir and the conveying pipeline without pumping in any one of claims 1 to 7 is characterized by comprising the following steps:
the method comprises the following steps: pumping water and pumping back a production well and a recharge well in a geothermal well (14) under the condition that the device is not dirty, enabling well water to sequentially pass through a water pumping pipe (13) and a water outlet pipe (3), and then calculating the water yield of the water pumping pipe (13) and the water outlet pipe (3) in unit time to obtain the initial water yield of the device in unit time;
step two: when scales are accumulated, pumped well water passes through the sand removal and extraction heat exchange device (2) to be extracted, heat exchange and sand removal are carried out, then the well water is sequentially returned to the exploitation well through the water inlet pipe (7) and the return pipe (10), a scale remover is added into the water inlet pipe (7) through the scale remover pumping pipe (5) during return, the scale remover enters the exploitation well along with the well water, the scale remover sequentially reaches the pump body section and the carbonate heat storage layer section at the bottom of the exploitation well along with the transportation of the well water, the scale remover and a scale forming part are subjected to chemical reaction, gas dissolved in the water and chemical green components are generated, and the gas and the chemical green components enter the bottom of the exploitation well or are discharged out of the exploitation well along with the well water.
Step three: after reacting for a period of time, pumping water and raising the exploitation well again, continuously pumping a scale remover, comparing the scale removing effects of the geothermal reservoir at the bottom of the exploitation well, the water inlet pipe (7) and other transmission pipelines according to the water yield detection, and then continuously pumping water and raising;
step four: and (3) deslagging and desanding the pumped water, then recharging the pumped water to the production well, pumping a scale remover into the production well, reacting for a period of time, then pumping back to descale the conveying pipeline, deslagging and desanding, injecting the water into the recharging well, simultaneously pumping the scale remover, and pumping back to each other, repeating the steps until the water yield reaches an initial value or approaches to the initial value, and then successfully descaling.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210014647.4A CN114412416A (en) | 2022-03-09 | 2022-03-09 | Heat reservoir and conveying pipeline pump-lifting-free descaling device and using method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210014647.4A CN114412416A (en) | 2022-03-09 | 2022-03-09 | Heat reservoir and conveying pipeline pump-lifting-free descaling device and using method |
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| CN215979320U (en) * | 2021-10-12 | 2022-03-08 | 陕西新眉清洁能源有限公司 | Geothermal well group mining and irrigating mutual-reversing wellhead device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103816714A (en) * | 2014-03-13 | 2014-05-28 | 中石化绿源地热能开发有限公司 | Economical recharge system for sandstone geothermal tail water |
| CN206330199U (en) * | 2016-12-29 | 2017-07-14 | 天津汇达热力集团有限公司 | A kind of geothermal energy effective utilization system |
| US20210062682A1 (en) * | 2018-02-08 | 2021-03-04 | Greenfire Energy Inc. | Closed loop energy production from producing geothermal wells |
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