CN110567176A - method for developing geothermal energy by using old well - Google Patents
method for developing geothermal energy by using old well Download PDFInfo
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- CN110567176A CN110567176A CN201910856031.XA CN201910856031A CN110567176A CN 110567176 A CN110567176 A CN 110567176A CN 201910856031 A CN201910856031 A CN 201910856031A CN 110567176 A CN110567176 A CN 110567176A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 238
- 238000010438 heat treatment Methods 0.000 claims abstract description 213
- 238000005086 pumping Methods 0.000 claims abstract description 44
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 239000003129 oil well Substances 0.000 claims abstract description 23
- 238000005338 heat storage Methods 0.000 claims abstract description 12
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 30
- 239000002253 acid Substances 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 9
- 229920000742 Cotton Polymers 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000002407 reforming Methods 0.000 claims description 5
- 238000010248 power generation Methods 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 10
- 239000002352 surface water Substances 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 description 8
- 230000002035 prolonged effect Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T2010/50—Component parts, details or accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T2010/50—Component parts, details or accessories
- F24T2010/56—Control arrangements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Hydrology & Water Resources (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention belongs to the technical field of geothermal energy development, in particular to a method for developing geothermal energy by using an old well, wherein an oil well used in the method comprises a pumping well and a recharging well, a pumping pump is arranged in the pumping well, a heat exchanger is arranged at the outlet of the pumping well, the pumping pump is connected with the heat exchanger, a water outlet pipe is fixed at the bottom end of the heat exchanger, the other end of the water outlet pipe is communicated with the recharging well, the other end of the water outlet pipe, which is far away from the heat exchanger, is connected with a hydroelectric generation mechanism, a water collecting tank is fixed in the recharging well, a heating pipe is fixed at the bottom end of the water collecting tank; the invention uses the hydroelectric generation mechanism and the heating resistor, and utilizes the heating resistor to heat the geothermal tail water, so that the geothermal tail water finally carries a large amount of heat energy to be back-filled into a surface water layer, thereby increasing the heat storage of the pumping well and prolonging the service life of the pumping well.
Description
Technical Field
The invention belongs to the technical field of geothermal energy development, and particularly relates to a method for developing geothermal energy by using an old well.
Background
Geothermal energy is natural heat energy extracted from the earth's crust, which comes from lava rock inside the earth and exists in the form of heat, which is energy that causes volcanic eruptions and earthquakes. The temperature inside the earth is as high as 7000 c, while at depths of 80 to 100 km, the temperature drops to 650 to 1200 c. Through the flow of groundwater and the gushing of lava to the crust 1 to 5 km from the ground, the heat is transferred closer to the ground. The hot lava heats up the nearby ground water, which eventually seeps out of the ground. The simplest and most cost-effective way to use geothermal energy is to take these sources directly and extract their energy.
The used geothermal tail water is usually very low in temperature, and if the geothermal tail water is directly led into a recharging well, particularly in cold winter, the low-temperature tail water can easily cause the reduction of heat storage of a pumping well, so that the waste of heat energy is caused, the geothermal system is easily unbalanced due to too much recharging, and the pumping well can not pump hot water any more.
disclosure of Invention
in order to make up for the defects of the prior art, the method for developing geothermal energy by using the old well provided by the invention uses the hydroelectric generation mechanism and the heating pipe, after the heat in geothermal water is utilized, the potential energy of the geothermal tail water is changed into electric energy by using the height difference of two ends of the water outlet pipe through the hydroelectric generation mechanism, the electric energy is used for heating the heating resistor, and the geothermal tail water is heated when passing through the heating resistor, so that the geothermal tail water finally carries a large amount of heat energy to be pumped back to the surface water layer, the heat storage of the pumping well is increased, and the service life of the pumping well is prolonged.
the technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a method for developing geothermal energy by using an old well, which comprises the following steps:
S1: selecting the position of an old oil well, and reforming the old oil well by using a perforation method, so that the reformed oil well is used for extracting geothermal water and recharging geothermal tail water respectively;
s2: extracting geothermal water from the oil well reformed in the S1, and performing heat exchange by using a heat exchanger and the geothermal water to utilize the heat of the geothermal water;
S3: allowing the geothermal tail water used in the step S2 to flow through the heating pipe, and heating the geothermal tail water by using the heating pipe, so that the temperature of the geothermal tail water is increased, and the geothermal heat storage is improved;
The oil well used in the S2 process comprises a pumping well and a recharging well, a pumping pump is arranged in the pumping well, a heat exchanger is arranged at an outlet of the pumping well, the pumping pump is connected with the heat exchanger, a water outlet pipe is fixed at the bottom end of the heat exchanger, the other end of the water outlet pipe is communicated with the recharging well, the other end, far away from the heat exchanger, of the water outlet pipe is connected with a hydroelectric generation mechanism, a water collection tank is fixed in the recharging well, heating pipes are fixed at the bottom end of the water collection tank, heating resistors are fixed on the inner wall of the heating pipes, the heating pipes are connected with the hydroelectric generation mechanism, a controller is arranged in the recharging well and used for controlling the hydroelectric generation mechanism to work, when the hydraulic generating mechanism works, along with the continuous development of geothermal development and utilization, the number of the pumping wells and the pumping amount are increased year by, in order to solve the problem, a recharging well is usually required to be arranged independently, the cost for building and maintaining the recharging well is high, the used geothermal tail water is usually low in temperature, if the geothermal tail water is directly led into the recharging well, particularly in cold winter, the low-temperature tail water is easy to cause the reduction of geothermal heat storage, so that the waste of heat energy is caused, if the recharging is excessive, a geothermal system is easy to unbalance, so that the pumping well cannot pump the hot water, therefore, the old well can be used by reforming the old well, the building cost of the recharging well is reduced, when in use, the old well is perforated by using a perforation technology, so that the oil well enters an underground constant-temperature aquifer, then the geothermal water is pumped out of the underground constant-temperature aquifer by using a water pumping pump, the heat exchange is carried out between the pumped geothermal tail water and the heat exchanger, thereby utilizing the heat in the geothermal tail water, the used geothermal tail water flows to the recharging well from the water outlet pipe, the geothermal tail water inevitably passes through the hydraulic power generation mechanism in the moving process of the geothermal tail water, the hydraulic power generation mechanism comprises a hydraulic turbine, a generator and other structures, when the geothermal tail water flows to the recharging well from the water pumping well, the geothermal tail water converts potential energy contained in the geothermal tail water into kinetic energy of the hydraulic turbine, then the hydraulic turbine is used as motive power to push the generator to generate electric energy, the electric energy generated by the hydraulic power generation mechanism is stored in a storage battery, then the storage battery utilizes the electric energy to heat a heating resistor, after the geothermal tail water flows into a heating pipe from a water outlet pipe, the heating resistor can heat the geothermal tail water, the temperature of the geothermal tail water is increased, the thermal energy in the geothermal tail water is increased, and the heated geothermal tail water enters the surface water body above the underground constant temperature aquifer through the, the geothermal tail water pumping device can utilize waste oil wells through the arrangement of the pumping well and the recharging well, saves cost, simultaneously utilizes the geothermal tail water to generate electricity, heats the electricity by the generated electricity and reacts on the geothermal tail water, improves the temperature of the geothermal tail water, increases the heat energy of the geothermal tail water, and can improve the water level and the heat storage of the pumping well, thereby prolonging the service life of the pumping well and being beneficial to the continuous development of geothermal energy.
Preferably, the heating pipe is of a spiral structure, the inner wall of the heating resistor is provided with semicircular bulges, when the heating pipe works, because the flow rate of water is high, the specific heat capacity of water is large, the heating resistor is difficult to heat the geothermal tail water quickly, so that the geothermal tail water is heated unevenly, the heat energy of the heating resistor cannot be fully utilized, and heat loss is caused, and the semicircular bulges are arranged on the inner wall of the heating resistor, when the geothermal tail water flows through the heating pipe, the semicircular bulges on the heating resistor can block the geothermal tail water, so that the flow direction of the geothermal tail water is changed, on one hand, the geothermal tail water generates turbulent flow in the heating pipe, so that the geothermal tail water is better contacted with the heating resistor, the geothermal tail water can be heated more uniformly, on the other hand, when the geothermal tail water impacts the bulges, the speed can be reduced, and the time for the geothermal tail water to flow through the heating pipe is, the geothermal tail water heating device can be heated more fully by the heating resistor, the temperature of the geothermal tail water is improved, the heat energy of the geothermal tail water can be increased more, and therefore the geothermal energy storage is improved.
preferably, the outer wall of the heating pipe is provided with a heat insulation layer made of heat insulation cotton material, the outer side of the heat insulation cotton material is coated with waterproof paint, when in work, the air humidity in the recharging well is high, the heating resistor can enable the heating pipe to generate heat when in work, the outer wall of the heating pipe is in contact with the air, on one hand, the heat on the heating pipe can be dissipated into the air, the loss of heat energy is caused, the heating efficiency is reduced, on the other hand, the moist air can cause the outer wall of the heating pipe to be rusted, the service life of the heating pipe is reduced, the heat insulation cotton can reduce or even isolate the heat loss on the heating pipe, the heat energy is saved, the heating efficiency of the heating resistor to the geothermal tail water is improved, the waterproof coating can isolate the contact between the heating pipe and air, avoid the occurrence of the corrosion phenomenon of the heating pipe, prolong the service life of the heating pipe and directly prolong the service life of the recharge well.
Preferably, more than two heating sheets are arranged in the heating pipe, each heating sheet is of a spiral structure and has flexibility, the heating sheets are connected with the heating resistors, when the heating pipe works, when geothermal tail water passes through the heating pipe, the geothermal tail water can be heated only by contacting with the inner wall of the heating resistor, so that the heating degree of the middle part of the geothermal tail water is not high, and the geothermal tail water is not uniformly heated, the arranged heating sheets are connected with the heating resistors, when the geothermal tail water flows through the heating pipe, the heating sheets can heat the middle part of the geothermal tail water, so that the geothermal tail water is heated more uniformly, the temperature of the geothermal tail water is higher after the geothermal tail water flows through the heating pipe, more heat energy is carried, and therefore geothermal energy storage can be increased, meanwhile, the heating sheets have flexibility, when the geothermal tail water impacts the heating sheets, the heating sheets can form rebound impact on the geothermal tail water, so that the geothermal tail water is fully contacted with the heating sheets, the contact probability of the geothermal tail water and the heating sheet is increased, and the heating efficiency of the geothermal tail water can be improved.
Preferably, the heating plate is in a wave shape, the distance between wave crests of adjacent waves is 10-15 cm, during operation, the flow speed of geothermal tail water is too fast, the heating degree of the geothermal tail water passing through the heating pipe is not enough, heat energy on the heating resistor and the heating plate can be wasted, the wave-shaped heating plate can be arranged, on one hand, the flowing of the geothermal tail water can be hindered, the geothermal tail water can move irregularly in the heating pipe, the geothermal tail water is fully contacted with the heating plate, the heating efficiency of the geothermal tail water is improved, the distance between the wave crests of the adjacent waves is 10-15 cm, the interference effect of the heating plate on the geothermal tail water is the best, on the other hand, the wave-shaped heating plate can increase the surface area of the heating plate, the contact area of the heating plate and the geothermal tail water is higher, and the heating efficiency of the geothermal tail water is improved.
Preferably, a temperature sensor is arranged in the heating pipe, an acid tank is fixed in the recharging well, acetic acid is filled in the acid tank, a tank plug is arranged at the bottom end of the acid tank, an iron block is fixed at the bottom end of the tank plug, a floating body is connected to the top end of the tank plug, an electromagnet is fixed at the bottom end of the acid tank, the electromagnet and the temperature sensor are both connected with the controller, when the heating pipe works for a long time, organic substances in geothermal tail water can remain on the heating plate to form scale when the heating pipe works for a long time, so that the heating efficiency of the heating plate is influenced, the temperature sensor can measure the temperature of the geothermal tail water in the heating pipe, the temperature of the geothermal tail water is reduced, the heating degree of the geothermal tail water is insufficient, the scale can be formed on the surface of the heating plate possibly, the heating efficiency of the heating plate is influenced, the acetic acid is filled in the acid tank, make controller control electro-magnet work, the electro-magnet adsorbs the iron plate, make the jar stopper descend, the side makes the acetic acid in the sour jar fall and flow in the heating tube, wash the heating plate in the heating tube, when wasing, acetic acid can react with the incrustation scale, the incrustation scale finally disappears, wash the completion back, the electro-magnet is closed to the controller, the body can come-up this moment, it rises and plugs up the sour jar to drive the jar stopper, make acetic acid no longer pour, after wasing, the surface of heating plate is cleaner, the heating efficiency of magnetite heating plate is higher, wash the life who has prolonged the heating plate, the heating efficiency of geothermol tail water has also been improved.
the invention has the following beneficial effects:
1. The invention relates to a method for developing geothermal energy by using an old well, which uses a hydroelectric generation mechanism and a heating resistor, wherein the hydroelectric generation mechanism generates electric energy after geothermal tail water passes through the hydroelectric generation mechanism, the generated electric energy heats the heating resistor, and the heating resistor can heat the geothermal tail water when the geothermal tail water passes through a heating pipe, so that the temperature of the geothermal tail water is increased, and the situation of reducing the heat storage of a pumping well is avoided.
2. The method for developing geothermal energy by using the old well provided by the invention has the advantages that the old well is used for reconstructing the geothermal well, so that the cost is saved, and the scrapped assets are reused.
3. According to the method for developing geothermal energy by using the old well, the geothermal tail water can automatically flow to the recharging well through the arrangement of the water outlet pipe, extra power is not needed, energy is saved, and meanwhile energy can be generated.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of the operation of the pumping well and the recharge well of the present invention;
FIG. 3 is a cross-sectional view taken at A in FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 3 at B;
FIG. 5 is a three-dimensional view of a heating tube;
FIG. 6 is a three-dimensional view of a heat patch;
in the figure: the device comprises a pumping well 1, a recharging well 2, a water pump 3, a heat exchanger 4, a hydroelectric generation mechanism 5, a water collecting tank 6, a heating pipe 7, a heating resistor 8, a semicircular bulge 9, a heat insulation layer 10, a heating sheet 11, an acid tank 12, a tank plug 13, an iron block 14, a floating body 15 and an electromagnet 16.
Detailed Description
in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 6, a method for exploiting geothermal energy from an old well according to the present invention comprises the steps of:
s1: selecting the position of an old oil well, and reforming the old oil well by using a perforation method, so that the reformed oil well is used for extracting geothermal water and recharging geothermal tail water respectively;
S2: extracting geothermal water from the oil well reformed in the S1, and performing heat exchange by using a heat exchanger and the geothermal water to utilize the heat of the geothermal water;
S3: allowing the geothermal tail water used in the step S2 to flow through the heating pipe, and heating the geothermal tail water by using the heating pipe, so that the temperature of the geothermal tail water is increased, and the geothermal heat storage is improved;
wherein, the oil well used in the invention S2 comprises a pumping well 1 and a recharging well 2, a pumping pump 3 is arranged in the pumping well 1, a heat exchanger 4 is arranged at the outlet of the pumping well 1, the pumping pump 3 is connected with the heat exchanger 4, a water outlet pipe is fixed at the bottom end of the heat exchanger 4, the other end of the water outlet pipe is communicated with the recharging well 2, the other end of the water outlet pipe, which is far away from the heat exchanger 4, is connected with a hydroelectric generation mechanism 5, a water collection tank 6 is fixed in the recharging well 2, a heating pipe 7 is fixed at the bottom end of the water collection tank 6, a heating resistor 8 is fixed on the inner wall of the heating pipe 7, the heating pipe 7 is connected with the hydroelectric generation mechanism 5, a controller is arranged in the recharging well 2 and is used for controlling the hydroelectric generation mechanism 5 to work, and the number and pumping amount of the pumping well, some places reach or even exceed the limit of water pumping amount limited by resource evaluation, a large amount of water is pumped without recharging, the water level is inevitably continuously reduced, the service life of the well is reduced, the continuous development of geothermal energy is not facilitated, in order to solve the problem, a recharging well is usually required to be independently arranged, the cost for building and maintaining the recharging well is higher, the temperature of used geothermal tail water is usually very low, if the geothermal tail water is directly led into the recharging well, particularly in cold winter, the low-temperature tail water is easy to cause the reduction of geothermal heat storage, so that the waste of heat energy is caused, if the recharging is excessive, a geothermal system is easy to be unbalanced, so that the pumping well cannot pump hot water, therefore, the old well can utilize waste materials, the building cost of the recharging well is reduced, when in use, the old oil well is perforated by utilizing a perforation technology, so that the oil well enters an underground constant-temperature aquifer, then, the water pump 3 is used for pumping geothermal water from the underground constant-temperature aquifer, the pumped geothermal water exchanges heat with the heat exchanger 4, so that the heat in the geothermal water is utilized, the used geothermal tail water flows to the recharging well 2 from the water outlet pipe, the geothermal tail water inevitably passes through the hydroelectric generation mechanism 5 in the moving process of the geothermal tail water, the hydroelectric generation mechanism 5 comprises a water turbine, a generator and other structures, when the geothermal tail water flows to the recharging well 2 from the water pumping well 1, the geothermal tail water converts potential energy contained in the geothermal tail water into kinetic energy of the water turbine, the water turbine is used as motive power to drive the generator to generate electric energy, the electric energy generated by the hydroelectric generation mechanism 5 is stored in a storage battery, the storage battery utilizes the electric energy to heat the heating resistor 8, after the geothermal tail water flows into the heating pipe 7 from the water outlet pipe, the heating resistor 8 can heat the geothermal tail water, the geothermal tail water temperature is improved, the heat energy in the geothermal tail water is increased, the heated geothermal tail water enters the surface water body above the underground constant-temperature aquifer through the recharging well 2, and recharging of the geothermal tail water is realized.
As a specific embodiment of the present invention, the heating pipe 7 is a spiral structure, the inner wall of the heating resistor 8 is provided with a semicircular protrusion 9, when in operation, the heating resistor 8 is difficult to heat the geothermal tail water rapidly due to the fast flow rate of water and the large specific heat capacity of water, so that the geothermal tail water is heated unevenly, and thus the heat energy of the heating resistor 8 cannot be fully utilized, and heat loss is caused, while the inner wall of the heating resistor 8 is provided with a semicircular protrusion 9, when the geothermal tail water flows through the heating pipe 7, the semicircular protrusion 9 on the heating resistor 8 can block the geothermal tail water, so that the flow direction of the geothermal tail water is changed, on one hand, the geothermal tail water generates turbulent flow in the heating pipe 7, so that the geothermal tail water is better contacted with the heating resistor 8, and the geothermal tail water can be heated more uniformly, on the other hand, when the geothermal tail water impacts the protrusion, the speed can be reduced, so that the time for geothermal tail water to flow through the heating pipe 7 is increased, the geothermal tail water can be heated more sufficiently by the heating resistor 8, the temperature of the geothermal tail water is increased, the heat energy of the geothermal tail water can be increased more, and the geothermal energy storage is improved.
As a specific embodiment of the present invention, the heat-insulating layer 10 is disposed on the outer wall of the heating pipe 7, the heat-insulating layer 10 is made of heat-insulating cotton material, and waterproof paint is coated on the outer side of the heat-insulating cotton material, when the heating pipe 7 is in operation, the humidity of air in the recharging well 2 is high, and when the heating resistor 8 is in operation, the heating pipe 7 is heated, and at this time, the outer wall of the heating pipe 7 is in contact with air, on one hand, the heat on the heating pipe 7 is dissipated into the air, which results in heat loss and heating efficiency reduction, on the other hand, the outer wall of the heating pipe 7 is corroded due to the humid air, which reduces the service life of the heating pipe 7, the heat-insulating cotton can reduce or even isolate the heat dissipation on the heating pipe 7, save heat energy, improve the heating efficiency of the heating resistor 8 on the, the service life of the heating pipe 7 is prolonged, and the service life of the recharge well 2 is directly prolonged.
As a specific embodiment of the present invention, two or more heating sheets 11 are disposed in the heating pipe 7, the heating sheets 11 are of a spiral structure, the heating sheets 11 have flexibility, the heating sheets 11 are connected to the heating resistor 8, when in operation, when geothermal tail water passes through the heating pipe 7, only the geothermal tail water contacts the inner wall of the heating resistor 8 to be heated, so that the middle part of the geothermal tail water is not heated to a high degree, thereby causing the geothermal tail water to be heated unevenly, the heating sheets 11 are connected to the heating resistor 8, when geothermal tail water passes through the heating pipe 7, the heating sheets 11 can heat the middle part of geothermal tail water, so that the geothermal tail water is heated more evenly, and the geothermal tail water is heated to a higher temperature after passing through the heating pipe 7, and carries more heat energy, thereby increasing stored geothermal energy, and at the same time, the heating sheets 11 have flexibility, so that when geothermal tail water impacts the heating sheets 11, the heating plate 11 can form resilience impact on the geothermal tail water, so that the geothermal tail water is fully contacted with the heating plate 11, the contact probability of the geothermal tail water and the heating plate 11 is increased, and the heating efficiency of the geothermal tail water can be improved.
As a specific embodiment of the invention, the heating sheet 11 is arranged in a wave shape, the distance between wave crests of adjacent waves is 10-15 cm, and when the heating sheet works, because the flow speed of the geothermal tail water is too high, the heating degree of the geothermal tail water after passing through the heating pipe 7 is not enough, the heat energy on the heating resistor 8 and the heating sheet 11 is wasted, therefore, the wave-shaped heating sheets 11 can hinder the flow of the geothermal tail water on one hand, so that the geothermal tail water moves irregularly in the heating pipe 7, thereby the geothermal tail water is fully contacted with the heating sheet 11, the heating efficiency of the geothermal tail water is improved, the distance between wave crests of adjacent waves is 10-15 cm, so that the interference effect of the heating plate 11 to the geothermal tail water is the best, on the other hand, the wave-shaped heating plate 11 can increase the surface area of the heating plate 11, the contact area between the heating plate 11 and the geothermal tail water is higher, and the heating efficiency of the geothermal tail water is further improved.
as a specific embodiment of the invention, a temperature sensor is arranged in the heating pipe 7, an acid tank 12 is fixed in the recharging well 2, acetic acid is filled in the acid tank 12, a tank plug 13 is arranged at the bottom end of the acid tank 12, an iron block 14 is fixed at the bottom end of the tank plug 13, a floating body 15 is connected at the top end of the tank plug 13, an electromagnet 16 is fixed at the bottom end of the acid tank 12, the electromagnet 16 and the temperature sensor are both connected with a controller, when the acid tank works for a long time, organic substances in geothermal tail water can remain on the heating sheet 11 to form scale so as to influence the heating efficiency of the heating sheet 11, the temperature sensor can measure the temperature of the geothermal tail water in the heating pipe 7, the temperature of the geothermal tail water is reduced, the heating degree of the geothermal tail water is not enough, probably because scale is formed on the surface of the heating sheet 11 and the heating efficiency of the heating sheet 11 is influenced, the acetic, after the temperature sensor in heating pipe 7 senses the temperature decline of geothermol power tail water, send signal for the controller, make controller control electro-magnet 16 work, electro-magnet 16 adsorbs iron plate 14, make jar stopper 13 descend, the side makes the acetic acid in the acid tank 12 fall and flow in heating pipe 7, wash heating plate 11 in heating pipe 7, during the washing, acetic acid can react with the incrustation scale, the incrustation scale is finally eliminated, after the washing is accomplished, the controller closes electro-magnet 16, body 15 can the come-up this moment, it rises and plugs up acid tank 12 to drive jar stopper 13, make acetic acid no longer pour, after wasing, the surface of heating plate 11 is cleaner, the heating efficiency of magnetite heating plate 11 is higher, wash the life who has prolonged heating plate 11, the heating efficiency of geothermol power tail water has also been improved.
When the geothermal energy recovery system works, along with the continuous development of geothermal development and utilization, the number and the water pumping quantity of geothermal wells are increased year by year, some places reach or even exceed the limit of water pumping quantity limited by resource evaluation, a large amount of water pumping is carried out without recharging, the water level is inevitably reduced continuously, the service life of the wells is reduced, the continuous development of geothermal energy is not facilitated, in order to solve the problem, the recharging wells are usually required to be arranged independently, the construction and maintenance cost is high, the used geothermal tail water is usually low in temperature, if the geothermal tail water is directly led into the recharging wells, particularly in cold winter, the low-temperature tail water is easy to cause the reduction of the heat storage of the geothermal wells, so that the waste of heat energy is caused, if the recharging is too much, a geothermal system is easy to unbalance, the geothermal fields can not generate energy, therefore, the old wells can utilize waste by reforming the old wells, the construction cost of the recharging wells is reduced, and when the geothermal energy recovery system, the perforating technology is utilized to perforate the old oil well, so that the oil well enters an underground constant-temperature aquifer, then the water suction pump 3 is utilized to pump geothermal water out of the underground constant-temperature aquifer, the pumped geothermal water exchanges heat with the heat exchanger 4, so that the used geothermal tail water flows to the recharging well 2 from the water outlet pipe by utilizing the heat in the geothermal water, when the geothermal tail water passes through the hydroelectric generation mechanism 5, the hydroelectric generation mechanism 5 can generate electric energy, the electric energy generated by the hydroelectric generation mechanism 5 is stored in the storage battery, then the storage battery utilizes the electric energy to heat the heating resistor 8, after the geothermal tail water flows into the heating pipe 7 from the water outlet pipe, the heating resistor 8 can heat the geothermal tail water, so that the temperature of the geothermal tail water is increased, the heat energy in the geothermal tail water is increased, and the heated geothermal tail water enters the surface water body above the underground constant-temperature aquifer through the recharging well 2, the geothermal tail water recharging method has the advantages that the pumping well 1 and the recharging well 2 are arranged, waste oil wells can be utilized, cost is saved, meanwhile, geothermal tail water is used for generating electricity, the generated electricity is used for heating and reacting on the geothermal tail water, the temperature of the geothermal tail water is increased, the heat energy of the geothermal tail water is increased, the recharged geothermal tail water can improve the water level and the heat storage of the geothermal well, the service life of the geothermal well is prolonged, and the continuous development of geothermal is facilitated.
the foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. a method of exploiting geothermal energy from an old well, comprising the steps of:
S1: selecting the position of an old oil well, and reforming the old oil well by using a perforation method, so that the reformed oil well is used for extracting geothermal water and recharging geothermal tail water respectively;
s2: extracting geothermal water from the oil well reformed in the S1, and performing heat exchange by using a heat exchanger and the geothermal water to utilize the heat of the geothermal water;
S3: allowing the geothermal tail water used in the step S2 to flow through the heating pipe, and heating the geothermal tail water by using the heating pipe, so that the temperature of the geothermal tail water is increased, and the geothermal heat storage is improved;
Wherein, the oil well used by the S2 comprises a pumping well (1) and a recharging well (2), a water suction pump (3) is arranged in the water suction well (1), a heat exchanger (4) is arranged at the outlet of the water suction well (1), the water suction pump (3) is connected with the heat exchanger (4), a water outlet pipe is fixed at the bottom end of the heat exchanger (4), the other end of the water outlet pipe is communicated with the recharging well (2), the other end of the water outlet pipe, which is far away from the heat exchanger (4), is connected with a hydroelectric generation mechanism (5), a water collecting tank (6) is fixed in the recharging well (2), a heating pipe (7) is fixed at the bottom end of the water collecting tank (6), a heating resistor (8) is fixed on the inner wall of the heating pipe (7), the heating pipe (7) is connected with the hydroelectric generation mechanism (5), and a controller is arranged in the recharge well (2) and is used for controlling the hydraulic power generation mechanism (5) to work.
2. A method of exploiting geothermal energy from old wells according to claim 1, characterised in that: the heating pipe (7) is of a spiral structure, and the inner wall of the heating resistor (8) is provided with a semicircular bulge (9).
3. a method of exploiting geothermal energy from old wells according to claim 2, characterised in that: the outer wall of the heating pipe (7) is provided with a heat insulation layer (10), the heat insulation layer (10) is made of heat insulation cotton materials, and waterproof paint is coated on the outer side of the heat insulation cotton materials.
4. A method of exploiting geothermal energy from old wells according to claim 1, characterised in that: be equipped with heating plate (11) more than two in heating pipe (7), heating plate (11) are helical structure, and heating plate (11) have the pliability, and heating plate (11) are connected with heating resistor (8).
5. A method of exploiting geothermal energy from old wells according to claim 4, characterised in that: the heating plates (11) are arranged in a wave shape, and the distance between wave crests of adjacent waves is 10-15 cm.
6. A method of exploiting geothermal energy from old wells according to claim 1, characterised in that: be equipped with temperature sensor in heating pipe (7), recharge well (2) internal fixation has acid tank (12), is equipped with acetic acid in acid tank (12), and acid tank (12) bottom is equipped with jar stopper (13), and jar stopper (13) bottom mounting has iron plate (14), and jar stopper (13) top is connected with body (15), and acid tank (12) bottom mounting has electro-magnet (16), and electro-magnet (16), temperature sensor all are connected with the controller.
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| CN111609576A (en) * | 2020-06-12 | 2020-09-01 | 东北石油大学 | Device for realizing synchronous exploitation and recharge of geothermal water by utilizing waste oil well |
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