CN210714650U - Device for increasing heat exchange area in shallow geothermal energy - Google Patents
Device for increasing heat exchange area in shallow geothermal energy Download PDFInfo
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- CN210714650U CN210714650U CN201921746589.4U CN201921746589U CN210714650U CN 210714650 U CN210714650 U CN 210714650U CN 201921746589 U CN201921746589 U CN 201921746589U CN 210714650 U CN210714650 U CN 210714650U
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Abstract
The utility model discloses an increase heat transfer area device among shallow geothermal energy, bury hole, high pressure fuel pipe, stagnant water packer, high-pressure power unit and water base fracturing fluid tank including ground, bury the hole and arrange treating the rock mass region of breaking, bury the downthehole two stagnant water packers of adopting of pipe and arrange from top to bottom and seal the fracturing point section, in the fracturing point section that the high pressure fuel pipe lower extreme stretched into in the buried pipe, the high pressure fuel pipe outer end was connected to high pressure power unit's play liquid end, and high pressure power unit feed liquor end is connected to water base fracturing fluid tank. The utility model discloses an oil pump is opened the pressurization to shallow geothermal energy region and is produced the crack, and the crack can be to heat transfer area in the increase shallow geothermal energy, improves heat transfer effect, buries the tube hole with beating in the planning region, buries the dual utilization of tube hole (heat transfer and increase crack) with making, greatly reduced economic cost, equipment is simple and easy, and easy operation is swift, can realize the recovery of high-pressure oil pipe way moreover, pollution abatement.
Description
Technical Field
The utility model relates to an increase heat transfer area device among shallow geothermal energy belongs to shallow geothermal energy technical field.
Background
The geothermal energy is widely concerned by people with the advantages of energy conservation, environmental protection and the like under the current great trend of seeking economic, energy conservation, low carbon and environmental protection, and the shallow geothermal energy is used as a clean renewable energy source and is a new energy source vigorously explored and developed by the nation. So-called geothermal energy, which is energy from the inside of the earth, is very powerful, and the amount of heat stored in the inside of the earth is about 1.7 hundred million times the global coal reserves, and the amount of heat per year from the inside of the earth through the earth's surface is about 1000 million barrels of oil equivalent. Shallow geothermal energy is an important component of earth thermal energy, and generally refers to low-temperature geothermal resources which are located below a temperature-changing layer of the earth surface and are stored in rock-soil bodies in the shallow part of the earth crust. Among new energy and renewable energy, shallow geothermal energy is a new energy which is competitive in line with the current trend, and has a very important meaning.
However, various complications are inevitably encountered in the development and utilization of the shallow geothermal energy. Wherein, when water is used as a medium to carry out the heat exchange process underground, the effective heat exchange area directly influences the utilization efficiency of geothermal energy. The research work of the geological foundation of shallow geothermal energy in China is lagged, and the shallow geothermal energy is not late to start in China. In fact, how well the shallow geothermal energy develops depends on how well the geological conditions are studied. At present, China is about to meet the climax of development and utilization of shallow geothermal energy, and a large number of professional teams capable of researching the structure and the heat exchange effect of the shallow geothermal energy are needed, so that the construction scheme of the project can be determined more reasonably according to the heating area in the design process.
At present, the research on the heat exchange area in the development and utilization of geothermal energy in China is less audible. Some researchers have proposed the use of blasting to increase the fractures, thereby increasing the permeability of the rock mass and improving the heat transfer characteristics. However, in the development of geothermal energy, almost all the engineering works are used as large air conditioners (for indoor temperature rise and temperature reduction), so the engineering works are built in dense building group areas, and if a blasting method is applied to increase the heat exchange area, the stability of the engineering body is greatly influenced. There have also been some researchers who have proposed the use of chemical (HCL) reactions with rock mass to increase the permeability of the rock mass and thereby increase the area of the change face. However, the method has the biggest problems of polluting underground water quality and being greatly influenced by the chemical properties of underground rock mass.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the utility model provides an increase heat transfer area device among shallow geothermal energy to solve the problem that exists among the above-mentioned prior art.
The utility model discloses the technical scheme who takes does: the utility model provides an increase heat transfer area device in shallow geothermal energy, buries the pipe hole including ground, high pressure fuel pipe, stagnant water packer, high-pressure pumping station and water base fracturing fluid tank, buries the pipe hole and arranges treating the rock mass regional of breaking, adopts two stagnant water packers to arrange sealed fracturing point section from top to bottom in the buried pipe hole, and high pressure fuel pipe lower extreme stretches into in the fracturing point section in the buried pipe hole, and high pressure fuel pipe outer end is connected to high-pressure pumping station's play liquid end, and high-pressure pumping station feed liquor end is connected to water base fracturing fluid tank.
Preferably, the high-pressure oil pipe is provided with a flowmeter.
Preferably, a derrick is installed at the orifice of the buried pipe hole, and the derrick suspends the high-pressure oil pipe.
Preferably, the device for increasing the heat exchange area in shallow geothermal energy further comprises a testing well hole, and the testing well hole is 5m away from the buried pipe hole.
Preferably, the high-pressure pump station is connected to a console, and the console is further connected with a flow meter and a data acquisition terminal.
The utility model has the advantages that: compared with the prior art, the utility model discloses an oil pump, open the pressurization to shallow geothermal energy region and produce the crack, the crack can be to heat transfer area in the increase shallow geothermal energy, improve heat transfer effect, bury the tube hole with beating in the planning region, make and bury the dual utilization of tube hole (heat transfer and increase crack), greatly reduced economic cost, equipment is simple and easy, and easy operation is swift, and can realize the recovery of high-pressure oil pipe way, and pollution reduction, adopt the proppant to make the crack that produces reliable, difficult sealing, heat transfer effect improves obviously, it is little to neighbouring architectural equipment influence.
Drawings
FIG. 1 is a schematic diagram of the hydraulic jet cracking heat exchange area increasing device of the present invention;
fig. 2 is a schematic diagram of the device used in the field.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in fig. 1-2, the device for increasing the heat exchange area in shallow geothermal energy comprises a buried pipe hole 1, a high-pressure oil pipe 2, water-stop packers 3, a high-pressure pump station 5 and a water-based fracturing fluid tank 7, wherein the buried pipe hole 1 is arranged in a region to be fractured by a rock body, two water-stop packers 3 are arranged in the buried pipe hole 1 up and down to form a closed fracturing point section, the lower end of the high-pressure oil pipe 2 extends into the fracturing point section in the buried pipe hole 1, the outer end of the high-pressure oil pipe 2 is connected to the liquid outlet end of the high-pressure pump station 5, and the liquid inlet end of the high-pressure.
Preferably, the high pressure fuel pipe 2 is provided with a flowmeter 6.
Preferably, a derrick 4 is installed at the opening of the buried pipe hole 1, and the derrick 4 suspends the high-pressure oil pipe 2.
Preferably, the device for increasing the heat exchange area in shallow geothermal energy further comprises a test well hole 11, and the test well hole 11 is 5m away from the buried pipe hole.
Preferably, the high-pressure pumping station 5 is connected to a control console 8, and the control console 8 is also connected with a flow meter 6 and a data acquisition terminal 9.
Example 2: in a certain shallow geothermal energy development and utilization project in Qing and Zhen cities of Guizhou province, a buried pipe region planned for underground heat exchange meets dense carbonate rocks due to complex geological conditions under the Karster landform of the Guizhou province. Therefore, the underground water is difficult to circulate, and the heat exchange effect is poor. The underground rock mass in the region needs to be transformed (the underground heat exchange area is increased), and the heat exchange effect is improved.
In view of the above situation, the present invention provides an operation method of a device for increasing heat exchange area in shallow geothermal energy, comprising the following steps:
(1) the hydrogeological condition of an engineering rock mass is known, and the magnitude (by geological drilling and coring, experimental test) and direction of the crustal stress in the rock mass near a fracturing area are mastered through early geophysical data (fissures of underground rock mass, water system development and temperature field distribution);
(2) drilling buried pipe holes 1 in a planned region to be fractured of the rock mass, wherein the space between the buried pipe holes is 5m, and the diameter of the buried pipe holes is 10 cm;
(3) installing a high-pressure oil pipe 2 and a water-stop packer 3 in an underground pipe hole 1, erecting a derrick 4, a high-pressure pump station 5, a flowmeter 6, a water-based fracturing fluid tank 7, a control console 8 and a data acquisition terminal 9 thereof on the ground, and measuring the pressure of each characteristic point (the hydraulic pressure in the high-pressure pump is the rock fracture pressure) and the fracture direction (the judgment is carried out by the movement direction of the water-based fracturing fluid) in the fracturing process;
(4) sealing the upper and lower positions of a fracturing point into a fracturing point section by using a water-stop packer 3, and extending a high-pressure oil pipe 2 into the fracturing point section;
(5) starting the high-pressure pump station 5, conveying water-based fracturing fluid to a high-pressure oil pipeline in the buried pipe hole 1 through a high-pressure pump of the high-pressure pump station 5, mixing proppant in the water-based fracturing fluid, and gradually increasing the pressure of the high-pressure pump to break rock mass;
(6) recording the reading of a pump pressure table on the high-pressure pump station 5 in the fracturing process, and calculating the magnitude and direction parameters of the crustal stress in the rock mass near the measuring point (through the hydraulic pressure in the high-pressure pump and the buried depth of the fracturing position);
(7) stopping pressurizing when fracturing is finished, gradually reducing the pressure of the high-pressure pump, and closing the high-pressure pump when the propping agent completely enters cracks generated by fracturing;
(8) recovering the high-pressure oil pipe, and detecting the development condition (the movement and distribution condition of the fracturing fluid of the water machine) of the rock fracturing fracture 12 in the test well hole 11;
and after the fracturing is finished, detecting the development condition, the heat exchange effect and the like of the underground fracture in the area. After the construction is finished, the detection result shows that the heat exchange effect of the underground rock mass in the area is obviously improved. Generally, rocks with a hardness of grade IV belong to moderately strong rocks, and rocks with a hardness of above and below the grade are also constructed by applying the method of the present invention.
The method for increasing the heat exchange area by hydraulic jet fracturing in shallow geothermal energy has the advantages of obvious effect of increasing the heat exchange area, simple and convenient construction, resource saving, guarantee for construction safety and wide application range.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention, therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (5)
1. The utility model provides an increase heat transfer area device in shallow geothermal energy which characterized in that: the underground water-based fracturing fluid tank comprises an underground pipe hole (1), a high-pressure oil pipe (2), water-stop packers (3), a high-pressure pump station (5) and a water-based fracturing fluid tank (7), wherein the underground pipe hole (1) is arranged in a region to be fractured by a rock body, two water-stop packers (3) are arranged in the underground pipe hole (1) from top to bottom to seal a fracturing point section, the lower end of the high-pressure oil pipe (2) extends into the fracturing point section in the underground pipe hole (1), the outer end of the high-pressure oil pipe (2) is connected to a liquid outlet end of the high-pressure pump station (5), and a liquid inlet end of the high-pressure.
2. The device for increasing the heat exchange area in the shallow geothermal energy according to claim 1, wherein: the high-pressure oil pipe (2) is provided with a flowmeter (6).
3. The device for increasing the heat exchange area in the shallow geothermal energy according to claim 1, wherein: a derrick (4) is installed at the orifice of the buried pipe hole (1), and the high-pressure oil pipe (2) is suspended by the derrick (4).
4. The device for increasing the heat exchange area in the shallow geothermal energy according to claim 1, wherein: the underground pipe further comprises a testing well hole (11), and the testing well hole (11) is 5 meters away from the underground pipe hole (1).
5. The device for increasing the heat exchange area in the shallow geothermal energy according to claim 1, wherein: the high-pressure pump station (5) is connected to a control console (8), and the control console (8) is further connected with a flow meter (6) and a data acquisition terminal (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921746589.4U CN210714650U (en) | 2019-10-17 | 2019-10-17 | Device for increasing heat exchange area in shallow geothermal energy |
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| CN201921746589.4U CN210714650U (en) | 2019-10-17 | 2019-10-17 | Device for increasing heat exchange area in shallow geothermal energy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566175A (en) * | 2019-10-17 | 2019-12-13 | 贵州大学 | Device for increasing heat exchange area in shallow geothermal energy and operation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566175A (en) * | 2019-10-17 | 2019-12-13 | 贵州大学 | Device for increasing heat exchange area in shallow geothermal energy and operation method thereof |
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