CN114412416A - A pump-free descaling device for a geothermal heat reservoir and a transmission pipeline and a method for using the same - Google Patents

Abstract

The invention discloses a pump-free descaling device and a using method for a geothermal heat reservoir and a conveying pipeline, and relates to the technical field of geothermal equipment. The invention includes a foundation surface and a geothermal well. The geothermal well is divided into a mining well and a recharging well. The mining well and the recharging well have the same structure. A geothermal well is installed on the foundation surface. A splint is fixedly connected, and a support seat is fixedly connected to the upper surface of the splint. In the present invention, the geothermal well is divided into a mining well and a recharge well, and the mining well (recharge well) is periodically pumped and raised, and then the geothermal water is extracted, heat exchanged, and sand removed. The treated tail water Carry out recharge and add descaling agent through the pumping device to descale the mining well and its internal pipelines, and recharge the well water to the reinjection well and add descaling agent through the pumping device, so as to circulate, until descaling is successful.

Description

A pump-free descaling device for a geothermal heat reservoir and a transmission pipeline and a method for using the same

technical field

The invention belongs to the technical field of geothermal equipment, and in particular relates to a pump-free descaling device for a geothermal thermal reservoir and a conveying pipeline and a method for using the same.

Background technique

Thermal storage refers to the strata, rock mass or structural zone buried underground, with effective voids and permeability, in which the stored geothermal fluid can be developed and utilized. Geothermal thermal storage is referred to as thermal storage, which can store geothermal energy through convection and enrichment of heat-carrying fluids. Therefore, a very important feature of geothermal thermal storage is that the thermal storage fluid (tail water) is recharged into the thermal storage layer after heat exchange, and the recharged thermal storage fluid passes through the heating zone at the bottom of the thermal storage layer, and conducts strong and continuous conduction. Under the condition of heat flow replenishment, the recharged heat storage fluid (tail water) is heated. Geothermal thermal storage is different from oil storage, gas storage and groundwater storage. In geothermal thermal storage, the original stored fluid can be replenished and heated by the surrounding thermal storage fluid. This replenishment process is very important in the movement of geothermal heat storage. It is the utilization mode of "taking heat without taking water", and scaling is one of the main problems in the development and utilization of geothermal fluids. During the mining process, the temperature and pressure of the geothermal fluid change from the reservoir to the wellhead, resulting in the solubility of minerals. Changes, some minerals will be precipitated from the fluid due to supersaturation, blocking wells or pipelines, reducing the efficiency of geothermal mining. In order to reduce the development and utilization risks of geothermal fields and save economic costs, it is necessary to seek a pump-free descaling device and method.

However, in the mining process of geothermal thermal storage, the pipelines and thermal reservoirs in the geothermal wells are prone to produce a large amount of scale. Over time, the pipelines and thermal reservoirs will be blocked, reducing the mining efficiency of geothermal heat. The present invention aims at the above-mentioned The problem is to propose a pump-free descaling device for geothermal heat reservoirs and transmission pipelines and a method for using them.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a pump-free descaling device and a method for using the geothermal heat reservoir and the transmission pipeline, which solves the problem that during the exploitation of the existing geothermal heat storage, the pipelines and the thermal reservoir in the geothermal well are prone to produce a large amount of The scale body, over time, will block the pipeline and the thermal reservoir, reducing the problem of geothermal production efficiency.

In order to solve the above-mentioned technical problems, the present invention is achieved through the following technical solutions:

The present invention is a pump-free descaling device for geothermal heat reservoirs and conveying pipelines, comprising a foundation surface and a geothermal well. The geothermal well is divided into a exploitation well and a recharge well, and the exploitation well and the recharge well have the same structure. A geothermal well is installed on the foundation surface, a part of the geothermal well is located on the upper side of the foundation surface, a splint is fixedly connected to the upper end surface of the geothermal well, a support seat is fixedly connected to the upper surface of the splint, and a support seat is installed in the support seat. The recharge pipe and the water pumping pipe, the lower ends of the recharge pipe and the water pumping pipe are located inside the geothermal well, the upper end of the water pumping pipe is connected with a water outlet pipe, and the upper end of the recharge pipe is also connected with a water inlet pipe; in the above structure, Geothermal wells can be used as both production wells and recharge wells, and the functions of the two can be interchanged.

Preferably, an exhaust device is installed on the upper surface of the support base, and the exhaust device communicates with the geothermal well; in the above structure, the exhaust device can discharge the gas in the geothermal well.

Preferably, a pressure gauge, a descaling agent pumping pipe and a gate valve are installed on the peripheral sides of the water outlet pipe and the water inlet pipe, the descaling agent pumping pipe is located between the pressure measuring instrument and the gate valve, and the gate valve is located in the Close to the side of the geothermal well; in the above 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, a gate valve is also installed on the peripheral side of the descaling agent pumping pipe, so as to control the flow rate per unit of the descaling agent pumping pipe.

Preferably, one end of the water outlet pipe is fixedly connected with a sand removal, extraction and heat exchange device, so as to facilitate the extraction, heat exchange, sand removal and other operations of the return water.

Preferably, a geothermal pump is also installed on the lower end surface of the water pumping pipe, and the function of the geothermal pump is to realize the transfer of low-grade heat energy to high-grade heat energy by inputting a small amount of high-grade energy from shallow terrestrial energy.

Preferably, a plurality of water filtering pipes are opened on the peripheral side of the geothermal well, the water filtering pipes are located at the lower end of the geothermal well, and groundwater can enter the bottom of the geothermal well through the water filtering pipes.

The present invention relates to a method for using a geothermal heat reservoir and a pump-free descaling device for conveying pipelines, comprising the following steps:

Step 1: Under the condition that the device is free of scale, pump water back to the mining well and recharge well in the geothermal well, and the well water will pass through the pumping pipe and the water outlet pipe in turn, and then calculate the water output of the pumping pipe and the water outlet pipe per unit time. This obtains the initial water output per unit time of the device;

Step 2: When the scale of the device accumulates, the pumped well water is passed through the sand removal, extraction heat exchange device, and the operations of extraction, heat exchange and sand removal are carried out, and then the geothermal tail water after heat exchange is passed through the water inlet pipe and the return pipe in turn. The irrigation pipe is refilled into the mining well, and the descaling agent is added to the water inlet pipe through the descaling agent pumping pipe at the same time. After moving to the pump body section and the hot reservoir section at the bottom of the production well, the descaling agent chemically reacts with the fouling site to generate water-soluble gas and chemical green-friendly components, and along with the well water enters the bottom of the production well or Drain out of the well.

Step 3: After reacting for a period of time, pump water back up the production well again and continue to pump the descaling agent, and compare the descaling effect of the geothermal reservoir at the bottom of the production well and the pipelines such as the water inlet pipe according to the water output detection, Then continue to pump water back up;

Step 4: After removing slag and sand, the back-raised water is recharged to the mining well, and the descaling agent is pumped into the mining well. After reacting for a period of time, it is raised again to remove the scale of the conveying pipeline. After that, inject into the recharge well and pump the descaling agent at the same time, which are mutually back-lifting, and this is repeated until the water output reaches the initial value or is close to the initial value, then the descaling is successful.

The present invention has the following beneficial effects:

In the present invention, the geothermal well is divided into a mining well and a recharge well, and the mining well (recharge well) is periodically pumped and raised, and then the geothermal water is extracted, heat exchanged, and sand removed, and the treated tail water Carry out recharge and add descaling agent through the pumping device to descale the mining well and its internal pipelines, and then pump water back to the recharge well (production well) to extract, exchange heat, and remove geothermal water. Then, the well water is recharged to the recharge well and the descaling agent is added through the pumping device, and they are pumped back several times. Descale successfully.

Of course, it is not necessary for any product embodying the present invention to achieve all of the above-described advantages simultaneously.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a pump-free descaling device for a geothermal heat reservoir and a transport pipeline according to the present invention.

In the accompanying drawings, the list of components represented by each number is as follows:

1- foundation surface, 2- sand removal, extraction heat exchange device, 3- water outlet pipe, 4- gate valve, 5- descaling agent pumping pipe, 6- pressure gauge, 7- water inlet pipe, 8- support seat, 9 -Plywood, 10-recharge pipe, 11-filter pipe, 12-geothermal pump, 13-water pumping pipe, 14-geothermal well, 15-exhaust device.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the azimuth or positional relationship of the terms "on", "middle", "outside", "inside" and "around" is only for the convenience of describing the present invention and simplifying the description, rather than An indication or implication that the referred component or element must have a particular orientation, be constructed and operate in a particular orientation, is not to be construed as a limitation of the invention.

Please refer to FIG. 1 , the present invention is a pump-free descaling device for geothermal heat reservoirs and conveying pipelines, comprising a foundation surface 1 and a geothermal well 14. The geothermal well 14 is divided into a production well and a recharge well, and the production well and The structure of the recharge well is the same, a geothermal well 14 is installed on the foundation surface 1, a part of the geothermal well 14 is located on the upper side of the foundation surface 1, a splint 9 is fixedly connected to the upper end surface of the geothermal well 14, and a support base 8 is fixedly connected to the upper surface of the splint 9, A refilling pipe 10 and a pumping pipe 13 are installed in the support base 8, the lower ends of the refilling pipe 10 and the pumping pipe 13 are located inside the geothermal well 14, the upper end of the pumping pipe 13 is connected with the outlet pipe 3, and the upper end of the refilling pipe 10 is also connected There is a water inlet pipe 7; in the above structure, the geothermal well 14 can be used as both a production well and a recharge well, and the functions of the two can be interchanged.

Wherein, an exhaust device 15 is installed on the upper surface of the support base 8 , and the exhaust device 15 communicates with the geothermal well 14 ; in the above structure, the exhaust device 15 can discharge the gas in the geothermal well 14 .

The pressure gauge 6, the descaling agent pumping pipe 5 and the gate valve 4 are installed on the peripheral sides of the water outlet pipe 3 and the water inlet pipe 7. The descaling agent pumping pipe 5 is located between the pressure measuring gauge 6 and the gate valve 4. The gate valve 4 is located on the side close to the geothermal well 14; in the above 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.

The gate valve 4 is also installed on the peripheral side of the descaling agent pumping pipe 5 so as to control the flow rate per unit of the descaling agent pumping pipe 5 .

Among them, one end of the water outlet pipe 3 is fixedly connected with a sand removal, extraction heat exchange device 2, so as to facilitate the extraction, heat exchange, sand removal and other operations of the return water.

A geothermal pump 12 is also installed on the lower end surface of the water pumping pipe 13. The function of the geothermal pump 12 is to realize the transfer of low-grade heat energy to high-grade heat energy by inputting a small amount of high-grade energy in shallow terrestrial layers.

The geothermal well 14 is provided with a plurality of water filtering pipes 11 on the peripheral side. The water filtering pipes 11 are located at the lower end of the geothermal well 14 , and the groundwater can enter the bottom of the geothermal well 14 through the water filtering pipes 11 .

The present invention relates to a method for using a geothermal heat reservoir and a pump-free descaling device for conveying pipelines, comprising the following steps:

Step 1: Under the condition that the device is free of scale, pump water back to the mining well and the recharge well in the geothermal well 14, and the well water passes through the water pumping pipe 13 and the water outlet pipe 3 in turn, and then calculate the water pumping pipe 13 and the water outlet pipe per unit time. 3 water output, so as to obtain the initial water output per unit time of the device;

Step 2: When the scale of the device accumulates, the pumped well water is passed through the sand removal, extraction and heat exchange device 2, and the operations of extraction, heat exchange and sand removal are carried out, and then the well water is passed through the water inlet pipe 7 and the recharge pipe 10 in turn. Recharge into the mining well, and add the descaling agent to the water inlet pipe 7 through the descaling agent pumping pipe 5 at the same time of recharging. In the pump body section and the carbonate thermal reservoir section at the bottom of the production well, the descaling agent chemically reacts with the fouling site to generate water-soluble gas and chemically friendly components, and the well water enters the bottom of the production well or discharges the well outside.

Step 3: After reacting for a period of time, pump water back up the production well again and continue to pump the descaling agent, and compare the descaling effect of the geothermal reservoir at the bottom of the mining well and the water inlet pipe 7 and other pipelines according to the detection of water output , and then continue to pump water back up;

Step 4: After removing slag and sand, the back-raised water is recharged to the mining well, and the descaling agent is pumped into the mining well. After reacting for a period of time, it is raised again to remove the scale of the conveying pipeline. After that, inject into the recharge well and pump the descaling agent at the same time, which are mutually back-lifting, and this is repeated until the water output reaches the initial value or is close to the initial value, then the descaling is successful.

It should be noted that the device needs to use a pump during the pumping process. Since the depths of the geothermal wells 14 are different, the output power of the pump used is also different, which is subject to the actual use.

It needs to be further explained that, when pumping and returning, the openings of each gate valve 4 should be opened to the most consistent.

In the description of this specification, description with reference to the terms "one embodiment," "example," "specific example," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the present invention. in one embodiment or example. In this specification, schematic representations of the above terms 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 above-disclosed preferred embodiments of the present invention are provided only to help illustrate the present invention. The preferred embodiments do not set forth all the details and do not limit the invention to mere embodiments. Obviously, many modifications and variations are possible in light of the content of this specification. These embodiments are selected and described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is to be limited only by the claims and their full scope and equivalents.

Claims (9)

1. a geothermal heat reservoir and a conveying pipeline do not lift a pump descaling device, comprising a foundation surface (1) and a geothermal well (14), characterized in that: The geothermal well (14) is divided into a production well and a recharge well, the production well and the recharge well have the same structure, the ground surface (1) is provided with a geothermal well (14), and the geothermal well (14) has the same structure. A part is located on the upper side of the foundation surface (1). 2. A kind of geothermal heat reservoir and conveying pipeline without pump descaling device according to claim 1, characterized in that, the upper end face of the geothermal well (14) is fixedly connected with a splint (9), and the splint ( 9) A support seat (8) is fixedly connected to the upper surface, and a refill pipe (10) and a water pumping pipe (13) are installed in the support seat (8), and the refill pipe (10) and the water pumping pipe (13) The lower end of the water pump is located inside the geothermal well (14), the upper end of the suction pipe (13) is connected with a water outlet pipe (3), and the upper end of the recharge pipe (10) is also connected with a water inlet pipe (7). 3 . The pump-free descaling device according to claim 2 , characterized in that an exhaust device ( 15 ) is installed on the upper surface of the support seat ( 8 ), and the exhaust device ( 15 ) is installed on the upper surface of the support seat ( 8 ). The gas device (15) communicates with the geothermal well (14). 4. A kind of geothermal heat reservoir and conveying pipeline without pump descaling device according to claim 2, it is characterized in that, the peripheral side surface of described water outlet pipe (3) and water inlet pipe (7) are all installed with pressure measuring Table (6), descaling agent pumping pipe (5) and gate valve (4), the descaling agent pumping pipe (5) is located between the pressure gauge (6) and the gate valve (4), the gate valve ( 4) Located on the side close to the geothermal well (14). 5. A kind of geothermal heat reservoir and conveying pipeline without pump descaling device according to claim 4, characterized in that a gate valve (4) is also installed on the peripheral side of the descaling agent pumping pipe (5) . 6. A kind of geothermal heat reservoir and conveying pipeline without pump descaling device according to claim 2, characterized in that, one end of the water outlet pipe (3) is fixedly connected with a sand removal, extraction heat exchange device (2) ). 7 . The pump-free descaling device for geothermal heat reservoirs and conveying pipelines according to claim 2 , wherein a geothermal pump ( 12 ) is also installed on the lower end face of the water pumping pipe ( 13 ). 8 . 8. A pump-free descaling device for a geothermal heat reservoir and a conveying pipeline according to claim 1, characterized in that a plurality of water filter pipes (11) are opened on the peripheral side of the geothermal well (14), and the The water filter pipe (11) is located at the lower end of the geothermal well (14). 9. The method for using a geothermal thermal reservoir and a pump-free descaling device for conveying pipelines as described in any one of claims 1-7, wherein the method comprises the following steps: Step 1: Under the condition that the device is free of scale, the production wells and the recharge wells in the geothermal well (14) are pumped and raised, and the well water passes through the pumping pipe (13) and the water outlet pipe (3) in turn, and then calculates the unit time The water output of the water pumping pipe (13) and the water outlet pipe (3), so as to obtain the initial water output per unit time of the device; Step 2: When the scale is accumulated in the device, the pumped well water is passed through the sand removal, extraction and heat exchange device (2), and the operations of extraction, heat exchange and sand removal are carried out, and then the well water is passed through the water inlet pipe (7) and The recharge pipe (10) is recharged into the mining well, and the descaling agent is added to the water inlet pipe (7) through the descaling agent pumping pipe (5) at the same time of recharging, and the descaling agent enters the mining well with the well water to remove scale With the migration of well water, the agent successively reaches the pump body section and the carbonate salt thermal reservoir section at the bottom of the production well. As the well water enters the bottom of the production well or drains out of the well. Step 3: After reacting for a period of time, pump water back up the production well again and continue to pump the descaling agent. According to the detection and comparison of the water output, the removal of the geothermal reservoir at the bottom of the production well and the pipelines such as the water inlet pipe (7) is compared. scale effect, and then continue to pump water back up; Step 4: After removing slag and sand, the back-raised water is recharged to the mining well, and the descaling agent is pumped into the mining well. After reacting for a period of time, it is raised again to remove the scale of the conveying pipeline. After the removal of slag and sand After that, inject into the recharge well and pump the descaling agent at the same time, which are mutually back-lifting, and repeat this until the water output reaches the initial value or is close to the initial value, then the descaling is successful.

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