CN215724245U - Deep geothermal collecting well - Google Patents
Deep geothermal collecting well Download PDFInfo
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- CN215724245U CN215724245U CN202121845327.0U CN202121845327U CN215724245U CN 215724245 U CN215724245 U CN 215724245U CN 202121845327 U CN202121845327 U CN 202121845327U CN 215724245 U CN215724245 U CN 215724245U
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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
A deep geothermal collection well comprising at least a first butt well and a second butt well; the first butt well comprises a straight well section, an inclined well section and a horizontal heat exchange well section which are sequentially communicated; the bottom of the second butt joint well is communicated with the horizontal heat exchange well section; the horizontal well section is located in a geological formation having a temperature of at least above 110 ℃. This application sets up horizontal heat transfer well section through the deep layer in the ground bottom at two butt joint wells, increases the heat transfer area of heat transfer medium in the ultra-deep well underground, has improved heat exchange efficiency, has realized the collection of clean heat energy in the underground.
Description
Technical Field
The application relates to a deep geothermal energy collection well, which belongs to the field of heat energy collection.
Background
The utilization of the heat energy of the ground bottom is always the hot door direction of energy utilization, and the underground heat energy utilization has the advantages that: even in the area without underground hot water, as long as the ground temperature gradient is abnormal, high-temperature rock mass exists in a certain depth underground, and heat energy can be brought to the ground for use by utilizing heat exchange media such as underground water and the like, such as heating and the like.
How to realize the exchange and use of terrestrial heat is one of the urgent needs of the modern society.
SUMMERY OF THE UTILITY MODEL
According to one aspect of the application, a deep geothermal collecting well is provided, which uses a heat exchange medium to circularly and continuously extract underground heat energy through the deep butt joint of the ground bottom of a butt joint well.
The deep geothermal collection well comprises at least a first butt well and a second butt well;
the first butt well comprises a straight well section, an inclined well section and a horizontal heat exchange well section which are sequentially communicated;
the bottom of the second butt joint well is communicated with the horizontal heat exchange well section;
the horizontal heat exchange well section is located in a geological formation having a temperature of at least above 110 ℃.
Optionally, the second butt well is a vertical well;
preferably, the second butt well comprises a large diameter section and a small diameter section;
the large-diameter section is communicated with the horizontal heat exchange well section, and the diameter of the large-diameter section is larger than that of the horizontal heat exchange well section.
Optionally, the length of the second horizontal heat exchange well section is 1000-2000 m.
Optionally, the diameter of the horizontal heat exchange well section is smaller than the diameter of the first butt well, the straight well section and the inclined well section.
Optionally, the diameter of the horizontal heat exchange well section is 190-250 mm.
This application is through the injecing to horizontal heat transfer well section diameter and length for whole collection well shaft structure is "both ends are thin, and the centre is thick" characteristics, and the collection well has longer heat transfer section, thereby has increased the heat transfer time, has improved heat transfer area, and then has improved heat exchange efficiency.
Optionally, casings are arranged in the second butt joint well, the straight well section, the inclined well section and the horizontal heat exchange well section;
the sleeves are connected in a sealing way;
and a gap is reserved between the casing pipes of the inclined shaft section and the horizontal heat exchange shaft section and the shaft wall.
Optionally, the well depth of each of the first and second docking wells is greater than 3000 m.
Optionally, the depth of the first docking well is greater than the depth of the horizontal heat exchange well section.
Specifically, the bottom of the first butt-joint well still extends towards the ground bottom after being in butt joint communication with the horizontal heat exchange well section to form a sand setting bag. If the horizontal section is a barefoot well, the heat exchange medium is inevitably scoured against the well wall in the process of entering the stratum for heat exchange, so that rock debris falls off and is deposited at the bottom of the first butt-joint well, so that the collection well is blocked; if the horizontal section is not open hole, impurities carried in the heat exchange medium can also block the well. Therefore, the arrangement of the sand-settling bag can ensure the normal use of the well and prolong the service life of the well. Preferably, the depth of the first docking well is at least 150m deeper than the depth at which the horizontal heat exchange well section is located.
Optionally, the outer wall of the well mouth of each of the first butt well and the second butt well is provided with an insulating jacket layer.
Optionally, the jacket length of the second docking well is greater than the jacket length of the first docking well.
The beneficial effects that this application can produce include:
1) the application provides a deep geothermal energy collection well, at the bottom that accords with the heat transfer condition, through set up horizontal heat transfer well section between two butt joint wells, increase the heat transfer area of heat transfer medium underground again, improved heat exchange efficiency, realized the collection of clean heat energy in underground.
2) The application provides a deep geothermal energy collection well through length and diameter to horizontal heat transfer well section to and the second is to the injecing of well depth for increased heat transfer medium dwell time and heat transfer area at the bottom of the earth, improved heat energy collection efficiency.
3) The application provides a deep geothermal energy collection well, through set up the sleeve pipe in the well, heat transfer medium flows in the intraductal, has avoided the pollution that heat energy collection probably brought the stratum.
4) The application provides a deep geothermal collection well through at the well head section, especially as the second butt joint well induction zone of liquid outlet, sets up the heat preservation jacket layer, has reduced the thermal loss after gathering.
Drawings
Fig. 1 is a schematic diagram of a deep geothermal collection well according to one embodiment of the present disclosure.
List of parts and reference numerals:
1. a first docking well; 1-1, a straight well section; 1-2, inclined shaft section; 1-3, horizontal heat exchange well section; 2. a second butt well; 2-1, small diameter section; 2-2, a large-diameter section; 3. a sleeve; 4. provided is a heat-insulating sleeve.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
The application relates to a deep geothermal collecting well, as shown in figure 1, comprising a first butt well 1 and a second butt well 2;
the first butt well 1 comprises a straight well section 1-1, an inclined well section 1-2 and a horizontal heat exchange well section 1-3 which are sequentially communicated.
The bottom of the second butt joint well is communicated with the horizontal heat exchange well section;
the horizontal well section is located in a geological formation having a temperature of at least above 110 ℃.
By arranging the inclined shaft sections 1-2, on one hand, based on drilling requirements, a completely vertical right-angle well cannot be formed by normal underground well connection; on the other hand, the contact area of the heat exchange medium and the ground heat can be increased through the arc-shaped inclined shaft section, so that the heat exchange is increased; the arc inclined shaft section can play a buffering role in the heat exchange medium of the direct injection well, and the damage of the well casing caused by the direct impact of the heat exchange medium on the horizontal heat exchange shaft section 1-3 is avoided.
Specifically, in the implementation process, the first butt-jointed well 1 is preferably an injection well, and the second butt-jointed well 2 is preferably an outlet well, so that the second butt-jointed well 2 may be a vertical well, and may also have the same structure as the first butt-jointed well 1. Preferably, the second butt well comprises a large diameter section 2-2 and a small diameter section 2-1;
the large-diameter section 2-2 is communicated with the horizontal heat exchange well section 1-3, and the diameter of the large-diameter section 2-2 is larger than that of the horizontal heat exchange well section 1-3.
In order to ensure that the heat exchange medium can fully exchange heat at the ground bottom and collect terrestrial heat, in the implementation process of the application, the length of the horizontal heat exchange well section is 1000-2000 m, and preferably the length of the horizontal heat exchange well section is 1500 m.
Meanwhile, in order to increase the heat exchange area of the horizontal section of the ground bottom, the diameter of the horizontal heat exchange well section is 190-250 mm, and preferably, the diameter of the horizontal heat exchange well section is 215.9 mm.
In this application implementation, in the inclined shaft section of first butt joint well 1 and horizontal heat transfer well section can be the open hole, can heat transfer medium like this with the ground bed direct contact, improved heat exchange efficiency, increased heat transfer area. Because the adopted heat exchange media are different, especially when the heat exchange media are non-aqueous liquids, the pollution to the ground environment can be caused, therefore, preferably, the second butt-jointed well, the straight well section, the inclined well section and the horizontal heat exchange well section are all provided with the casing pipes 3;
the sleeves 3 are connected in a sealing way;
and a gap is reserved between the casing 3 of the inclined shaft section 1-2 and the horizontal heat exchange shaft section 1-3 and the well wall.
The gap between the sleeve and the well wall can provide expansion deformation allowance for the heat exchange process of the pipeline, and the sleeve is prevented from being broken due to the fact that rock strata excessively extrude the pipe wall.
In order to avoid the influences on heat energy collection caused by the fact that the ground bottom heat energy conditions are possibly unevenly distributed and the geological structure of the shallow bottom layer is unstable under different geological conditions and to effectively collect the ground bottom heat energy, in the implementation process of the application, the well depths of the first butt-joint well 1 and the second butt-joint well 2 are both larger than 3000m, namely the depths of the horizontal heat exchange well sections 1-3 of the first butt-joint well 1 are larger than 3000 m.
In the implementation process of the application, the depth of the second butt-joint well 2 is greater than the depth of the horizontal heat exchange well sections 1-3. The depth of the second butt-joint well 2 is larger than the depth of the horizontal heat exchange well sections 1-3, so that the heat exchange efficiency can be further increased.
In order to reserve the exchanged heat energy as much as possible, in the implementation process of the application, the outer walls of the well mouths of the first butt-joint well and the second butt-joint well are provided with heat insulation jacket layers 4.
Preferably, the jacket length of the second butt well is greater than the jacket length of the first butt well. Specifically, the heat preservation jacket layer adopts the polyurethane heat preservation, the thickness of heat preservation jacket layer is 20 ~ 40mm, preferably, the thickness of heat preservation jacket layer is 300 mm.
According to one embodiment of the application, the distance between a first butt joint well 1 and a second butt joint well 2 is 2200m, the diameter of a straight well section 1-1 of the first butt joint well 1 is 311.1mm, the diameter of an arc inclined well section 1-2 is 250mm, and the diameter of a horizontal heat exchange well section 1-3 is 215.9 mm; the length of the flat heat exchange well section is 1500m, and the sum of the horizontal lengths of the flat heat exchange well section and the inclined well section is 2200 m.
The diameter of the large diameter section of the second butt well 2 is 250mm, and the diameter of the small diameter section is 178 mm. The diameter of the large-diameter section of the second butt-joint well 2 is larger than that of the flat heat exchange well section.
The bottom of the first butt-joint well is positioned at the depth of +150m of the horizontal heat exchange well section.
The outer walls of the well mouths of the first butt joint well 1 and the second butt joint well 2 are sleeved with sleeves with inner diameters larger than the well mouths, and polyurethane is filled between the inner walls of the sleeves and the outer walls of the well mouths to form a polyurethane heat-insulating layer with the thickness of 30 mm.
During construction, drilling is carried out, a straight well section 1-1, an inclined well section 1-2 and a horizontal heat exchange well section 1-3 of a first butt joint well 1 are sequentially formed, and then a second butt joint well 2 is drilled, so that a well way is in butt joint with the horizontal heat exchange well section 1-3.
When geothermal energy is collected, a heat exchange medium is injected from a wellhead of a first butt well 1, the heat exchange medium exchanges heat with a horizontal heat exchange well section 1-3 through an inclined well section 1-2 and then gushes out from a wellhead of a second butt well 2, the second butt well 2 is communicated with a heat utilization system heat exchanger, and heat energy exchanged by the heat exchanger enters a heat utilization system pipe network; and after heat exchange is carried out in the heat exchanger, the heat exchange medium is injected into the first butt-joint well 1 again for circulating heat exchange, so that circulating collection and application of underground heat energy are realized.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (11)
1. A deep geothermal collection well, comprising at least a first butt well and a second butt well;
the first butt well comprises a straight well section, an inclined well section and a horizontal heat exchange well section which are sequentially communicated;
the bottom of the second butt joint well is communicated with the horizontal heat exchange well section;
the horizontal heat exchange well section is located in a geological formation having a temperature of at least above 110 ℃.
2. A deep geothermal collection well according to claim 1, wherein the second butt well is a vertical well.
3. The deep geothermal collection well of claim 1, wherein the second docking well comprises a major diameter section and a minor diameter section;
the large-diameter section is communicated with the horizontal heat exchange well section, and the diameter of the large-diameter section is larger than that of the horizontal heat exchange well section.
4. The deep geothermal collection well of claim 1, wherein the horizontal heat exchange well section has a length of 1000 to 2000 m.
5. The deep geothermal collection well of claim 1, wherein the horizontal heat exchange well section has a diameter of 190-250 mm.
6. The deep geothermal collection well of claim 1, wherein a casing is disposed within each of the second butt well, the straight well section, the deviated well section, and the horizontal heat exchange well section;
the sleeves are connected in a sealing way;
and a gap is reserved between the casing pipes of the inclined shaft section and the horizontal heat exchange shaft section and the shaft wall.
7. A deep geothermal collection well according to claim 1, wherein the first and second butt wells each have a well depth of greater than 3000 m.
8. A deep geothermal collection well according to claim 1, wherein the first butt well is at a depth greater than the depth at which the horizontal heat exchange well section is located.
9. A deep geothermal collection well according to claim 1, wherein the wellhead outer walls of the first and second butt wells are each provided with an insulating jacket.
10. A deep geothermal collection well according to claim 1, wherein the jacket length of the second butt well is greater than the jacket length of the first butt well.
11. The deep geothermal collection well of claim 1, wherein the horizontal heat exchange well section has a diameter less than a diameter of the first butt well, the straight well section, and the deviated well section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121845327.0U CN215724245U (en) | 2021-08-09 | 2021-08-09 | Deep geothermal collecting well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121845327.0U CN215724245U (en) | 2021-08-09 | 2021-08-09 | Deep geothermal collecting well |
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| Publication Number | Publication Date |
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| CN215724245U true CN215724245U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121845327.0U Active CN215724245U (en) | 2021-08-09 | 2021-08-09 | Deep geothermal collecting well |
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| CN (1) | CN215724245U (en) |
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2021
- 2021-08-09 CN CN202121845327.0U patent/CN215724245U/en active Active
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