CN116411887B - Device and method for exploiting coal bed gas by utilizing geothermal energy - Google Patents
Device and method for exploiting coal bed gas by utilizing geothermal energy Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 199
- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 171
- 238000002347 injection Methods 0.000 claims abstract description 90
- 239000007924 injection Substances 0.000 claims abstract description 90
- 238000003809 water extraction Methods 0.000 claims abstract description 70
- 239000011435 rock Substances 0.000 claims abstract description 22
- 238000010521 absorption reaction Methods 0.000 claims abstract description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 68
- 238000005553 drilling Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000005065 mining Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000000605 extraction Methods 0.000 abstract description 16
- 238000010494 dissociation reaction Methods 0.000 abstract description 2
- 230000005593 dissociations Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 64
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000009933 burial Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000003795 desorption Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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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- 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
- E21B43/006—Production of coal-bed methane
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a device and a method for exploiting coal bed gas by utilizing geothermal energy, belonging to the technical field of coal bed gas exploitation; the method comprises the steps that a coal bed cold water extraction well and a coal bed hot water injection well are communicated through an exothermic crack channel formed in a coal bed gas extraction area, so that a coal bed water channel is formed; communicating the geothermal cold water injection well with the geothermal hot water extraction well through a heat absorption crack channel formed in the geothermal rock stratum to form a geothermal water channel; the geothermal water channel is connected with the coal bed water channel and is used for transferring heat of the geothermal water channel to the coal bed water channel to perform coal bed gas exploitation; the invention heats the coal bed gas, not only utilizes hot water formed after heat exchange as a heat source, but also uses hot gas transferred from the crack surface as a heat source to heat the coal bed gas, improves the dissociation of the coal bed gas and the coal bed, and effectively improves the extraction efficiency and the extraction quantity of the coal bed gas.
Description
Technical Field
The invention belongs to the technical field of coalbed methane exploitation, and relates to a device and a method for exploiting coalbed methane by using geothermal energy.
Background
The coal bed gas is used as a clean energy source, can replace natural gas, has very rich reserves and has wide development prospect. Meanwhile, the development and utilization of the coal bed gas can reduce environmental pollution, improve the safety of coal mine production and effectively reduce coal mine gas disasters. Coal reservoirs in China generally have the characteristics of poor permeability and strong coalbed methane adsorption, are main reasons for difficult coalbed methane migration and low gas well yield, and are difficult to fundamentally improve gas yield without adopting corresponding coalbed methane yield increasing technology. The heat injection exploitation coal bed gas technology is an effective technology for enhancing coal bed gas extraction by injecting hot water or steam into a gas-containing coal bed to provide heat for the coal bed, so that a large amount of adsorbed coal bed gas can be promoted to be quickly desorbed, and the gas extraction driving pressure is improved.
The heat injection coal bed gas exploitation technology mainly injects high-temperature hot water or steam generated in a boiler into a coal bed through a ground pipe network, so that the desorption efficiency of the coal bed gas is improved. At present, boiler systems used in the technology of coal bed gas injection exploitation are of two types, namely electric heating and coal burning, according to different heating modes. The electric heating type boiler uses high-grade electric energy as energy for generating injection hot water or steam, and is continuously heated for a long time, so that the electric consumption cost is high, and the economic feasibility is poor. The coal-fired boiler uses raw coal energy, and has lower daily running cost. Therefore, there is a need to seek green, low-carbon, and practical energy sources to drive the development of coalbed methane thermal recovery technologies.
Geothermal energy is a novel, resource-rich renewable energy source that derives from the decay of molten magma and radioactive materials within the earth. It can be said that geothermal energy is a ubiquitous energy source, and any position of the earth surface can be detected downwards to find different types of geothermal energy at different depths, and the deeper the stratum is, the higher the geothermal temperature and the energy are, and the geothermal energy is divided into high-enthalpy, medium-enthalpy and low-enthalpy geothermal heat. The approximate average geothermal gradient of the crust is 25 ℃/km, and the geothermal gradient values are different at different points, typically (1.0-3.0) c/km. Calculated as such, under typical conditions, the surface temperature is 25 ℃, and the temperature of the 4000m buried formation has exceeded 100 ℃. The influence of different temperatures on the desorption amount of the coal bed gas is very remarkable, and many scholars research and think that the desorption amount of the coal bed gas can be improved by more than 50% compared with the normal temperature condition when the coal body is heated to 60 ℃ from normal temperature. The exploitation burial depth of the common coal bed gas reservoir is 600-1200 m, and under the normal ground temperature condition, the underground ground rock stratum with the temperature exceeding 100 ℃ can be found at the position of about 3000m below the coal bed gas reservoir. Therefore, the method utilizes geothermal resources at the lower part of the coal reservoir to carry out coal bed methane reinforcement extraction nearby, is a reasonable and applicable innovative industrialization scheme, and has universality for the development of gas-containing coal beds in different areas.
The traditional Chinese patent CN 114856518A in the field is a method for heating coal bed gas in a well by using high-temperature fluid obtained by geothermal energy, and further injecting high Wen Meiceng gas into the coal bed, thereby improving the extraction efficiency of the coal bed gas.
The method uses coal bed gas as a heat exchange medium for heating the coal bed, and has the following defects: 1) The heat exchange of the coalbed methane is implemented in the well, the heat exchange space is limited, the heat exchange efficiency is poor, and the temperature of the coalbed methane is slowly raised. 2) The heat exchange coefficient and specific heat capacity of the gas are very low, the gas is heated from 20 ℃ to 100 ℃ under the atmospheric pressure, the heat carried by the same volume of water is 3250 times of that of the same volume of air, and the gas carrying capacity is very poor. It can be seen that the coal bed gas used as a heat exchange medium cannot carry a large amount of heat into the coal bed, and the yield of the coal bed gas is difficult to improve.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a device and a method for exploiting coal bed gas by using geothermal energy so as to improve the heat exchange efficiency and the yield of the coal bed gas.
In order to achieve the above purpose, the present invention is realized by the following technical scheme.
The device for exploiting the coal bed gas by utilizing the geothermal energy is characterized in that a coal bed cold water extraction well, a coal bed hot water injection well and a coal bed gas exploitation well are arranged from the ground to a coal bed gas exploitation area, and the coal bed gas exploitation area forms an exothermic crack channel through fracturing; the coal seam cold water extraction well and the coal seam hot water injection well are communicated through the heat release crack channel to form a coal seam water channel.
The geothermal stratum from the ground to the lower part of the coal bed gas exploitation area is provided with a geothermal cold water injection well and a geothermal hot water extraction well, and the geothermal stratum forms a heat absorption crack channel through fracturing; the geothermal cold water injection well and the geothermal hot water extraction well are communicated through the heat absorption crack channel to form a geothermal water channel.
The geothermal water channel is connected with the coal seam water channel and is used for transferring heat of the geothermal water channel to the coal seam water channel.
Preferably, the geothermal water channel is connected with the coal seam water channel, namely a water outlet of the geothermal hot water extraction well is connected with the geothermal cold water injection well through a ground heat exchange station, and a water outlet of the coal seam cold water extraction well is connected with the coal seam hot water injection well through the ground heat exchange station.
Preferably, the geothermal water channel is connected with the coal seam water channel, namely, the water outlet of the geothermal hot water extraction well is connected with the water inlet of the coal seam hot water injection well, and the water outlet of the coal seam cold water extraction well is connected with the water inlet of the geothermal cold water injection well.
Preferably, the water outlet end of the coal seam cold water extraction well and the water outlet end of the geothermal hot water extraction well are connected with slag removal devices.
Preferably, the front end of the water inlet of the coal bed hot water injection well is connected with the secondary heating station.
A method for mining coalbed methane using geothermal heat, comprising the steps of:
1) Drilling a coal bed cold water extraction well and a coal bed hot water injection well into a coal bed gas exploitation area respectively, and forming an exothermic crack channel in a fracturing mode; the coal seam cold water extraction well and the coal seam hot water injection well are communicated through the heat release crack channel to form a coal seam water channel.
2) Drilling a geothermal cold water injection well and a geothermal hot water extraction well into a geothermal stratum at the lower part of the coalbed methane exploitation area respectively, and forming a heat absorption crack channel in a fracturing mode; the geothermal cold water injection well and the geothermal hot water extraction well are communicated through the heat absorption crack channel to form a geothermal water channel.
3) Connecting the geothermal water channel with the coal seam water channel for transferring heat of the geothermal water channel to the coal seam water channel; and drilling a coal bed gas exploitation well into the coal bed gas exploitation region, transferring heat to the coal bed water channel through the geothermal water channel to heat the coal bed gas exploitation region, and exploiting the coal bed gas through the coal bed gas exploitation well.
Preferably, the geothermal water channel is connected with the coal seam water channel, namely, the water outlet of the geothermal hot water extraction well is connected with the water inlet of the coal seam hot water injection well, and the water outlet of the coal seam cold water extraction well is connected with the water inlet of the geothermal cold water injection well; heat is directly transferred to the coal seam water tunnel through the geothermal water tunnel.
Preferably, the geothermal water channel is connected with the coal seam water channel, namely a water outlet of the geothermal hot water extraction well is connected with the geothermal cold water injection well through a ground heat exchange station, and a water outlet of the coal seam cold water extraction well is connected with the coal seam hot water injection well through the ground heat exchange station; heat is indirectly transferred to the coal seam water tunnel through the geothermal water tunnel.
Preferably, the distance between the geothermal rock stratum and the coal bed gas exploitation area is more than 1500m, and the temperature of the geothermal rock stratum is more than or equal to 80 ℃; the temperature of hot water injected into the exothermic crack channel along the coal seam hot water injection well is more than or equal to 100 ℃.
Preferably, the exothermic fracture channel is located at or within 1.0m of the interface of the coal seam with its floor.
Preferably, the exothermic fracture channel and the endothermic fracture channel can be communicated by hydraulic fracturing or directional drilling.
Compared with the prior art, the invention has the following beneficial effects:
1. the geothermal stratum formed by the conventional geothermal gradient at the lower part of the coal bed is used as the circulating water heat exchange layer, geothermal resources are clear and are easy to obtain, and the scheme has universality.
2. The hydraulic fracturing is carried out in the lower region of the coal seam to form a heat exchange crack channel, which is equivalent to the effect that a heat blanket is paved at the lower part of the coal seam, heat and gas are transferred upwards perpendicular to the crack, water mainly flows horizontally along the crack surface with low migration resistance, and the phenomenon of water lock is not easy to migrate to the upper part of the coal body.
3. The hot water formed after heat exchange is used as a heat source for heating the coal bed gas, and the hot gas transferred from the crack surface is also used as a heat source for heating the coal bed gas, so that the dissociation of the coal bed gas and the coal bed is improved, and the extraction efficiency and the extraction quantity of the coal bed gas are effectively improved.
Drawings
Fig. 1 is an overall schematic diagram of an apparatus for mining coalbed methane using geothermal heat when the quality of geothermal hot water is poor in examples 1 and 2.
FIG. 2 is an overall schematic diagram of an apparatus for exploiting coalbed methane by using geothermal water in example 3 when the quality of geothermal hot water is good.
In the figure, 1-exothermic crack channel; 2-a coal seam cold water extraction well; 3-a coal seam hot water injection well; 4-endothermic crack channel; 5-geothermal cold water injection well; 6-geothermal hot water extraction well; 7-a heat exchange station; 8-a secondary heating station; 9-deslagging device; 10-coal bed gas exploitation well; 11-coal bed gas mining area; 12-geothermal rock formation; solid arrows indicate the direction of water flow; the dashed arrows indicate the flow direction of the coal bed gas.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail by combining the embodiments and the drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The following describes the technical scheme of the present invention in detail with reference to examples and drawings, but the scope of protection is not limited thereto.
Example 1
The geothermal rock stratum has a buried depth of 3000m and a thickness of 100m, and the heat storage temperature is lower (85 ℃); the burial depth of the coal bed gas reservoir is 1000m, the thickness of the coal bed is 10m, and the geothermal hot water quality is poor. An apparatus and a method for exploiting coal bed gas by using geothermal energy are shown in fig. 1, and the specific steps are as follows:
1. drilling and fracturing engineering is performed in the coalbed methane reservoir and geothermal rock formation, respectively. First, a well is drilled into a region near the lower part of a coal bed, namely a coalbed methane mining region 11, and a drilling depth is 1010m, so that a coalbed cold water extraction well 2 and a coalbed hot water injection well 3 are formed. And carrying out fracturing engineering on the interface of the coal bed at the bottom of the well drilling and the bottom plate to form an exothermic crack channel 1, wherein the exothermic crack channel 1 is positioned at the interface of the coal bed and the bottom plate. The exothermic crack channel 1 is communicated with the coal seam cold water extraction well 2 and the coal seam hot water injection well 3. Then, the well is drilled into the geothermal rock stratum 12 at the lower part of the coalbed methane exploitation area 11, the drilling depth is 3050m, and the geothermal cold water injection well 5 and the geothermal hot water extraction well 6 are formed. And carrying out fracturing engineering at the bottom of the geothermal well to form a heat absorption crack channel 4 and communicating a geothermal cold water injection well 5 with a geothermal hot water extraction well 6. Both the exothermic fracture channel 1 and the endothermic fracture channel 4 can be in communication by hydraulic fracturing or directional drilling.
2. The coal seam cold water extraction well 2 and the coal seam hot water injection well 3 are communicated with the ground heat exchange station 7 to form a first loop; the geothermal cold water injection well 5 and the geothermal hot water extraction well 6 are communicated with the ground heat exchange station 7 to form a second loop, and the first loop and the second loop respectively form heat exchange water circulation systems of two independent channels.
3. In the operation process, cold water is injected into the heat absorption crack channel 4 in the geothermal stratum 12 along the geothermal cold water injection well 5, 80 ℃ hot water is formed after the cold water exchanges heat with surrounding rock, then the hot water is discharged from the geothermal hot water extraction well 6, large particle suspended matters in the water body are removed through the deslagging device 9 arranged on the ground and enter the ground heat exchange station 7, and after the temperature is reduced, the geothermal cold water is injected into the geothermal stratum 12 along the geothermal cold water injection well 5, so that a geothermal water circulation system is formed.
4. The 80 ℃ hot water exchanges heat with cold water in another channel in the ground heat exchange station 7 to generate 75 ℃ hot water, and the 75 ℃ hot water is secondarily heated by the secondary heating station 8 to form 100 ℃ hot water, wherein the secondary heating station 8 adopts an electric heating mode. Hot water at 100 ℃ is injected into the exothermic crack channel 1 along the coal bed hot water injection well 3, and the coal body is gradually heated upwards from the interface of the coal bed and the bottom plate, so that a large amount of adsorbed coal bed gas is desorbed and then is produced along the coal bed gas exploitation well 10. The cold water after heat release enters the ground deslagging device 9 through the coal seam cold water extraction well 2 to remove large particle suspended matters in the water body, and then enters the ground heat exchange station 7 to perform circulating heat exchange and temperature rise, so that a coal seam water circulating system is formed.
According to the water temperature change and the coalbed methane output efficiency, performing different time interval function rotation on the coalbed cold water extraction well 2 and the coalbed hot water injection well 3, namely changing the extraction well into the injection well; the injection well becomes a production well. According to the water temperature change, performing different time interval function rotations on the geothermal cold water injection well 5 and the geothermal hot water extraction well 6, namely, changing the extraction well into an injection well; the injection well becomes a production well.
Example 2
The burial depth of the geothermal rock stratum is 4000m, the thickness is 100m, and the heat storage temperature is higher (110 ℃); the burial depth of the coal bed gas reservoir is 1000m, the thickness of the coal bed is 12m, and the geothermal hot water quality is poor. An apparatus and a method for exploiting coal bed gas by using geothermal energy are shown in fig. 1, and the specific steps are as follows:
1. drilling and fracturing engineering is performed in the coalbed methane reservoir and geothermal rock formation, respectively. First, a well is drilled into the lower region of the coal bed, namely the coal bed gas mining region 11, and the drilling depth is 1011.5m, so that a coal bed cold water extraction well 2 and a coal bed hot water injection well 3 are formed. And carrying out fracturing engineering on the position of 0.5m on the interface between the coal bed at the bottom of the well drilling and the bottom plate to form an exothermic crack channel 1 and communicate the coal bed cold water extraction well 2 and the coal bed hot water injection well 3. Then, a well is drilled into the geothermal rock layer 12 at the lower part of the coalbed methane exploitation region 11, and the drilling depth is 4050m, so that a geothermal cold water injection well 5 and a geothermal hot water extraction well 6 are formed. And carrying out fracturing engineering at the bottom of the geothermal well to form a heat absorption crack channel 4 and communicating a geothermal cold water injection well 5 with a geothermal hot water extraction well 6.
2. The coal seam cold water extraction well 2 and the coal seam hot water injection well 3 are communicated with the ground heat exchange station 7; the geothermal cold water injection well 5 and the geothermal hot water extraction well 6 are communicated with the ground heat exchange station 7 to form heat exchange water circulation systems of two independent channels respectively.
3. In the operation process, cold water is injected into a heat absorption crack channel 4 in a geothermal stratum 12 along a geothermal cold water injection well 5, 105 ℃ hot water formed after heat exchange with surrounding rock is discharged from a geothermal hot water extraction well 6, large particle suspended matters in water body are removed through a deslagging device 9 on the ground and then enter a ground heat exchange station 7, and after the temperature is reduced, the ground hot water is injected into the geothermal stratum 12 along the geothermal cold water injection well 5, so that a geothermal water circulation system is formed.
4. The hot water at 105 ℃ exchanges heat with cold water in another channel in the ground heat exchange station 7 to generate hot water at 100 ℃, and the hot water at 100 ℃ is injected into the heat release crack channel 1 along the coal bed hot water injection well 3 and gradually heats the coal body upwards, so that a large amount of adsorbed coal bed gas is desorbed and then is produced along the coal bed gas exploitation well 10. The cold water after heat release enters a deslagging device 9 on the ground through a coal seam cold water extraction well 2 to remove large particle suspended matters in water body, and then enters a ground heat exchange station 7 to perform circulating heat exchange and temperature rise, so that a coal seam water circulating system is formed.
According to the water temperature change and the coalbed methane output efficiency, performing different time interval function rotation on the coalbed cold water extraction well 2 and the coalbed hot water injection well 3, namely changing the extraction well into the injection well; the injection well becomes a production well. According to the water temperature change, performing different time interval function rotations on the geothermal cold water injection well 5 and the geothermal hot water extraction well 6, namely, changing the extraction well into an injection well; the injection well becomes a production well.
Example 3
The geothermal rock stratum has a buried depth of 3000m and a thickness of 100m, and the heat storage temperature is lower (85 ℃); the burial depth of the coal bed gas reservoir is 1000m, the thickness of the coal bed is 10m, and the geothermal hot water quality is good. An apparatus and method for mining coalbed methane using geothermal energy, refer to fig. 2, and specifically includes the following steps:
1. drilling and fracturing engineering is performed in the coalbed methane reservoir and geothermal rock formation, respectively. First, a well is drilled into the lower region of the coal bed, namely, the coal bed gas exploitation region 11, and the drilling depth is 1010m, so that a coal bed cold water extraction well 2 and a coal bed hot water injection well 3 are formed. And carrying out fracturing engineering on the interface of the coal bed at the bottom of the well drilling and the bottom plate to form an exothermic crack channel 1 and communicate the coal bed cold water extraction well 2 and the coal bed hot water injection well 3. Then, the well is drilled into the geothermal rock stratum 12 at the lower part of the coalbed methane exploitation area 11, the drilling depth is 3050m, and the geothermal cold water injection well 5 and the geothermal hot water extraction well 6 are formed. And carrying out fracturing engineering at the bottom of the geothermal well to form a heat absorption crack channel 4 and communicating a geothermal cold water injection well 5 with a geothermal hot water extraction well 6.
2. The coal seam cold water extraction well 2 is directly communicated with the geothermal cold water injection well 5, and the coal seam hot water injection well 3 is directly communicated with the geothermal hot water extraction well 6.
3. In the operation process, cold water is injected into the heat absorption crack channel 4 in the geothermal stratum 12 along the geothermal cold water injection well 5, hot water at 80 ℃ is formed after heat exchange with surrounding rock and is discharged from the geothermal hot water extraction well 6, after large-particle suspended matters in water are removed through the deslagging device 9 on the ground, the hot water enters into a secondary heating station 8 at the front end of the coal bed hot water injection well 3 to be secondarily heated to 100 ℃, then the heat absorption crack channel 1 is injected into the coal bed hot water injection well 3, the coal body is gradually heated upwards from the interface of the coal bed and the bottom plate, and a large amount of adsorbed coal bed gas is promoted to be desorbed and then is produced along the coal bed gas extraction well 10.
4. The cold water after heat release enters a deslagging device 9 on the ground through a coal bed cold water extraction well 2 to remove large-particle suspended matters in the water body, and then is injected into a geothermal rock stratum 12 along a geothermal cold water injection well 5 to form a water circulation heat exchange system.
According to the water temperature change and the coalbed methane output efficiency, performing different time interval function rotation on the coalbed cold water extraction well 2 and the coalbed hot water injection well 3, namely changing the extraction well into the injection well; the injection well becomes a production well. According to the water temperature change, performing different time interval function rotations on the geothermal cold water injection well 5 and the geothermal hot water extraction well 6, namely, changing the extraction well into an injection well; the injection well becomes a production well.
While the invention has been described in detail in connection with specific preferred embodiments thereof, it is not to be construed as limited thereto, but rather as a result of a simple deduction or substitution by a person having ordinary skill in the art to which the invention pertains without departing from the scope of the invention defined by the appended claims.
Claims (6)
1. The device for exploiting the coalbed methane by utilizing the geothermal heat is characterized in that a coalbed cold water extraction well (2), a coalbed hot water injection well (3) and a coalbed methane exploitation well (10) are arranged from the ground to a coalbed methane exploitation region (11), and the coalbed methane exploitation region (11) forms an exothermic crack channel (1) through fracturing; the coal seam cold water extraction well (2) and the coal seam hot water injection well (3) are communicated through the exothermic crack channel (1) to form a coal seam water channel;
the geothermal rock stratum (12) from the ground to the lower part of the coalbed methane exploitation area (11) is provided with a geothermal cold water injection well (5) and a geothermal hot water extraction well (6), and the geothermal rock stratum (12) forms a heat absorption crack channel (4) through fracturing; the geothermal cold water injection well (5) and the geothermal hot water extraction well (6) are communicated through the heat absorption crack channel (4) to form a geothermal water channel;
the geothermal water channel is connected with the coal seam water channel and is used for transferring heat of the geothermal water channel to the coal seam water channel; the geothermal water channel is connected with the coal seam water channel, namely, the water outlet of the geothermal hot water extraction well (6) is connected with the geothermal cold water injection well (5) through the ground heat exchange station (7), and the water outlet of the coal seam cold water extraction well (2) is connected with the coal seam hot water injection well (3) through the ground heat exchange station (7); or the water outlet of the geothermal hot water extraction well (6) is connected with the water inlet of the coal seam hot water injection well (3), and the water outlet of the coal seam cold water extraction well (2) is connected with the water inlet of the geothermal cold water injection well (5).
2. The device for exploiting coal bed gas by utilizing geothermal energy according to claim 1, wherein a deslagging device (9) is connected to the water outlet end of the coal bed cold water extraction well (2) and the water outlet end of the geothermal hot water extraction well (6).
3. A device for exploiting coalbed methane by utilizing geothermal energy according to claim 1, characterized in that the front end of the water inlet of the coalbed hot water injection well (3) is connected with the secondary heating station (8).
4. A method for mining coalbed methane by utilizing geothermal energy, which is characterized by comprising the following steps:
1) respectively drilling a coal bed cold water extraction well (2) and a coal bed hot water injection well (3) into a coal bed gas exploitation region (11), and forming an exothermic crack channel (1) in the coal bed gas exploitation region (11) in a fracturing mode; the coal seam cold water extraction well (2) and the coal seam hot water injection well (3) are communicated through the exothermic crack channel (1) to form a coal seam water channel;
2) Drilling a geothermal cold water injection well (5) and a geothermal hot water extraction well (6) into a geothermal stratum (12) at the lower part of a coalbed methane exploitation region (11) respectively, and forming a heat absorption crack channel (4) in the geothermal stratum (12) in a fracturing mode; the geothermal cold water injection well (5) and the geothermal hot water extraction well (6) are communicated through the heat absorption crack channel (4) to form a geothermal water channel;
3) Connecting the geothermal water channel with the coal seam water channel for transferring heat of the geothermal water channel to the coal seam water channel; drilling a coal bed gas exploitation well (10) into a coal bed gas exploitation area (11), transferring heat to the coal bed water channel through a geothermal water channel to heat the coal bed gas exploitation area, and exploiting the coal bed gas through the coal bed gas exploitation well (10);
the geothermal water channel is connected with the coal seam water channel, namely, the water outlet of the geothermal hot water extraction well (6) is connected with the water inlet of the coal seam hot water injection well (3), and the water outlet of the coal seam cold water extraction well (2) is connected with the water inlet of the geothermal cold water injection well (5); directly transferring heat to the coal seam water channel through the geothermal water channel; or the water outlet of the geothermal hot water extraction well (6) is connected with the geothermal cold water injection well (5) through the ground heat exchange station (7), and the water outlet of the coal seam cold water extraction well (2) is connected with the coal seam hot water injection well (3) through the ground heat exchange station (7); heat is indirectly transferred to the coal seam water tunnel through the geothermal water tunnel.
5. A method of exploiting coal seam gas from geothermal heat according to claim 4, characterized in that the distance of the geothermal rock formation (12) from the coal seam gas exploitation region (11) is > 1500m and the temperature of the geothermal rock formation (12) is not less than 80 ℃; the temperature of hot water injected into the exothermic crack channel (1) along the coal seam hot water injection well (3) is more than or equal to 100 ℃.
6. A method of mining coalbed methane using geothermal energy according to claim 4, characterised in that the exothermic fracture path (1) is located at or within 1.0m above the interface of the coalbed and its floor.
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