CN111577279B - Coal-geothermal water collaborative mining method based on collapse column water guide channel - Google Patents
Coal-geothermal water collaborative mining method based on collapse column water guide channel Download PDFInfo
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- CN111577279B CN111577279B CN202010416827.6A CN202010416827A CN111577279B CN 111577279 B CN111577279 B CN 111577279B CN 202010416827 A CN202010416827 A CN 202010416827A CN 111577279 B CN111577279 B CN 111577279B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
Abstract
The invention discloses a coal-geothermal water collaborative mining method based on a water guide channel of a collapse column, which is used for carrying out geothermal mining by taking the water guide channel between the collapse column and a geothermal reservoir as a geothermal water gathering area while mining coal. And establishing a heat energy exchange station in a tunnel and a chamber formed by the gob-side entry retaining after the working face is mined, excavating a geothermal well through the drilling chamber, respectively arranging geothermal water extraction pipelines to the geothermal water collection area, and arranging tail water reinjection pipelines to the geothermal reservoir, wherein the tail ends of the geothermal water extraction pipelines and the tail water reinjection pipelines are at a certain distance. The geothermal water is pumped to a heat energy exchange station through a geothermal water pumping pipeline, and the heat energy is pumped and then is conveyed to the ground for utilization; after heat is taken, the heat is reinjected to a geothermal reservoir through a tail water reinjection pipeline so as to control the stability of a rock stratum and realize the sustainable exploitation of geothermal water. Meanwhile, coal mining can be simultaneously carried out on the next working face, and coal-geothermal water collaborative mining is realized. The mining method has the advantages of high resource utilization rate, low geothermal water mining cost, changing the harm of the water guide channel around the collapse column into the benefit and the like.
Description
Technical Field
The invention relates to a coal and geothermal exploitation method, in particular to a coal-geothermal water collaborative exploitation method based on a collapse column water guide channel, and belongs to the field of underground resource exploitation.
Background
The coal resources in China are abundant in reserves and wide in distribution, and the efficient exploitation and utilization of the coal can make a great contribution to the energy supply in China. In recent years, the coal mining depth is increased year by year, and new technical problems such as high ground temperature of mines are brought along with the increase of the coal mining depth. In order to solve the exploitation problem caused by high ground temperature, the exploitation of the ground heat becomes a hot research subject based on the concept of high-efficiency utilization of resources, and the exploitation technology and concept are continuously perfected and developed. Therefore, the students propose a coal-geothermal water collaborative mining method to realize high-efficiency multiple utilization of resources.
The collapse column is a widely-existing geological structure in the mining area of China. Rock mass around the collapse column is loose and broken, a natural water-guiding fracture network exists, and then the influence of deep high ground stress and mining disturbance is added, so that a water-bearing stratum and a coal mining operation space are probably communicated, water inrush disasters of a mine are caused, and casualties and property loss are caused. Thus, existing geothermal mining methods are generally selected in areas away from the collapse column.
A large amount of geothermal energy is stored in a deep rock body, the water temperature of a water-bearing stratum can reach 60-80 ℃, and the geothermal energy is clean and abundant energy. In order to efficiently develop geothermal resources and reduce the risk of water inrush disasters, the invention provides a coal-geothermal water collaborative mining method based on a water guide channel of a collapse column by fully utilizing the water guide characteristic of the collapse column surrounding rock, which can cyclically mine underground thermal energy resources, reduce the construction cost of projects, reduce the risk of inducing water inrush disasters by the collapse column and realize efficient development and utilization of resources.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a coal-geothermal water collaborative mining method based on a collapse column water guide channel. By utilizing the characteristics of rock mass breakage and water flow channel existence around the collapse column, geothermal water in a geothermal reservoir can be conducted to extract geothermal heat, meanwhile, the pressure of a water-bearing stratum is relieved, the water inrush risk of a coal face is reduced, coal-geothermal water collaborative exploitation is completed, and multiple high-efficiency utilization of resources is realized.
In order to achieve the purpose, the invention discloses a coal-geothermal water collaborative mining method based on a water guide channel of a collapse column, which comprises the following steps:
step 1, determining a geothermal water gathering area formed by a water flowing crack of a collapse column touching a geothermal reservoir according to mine geological data.
The collapse column has natural water flowing cracks, when the water flowing cracks touch the geothermal reservoir, a water flowing channel is formed, geothermal water is continuously gathered to the collapse column, and a geothermal water gathering area is formed at the junction of the collapse column and the geothermal reservoir. The location of the geothermal water collection area can be determined according to mine geological data. Meanwhile, geothermal water in the geothermal water collecting area is extracted to relieve the pressure of the geothermal reservoir, so that the risk of water inrush accidents caused by collapse columns is reduced.
Step 2, arranging a coal mining system and mining coal:
arranging a main well, an auxiliary well and an air well according to the occurrence characteristics of the coal bed; digging a transportation main roadway, a track main roadway and an air return main roadway in a mining level, arranging a mining area, and arranging a coal face in the mining area; in coal face extraction, reserving section roadways in a gob-side entry retaining mode; after coal mining, the coal is transported to the ground through a main transportation roadway and a main well.
Step 3, setting a heat energy exchange station:
the heat energy exchange station is established in a roadway reserved along a gob-side entry after the coal face with a certain safety distance from the collapse column is mined, and the heat energy exchange station and the collapse column keep a set safety distance. And a heat energy exchange device is arranged in the heat energy exchange station. Due to the design, the drilling construction passes through the weak loose rock mass around the collapse column, so that the construction difficulty of drilling arrangement can be reduced; and the geothermal water extraction pipeline does not need to extend into the geothermal reservoir, so that the pipeline distance is shortened, the quantity of capital construction work can be reduced, and the cost of drilling and pipeline arrangement is saved.
Step 4, establishing a geothermal water extraction and heat energy transmission system and extracting geothermal water:
the geothermal water extraction and heat energy transmission system comprises: arranging a drilling chamber in a roadway or chamber reserved along a gob-side entry retaining of the previous working face of the current mining working face, and respectively excavating a geothermal well to a geothermal water collection area and a geothermal reservoir by the drilling chamber; arranging a geothermal water extraction pipeline to the geothermal water collection area through a geothermal well, and arranging a tail water reinjection pipeline to a geothermal reservoir; the geothermal water extraction pipeline is away from the tail end of the tail water reinjection pipeline by a set distance; the geothermal water extraction pipeline is connected with a heat supply side intake pipe of heat energy exchange equipment of the heat energy exchange station, and geothermal water in a geothermal reservoir is extracted to the heat energy exchange equipment; the tail water reinjection pipeline is connected with a water outlet pipe on the heat supply side of the heat energy exchange equipment, and the geothermal water is reinjected into the geothermal reservoir after heat exchange; drilling a hole from the ground to the heat energy exchange station, arranging a heat energy transmission pipeline and a water return pipeline in the hole, connecting the water return pipeline with a heat exchange side water inlet pipe of heat energy exchange equipment, connecting a heat exchange side water outlet pipe of the heat energy exchange equipment with the heat energy transmission pipeline, and transmitting geothermal energy to the ground through the heat energy transmission pipeline after heat exchange by the heat energy exchange equipment of the heat energy exchange station; meanwhile, the coal mining operation of the next working face is continued, and the coal is transported through the transportation tunnel and lifted to the ground through the main well, so that the coal-geothermal water collaborative mining is realized.
In the geothermal water extraction system, geothermal water is extracted from a heat source in a geothermal water collection area and is transported to a heat energy exchange station through a geothermal water extraction pipeline; after the heat energy in the geothermal water is transferred and stored in the heat energy exchange station, the heat energy is directly transmitted to the ground through a heat energy transmission pipeline for utilization; tail water output by the heat energy exchange station is reinjected to the geothermal reservoir through a tail water reinjection pipeline so as to ensure the stability of the geothermal reservoir; the re-injected tail water flows to the heat energy collecting area again through the heating of the geothermal reservoir, so that a heat source is supplemented, and the cyclic exploitation and utilization of geothermal water are realized.
The geothermal water extraction system further comprises a geothermal reservoir detection system, and the system comprises a geothermal water level monitoring device, a geothermal water temperature monitoring device, a geothermal water pressure monitoring device and a geothermal reservoir displacement monitoring device.
The invention provides a coal-geothermal water collaborative mining method based on a water guide channel of a collapse column, aiming at the technical problem faced by development and utilization of coal-geothermal resources containing a geological structure of the collapse column. Due to the fact that large-range fractured zone rock masses are formed around the collapse columns, formation of geothermal water collection areas between the geothermal reservoir and the collapse columns is promoted. By adopting the technical scheme, the invention can fully utilize the high permeability of the geothermal water gathering area and the weakness of the rock mass in the fractured zone, establish the heat exchange station in the roadway of the upper working face, extract the geothermal water through the geothermal water extraction pipeline and the tail water reinjection pipeline, realize the coal-heat synergistic efficient exploitation and utilization, and simultaneously can continuously relieve the pressure of the geothermal reservoir, reduce the risk of water inrush induced by the collapse column and turn the harm into the benefit.
The invention has the following advantages:
1. and the roadway of the gob-side entry retaining of the coal face is used as a heat collecting space, so that coal-heat collaborative mining is realized.
2. Geothermal water gathering areas formed by seepage channels between the collapse columns and geothermal reservoirs are used as heat sources for geothermal water exploitation, geothermal water can flow and be stored conveniently, and the extraction efficiency is improved.
3. The danger of water inrush accidents caused by the collapse column is solved. The extraction of high-temperature water in the geothermal reservoir has a certain pressure relief effect on the geothermal reservoir, reduces the risk of water bursting disasters of the collapse column, and turns the harm of the collapse column water guide channel into benefit.
4. The heat exchange station is established in the working face roadway, the transmission distance of geothermal water is greatly shortened, and meanwhile, the loose type of rock mass around the collapse column is utilized, so that the difficulty of excavation of the geothermal well and the engineering quantity of pipeline arrangement are reduced, the cost is saved, and the heat energy loss is reduced.
Drawings
FIG. 1 is a schematic diagram of a mining system of a coal-geothermal water collaborative mining method based on a collapse column water guide channel;
in the figure: 1-geothermal water gathering area, 2-main well, 3-auxiliary well, 4-air well, 5 transportation main lane, 6-track main lane, 7-return air main lane, 8-waterproof coal pillar, 9 upper working face, 10-heat energy exchange station, 11-tail water reinjection pipeline, 12-geothermal water extraction pipeline, 13-geothermal reservoir, 14-heat energy transmission pipeline, 15-return water pipeline, 16-collapse column and 17-next working face.
Detailed Description
The present invention will be described in further detail with reference to the following specific embodiments and the accompanying drawings.
As shown in fig. 1, the mining system of the coal-geothermal water collaborative mining method based on the water guide channel of the collapse column mainly comprises an geothermal water gathering area, a coal mining system, a heat energy exchange station, an geothermal water extraction and heat energy transmission system, wherein all modules are mutually connected and jointly operated to realize multiple mining and utilization of coal-geothermal water.
The invention relates to a coal-geothermal water collaborative mining method based on a collapse column water guide channel, which comprises the following steps:
step 1, determining a geothermal water gathering area 1 formed by a collapse column water flowing crack contacting a geothermal reservoir according to mine geological data.
The collapse column 16 has natural water flowing cracks, when the water flowing cracks touch the geothermal reservoir 13, a water flowing channel is formed, geothermal water is continuously gathered to the collapse column, and a geothermal water gathering area 1 is formed at the junction of the collapse column and the geothermal reservoir. The location of the geothermal water collection area can be determined according to mine geological data. Meanwhile, geothermal water in the geothermal water collecting area is extracted to relieve the pressure of the geothermal reservoir, so that the risk of water inrush accidents caused by collapse columns is reduced.
Step 2, arranging a coal mining system and mining coal:
according to the occurrence characteristics of the coal seam, a main well 2, an auxiliary well 3 and an air shaft 4 are reasonably arranged; digging a transportation main lane 5, a track main lane 6 and an air return main lane 7 in the mining level, arranging a mining area, and arranging a coal face in the mining area; in coal face extraction, reserving section roadways in a gob-side entry retaining mode; after coal mining, the coal is transported to the ground through a main transportation roadway 5 and a main well 2.
Step 3, setting a heat energy exchange station:
the heat energy exchange station 10 is built in a roadway reserved along a gob-side entry after the coal face 9 is mined and has a certain safety distance from the collapse column 16, and heat energy exchange equipment is arranged in the heat energy exchange station 10. By the design, the heat energy exchange station 10 and the collapse column 16 are away from one relatively safe position, meanwhile, drilling construction passes through soft loose rock mass around the collapse column 16, the construction difficulty of drilling arrangement can be reduced, the geothermal water extraction pipeline 12 does not need to extend into a geothermal reservoir, the pipeline distance is shortened, the quantity of capital construction work can be reduced, and the cost of drilling and pipeline arrangement is saved.
Step 4, establishing a geothermal water extraction and heat energy transmission system and extracting geothermal water:
the geothermal water extraction and heat energy transmission system is characterized in that a drilling chamber is arranged in a roadway or chamber reserved along a gob-side entry retaining way on the last working face 9 of the currently mined working face 17, and geothermal wells are respectively excavated to a geothermal water collection area 1 and a geothermal reservoir 13; arranging a geothermal water extraction pipeline 12 to the geothermal water collection area 1 through a geothermal well, and arranging a tail water reinjection pipeline 11 to a geothermal reservoir arrangement 13; the geothermal water extraction pipeline 12 is away from the tail end of the tail water reinjection pipeline 11 by a set distance; the geothermal water extraction pipeline 12 is connected with a heat supply side intake pipe of heat energy exchange equipment of the heat energy exchange station 10, and extracts geothermal water in the geothermal reservoir 13 to the heat energy exchange equipment; the tail water reinjection pipeline 11 is connected with a water outlet pipe on the heat supply side of the heat energy exchange equipment, geothermal water is reinjected into the geothermal reservoir 13 after heat exchange so as to ensure the stability of the geothermal reservoir 13, the reinjected tail water flows to the geothermal water collecting area 1 again through the heating of the geothermal reservoir 13, a heat source is supplemented, and the cyclic exploitation and utilization of the geothermal water are realized.
Drilling a hole from the ground to the heat energy exchange station, arranging a heat energy transmission pipeline 14 and a water return pipeline 15 in the hole, connecting the water return pipeline 15 with a heat exchange side water inlet pipe of heat energy exchange equipment, connecting a heat exchange side water outlet pipe of the heat energy exchange equipment with the heat energy transmission pipeline 15, and transmitting geothermal energy to the ground from the heat energy exchange station 10 through the heat energy transmission pipeline 14 after heat exchange of the heat energy exchange equipment; meanwhile, the coal mining operation of the next working face 17 is continued, and the coal is transported by the transportation tunnel 5 and then lifted to the ground by the main well 2, so that the coal-geothermal water collaborative mining is realized.
The geothermal water extraction system further comprises a geothermal reservoir detection system, and the system comprises a geothermal water level monitoring device, a geothermal water temperature monitoring device, a geothermal water pressure monitoring device and a geothermal reservoir displacement monitoring device.
Claims (2)
1. A coal-geothermal water collaborative mining method based on a collapse column water guide channel comprises the following steps:
step 1, determining a geothermal water gathering area formed by a collapse column water flowing crack contacting a geothermal reservoir according to mine geological data;
step 2, arranging a coal mining system and mining coal:
arranging a main well, an auxiliary well and an air well according to the occurrence characteristics of the coal bed; digging a transportation main roadway, a track main roadway and an air return main roadway in a mining level, arranging a mining area, and arranging a coal face in the mining area; in coal face extraction, reserving section roadways in a gob-side entry retaining mode; transporting the mined coal to the ground through a main transportation roadway and a main well;
step 3, setting a heat energy exchange station:
the heat energy exchange station is established in a roadway reserved along a gob-side entry after the coal face with a certain safety distance from the collapse column is mined, and the heat energy exchange station and the collapse column keep a set safety distance; a heat energy exchange device is arranged in the heat energy exchange station;
step 4, establishing a geothermal water extraction and heat energy transmission system and extracting geothermal water:
the geothermal water extraction and heat energy transmission system comprises: arranging a drilling chamber in a roadway or chamber reserved along a gob-side entry retaining of the previous working face of the current mining working face, and respectively excavating a geothermal well to a geothermal water collection area and a geothermal reservoir by the drilling chamber; arranging a geothermal water extraction pipeline to the geothermal water collection area through a geothermal well, and arranging a tail water reinjection pipeline to a geothermal reservoir; the geothermal water extraction pipeline is away from the tail end of the tail water reinjection pipeline by a set distance; the geothermal water extraction pipeline is connected with a heat supply side intake pipe of heat energy exchange equipment of the heat energy exchange station, and geothermal water in a geothermal reservoir is extracted to the heat energy exchange equipment; the tail water reinjection pipeline is connected with a water outlet pipe on the heat supply side of the heat energy exchange equipment, and the geothermal water is reinjected into the geothermal reservoir after heat exchange; drilling a hole from the ground to the heat energy exchange station, arranging a heat energy transmission pipeline and a water return pipeline in the hole, connecting the water return pipeline with a heat exchange side water inlet pipe of heat energy exchange equipment, connecting a heat exchange side water outlet pipe of the heat energy exchange equipment with the heat energy transmission pipeline, and transmitting geothermal energy to the ground through the heat energy transmission pipeline after heat exchange by the heat energy exchange equipment of the heat energy exchange station; meanwhile, the coal mining operation of the next working face is continued, and the coal is transported through the transportation tunnel and lifted to the ground through the main well, so that the coal-geothermal water collaborative mining is realized.
2. The coal-geothermal water collaborative mining method based on the trapping column water guide channel according to claim 1, wherein the geothermal water extraction and heat energy transmission system further comprises a geothermal reservoir detection system, and the geothermal reservoir detection system comprises a geothermal water level monitoring device, a geothermal water temperature monitoring device, a geothermal water pressure monitoring device and a geothermal reservoir displacement monitoring device, and is used for performing geothermal water level monitoring, geothermal water temperature monitoring, geothermal water pressure monitoring and geothermal reservoir displacement monitoring respectively.
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| CN112761534B (en) * | 2021-02-26 | 2021-11-23 | 中国矿业大学 | Method for arranging oil-gas well drilling platform of large-section chamber under coal mine |
| CN113432322B (en) * | 2021-07-02 | 2022-07-19 | 山东科技大学 | Comprehensive utilization method and test equipment for surface water, goaf and geothermal heat of coal mining subsidence area |
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