CN110230896B - Underground heat extraction device and underground heat extraction method - Google Patents
Underground heat extraction device and underground heat extraction method Download PDFInfo
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- CN110230896B CN110230896B CN201910438888.XA CN201910438888A CN110230896B CN 110230896 B CN110230896 B CN 110230896B CN 201910438888 A CN201910438888 A CN 201910438888A CN 110230896 B CN110230896 B CN 110230896B
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- 238000000605 extraction Methods 0.000 title claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 121
- 239000008398 formation water Substances 0.000 claims description 44
- 239000007788 liquid Substances 0.000 claims description 21
- 238000004891 communication Methods 0.000 claims description 19
- 238000005553 drilling Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 7
- 238000005086 pumping Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 229920005630 polypropylene random copolymer Polymers 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention provides an underground heat taking device and an underground heat taking method, wherein the underground heat taking device comprises: water pump, first sleeve and extension pipe, the both ends of first sleeve all are connected with the end cover, and the water inlet of water pump sets up in first sleeve, the one end and the first sleeve intercommunication of extension pipe, and the other end is used for extending in the pit. According to the invention, the technical problems that a water pump needs to have a large lift, required power is large and cost is high when stratum water is extracted in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of geothermal exploitation, in particular to an underground heat taking device and an underground heat taking method.
Background
In the process of extracting geothermal heat, it is often necessary to pump hot water underground to the surface, typically using a water pump to pump water at a suitable location below the surface of the still water. However, in the actual operation process, when the water pump pumps water to a certain position, the water temperature at the position is often low, and it is difficult to obtain enough heat; when this is encountered, it is often necessary to increase the depth of the pumping location to pump formation water deeper from the surface.
The depth of the water pumping position is increased, the lift of the water pump needs to be increased, and the working power of the water pump is increased, so that the mining cost is too high, and the economic benefit is reduced.
Disclosure of Invention
The invention aims to provide an underground heat extraction device and an underground heat extraction method, which are used for solving the technical problems that a water pump needs to have a large lift, required power is large and cost is high when stratum water is extracted in the prior art.
The above object of the present invention can be achieved by the following technical solutions:
the invention provides a downhole heat extraction device, comprising: the water pump, first sleeve and extension pipe, the both ends of first sleeve all are connected with the end cover, the water inlet of water pump set up in the first sleeve, the one end of extension pipe with first sleeve intercommunication, the other end is used for extending in the pit.
In a preferred embodiment, the water pump is a submersible pump disposed within the first sleeve; and a water outlet of the submersible pump is connected with a water outlet pipe extending out of the first sleeve.
In a preferred embodiment, the extension pipe is made of a thermal insulation material.
In a preferred embodiment, a first end cover is connected to the lower end of the first sleeve, the first end cover is provided with a taper pipe threaded hole, and the extension pipe is connected to the taper pipe threaded hole.
In a preferred embodiment, a second end cap is connected to the upper end of the first sleeve; the water outlet pipe comprises a first pipe section and a second pipe section, the lower end of the first pipe section is connected to the water outlet of the water pump, and the upper end of the first pipe section is connected to the second end cover; the lower end of the second tube section is connected to the second end cap and is in communication with the first tube section.
In a preferred embodiment, the downhole heat removal device comprises a second sleeve and an exhaust pipe, the second sleeve being disposed within the first sleeve, the water pump being disposed within the second sleeve; the lower part of the second sleeve is closed, and the upper part of the second sleeve is provided with a communication hole communicated with the first sleeve; the exhaust pipe is communicated with the upper part of the second sleeve.
In a preferred embodiment, the communication hole is provided in a side wall of the second sleeve.
In a preferred embodiment, the side wall of the second sleeve is provided with a plurality of communication holes circumferentially spaced around the axis of the second sleeve.
In a preferred embodiment, a third end cap is connected to the upper end of the second sleeve; the water outlet pipe comprises a first pipe section and a second pipe section, the lower end of the first pipe section is connected to the water outlet of the water pump, and the upper end of the first pipe section is connected to the third end cover; the lower end of the second pipe section is connected to the third end cover and communicated with the first pipe section, and the upper end of the second pipe section extends out of the first sleeve.
The invention provides a downhole heat extraction method, which adopts the downhole heat extraction device and comprises the following steps:
s100, drilling according to the designed depth;
step S200, lowering the first sleeve into a well, and enabling the liquid level of still water to be higher than that of the first sleeve;
and step S300, starting the water pump to recover the formation water in the well.
The invention has the characteristics and advantages that: when the underground heat extraction device provided by the invention is used for producing formation water, the first sleeve is put into the well, and the extension pipe extends to a deeper position in the well from the first sleeve. The first sleeve is communicated with the space in the well through an extension pipe; due to the effect of the liquid column pressure difference, formation water in the well enters the first sleeve through the extension pipe, and the water in the first sleeve can be pumped to the ground through the water pump.
Formation water needs to enter from the lower end opening of the extension pipe, so that when the water pump pumps water, the formation water in the well above the lower end opening of the extension pipe needs to flow to the lower end opening of the extension pipe from top to bottom, and then can enter the extension pipe. The formation water can be heated gradually by absorbing and utilizing the heat of the position with larger depth in the well in the process of flowing from top to bottom, so that the temperature of the formation water entering the first sleeve through the extension pipe is higher.
According to the underground heat taking device provided by the invention, the lower end of the extension pipe can be lowered into the well at a position deeper than the first sleeve, and formation water at the deeper position in the well enters the first sleeve through the extension pipe; the water pump pumps the formation water in the first sleeve to the surface. Like this, the water pump is taken water with less lift, and power is lower, has realized extracting the groundwater of higher temperature from the position deeper in the well, has saved the cost, and economic benefits is better.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of a downhole heat removal device according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a downhole heat removal device according to another embodiment of the present invention;
FIG. 3 is a schematic view of a second sleeve of the downhole thermal extraction apparatus of FIG. 2;
FIG. 4 is a schematic structural view of a first end cap of the downhole heat removal device provided by the present invention;
FIG. 5 is a schematic view of a second end cap of the downhole heat removal device of FIG. 1;
FIG. 6 is a schematic view of a second end cap of the downhole heat removal device of FIG. 2;
FIG. 7 is a schematic view of a third endcap in the downhole heat removal device shown in FIG. 2;
FIG. 8 is a schematic view of a fourth endcap in the downhole heat removal device shown in FIG. 2;
FIG. 9 is a schematic view of an extension tube of the downhole thermal tool of the present invention;
FIG. 10 is a schematic structural view of a first pipe segment in a downhole thermal extraction apparatus provided in accordance with the present invention;
FIG. 11 is a schematic structural view of a second tubular segment of a downhole heat removal device provided in accordance with the present invention;
FIG. 12 is a schematic diagram of a downhole heat removal method provided by the present invention.
The reference numbers illustrate: 10. a first sleeve; 20. an extension tube; 30. a water pump; 31. a water inlet of the water pump; 40. a water outlet pipe; 41. a first tube section; 42. a second tube section; 51. a first end cap; 511. a first taper pipe threaded hole; 52. a second end cap; 521. a second taper threaded bore; 522. a third taper pipe threaded hole; 60. a second sleeve; 61. a communicating hole; 62. an exhaust pipe; 71. a third end cap; 711. a fourth taper pipe threaded hole; 712. a fifth taper pipe threaded hole; 713. a sixth taper pipe threaded hole; 72. a fourth end cap; 81. the liquid level of the still water; 82. a liquid level in the first sleeve; 83. a liquid level in the second sleeve; 91. an upper wellbore section; 92. and a lower end borehole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1 and 9, arrows in fig. 1 indicate a flow path of formation water, and the present invention provides a downhole heat removal apparatus comprising: water pump 30, first sleeve 10 and extension pipe 20, the both ends of first sleeve 10 all are connected with the end cover, and the water inlet 31 of water pump sets up in first sleeve 10, and the one end and the first sleeve 10 intercommunication of extension pipe 20, the other end are used for extending in the pit. When the underground heat extraction device provided by the invention is used for producing formation water, the first sleeve 10 is put into a well, and the extension pipe 20 extends to a deeper position in the well from the first sleeve 10. The first sleeve 10 is communicated with the space in the well through an extension pipe 20; formation water in the well enters the first sleeve 10 through the extension pipe 20 due to the differential pressure of the liquid column, and the water pump 30 can pump the water in the first sleeve 10 to the surface.
Since the formation water needs to enter from the lower end opening of the extension pipe 20, when the water pump 30 pumps water, the formation water in the well above the lower end opening of the extension pipe 20 needs to flow from top to bottom to the lower end opening of the extension pipe 20, and then enters into the extension pipe 20. The formation water flowing from the top down can absorb and utilize heat from a location of greater depth in the well and be gradually heated, thus resulting in a higher temperature of the formation water entering the first sleeve 10 through the extension pipe 20.
According to the underground heat taking device provided by the invention, the lower end of the extension pipe 20 can be lowered into the well at a position deeper than the first sleeve 10, and formation water at the deeper position in the well enters the first sleeve 10 through the extension pipe 20; the water pump 30 pumps formation water from the first sleeve 10 to the surface. Like this, the water pump is taken water with less lift, and power is lower, has realized extracting the groundwater of higher temperature from the position deeper in the well, has saved the cost, and economic benefits is better.
In order to facilitate the pumping of water from the deep well, the water pump 30 adopts a submersible pump, and the submersible pump is arranged in the first sleeve 10; the water outlet of the submersible pump is connected with a water outlet pipe 40 extending out of the first sleeve 10. When pumping water, the first sleeve 10 is lowered into the well with the water pump inlet 31 below the still water level 81 in the well. During pumping, the water pump 30 sends the formation water in the first sleeve 10 to the ground surface through the water outlet pipe 40, and the formation water in the well enters the first sleeve 10 through the extension pipe 20 for supplementation; after equilibrium is reached, the level of liquid in the first sleeve 10 is substantially constant, below the still liquid level 81. The lowered position of the first sleeve 10 ensures that the water inlet 31 of the water pump is below the liquid level 82 in the first sleeve.
The temperature of the formation water is affected by the earth temperature gradient, which is generally 2-4 ℃ per hundred meters. In some geothermal wells, the temperature of the formation water gradually increases from top to bottom; the inventor finds that when the extension pipe 20 is made of a steel pipe, heat transfer occurs between the wall of the extension pipe 20 and the outside during the process that the formation water flows in the extension pipe 20, and the temperature of the formation water in the extension pipe is reduced. Therefore, the inventor makes further improvements: the extension pipe 20 is made of a heat-insulating material; in some embodiments, the extension tube 20 is a PE (polyethylene) tube, which has good thermal insulation properties and can reduce heat loss from formation water during flow. In other embodiments, extension tube 20 is a PPR (polypropylene random copolymer) tube with good thermal insulation properties to reduce heat loss from the formation water during flow.
As another embodiment, the extension tube 20 is wrapped with an insulating layer to block heat transfer inside and outside the tube. Specifically, extension pipe 20 adopts the steel pipe, wraps up the heat preservation outside the steel pipe, like this, when realizing the heat preservation effect, can also guarantee that extension pipe 20 has higher intensity, is convenient for go into the well deeper position.
In one embodiment of the present invention, the first sleeve 10 is a steel cylinder, so that the first sleeve 10 has high strength. In order to reduce the heat loss of the formation water in the first sleeve 10, an insulation layer is provided outside the first sleeve 10.
In an embodiment of the present invention, referring to fig. 1 and 4, a first end cap 51 is connected to a lower end of the first sleeve 10, and the first end cap 51 is one of end caps connected to two ends of the first sleeve 10. The first end cap 51 is provided with a first taper pipe threaded hole 511, and as shown in fig. 4, the inner diameter of the first taper pipe threaded hole 511 is gradually reduced from bottom to top. The extension pipe 20 is coupled to the first taper pipe screw hole 511. The first end cap 51 may serve as a barrier to allow formation water in the well to flow down to the lower end of the extension pipe 20 and through the extension pipe 20 into the first sleeve 10; at the same time, the assembly of the extension pipe 20 with the first sleeve 10 is more facilitated. The extension tube 20 cooperates with the first taper tube threaded hole 511 to ensure a good seal at the connection to reduce leakage at the connection.
In an embodiment of the present invention, referring to fig. 1, 10 and 11, a second end cap 52 is connected to an upper end of the first sleeve 10, and the second end cap 52 is one of end caps connected to two ends of the first sleeve 10; the water outlet pipe 40 comprises a first pipe section 41 and a second pipe section 42, the lower end of the first pipe section 41 is connected to the water outlet of the water pump 30, and the upper end of the first pipe section 41 is connected to the second end cover 52; the lower end of the second tube section 42 is connected to the second end cap 52 and communicates with the first tube section 41. The first pipe section 41 suspends the water pump 30 below the second end cap 52, and the position of the water pump 30 in the first sleeve 10 can be adjusted by changing the length of the first pipe section 41. The upper end of the second pipe section 42 extends to the wellhead for transporting the formation water pumped by the water pump 30 to the surface. The second pipe section 42 is fixed to the wellhead, and the second pipe section 42 bears the weight of the first sleeve 10, the water pump 30 and the extension pipe 20, and plays a role in installing and fixing the downhole heat extraction device provided by the invention. At the same time, the depth of the run-in of the first sleeve 10 can be adjusted by changing the length of the second tube section 42.
Preferably, the lower end of the first pipe section 41 is provided with a flange which is matched with the water pump 30 so as to be connected with the water pump 30 more firmly.
Preferably, referring to fig. 5, the inner surface of the second end cap 52 is provided with a second taper pipe threaded hole 521 matched with the first pipe section 41, as shown in fig. 5, the inner diameter of the second taper pipe threaded hole 521 is gradually reduced from bottom to top; the outer surface of the second end cap 52 is provided with a third taper pipe threaded hole 522 matched with the second pipe section 42, as shown in fig. 5, the inner diameter of the third taper pipe threaded hole 522 is gradually reduced from top to bottom; the second tapered bore 521 communicates with the third tapered bore 522 to provide better sealing between the first pipe segment 41 and the second end cap 52 and between the second pipe segment 42 and the second end cap 52.
The second section 42 carries the pull force generated by the weight of the water pump 30. Preferably, the axis of the first pipe section 41, the axis of the second pipe section 42, the axis of the rotating shaft of the water pump 30, the axis of the first sleeve 10 and the axis of the extension pipe 20 are all coincident, so that the stress distribution of the downhole heat extraction device provided by the invention is more balanced, the stress of the water pump 30 is improved, and the stability of the whole structure is improved.
In the mining experiment, when the underground heat extraction device provided by the invention is used, the water temperature is increased from 42 ℃ to 63 ℃ under the condition that the dropping depth of a water pump is not changed, and the heating effect is obvious.
Example two
In the deep layer of the stratum, the phenomenon of water-gas mixing is obvious, and more gas is mixed in the stratum water. When the water and the gas meet the condition of the same layer, the phenomenon of water and gas mixing is more obvious. The water-air mixing can have adverse effects on the water feeding efficiency of the pump; when the influence is serious, the pump is not watered, high temperature is generated in the dry running of the pump, and the pump, a motor and a cable are burnt out.
Therefore, the inventor improves the underground heat extraction device provided by the invention, so that the underground heat extraction device can separate water and gas to reduce the adverse effect of the water and gas mixing phenomenon. Referring to fig. 2 and 3, the arrows in fig. 2 indicate the flow paths of formation water and the liquid and gas therein, the downhole heat removal device includes a second sleeve 60, a gas exhaust pipe 62, and the water pump 30 and the first sleeve 10, the second sleeve 60 is disposed in the first sleeve 10, and the water pump 30 is disposed in the second sleeve 60; the lower part of the second sleeve 60 is closed, and the upper part is provided with a communication hole 61 communicated with the first sleeve 10; the exhaust pipe 62 communicates with an upper portion of the second sleeve 60.
Formation water enters the first sleeve 10 from the lower end, moves from the bottom up in the space outside the second sleeve 60, and then flows into the second sleeve 60 through the communication holes 61. Since the density of the gas portion is lower than that of the liquid portion in the formation water, the formation water is separated at the communication holes 61: the gas part moves upwards and is exhausted out of the first sleeve 10 through the exhaust pipe 62; the liquid portion of which then flows downwards into the water inlet 31 of the pump. Therefore, the gas content in the formation water entering the water pump 30 is lower, the adverse effect of the water-gas mixing phenomenon is reduced, and the water feeding efficiency of the water pump 30 is improved.
According to the downhole heat extraction device provided by the invention, the first sleeve 10 is matched with the second sleeve 60, so that the formation water moves upwards firstly and then moves downwards in a turning manner, and the gas in the formation water is separated and discharged upwards due to smaller self gravity. In order to achieve the above-described effects, the communication hole 61 may be provided in an upper portion of the sidewall of the second sleeve 60 or in an upper end surface of the second sleeve 60. Preferably, the communication holes 61 are provided at the upper portion of the sidewall of the second sleeve 60, and the formation water has an initial velocity of moving upward as it flows through the communication holes 61 on the sidewall; the water inlet 31 of the water pump is positioned below the communication hole 61, and the liquid part in the formation water turns to move downwards under the action of the self gravity; the gas part in the formation water is smaller due to the gravity of the gas part, and then the gas part continues to move upwards under the action of the initial speed of the upward movement, so that the gas part is easier to separate from the liquid part.
Further, the second sleeve 60 is a cylindrical steel sleeve, and the sidewall of the second sleeve 60 is provided with a plurality of communication holes 61 circumferentially distributed around the axis of the second sleeve 60 at intervals, so that the formation water in the first sleeve 10 flows from the periphery to the center and enters the second sleeve 60. In one embodiment of the present invention, the sidewall of the second sleeve 60 is provided with 2 communication holes 61, and the axes of the 2 communication holes 61 coincide with and intersect the axis of the second sleeve 60.
As shown in fig. 2, 7, 10 and 11, the third end cap 71 is connected to the upper end of the second sleeve 60; the water outlet pipe 40 comprises a first pipe section 41 and a second pipe section 42, the lower end of the first pipe section 41 is connected to the water outlet of the water pump 30, and the upper end of the first pipe section 41 is connected to the third end cover 71; the lower end of the second pipe section 42 is connected to the third end cap 71 and is communicated with the first pipe section 41, and the upper end of the second pipe section 42 extends out of the first sleeve 10. The first pipe section 41 suspends the water pump 30 below the third end cap 71, and the position of the water pump 30 in the second sleeve 60 can be adjusted by changing the length of the first pipe section 41.
Preferably, the third end cap 71 is provided with a fourth taper threaded hole 711 matched with the first pipe segment 41, a fifth taper threaded hole 712 matched with the second pipe segment 42 and a sixth taper threaded hole 713 matched with the exhaust pipe 62, so that the sealing performance between the first pipe segment 41 and the third end cap 71, between the second pipe segment 42 and the third end cap 71 and between the exhaust pipe 62 and the third end cap 71 is better. As shown in fig. 7, the inner diameter of the fourth taper pipe threaded hole 711 decreases from bottom to top, the inner diameter of the fifth taper pipe threaded hole 712 decreases from top to bottom, the inner diameter of the sixth taper pipe threaded hole 713 decreases from top to bottom, and the fourth taper pipe threaded hole 711 communicates with the fifth taper pipe threaded hole 712.
The second tube section 42 and the exhaust tube 62 both pass through the first sleeve 10. The water pump 30 delivers formation water to the surface through the first pipe section 41 and the second pipe section 42; the separated gas is discharged out of the first sleeve 10 through the gas discharge pipe 62. In the present embodiment, referring to fig. 6, two through holes are formed on the second end cap 52 for the second pipe section 42 and the exhaust pipe 62 to pass through respectively, and the second pipe section 42 and the second end cap 52 and the exhaust pipe 62 and the second end cap 52 are in sealing fit.
Referring to fig. 8, a fourth end cap 72 is fixedly connected to the lower end of the second sleeve 60, and the fourth end cap 72 is used for closing the lower end of the second sleeve 60.
In one embodiment of the present invention, the second tube segment 42 is fixedly connected to the second end cap 52. Securing a second pipe section 42 to the wellhead, the second pipe section 42 carrying the weight of the first sleeve 10, the weight of the second sleeve 60, the weight of the water pump 30 and the weight of the extension pipe 20, serves to install and secure the downhole heat removal device. At the same time, the depth of run of the first sleeve 10 and the second sleeve 60 can be adjusted by changing the length of the second pipe section 42.
Preferably, the axis of the first pipe section 41, the axis of the second pipe section 42, the axis of the rotating shaft of the water pump 30, the axis of the first sleeve 10, the axis of the second sleeve 60 and the axis of the extension pipe 20 are all coincident, so that the stress distribution of the downhole heat extraction device is more balanced, the stress of the water pump 30 is improved, and the stability of the whole structure is improved.
As another embodiment of the present invention, the second and third end caps 52 and 71 are an integral end cap, the upper end of the first sleeve 10 and the upper end of the second sleeve 60 are fixed to the lower surface of the integral end cap, and the exhaust pipe 62, the first pipe section 41, and the second pipe section 42 are connected to the integral end cap.
Further, a first centralizer is disposed between the side wall of the first sleeve 10 and the side wall of the second sleeve 60 to ensure the installation accuracy between the first sleeve 10 and the second sleeve 60. In order to facilitate installation of the underground heat extraction device provided by the invention, a second centralizer is arranged outside the first sleeve 10, and the second centralizer is favorable for ensuring the installation accuracy of the first sleeve 10 in a well and enables the axis of the first sleeve 10 to be arranged along the vertical direction.
In one embodiment of the present invention, a check valve is connected to the exhaust pipe 62 to prevent gas from flowing back into the second sleeve 60. Further, a pressure gauge is connected to the exhaust pipe 62 for controlling the discharge of the gas. The gas discharge pipe 62 may extend to the wellhead to deliver the separated gas to the surface.
The underground heat extraction device provided by the embodiment has the advantages of simpler overall structure, convenience in use and low price, and can be applied to oil gas exploitation for underground oil-gas separation.
EXAMPLE III
As shown in fig. 12, the present invention provides a downhole heat extraction method, which uses the downhole heat extraction device. The method comprises the following steps:
s100, drilling according to the designed depth;
step S200, the first sleeve 10 is lowered into the well, and the liquid level 81 of the still water is higher than that of the first sleeve 10;
step S300, the water pump 30 is started to recover the formation water in the well.
When the water and gas are mixed obviously, the underground heat taking device comprising the second sleeve 60 is adopted to separate water and gas and ensure the stable operation of the water pump.
As an embodiment of the present invention, in step S100, the wellbore structure is designed in two stages. The upper section of the wellbore 91 is larger, and the bottom of the upper section of the wellbore 91 is about 250m away from the hydrostatic level 81; lower wellbore 92 is smaller. In step S100, the extension pipe 20 extends downward in the vertical direction to the lower wellbore 92; the upper wellbore 91 serves as a pumping chamber, the first sleeve 10 is disposed in the upper wellbore 91, and the outer diameter of the first sleeve 10 is smaller than the inner diameter of the upper wellbore 91.
When the downhole heat extraction apparatus including the second sleeve 60 as described above is used, as shown in fig. 2, as an embodiment of the present invention, in step S300, the water pump 30 is controlled to operate at a power suitable for the liquid level 83 in the second sleeve to be lower than the upper boundary of the communication hole 61 after the liquid level 83 in the second sleeve is stabilized, and a cavity is formed above the liquid level in the second sleeve 60 so that the gas moves upward to be separated.
The above description is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.
Claims (8)
1. A downhole heat extraction apparatus, comprising: the water pump comprises a water pump, a first sleeve and an extension pipe, wherein end covers are connected to two ends of the first sleeve, a water inlet of the water pump is arranged in the first sleeve, one end of the extension pipe is communicated with the first sleeve, and the other end of the extension pipe is used for extending underground;
the underground heat-taking device comprises a second sleeve and an exhaust pipe, the second sleeve is arranged in the first sleeve, and the water pump is arranged in the second sleeve;
the lower part of the second sleeve is closed, and the upper part of the second sleeve is provided with a communication hole communicated with the first sleeve;
the exhaust pipe is communicated with the upper part of the second sleeve.
2. The downhole heat extraction device of claim 1, wherein the water pump is a submersible pump, and a water outlet of the submersible pump is connected with a water outlet pipe extending out of the first sleeve.
3. The downhole heat removal device of claim 2, wherein the extension tube is made of a thermal insulating material.
4. The downhole heat removal device of claim 2, wherein a first end cap is attached to a lower end of the first sleeve, the first end cap having a tapered threaded bore, the extension tube being attached to the tapered threaded bore.
5. The downhole heat removal device of claim 1, wherein the communication hole is provided in a sidewall of the second sleeve.
6. A downhole heat removal device according to claim 5, wherein the sidewall of the second sleeve is provided with a plurality of communication holes circumferentially spaced around the axis of the second sleeve.
7. The downhole heat removal device of claim 2, wherein a third end cap is connected to an upper end of the second sleeve; the water outlet pipe comprises a first pipe section and a second pipe section, the lower end of the first pipe section is connected to the water outlet of the water pump, and the upper end of the first pipe section is connected to the third end cover;
the lower end of the second pipe section is connected to the third end cover and communicated with the first pipe section, and the upper end of the second pipe section extends out of the first sleeve.
8. A downhole heat extraction method, characterized in that the downhole heat extraction device according to any of claims 1-7 is used, comprising:
s100, drilling according to the designed depth;
step S200, lowering the first sleeve into a well, and enabling the liquid level of still water to be higher than that of the first sleeve;
and step S300, starting the water pump, exploiting formation water in the well, enabling the liquid level in the second sleeve to be lower than the upper boundary of the communication hole, and forming a cavity above the liquid level in the second sleeve.
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| CN112727404A (en) * | 2021-01-19 | 2021-04-30 | 湖北省地质局武汉水文地质工程地质大队 | Heat-preservation water taking structure of middle-deep geothermal well |
| CN115075896B (en) * | 2022-07-11 | 2024-05-28 | 山东省煤田地质局第一勘探队 | Underground geothermal heat taking device for middle and deep layers |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0418572B1 (en) * | 1989-09-16 | 1992-11-25 | IEG Industrie-Engineering GmbH | Device for removing light volatile contaminants from ground water |
| EP0755498B1 (en) * | 1994-05-06 | 1999-01-13 | Geohil Ag | Facility for effecting energy exchange between the ground and an energy exchanger |
| JP2909527B2 (en) * | 1994-06-07 | 1999-06-23 | 平野 豊 | Hot spring heat induction method |
| JPH09256769A (en) * | 1996-03-22 | 1997-09-30 | Shuzo Watanabe | Hot spring pumping method |
| CH691326A8 (en) * | 1996-08-02 | 2001-08-31 | Foralith Ag | METHOD AND DEVICE FOR TAKING WARM DEEP WATER. |
| WO2002012637A1 (en) * | 2000-08-02 | 2002-02-14 | Nishimatsu Construction Co., Ltd. | Underground water pumping device |
| CN1320323C (en) * | 2003-09-27 | 2007-06-06 | 北京北控恒有源科技发展有限公司 | Horizontal-swing type heat exchanger rig in pouring to and sucking back mode for single well |
| CN2718084Y (en) * | 2004-02-26 | 2005-08-17 | 程小虎 | Improved gathering water collecting devcie |
| CN201129308Y (en) * | 2007-12-12 | 2008-10-08 | 辽河石油勘探局 | Diving pump down-hole gas water separation apparatus |
| CN105298867A (en) * | 2014-06-23 | 2016-02-03 | 韩国土水股份有限公司 | Capsule type submersible pump and structure thereof |
| CN104265242B (en) * | 2014-08-09 | 2016-09-07 | 周成杰 | The ground thermal extraction method of geothermal well |
| CN204212705U (en) * | 2014-08-29 | 2015-03-18 | 中国石油化工股份有限公司 | Geothermal well completion tubular column |
| CN206131501U (en) * | 2016-10-21 | 2017-04-26 | 四川省三叶同创能源技术有限公司 | Two GE that increase of geothermol power DIS integration comprehensive development system |
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