CN108869207A - Shaft type heat exchange closed cycle underground thermoelectric heat generation system and method - Google Patents
Shaft type heat exchange closed cycle underground thermoelectric heat generation system and method Download PDFInfo
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- CN108869207A CN108869207A CN201810525008.8A CN201810525008A CN108869207A CN 108869207 A CN108869207 A CN 108869207A CN 201810525008 A CN201810525008 A CN 201810525008A CN 108869207 A CN108869207 A CN 108869207A
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- 230000020169 heat generation Effects 0.000 title claims abstract description 21
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- 239000012530 fluid Substances 0.000 claims abstract description 413
- 238000002347 injection Methods 0.000 claims abstract description 116
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- 238000010248 power generation Methods 0.000 claims abstract description 29
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- 238000003032 molecular docking Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
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- 230000005611 electricity Effects 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 claims description 6
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- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000005619 thermoelectricity Effects 0.000 claims description 2
- 238000013021 overheating Methods 0.000 claims 2
- 239000004020 conductor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
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- 239000004568 cement Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
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- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003287 bathing Methods 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
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- 238000005057 refrigeration Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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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
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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Abstract
The present invention relates to a kind of shaft type heat exchange closed cycle underground thermoelectric heat generation system and methods.System includes defeated module outside pit shaft, fluid circulation module and electric energy.Pit shaft includes casing, oil pipe, thermoelectric generation module, cold fluid injection pipe and collector tube.For oil pipe by passing through packer setting on internal surface of sleeve pipe, oil pipe bottom is equipped with penetration type oil pipe plug.Space between internal surface of sleeve pipe and thermoelectric generation module outer wall forms oil jacket annulus flow channel.Oil pipe inner space forms oil pipe flow channel.Cold fluid injection pipe is arranged in oil jacket annulus flow channel or in oil pipe flow channel.Fluid circulation module includes that cold fluid injection pipeline, cold fluid injection pump, cold fluid flow go out that pipeline, cold fluid storage container, cold fluid inflow line, hot fluid returns out fluid flow line using module, oil jacket annulus and oil pipe returns out fluid flow line.The present invention, which is able to achieve, to be taken heat power generation not fetch water, provides stable electric energy supply, and will not influence the later use of heat exchanging fluid.
Description
Technical field
The invention belongs to geothermal power generation technical fields, and in particular to a kind of shaft type heat exchange closed cycle underground thermoelectric power generation
System and method.
Background technique
Geothermal energy is a kind of renewable energy from earth depths, has the characteristics that reserves are big, clean, is sustainable,
Current extreme weather events take place frequently with the energy it is increasingly in short supply in the case where, more and more to the rational exploitation and utilizations of geothermal energy resources
It has been favored by people.Geothermal utilization be divided into directly using and geothermal power generation two major classes type, wherein directly using including bathing,
Cultivation, heating, refrigeration, plantation, cultivation etc., geothermal power generation is according to thermophore type, temperature, the difference of pressure and other characteristics
Steam type geothermal power generation and hot-water type geothermal power generation two types can be divided into.These geothermal utilization methods require to store up heat
Layer fluid carries out power generation after extracting ground again or directly utilizes, and heat reservori fluid is largely exploited and can be brought under potential stratum
The problems such as heavy, pit shaft fouling, constrains geothermal energy development and the development that utilizes to a certain extent.
With the progress of semiconductor material manufacturing technology and technique in recent years, thermoelectric power generation technology is gradually risen.The technology
It is generated electricity using the Seebeck effect principle of semiconductor material, movement-less part in entire electricity generation system will using temperature difference
Thermal energy is converted directly into electric energy.It is some studies have shown that even if only having 10 degrees Celsius of the temperature difference between thermoelectric power generation unit two sides,
In the case where thermoelectric power generation unit scale reaches hundreds of meters of length, enough electric energy can be generated.
Summary of the invention
The technical restriction of productive prospecting and existing electricity-generating method for the storage of middle Low Temperature Thermal, present invention combination thermoelectric power generation
Technology proposes a kind of shaft type heat exchange closed cycle underground thermoelectric heat generation system and method, which, which is not only able to achieve, takes
Heat power generation does not fetch water, provides stable electric energy supply, but also will not influence the later use of heat exchanging fluid.
To achieve the above object, the invention adopts the following technical scheme：
The present invention relates to a kind of shaft type heat exchange closed cycle underground thermoelectric heat generation system, which includes：Pit shaft, fluid
Defeated module outside loop module and electric energy.
Specifically, the pit shaft includes the casing, embedding for successively drilling production layer superstratum from up to down and producing layer
Enter the oil pipe being arranged in casing, the thermoelectric generation module being arranged on oil-pipe external wall, cold fluid injection pipe and collector tube；Institute
The top for stating oil pipe is concordant with the top of casing, and bottom is located at production layer superstratum and produces the intersection of layer；The oil pipe
Lower end outside by passing through packer setting on internal surface of sleeve pipe, the bottom inside of oil pipe is equipped with penetration type oil pipe plug；Institute
State thermoelectric generation module and be arranged in and pass through on the oil pipe above packer, and thermoelectric generation module by docking cable with
Defeated module is connected outside electric energy；It is logical that space between described sleeve pipe inner wall and thermoelectric generation module outer wall forms oil jacket annulus flowing
Road；The oil pipe inner space forms oil pipe flow channel.
The cold fluid injection pipe setting is in oil jacket annulus flow channel or in oil pipe flow channel；The cold fluid
The underground current divider being located within the scope of production layer superstratum is equipped in injection pipe；When cold fluid injection pipe is located at oil jacket annulus
When in flow channel, the lower end of cold fluid injection pipe stretches to the casing being located within the scope of production layer after passing through packer
In, the upper end insertion of the collector tube is mounted in penetration type oil pipe plug, and lower end stretches to the set being located within the scope of production layer
Guan Zhong is equipped with gap between bottom and pit shaft shaft bottom, and the liquid collecting tube cavity is connected with oil pipe flow channel；Work as cold flow
When body injection pipe is located in oil pipe flow channel, the lower end of cold fluid injection pipe stretches to position after passing through penetration type oil pipe plug
In the casing within the scope of production layer, the upper end of the collector tube, which is installed through, to be passed through on packer, and lower end lies in life
In casing within the scope of payzone, gap, and the liquid collecting tube cavity and oil jacket annulus stream are equipped between bottom and pit shaft shaft bottom
Dynamic channel is connected.
The fluid circulation module includes that cold fluid injection pipeline, cold fluid injection pump, cold fluid flow go out pipeline, cold flow
Body storage container, cold fluid inflow line, hot fluid returns out fluid flow line using module, oil jacket annulus and oil pipe returns out
Fluid flow line；It is opened by the upper end that cold fluid injects pipeline and cold fluid injection pipe the outlet of the cold fluid injection pump
Mouth is connected, and the entrance of cold fluid injection pump goes out pipeline by cold fluid flow and is connected with the outlet of cold fluid storage container；It is described cold
The entrance of fluid-storing container is connected with hot fluid using the outlet of module by cold fluid inflow line；The hot fluid benefit
It returns out fluid flow line by oil pipe with the entrance of module to be connected with oil pipe flow channel, hot fluid utilizes the entrance of module
Also fluid flow line is returned out by oil jacket annulus to be connected with oil jacket annulus flow channel.
Further, the pit shaft is the cell structure for drilling stratum, using setting of casing to shaft bottom cementing well mode
It realizes；Described sleeve pipe and production layer and production layer upper caldding layer are close cementing.
Further, heat-insulating material is coated on the internal surface of sleeve pipe within the scope of production layer superstratum；It is described
Heat-transfer matcrial is coated on the internal surface of sleeve pipe within the scope of production layer.
Further, the thermoelectric generation module includes the thermoelectric generator that several groups are serially connected；The thermoelectric power generation
Machine includes several groups thermoelectric power generation unit；The thermoelectric power generation unit includes a N-type semiconductor and a P-type semiconductor, phase
N-type semiconductor and P-type semiconductor are alternately arranged between adjacent thermoelectric power generation unit.
Further, described sleeve pipe, oil pipe, cold fluid injection pipe, collector tube, to pass through packer and penetration type oil pipe stifled
The cross section of head is circle；The oil pipe and casing are coaxially disposed.The cross section of the thermoelectric generation module is circular ring shape.
Further, the cold fluid injection pump and cold fluid storage container are respectively positioned on ground.
The invention further relates to a kind of thermoelectric power generation sides using above-mentioned shaft type heat exchange closed cycle underground thermoelectric heat generation system
Method,
S1, when cold fluid injection pipe is located in oil jacket annulus flow channel, this approach includes the following steps：
S11, the cold fluid being stored in cold fluid storage container go out pipeline through cold fluid flow and enter the increasing of cold fluid injection pump
After pressure, pipeline is injected by cold fluid and enters cold fluid injection pipe.
S12, when the cold fluid flow to flow downward in cold fluid injection pipe through cold fluid injection bottom of the tube underground current divider
When, under the shunting function of underground current divider, a part of cold fluid in cold fluid injection pipe is split into oil jacket annulus stream
Dynamic channel, and ground is flowed upward to along oil jacket annulus flow channel, temperature can be gradually in uphill process for the part cold fluid
It increases, is hot fluid when outflow from oil jacket annulus flow channel；Another part cold fluid in cold fluid injection pipe is cold
Continue to flow downward in fluid injection conduit, into passing through in the wellbore space of packer and penetration type oil pipe plug lower part, the portion
Divide cold fluid to increase by casing with the high-temperature geothermal fluid and reservoir progress heat exchange, temperature produced in layer, becomes cycling hot
Fluid, which is entered in oil pipe flow channel by collector tube, and flows upward to ground along oil pipe flow channel
Face.
S13, the hot fluid flowed out from oil jacket annulus flow channel return out fluid flow line by oil jacket annulus and flow into heat
Fluid utilizes module；The hot fluid flowed out from oil pipe flow channel returns out fluid flow line by oil pipe and flows into hot fluid benefit
Use module.
S14, from the hot fluid that oil jacket annulus flow channel and oil pipe flow channel flow out in hot fluid using being passed through in module
It crosses heat exchange and is returned in cold fluid storage container after utilizing by cold fluid inflow line.
The low temperature of S15, thermoelectric generation module in the high temperature fluid and oil jacket annulus flow channel in oil pipe flow channel
It is produced electricl energy under the action of temperature difference between fluid, and passes through docking cable for module defeated outside electric energy inputing power.
S2, when cold fluid injection pipe is located in oil pipe flow channel, this approach includes the following steps：
S21, the cold fluid being stored in cold fluid storage container go out pipeline through cold fluid flow and enter cold fluid injection pump
After pressurization, pipeline is injected by cold fluid and enters cold fluid injection pipe.
S22, when the cold fluid flow to flow downward in cold fluid injection pipe through cold fluid injection bottom of the tube underground current divider
When, under the shunting function of underground current divider, a part of cold fluid in cold fluid injection pipe is split logical into oil pipe flowing
Road, and ground is flowed upward to along oil pipe flow channel, part cold fluid temperature in uphill process can gradually rise, from
It is hot fluid when oil pipe flow channel flows out；Another part cold fluid in cold fluid injection pipe is in cold fluid injection pipe
In continue to flow downward, into passing through in the wellbore space of packer and penetration type oil pipe plug lower part, the part cold fluid is logical
The high-temperature geothermal fluid and reservoir crossing casing and producing in layer carry out heat exchange, and temperature increases, and become thermal fluid circulation, the portion
Hot fluid is divided to enter in oil jacket annulus flow channel by collector tube and flow upward to ground along oil jacket annulus flow channel.
S23, the hot fluid flowed out from oil jacket annulus flow channel return out fluid flow line by oil jacket annulus and flow into heat
Fluid utilizes module；The hot fluid flowed out from oil pipe flow channel returns out fluid flow line by oil pipe and flows into hot fluid benefit
Use module.
S24, from the hot fluid that oil jacket annulus flow channel and oil pipe flow channel flow out in hot fluid using being passed through in module
It crosses heat exchange and is returned in cold fluid storage container after utilizing by cold fluid inflow line.
The low temperature of S25, thermoelectric generation module in the high temperature fluid and oil pipe flow channel in oil jacket annulus flow channel
It is produced electricl energy under the action of temperature difference between fluid, and passes through docking cable for module defeated outside electric energy inputing power.
Further, the cold fluid is water, liquid carbon dioxide, any one in liquid nitrogen.
Compared to the prior art, beneficial effects of the present invention are：
(1) present invention uses shaft type heat exchange closed cycle mode to realize underground and takes heat power generation not fetch water, avoid tradition
In underground heat production process the problems such as potential stratum settlement, pit shaft fouling.
(2) present invention is real using the thermoelectric generation module for being arranged in hot water type geothermal well or High water cut abandoned well underground
Generating power downhole is showed.
(3) underground thermoelectric heat generation system of the present invention will not additionally occupy floor area, and the noiseless that works.
(4) in the present invention, the hot fluid recycled after the thermoelectric power generation of underground repeats circulation benefit after ground exchanges heat
With reduction discharge；The heat extracted after heat exchange can be used for the application such as floor heating, cultivation, bathing.
It takes heat power generation not fetch water in conclusion the present invention is not only able to achieve, stable electric energy supply is provided, but also not
It will affect the later use of heat exchanging fluid.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one central-axis type of embodiment heat exchange closed cycle underground thermoelectric heat generation system；
Fig. 2 is the I-I ' the schematic diagram of the section structure of Fig. 1；
Fig. 3 is the II-II ' the schematic diagram of the section structure of Fig. 1；
Fig. 4 is the structural schematic diagram of two central-axis type of embodiment heat exchange closed cycle underground thermoelectric heat generation system；
Fig. 5 is the III-III ' the schematic diagram of the section structure of Fig. 4；
Fig. 6 is the V-V ' the schematic diagram of the section structure of Fig. 4.
Wherein：
101, production layer, 102, production layer superstratum, 103, casing, 104, thermoelectric generation module, 105, oil pipe,
106, cold fluid injection pipe, 107, collector tube, 108, underground current divider, 109, pass through packer, 110, penetration type oil pipe it is stifled
Head, 111, shaft bottom, 112, pit shaft, 113, bottom hole cement plugged zone, 200, fluid circulation module, 201, cold fluid injection pipeline,
202, cold fluid injection pump, 203, cold fluid flow go out pipeline, 204, cold fluid storage container, 205, cold fluid inflow line,
206, hot fluid utilizes module, 207, oil jacket annulus return out fluid flow line, 208, oil pipe return out fluid flow line,
301, docking cable, 302, defeated module outside electric energy, 401, oil jacket annulus flow channel, 402, oil pipe flow channel.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing：
Embodiment one
A kind of shaft type heat exchange closed cycle underground thermoelectric heat generation system as shown in Figure 1, including：The system includes：Pit shaft
112, defeated module 302 outside fluid circulation module 200 and electric energy.
Specifically, the 101 thousands of rice of buried depth of production layer.The production layer superstratum 102 make a living payzone 101 with
The thermal insulation layers such as the sedimentary rock or soil that are covered up to earth's surface, formation temperature are in gradually decrease trend from bottom to up, lower than production
The reservoir temperature of layer 101.The pit shaft 112 includes successively drilling production layer superstratum 102 and production layer 101 from up to down
Casing 103, insertion be arranged in casing 103 oil pipe 105, be arranged on 105 outer wall of oil pipe thermoelectric generation module 104,
Cold fluid injection pipe 106 and collector tube 107.The top of the oil pipe 105 is concordant with the top of casing 103, and bottom is located at production
The intersection of layer superstratum 102 and production layer 101.The pit shaft 112 is the cell structure for drilling stratum, sequentially passes through life
Payzone superstratum 102 and production layer 101, are completed using setting of casing 103 to 1111 cementing well mode of shaft bottom.The set
Pipe 103 and production layer 101 and production layer superstratum 102 are close cementing, completely cut off with formation fluid.Cover ground on production layer
Internal surface of sleeve pipe surface in 102 range of layer applies heat-insulating material, to reduce production layer superstratum 102 and on production layer
Cover the heat transmitting between the fluid in the casing 103 in 102 range of stratum.In the casing 103 produced in 101 range of layer
The enhanced heat-transfer matcrial of coated inner wall, to increase the high-temperature geothermal fluid in production layer 101 with reservoir and in production layer
Heat transmitting between the fluid in casing 103 in 101 ranges.Shaft bottom 111 forms bottom hole cement plugged zone using grout off
113, prevent the geothermal fluid in production layer 101 from entering in pit shaft 112.105 tripping in of oil pipe produces right above layer 101, by wearing
More packer 109 is set on casing 103.The outside of the thermoelectric generation module 104 fastened on 105 outer wall of oil pipe and life
103 part of casing in 102 range of payzone superstratum forms oil jacket annulus flow channel 401.105 inner space shape of oil pipe
At oil pipe flow channel 402.Cold fluid injection pipe 106 through passing through by sealing in 401 lower going-into-well of oil jacket annulus flow channel
It is connected to every device 109 and with the wellbore space for passing through 109 lower part of packer.Cold fluid injection pipe 106 is close to pass through packer 109
Position at underground current divider 108 is installed, to enter after being shunted from part cold fluid that cold fluid injection pipe 106 injects
In oil jacket annulus flow channel 401.Penetration type oil pipe plug 110 is located at 105 bottom of oil pipe, and collector tube 107 passes through penetration type oil
Pipe plug 110 is connected with oil pipe flow channel 402.Collector tube 107 and the wellbore space below of packer 109 constitute one
Shaft type heat exchanger.In example 1, the cold fluid injection pipe 106 is arranged in oil jacket annulus flow channel 207.It is described
The underground current divider 108 being located in production 102 range of layer superstratum is equipped in cold fluid injection pipe 106.Cold fluid injection pipe
106 lower end stretches in the casing 103 being located in production 101 range of layer after passing through packer 109, the collector tube
107 upper end insertion is mounted in penetration type oil pipe plug 110, and lower end stretches to the casing being located in production 101 range of layer
In 103, gap is equipped between 112 shaft bottom of bottom and pit shaft, and 107 inner cavity of the collector tube is connected with oil pipe flow channel 402
It is logical.
Further, the fluid circulation module 200 include cold fluid injection pipeline 201, it is cold fluid injection pump 202, cold
Fluid flows out pipeline 203, cold fluid storage container 204, cold fluid inflow line 205, hot fluid and utilizes module 206, oil jacket ring
Sky returns out fluid flow line 207 and oil pipe returns out fluid flow line 208.The outlet of the cold fluid injection pump 202 passes through
Cold fluid injection pipeline 201 is connected with the upper end opening of cold fluid injection pipe 106, and the entrance of cold fluid injection pump 202 passes through cold
Fluid outflow pipeline 203 is connected with the outlet of cold fluid storage container 204；The entrance of the cold fluid storage container 204 passes through
Cold fluid inflow line 201 is connected with hot fluid using the outlet of module 206；The hot fluid utilizes the entrance of module 206
It returns out fluid flow line 208 by oil pipe to be connected with oil pipe flow channel 402, hot fluid is also logical using the entrance of module 206
It crosses oil jacket annulus and returns out fluid flow line 207 and be connected with oil jacket annulus flow channel 401.
Further, the thermoelectric generation module 104 is fastened on 105 outer wall of oil pipe, with 105 tripping in casing 103 of oil pipe
It is interior；The thermoelectric generation module 104 is connected by docking cable 301 with module 302 defeated outside electric energy, and thermoelectric generation module 104 produces
Raw electric energy is transmitted to defeated module 302 outside electric energy by docking cable 301, provides a user electricity by module 302 defeated outside electric energy
Energy.Specifically, the thermoelectric generation module 104 is connected in series by several groups thermoelectric generator.The several groups thermoelectric power generation
Machine can be 1 group, 10 groups, 100 groups, be also possible to any multiple groups.If the thermoelectric generator by several N-type semiconductors and
Dry P-type semiconductor assembles according to alternating, pairs of arrangement mode.One N-type semiconductor and a P-type semiconductor are constituted
One thermoelectric power generation unit.Several described N-type semiconductors and several P-type semiconductors can be 1,10,100,
It can be any number of.N-type semiconductor quantity and P-type semiconductor quantity are equal.
Further, the cold fluid is water, liquid carbon dioxide or liquid nitrogen.
Further, the underground current divider 108 is by the cold fluid injected from cold fluid injection pipe 6 according to certain
Volume ratio distributes a part of cold fluid and imports oil jacket annulus flow channel 401, and the importing of another part cold fluid connects therewith
What is connect is positioned across in the wellbore space of 109 lower part of packer.Certain volume ratio refers to be flowed into oil jacket annulus
The ratio between the total volume of cold fluid in the volume of cold fluid in channel 401 and ground injection cold fluid injection pipe 6, the volume
Ratio can be 0.1,0.2,0.5,0.9, be also possible between 0 to 1 any fractional value in addition to 0 and 1.
Further, as shown in Fig. 2, the cross section of the cold fluid injection pipe 106, oil pipe 105 and casing 103 is
It is round.As shown in figure 3, the collector tube 107, pass through packer 109 and penetration type oil pipe plug 110 be in cross section
It is round.The oil pipe 105 and casing 103 are coaxially disposed.The cross section of the thermoelectric generation module 104 is circular ring shape.
The working principle of the system is：
Cold fluid injection pump 202 after the cold fluid pressurization of self cooling fluid-storing container 204, is injected in the future by cold fluid
The injection of pipeline 201 is located in the cold fluid injection pipe 6 in oil jacket annulus flow channel 401.Through pressurized cold fluid along cold
When fluid injection conduit 6 flows through underground current divider 108, under the shunting function of underground current divider 108, a part of cold fluid is divided
Stream enters in oil jacket annulus flow channel 401, and flows upwards out ground along oil jacket annulus flow channel 401, and remainder is cold
Fluid is split to enter and pass through in the wellbore space of 109 lower part of packer.Cold flow into oil jacket annulus flow channel 401
Body constantly absorbs heat from surrounding formation during flowing up along oil jacket annulus flow channel 401, and temperature gradually increases,
Reach maximum temperature entering at 401 floor outlet of oil jacket annulus flow channel, forms hot fluid.Another part cold fluid into
Enter to pass through in 109 lower part wellbore space of packer, cold fluid passes through the enhanced heat transfer of coated inner wall during flowing downward
The casing 103 of material and the high-temperature geothermal fluid in production layer 101 and reservoir carry out heat exchange, absorb heat and are heated, temperature
It increases, becomes thermal fluid circulation.
Since shaft bottom 111 is blocked by bottom hole cement plugged zone 113, from production layer 101 absorb heat after hot fluid,
Under surface injection pressure effect, it can only be flowed into oil pipe flow channel 402 from 107 bottom inlet of collector tube, then along oil pipe
Flow channel 402 flows upwards out ground.Heat-insulating material is coated with inside 109 upper sleeve of packer due to passing through, from
Underground current divider 108 be further separated into the cold fluid in oil jacket annulus flow channel 401 from surrounding formation absorb heat it is few, temperature
It is kept low, and flows through the cold fluid for passing through 109 lower part wellbore space of packer by the high warm in production layer 101
Fluid and reservoir heat and form thermal fluid circulation, the cycling hot after this part is heated into after in oil pipe flow channel 402
Fluid is maintained at higher temperature levels.Fluid temperature (F.T.) in same depth, oil pipe flow channel 402 is higher than oil jacket ring
Fluid temperature (F.T.) in empty flow channel 401；Fluid in oil pipe flow channel 402 is that thermoelectric generation module 104 provides heat source,
High temperature hot end as thermoelectric generation module 104.Fluid in oil jacket annulus flow channel 401 is that thermoelectric generation module 104 mentions
For cold source, become the low temperature cold end of thermoelectric generation module 104.Thermoelectric generation module 104 is in oil jacket annulus flow channel 401
Fluid temperature (F.T.) and oil pipe flow channel 402 in fluid temperature (F.T.) between temperature difference under the action of produce electricl energy.From oil pipe stream
The hot fluid flowed out in dynamic channel 402 returns out fluid flow line 208 by oil pipe and utilizes module 206 into hot fluid；From oil
The hot fluid flowed out in set annular space flow channel 401 returns out fluid flow line 207 by oil jacket annulus and enters hot fluid benefit
With module 206；The hot fluid flowed out from oil pipe flow channel 402 and oil jacket annulus flow channel 401 utilizes module in hot fluid
After becoming cold fluid after being completely heat exchanged and utilize in 206, cold fluid is entered by cold fluid inflow line 205 and is stored
In container 204.
In conclusion cold fluid storage container 204, cold fluid flow go out pipeline 203, cold fluid injection pump 202, cold fluid
Injection pipeline 201, underground current divider 108, oil jacket annulus flow channel 401, passes through packer 109 at cold fluid injection pipe 106
Lower part wellbore space, collector tube 107, oil pipe flow channel 402, oil pipe return out fluid flow line 208, oil jacket annulus is returned out
Fluid flow line 207, hot fluid constitute the fluid circulation system of an enclosed using module 206 and cold fluid inflow line 205
System provides lasting cold energy and thermal energy for thermoelectric generation module 104, realizes underground thermoelectric power generation.
Thermoelectric heat generation system in the present embodiment is the shaft type heat exchange closed cycle underground heat disaster in the case of oil jacket annulus injection
The implementation method of electric electricity generation system, the system is：
(1) high temperature hot water type geothermal well or High water cut abandoned well are selected, is blocked shaft bottom 111 using cement, to prevent
High-temperature geothermal fluid in production layer 101 enters in pit shaft 112.101 thickness of layer and production 101 depth of layer are produced according to it, it will
Collector tube 107 is connected with penetration type oil pipe plug 110 and passes through penetration type oil pipe plug 110, with 402 phase of oil pipe flow channel
It is logical, it is then connected to the bottom that outer wall is consolidated with the oil pipe 105 of thermoelectric generation module 104, down toward production layer from casing 103
101 tops, and set oil pipe 105 on casing 103 using packer 109 is passed through；The deepening of collector tube 107 is no more than life
101 thickness of payzone.
(2) by the cold fluid injection pipe 6 with underground current divider 108 from 401 lower going-into-well of oil jacket annulus flow channel,
It is docked passing through at packer 109 with the interface passed through in packer 109.
(3) it is sequentially connected cold fluid storage container 204, cold fluid flow goes out pipeline 203, cold fluid injection pump 202 and cold flow
Body injects pipeline 201, and cold fluid injection pipeline 201 is connected with cold fluid injection pipe 6；Oil pipe flow channel 402 is passed through
Oil pipe is returned out fluid flow line 208 and is connected with hot fluid using module 206；Oil jacket annulus flow channel 401 is passed through into oil jacket
Annular space is returned out fluid flow line 207 and is connected with hot fluid using module 206；Hot fluid passes through cold fluid flow using module 206
Enter pipeline 205 and be connected to cold fluid storage container 204, to constitute the fluid circulating system of a closure.
(4) thermoelectric generation module 104 is connected by docking cable 301 with module 302 defeated outside electric energy, constitutes an electricity
Road system.
(5) cold fluid being stored in cold fluid storage container 204 goes out pipeline 203 through cold fluid flow and enters cold fluid note
After entering 202 pressurization of pump, pipeline 201 is injected by cold fluid and enters cold fluid injection pipe 6.
(6) when the cold fluid flow to flow downward in cold fluid injection pipe 6 is shunted through the underground of 6 bottom of cold fluid injection pipe
When device 108, a part of cold fluid in cold fluid injection pipe 6 is split into oil jacket annulus flow channel 401, and along oil
Set annular space flow channel 401 flows upward to ground, and part cold fluid temperature in uphill process can gradually rise, from oil jacket
It is hot fluid when inventionannulus flow channel 401 is flowed out；Another part cold fluid in cold fluid injection pipe 6 is infused in cold fluid
Enter in pipe 6 and continue to flow downward, into passing through in the wellbore space of 110 lower part of packer 109 and penetration type oil pipe plug, leads to
It crosses the casing of the enhanced heat-transfer matcrial of coated inner wall and the high-temperature geothermal fluid in production layer 101 and reservoir carries out heat exchange, temperature
Degree increases, and becomes thermal fluid circulation, and hot fluid is entered in oil pipe flow channel 402 by collector tube 107, and along oil pipe stream
Dynamic channel 402 flows upward to ground.
(7) fluid flow line 207 is returned out by oil jacket annulus from the hot fluid that oil jacket annulus flow channel 401 flows out
It flows into hot fluid and utilizes module 206；The hot fluid flowed out from oil pipe flow channel 402 returns out fluid flow line by oil pipe
208, which flow into hot fluid, utilizes module 206.
(8) hot fluid flowed out from oil jacket annulus flow channel 401 and oil pipe flow channel 402 utilizes mould in hot fluid
It is returned in cold fluid storage container 204 after heat exchange and utilization by cold fluid inflow line 205 in block 206.
(9) high temperature fluid and oil jacket annulus flow channel 401 of the thermoelectric generation module 104 in oil pipe flow channel 402
In cryogen between temperature difference under the action of produce electricl energy, and by docking cable 301 will be defeated outside electric energy inputing power
Module 302.
Embodiment two
Shaft type heat exchange closed cycle underground thermoelectric heat generation system in the case of oil pipe injection as shown in Figure 4, with embodiment
The difference of the heat exchange closed cycle underground thermoelectric heat generation system of shaft type described in one is：The setting of cold fluid injection pipe 106 exists
In oil pipe flow channel 402.Cold fluid injection pipe 106 tripping in and passes through penetration type oil pipe plug 110 from oil pipe 105, and wears
The more wellbore space connection of 109 lower part of packer.The part cold fluid distributed from underground current divider 108 enters oil pipe flowing
Channel 402 simultaneously flows upwards out ground along oil pipe flow channel 402.Collector tube 107 passes through packer 109 and oil jacket annulus
Flow channel 401 is connected to.The lower end of cold fluid injection pipe 106 stretches to after passing through penetration type oil pipe plug 110 positioned at production layer
In casing in 101 ranges, the upper end of the collector tube 107, which is installed through, to be passed through on packer 109, and lower end is lain in
Produce 101 range of layer in casing in, between bottom and pit shaft shaft bottom 111 be equipped with gap, and 107 inner cavity of the collector tube with
Oil jacket annulus flow channel 401 is connected.Another part cold fluid distributed through underground current divider 108, which enters, passes through packing
The wellbore space of 109 lower part of device and by production layer 101 high-temperature geothermal fluid and reservoir heating after form thermal fluid circulation,
Then entered in oil jacket annulus flow channel 401 by collector tube 107 and flowed upwards out along oil jacket annulus flow channel 401
Ground.Fluid in oil pipe flow channel 402 is that thermoelectric generation module 104 provides cold source, becomes thermoelectric generation module 104
Low temperature cold end.Fluid in oil jacket annulus flow channel 401 is that thermoelectric generation module 104 provides heat source, becomes thermoelectric power generation
The high temperature hot end of module 104.Fluid temperature (F.T.) and oil pipe flowing of the thermoelectric generation module 104 in oil jacket annulus flow channel 401
It is produced electricl energy under the action of the temperature difference between fluid temperature (F.T.) in channel 402.
As shown in figure 5, in the present embodiment, cold fluid injection pipe 106, oil pipe 105, casing 103 and thermoelectric generation module
104 cross section is circle.
As shown in fig. 6, in the present embodiment, collector tube 107 passes through packer 109 and penetration type oil pipe plug 110 exists
Cross section is circle.
Thermoelectric heat generation system in the present embodiment is the shaft type heat exchange closed cycle underground thermoelectricity hair in the case of oil pipe injection
The implementation method of electric system, the system is：
(1) high temperature hot water type geothermal well or High water cut abandoned well are selected, is blocked shaft bottom 111 using cement, to prevent
High-temperature geothermal fluid in production layer 101 enters in pit shaft 112.101 thickness of layer and production 101 depth of layer are produced according to it, it will
Collector tube 107 with pass through packer 109 and be connected and pass through packer 109, communicated with oil jacket annulus flow channel 401, so
Be connected to the bottom that outer wall is consolidated with the oil pipe 105 of thermoelectric generation module 104 afterwards, from casing 103 down toward production layer 101 on
Side, and set oil pipe 105 on casing 103 using packer 109 is passed through.The deepening of collector tube 107 is no more than production layer
101 thickness.
(2) by the cold fluid injection pipe 6 with underground current divider 108 from 402 tripping in oil pipe 105 of oil pipe flow channel,
It is docked at penetration type oil pipe plug 110 with the interface of penetration type oil pipe plug 110.
(3) it is sequentially connected cold fluid storage container 204, cold fluid flow goes out pipeline 203, cold fluid injection pump 202 and cold flow
Body injects pipeline 201, and cold fluid injection pipeline 201 is connected with cold fluid injection pipe 6.Oil pipe flow channel 402 is passed through
Oil pipe is returned out fluid flow line 208 and is connected with hot fluid using module 206.Oil jacket annulus flow channel 401 is passed through into oil jacket
Annular space is returned out fluid flow line 207 and is connected with hot fluid using module 206.Hot fluid passes through cold fluid flow using module 206
Enter pipeline 205 and be connected to cold fluid storage container 204, to constitute the fluid circulating system of a closure.
(4) thermoelectric generation module 104 is connected by docking cable 301 with module 302 defeated outside electric energy, constitutes an electricity
Road system.
(5) cold fluid being stored in cold fluid storage container 204 goes out pipeline 203 through cold fluid flow and enters cold fluid note
After entering 202 pressurization of pump, pipeline 201 is injected by cold fluid and enters cold fluid injection pipe 6.
(6) when the cold fluid flow to flow downward in cold fluid injection pipe 6 is shunted through the underground of 6 bottom of cold fluid injection pipe
When device 108, a part of cold fluid in cold fluid injection pipe 6 is split into oil pipe flow channel 402, and along oil pipe
Flow channel 402 flows upward to ground, and part cold fluid temperature in uphill process can gradually rise, and flows from oily oil pipe
It is hot fluid when channel 402 is flowed out；Another part cold fluid in cold fluid injection pipe 6 is relayed in cold fluid injection pipe 6
It is continuous to flow downward, into passing through in the wellbore space of 110 lower part of packer 109 and penetration type oil pipe plug, pass through coated inner wall
The casing of enhanced heat-transfer matcrial and the high-temperature geothermal fluid in production layer 101 and reservoir carry out heat exchange, and temperature increases, and becomes
At thermal fluid circulation, hot fluid is entered in oil jacket annulus flow channel 401 by collector tube 107 and is flowed along oil jacket annulus
Channel 401 flows upward to ground.
(7) fluid flow line 207 is returned out by oil jacket annulus from the hot fluid that oil jacket annulus flow channel 401 flows out
It flows into hot fluid and utilizes module 206；The hot fluid flowed out from oil pipe flow channel 402 returns out fluid flow line by oil pipe
208, which flow into hot fluid, utilizes module 206.
(8) hot fluid flowed out from oil jacket annulus flow channel 401 and oil pipe flow channel 402 utilizes mould in hot fluid
It is returned in cold fluid storage container 204 after heat exchange and utilization by cold fluid inflow line 205 in block 206.
(9) high temperature fluid and oil pipe flow channel 402 of the thermoelectric generation module 104 in oil jacket annulus flow channel 401
In cryogen between temperature difference under the action of produce electricl energy, and by docking cable 301 will be defeated outside electric energy inputing power
Module 302.
Claims (8)
- The closed cycle underground thermoelectric heat generation system 1. shaft type exchanges heat, which is characterized in that including：Pit shaft, fluid circulation module and electricity It can outer defeated module；The pit shaft includes successively drilling production layer superstratum from up to down and producing the casing of layer, insertion setting in casing Oil pipe, the thermoelectric generation module, cold fluid injection pipe and the collector tube that are arranged on oil-pipe external wall；The top of the oil pipe and set The top of pipe is concordant, and bottom is located at production layer superstratum and produces the intersection of layer；The lower end outside of the oil pipe is by wearing For more packer setting on internal surface of sleeve pipe, the bottom inside of oil pipe is equipped with penetration type oil pipe plug；The thermoelectric generation module is set It sets on the oil pipe being positioned across above packer, and thermoelectric generation module is connected by docking cable with module defeated outside electric energy； Space between described sleeve pipe inner wall and thermoelectric generation module outer wall forms oil jacket annulus flow channel；The oil pipe inner space Form oil pipe flow channel；The cold fluid injection pipe setting is in oil jacket annulus flow channel or in oil pipe flow channel；The cold fluid injection pipe It is interior to be equipped with the underground current divider being located within the scope of production layer superstratum；When cold fluid injection pipe is located at oil jacket annulus flow channel When middle, the lower end of cold fluid injection pipe stretches in the casing being located within the scope of production layer after passing through packer, the collection The upper end insertion of liquid pipe is mounted in penetration type oil pipe plug, and lower end stretches in the casing being located within the scope of production layer, bottom Gap is equipped between pit shaft shaft bottom, and the liquid collecting tube cavity is connected with oil pipe flow channel；When cold fluid injection pipe position When in oil pipe flow channel, the lower end of cold fluid injection pipe is stretched to after passing through penetration type oil pipe plug positioned at production layer range In interior casing, the upper end of the collector tube, which is installed through, to be passed through on packer, and lower end is lain within the scope of production layer In casing, gap is equipped between bottom and pit shaft shaft bottom, and the liquid collecting tube cavity is connected with oil jacket annulus flow channel；The fluid circulation module includes cold fluid injection pipeline, cold fluid injection pump, cold fluid flow goes out pipeline, cold fluid stores Container, cold fluid inflow line, hot fluid returns out fluid flow line using module, oil jacket annulus and oil pipe returns out fluid and flows Pipeline；The outlet of the cold fluid injection pump injects pipeline by cold fluid and is connected with the upper end opening of cold fluid injection pipe, cold The entrance of fluid charge pump goes out pipeline by cold fluid flow and is connected with the outlet of cold fluid storage container；The cold fluid storage is held The entrance of device is connected with hot fluid using the outlet of module by cold fluid inflow line；The hot fluid utilizes the entrance of module It returns out fluid flow line by oil pipe to be connected with oil pipe flow channel, hot fluid also passes through oil jacket annulus using the entrance of module Fluid flow line is returned out to be connected with oil jacket annulus flow channel.
- The closed cycle underground thermoelectric heat generation system 2. shaft type according to claim 1 exchanges heat, which is characterized in that the pit shaft For the cell structure for drilling stratum, realized using setting of casing to shaft bottom cementing well mode；Described sleeve pipe and production layer and life Payzone upper caldding layer is close cementing.
- The closed cycle underground thermoelectric heat generation system 3. shaft type according to claim 1 exchanges heat, which is characterized in that described to be in It produces and is coated with heat-insulating material on the internal surface of sleeve pipe within the scope of layer superstratum；The internal surface of sleeve pipe within the scope of production layer It is upper to be coated with heat-transfer matcrial.
- The closed cycle underground thermoelectric heat generation system 4. shaft type according to claim 1 exchanges heat, which is characterized in that the thermoelectricity Electricity generation module includes the thermoelectric generator that several groups are serially connected；The thermoelectric generator includes several groups thermoelectric power generation unit； The thermoelectric power generation unit includes a N-type semiconductor and a P-type semiconductor, N-type half between adjacent thermoelectric power generation unit Conductor and P-type semiconductor are alternately arranged.
- The closed cycle underground thermoelectric heat generation system 5. shaft type according to claim 1 exchanges heat, it is characterised in that：The set Pipe, oil pipe, cold fluid injection pipe, collector tube, to pass through packer and the cross section of penetration type oil pipe plug be circle；The oil Pipe is coaxially disposed with casing；The cross section of the thermoelectric generation module is circular ring shape.
- The closed cycle underground thermoelectric heat generation system 6. shaft type according to claim 1 exchanges heat, which is characterized in that the cold flow Body injection pump and cold fluid storage container are respectively positioned on ground.
- 7. a kind of heat using the heat exchange closed cycle underground thermoelectric heat generation system of shaft type described in claim 1~6 any one Electric electricity-generating method, which is characterized in thatS1, when cold fluid injection pipe is located in oil jacket annulus flow channel, this approach includes the following steps：S11, the cold fluid being stored in cold fluid storage container go out pipeline through cold fluid flow and enter the pressurization of cold fluid injection pump Afterwards, pipeline is injected by cold fluid and enters cold fluid injection pipe；S12, when the cold fluid flow to flow downward in cold fluid injection pipe through cold fluid injection bottom of the tube underground current divider when, Under the shunting function of underground current divider, a part of cold fluid in cold fluid injection pipe is split logical into oil jacket annulus flowing Road, and ground is flowed upward to along oil jacket annulus flow channel, part cold fluid temperature in uphill process can gradually rise, It is hot fluid when outflow from oil jacket annulus flow channel；Another part cold fluid in cold fluid injection pipe is infused in cold fluid Enter and continues to flow downward in pipe, into passing through in the wellbore space of packer and penetration type oil pipe plug lower part, the part cold flow Body carries out heat exchange with reservoir by the high-temperature geothermal fluid in casing and production layer, and temperature increases, and becomes thermal fluid circulation, should Part hot fluid is entered in oil pipe flow channel by collector tube, and flows upward to ground along oil pipe flow channel；S13, the hot fluid flowed out from oil jacket annulus flow channel return out fluid flow line by oil jacket annulus and flow into hot fluid Utilize module；The hot fluid flowed out from oil pipe flow channel returns out fluid flow line inflow hot fluid by oil pipe and utilizes mould Block；S14, the hot fluid flowed out from oil jacket annulus flow channel and oil pipe flow channel utilize in module in hot fluid through overheating It is returned in cold fluid storage container after exchange and utilization by cold fluid inflow line；The cryogen of S15, thermoelectric generation module in the high temperature fluid and oil jacket annulus flow channel in oil pipe flow channel Between temperature difference under the action of produce electricl energy, and by docking cable by module defeated outside electric energy inputing power；S2, when cold fluid injection pipe is located in oil pipe flow channel, this approach includes the following steps：S21, the cold fluid being stored in cold fluid storage container go out pipeline through cold fluid flow and enter the pressurization of cold fluid injection pump Afterwards, pipeline is injected by cold fluid and enters cold fluid injection pipe；S22, when the cold fluid flow to flow downward in cold fluid injection pipe through cold fluid injection bottom of the tube underground current divider when, Under the shunting function of underground current divider, a part of cold fluid in cold fluid injection pipe is split into oil pipe flow channel, and Ground is flowed upward to along oil pipe flow channel, part cold fluid temperature in uphill process can gradually rise, from oil pipe stream It is hot fluid when dynamic channel outflow；Another part cold fluid in cold fluid injection pipe continue in cold fluid injection pipe to Lower flowing, into passing through in the wellbore space of packer and penetration type oil pipe plug lower part, the part cold fluid by casing with The high-temperature geothermal fluid and reservoir produced in layer carries out heat exchange, and temperature increases, and becomes thermal fluid circulation, and the part hot fluid is logical It crosses collector tube to enter in oil jacket annulus flow channel, and flows upward to ground along oil jacket annulus flow channel；S23, the hot fluid flowed out from oil jacket annulus flow channel return out fluid flow line by oil jacket annulus and flow into hot fluid Utilize module；The hot fluid flowed out from oil pipe flow channel returns out fluid flow line inflow hot fluid by oil pipe and utilizes mould Block；S24, the hot fluid flowed out from oil jacket annulus flow channel and oil pipe flow channel utilize in module in hot fluid through overheating It is returned in cold fluid storage container after exchange and utilization by cold fluid inflow line；The cryogen of S25, thermoelectric generation module in the high temperature fluid and oil pipe flow channel in oil jacket annulus flow channel Between temperature difference under the action of produce electricl energy, and by docking cable by module defeated outside electric energy inputing power.
- 8. thermoelectric power generation method according to claim 7, it is characterised in that：The cold fluid be water, liquid carbon dioxide, Any one in liquid nitrogen.
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