CN110924919A - Method for increasing production of coal bed gas by waste heat in underground coal gasification process - Google Patents
Method for increasing production of coal bed gas by waste heat in underground coal gasification process Download PDFInfo
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- CN110924919A CN110924919A CN201911263451.3A CN201911263451A CN110924919A CN 110924919 A CN110924919 A CN 110924919A CN 201911263451 A CN201911263451 A CN 201911263451A CN 110924919 A CN110924919 A CN 110924919A
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- 239000003245 coal Substances 0.000 title claims abstract description 219
- 239000007789 gas Substances 0.000 title claims abstract description 156
- 238000002309 gasification Methods 0.000 title claims abstract description 88
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000001965 increasing effect Effects 0.000 title claims abstract description 19
- 239000002918 waste heat Substances 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 19
- 238000003795 desorption Methods 0.000 claims abstract description 6
- 238000000605 extraction Methods 0.000 claims abstract description 5
- 230000005855 radiation Effects 0.000 claims abstract description 5
- 238000005553 drilling Methods 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000010980 drying distillation Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000000197 pyrolysis Methods 0.000 claims description 3
- 238000006722 reduction reaction Methods 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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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
- E21B43/243—Combustion in situ
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for increasing the yield of coal bed gas by waste heat in the underground coal gasification process, which comprises the following steps: s1: pumping a gas injection well and a gas production well into a target coal seam of underground coal gasification from the ground to form a U-shaped well; s2: the horizontal well section of the coal-bed gas well and the gasification channel space of underground coal gasification form X-shaped intersection; s3: an auxiliary device for underground coal gasification is arranged at the tail end of the gas injection well; s4: the high temperature generated by coal combustion heats nearby coal; s5: installing an air extraction device at the ground end of the gas production well; s6: the high-temperature airflow transfers heat to a coal bed produced by the coal bed gas in a radiation and heat conduction mode to heat, so that the desorption rate of the coal bed gas is improved; s7: and discharging coal bed gas from the coal bed gas well. The use method of the invention can reasonably utilize the heat generated in the underground coal gasification process and reduce a large amount of energy consumption in the coal bed gas heat injection development process.
Description
Technical Field
The invention relates to the technical field of coal bed gas heat injection yield increase, in particular to a method for increasing the yield of coal bed gas by waste heat in the underground coal gasification process.
Background
Underground Coal Gasification (UCG) is a special Coal development mode in which Coal is directly pretreated Underground without being mined to the surface. The coal is ignited in the in-situ space of the stratum through a drill hole or a roadway, so that the coal generates a series of thermal and chemical actions, and the solid coal is changed into a gas state and is transported to the ground surface. However, a large amount of energy contained in the high temperature produced gas generated after underground coal gasification is wasted in the gasification channels and the formation. Meanwhile, in order to improve the yield of the coal bed gas, heat is injected into the coal bed, and the desorption and permeability of the coal bed gas are improved, so that an effective method for improving the yield of the coal bed gas is provided. This is a high cost investment. Therefore, the invention provides a method for using heat generated by underground coal gasification to heat a coal bed to promote gas production of coal bed gas.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for increasing the yield of coal bed gas by waste heat in the underground coal gasification process.
The technical scheme adopted by the invention is as follows: a method for increasing the yield of coal bed gas by waste heat in the underground coal gasification process comprises the following steps:
s1, drilling a gas injection well into the gasification target coal seam by using a directional drilling technology to form a gasification channel; simultaneously drilling a well downwards at the other part of the ground, drilling the gas production well into a target coal bed for underground coal gasification through the coal bed gas production coal bed to reach the tail end of the horizontal section of the underground coal gasification production well, and communicating the gas injection well with the gas production well;
s2, drilling from the ground to a target coal seam for coal seam gas development, forming a horizontal well section in the target coal seam for coal seam gas development, and forming an X-shaped intersection with a gasification channel space for underground coal gasification, wherein the horizontal well section is a coal seam gas production well;
s3, at the end of the gas injection well: a series of auxiliary devices for underground coal gasification, such as an ignition device, a gasification agent injection device, a retreating device and the like, are arranged at the gasification combustion cavity;
s4, injecting a gasifying agent into the gasification combustion cavity at the tail end of the gas injection well, igniting to form a high-temperature oxidation zone for underground coal gasification, and starting coal combustion to generate high-temperature gas; the high temperature generated by the combustion of coal heats nearby coal, and promotes the coal to generate reduction reaction, incomplete combustion reaction and drying and dry distillation reaction; the reaction generates a series of high-temperature mixed gases;
s5, installing an air extraction device at the ground end of the gas production well to enable high-temperature gas generated by underground coal gasification to enter a coal bed gas output channel of the underground coal gasification;
s6, transferring high-temperature gas generated by underground coal gasification along a gas output channel of the underground coal gasification, wherein the high-temperature gas passes through a target coal bed produced by coal bed gas, and when the high-temperature gas passes through a low-temperature coal bed, the high-temperature gas transfers heat to the coal bed produced by the coal bed gas in a radiation and heat conduction mode to heat due to the temperature difference, so that the desorption rate of the coal bed gas is increased;
s7: after the coal bed gas production well is drilled into a coal bed, due to the existence of reservoir pressure in the coal bed, once a drill hole reveals the coal bed, the coal bed gas in an adsorption state starts to be desorbed into a free state and is transported to the drill hole with lower pressure, due to the existence of air pressure difference, the coal bed gas is continuously transported to the ground to produce the coal bed gas, and the coal bed gas is discharged from the coal bed gas well.
Further, in the above step S1, the gasification target coal seam thickness is not less than 2m in principle.
Further, in step S1, the casing of the gas well and the casing of the gas production channel are made of materials with good thermal conductivity.
Further, the well wall sleeve is an aluminum-based copper plate.
Further, in the above steps S1 and S2, the distance between the gasification target coal seam and the coal seam gas production target coal seam is greater than 10 m.
Further, in the above steps S1 and S2, the coal seam gas production target coal seam position should be above the target coal seam of the coal underground gasification.
Further, in the above steps S1 and S2, the coalbed methane production wells should be spatially intersected with the horizontal channel of the production well when being arranged in the horizontal interval of the coal seam.
Compared with the prior art, the invention has the beneficial effects that:
1. the heat generated in the underground coal gasification process is reasonably utilized, and a large amount of energy consumption in the coal bed gas heat injection development process is reduced.
2. The horizontal section of the coal bed gas production well and the horizontal section of the UCG gas production well are arranged in a mutually crossed state in space, so that the area of waste heat utilization is increased.
3. By utilizing the waste heat generated by underground coal gasification to increase the production of the coal bed gas, the pollution to the underground water of the stratum when the traditional coal bed gas is developed and utilized for hydraulic fracturing is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a method for increasing the yield of coal bed gas by waste heat in an underground coal gasification process according to the present invention;
FIG. 2 is a schematic view of a well pattern arrangement according to the present invention;
FIG. 3 is a top plan view of a well pattern arrangement according to the present invention;
figure 4 is a side view of a well line arrangement of the present invention.
Wherein: 1-gas injection well, 2-gas production well, 3-production well, 4-coal bed gas production target coal bed, 5-coal underground gasification target coal bed, 6-gasification combustion cavity, 7-stratum, 8-ground, 9-coal bed gas, 10-coal underground gasification agent and 11-coal underground gasification produced gas.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further explained with reference to the accompanying drawings and examples, which are only for the purpose of explaining the present invention and do not limit the scope of the present invention.
A method for increasing the yield of coal bed gas by waste heat in the underground coal gasification process comprises the following steps:
s1, drilling a gas injection well into the gasification target coal seam by using a directional drilling technology to form a gasification channel; simultaneously drilling a well downwards at the other part of the ground, drilling the gas production well into a target coal bed for underground coal gasification through the coal bed gas production coal bed to reach the tail end of the horizontal section of the underground coal gasification production well, and communicating the gas injection well with the gas production well;
s2, drilling from the ground to a target coal seam for coal seam gas development, forming a horizontal well section in the target coal seam for coal seam gas development, and forming an X-shaped intersection with a gasification channel space for underground coal gasification, wherein the horizontal well section is a coal seam gas production well;
s3, at the end of the gas injection well: a series of auxiliary devices for underground coal gasification, such as an ignition device, a gasification agent injection device, a retreating device and the like, are arranged at the gasification combustion cavity;
s4, injecting a gasifying agent into the gasification combustion cavity at the tail end of the gas injection well, igniting to form a high-temperature oxidation zone for underground coal gasification, and starting coal combustion to generate high-temperature gas; the high temperature generated by the combustion of coal heats nearby coal, and promotes the coal to generate reduction reaction, incomplete combustion reaction and drying and dry distillation reaction; the reaction generates a series of high-temperature mixed gases;
s5, installing an air extraction device at the ground end of the gas production well, enabling high-temperature gas generated by underground coal gasification to enter a coal bed gas generation channel of the underground coal gasification, igniting a gas injection well at the tail end of the gas injection well to gasify a coal bed, forming a cavity filled with a large amount of high-temperature and high-pressure combustible gas mixed carbon dioxide, meanwhile, communicating a UCG production well with the gasification cavity, extracting air from the ground upwards by an air extraction facility on the ground, enabling the gas generated by underground coal gasification to enter the UCG gas generation channel and transporting the gas to the ground surface for next treatment;
s6, transferring high-temperature gas generated by underground coal gasification along a gas output channel of the underground coal gasification, wherein the high-temperature gas passes through a target coal bed produced by coal bed gas, and when the high-temperature gas passes through a low-temperature coal bed, the high-temperature gas transfers heat to the coal bed produced by the coal bed gas in a radiation and heat conduction mode to heat due to the temperature difference, so that the desorption rate of the coal bed gas is increased;
s7: after the coal bed gas production well is drilled into a coal bed, due to the existence of reservoir pressure in the coal bed, once a drill hole reveals the coal bed, the coal bed gas in an adsorption state starts to be desorbed into a free state and is transported to the drill hole with lower pressure, due to the existence of air pressure difference, the coal bed gas is continuously transported to the ground to produce the coal bed gas, and the coal bed gas is discharged from the coal bed gas well.
In the above embodiment, according to the method steps shown in fig. 1, well locations are arranged according to the spatial positions shown in fig. 2, 3 and 4, and an underground coal gasification project is first performed, including ignition, formation of gasification combustion cavities and the like, and after the UCG production enters a stable stage, the coal bed gas production well is exposed and gas production is started.
In the above embodiment, the normal temperature coal underground gasification gasifying agent enters the coal seam from the UCG gas injection well, reaches the gasification combustion cavity inside the coal seam, reacts with coal, and forms high temperature gas such as CH4, CO2, H2, etc., the high temperature gas moves upwards along with the UCG gas production well, passes through the horizontal interval of the UCG gas production well (located inside the coal seam gas production target coal seam), the high temperature gas dissipates heat to the coal seam through radiation and heat conduction, increases the temperature of the coal seam gas production target coal seam, promotes desorption of the coal seam gas, moves to the horizontal interval of the coal seam gas production well under the action of pressure difference, and then moves to the earth surface (the gas movement depends on the flow formed by the pressure difference between the ground and the reservoir at the bottom of the earth).
The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.
Claims (7)
1. A method for increasing the yield of coal bed gas by waste heat in the process of underground coal gasification is characterized in that: the method comprises the following steps:
s1, drilling a gas injection well into the gasification target coal seam by using a directional drilling technology to form a gasification channel; simultaneously drilling a well downwards at the other part of the ground, drilling the gas production well into a target coal bed for underground coal gasification through the coal bed gas production coal bed to reach the tail end of the horizontal section of the underground coal gasification production well, and communicating the gas injection well with the gas production well;
s2, drilling from the ground to a target coal seam for coal seam gas development, forming a horizontal well section in the target coal seam for coal seam gas development, and forming an X-shaped intersection with a gasification channel space for underground coal gasification, wherein the horizontal well section is a coal seam gas production well;
s3, installing a series of auxiliary devices for underground coal gasification, such as an ignition device, a gasification agent injection device, a retreating device and the like at the tail end of the gas injection well and at the gasification combustion cavity;
s4, injecting a gasifying agent into the gasification combustion cavity at the tail end of the gas injection well, igniting to form a high-temperature oxidation zone for underground coal gasification, and starting coal combustion to generate high-temperature gas; the high temperature generated by the combustion of coal heats nearby coal, and promotes the coal to generate reduction reaction, incomplete combustion reaction and drying and dry distillation reaction; the reaction generates a series of high-temperature mixed gases;
s5, installing an air extraction device at the ground end of the gas production well to enable high-temperature gas generated by underground coal gasification to enter a coal bed gas output channel of the underground coal gasification;
s6, transferring high-temperature gas generated by underground coal gasification along a gas output channel of the underground coal gasification, wherein the high-temperature gas passes through a target coal bed produced by coal bed gas, and when the high-temperature gas passes through a low-temperature coal bed, the high-temperature gas transfers heat to the coal bed produced by the coal bed gas in a radiation and heat conduction mode to heat due to the temperature difference, so that the desorption rate of the coal bed gas is increased;
s7: after the coal bed gas production well is drilled into a coal bed, due to the existence of reservoir pressure in the coal bed, once a drill hole reveals the coal bed, the coal bed gas in an adsorption state starts to be desorbed into a free state and is transported to the drill hole with lower pressure, due to the existence of air pressure difference, the coal bed gas is continuously transported to the ground to produce the coal bed gas, and the coal bed gas is discharged from the coal bed gas well.
2. The method for increasing the coal bed gas by the waste heat in the coal underground gasification process according to claim 1, which is characterized in that: in the above step S1, the gasification target coal seam thickness is not less than 2m in principle.
3. The method for increasing the coal bed gas by the waste heat in the coal underground gasification process according to claim 1, which is characterized in that: in step S1, the production gas well of underground coal gasification and the well wall casing of the gas production channel are made of materials with good heat conductivity.
4. The method for increasing the coal bed gas by the waste heat in the coal underground gasification process according to claim 3, characterized by comprising the following steps: the well wall sleeve is an aluminum-based copper plate.
5. The method for increasing the coal bed gas by the waste heat in the coal underground gasification process according to claim 1, which is characterized in that: in the above steps S1 and S2, the distance between the gasification target coal seam and the coal bed methane production target coal seam is greater than 10 m.
6. The method for increasing the coal bed gas by the waste heat in the coal underground gasification process according to claim 1, which is characterized in that: in the above steps S1 and S2, the coal seam gas production target coal seam position should be above the target coal seam of coal underground gasification.
7. The method for increasing the coal bed gas by the waste heat in the coal underground gasification process according to claim 1, which is characterized in that: in the above steps S1 and S2, the coalbed methane production wells are arranged in the horizontal interval of the coal seam in a manner of being spatially intersected with the horizontal channel of the production well.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081558A (en) * | 2020-10-10 | 2020-12-15 | 西安科技大学 | Coal underground gasification and coalbed methane collaborative mining method, structure and construction method |
| CN112324393A (en) * | 2020-10-23 | 2021-02-05 | 中联煤层气国家工程研究中心有限责任公司 | Method for exploiting coal bed gas |
| CN112483062A (en) * | 2020-12-17 | 2021-03-12 | 西安科技大学 | Underground interlayer type coal in-situ gasification mining method and system |
| CN112761613A (en) * | 2021-01-20 | 2021-05-07 | 王柱军 | Deep coal in-situ pyrolysis mining and utilizing process |
| CN113803040A (en) * | 2021-10-27 | 2021-12-17 | 西安科技大学 | Oil-rich coal underground in-situ gasification and pyrolysis integrated co-production method |
| CN113914846A (en) * | 2021-10-22 | 2022-01-11 | 西南石油大学 | Method for improving development of underground coal gasification air cavity by applying double-feather horizontal well |
| CN113914847A (en) * | 2021-10-22 | 2022-01-11 | 西南石油大学 | Method for improving development of underground coal gasification air cavity by applying fracturing technology |
| CN113982555A (en) * | 2021-10-26 | 2022-01-28 | 西安交通大学 | Underground in-situ coal pyrolysis system and method |
| CN114856518A (en) * | 2022-05-09 | 2022-08-05 | 大连理工大学 | Method for increasing production of coal bed gas by using medium-low enthalpy dry rock geothermal energy |
| CN114876460A (en) * | 2022-05-12 | 2022-08-09 | 重庆大学 | Method for realizing fluidized mining by in-situ oxidative degradation of deep coal |
| CN115492557A (en) * | 2022-10-18 | 2022-12-20 | 中国矿业大学 | Deep non-recoverable coal seam CO 2 Sealing and coal bed gas negative pressure extraction device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112081558A (en) * | 2020-10-10 | 2020-12-15 | 西安科技大学 | Coal underground gasification and coalbed methane collaborative mining method, structure and construction method |
| CN112324393A (en) * | 2020-10-23 | 2021-02-05 | 中联煤层气国家工程研究中心有限责任公司 | Method for exploiting coal bed gas |
| CN112483062A (en) * | 2020-12-17 | 2021-03-12 | 西安科技大学 | Underground interlayer type coal in-situ gasification mining method and system |
| CN112483062B (en) * | 2020-12-17 | 2022-11-18 | 西安科技大学 | Underground interlayer type coal in-situ gasification mining method and system |
| CN112761613A (en) * | 2021-01-20 | 2021-05-07 | 王柱军 | Deep coal in-situ pyrolysis mining and utilizing process |
| CN113914847A (en) * | 2021-10-22 | 2022-01-11 | 西南石油大学 | Method for improving development of underground coal gasification air cavity by applying fracturing technology |
| CN113914846A (en) * | 2021-10-22 | 2022-01-11 | 西南石油大学 | Method for improving development of underground coal gasification air cavity by applying double-feather horizontal well |
| CN113982555A (en) * | 2021-10-26 | 2022-01-28 | 西安交通大学 | Underground in-situ coal pyrolysis system and method |
| CN113803040A (en) * | 2021-10-27 | 2021-12-17 | 西安科技大学 | Oil-rich coal underground in-situ gasification and pyrolysis integrated co-production method |
| CN114856518A (en) * | 2022-05-09 | 2022-08-05 | 大连理工大学 | Method for increasing production of coal bed gas by using medium-low enthalpy dry rock geothermal energy |
| CN114876460A (en) * | 2022-05-12 | 2022-08-09 | 重庆大学 | Method for realizing fluidized mining by in-situ oxidative degradation of deep coal |
| CN114876460B (en) * | 2022-05-12 | 2023-06-23 | 重庆大学 | Method for realizing fluidization exploitation by in-situ oxidative degradation of deep coal |
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