CN115596426A - double-L-shaped underground gasification well spacing method for deep coal - Google Patents
double-L-shaped underground gasification well spacing method for deep coal Download PDFInfo
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- CN115596426A CN115596426A CN202211318621.5A CN202211318621A CN115596426A CN 115596426 A CN115596426 A CN 115596426A CN 202211318621 A CN202211318621 A CN 202211318621A CN 115596426 A CN115596426 A CN 115596426A
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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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
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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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
Abstract
The invention discloses a deep coal double-L-shaped underground gasification well spacing method, and belongs to the technical field of coal resource development. The technology is that a well is drilled downwards to a target coal seam at a proper well position, and a first L-shaped well position which is a gas injection well is formed in the target coal seam in a bedding extending mode; and drilling a well downwards to a target coal seam on the other side, and extending a second L-shaped well position along the layer in the target coal seam to form a gas production well which is parallel to the gas injection well. And a high-pressure spray head is arranged in the coal seam running direction of the first L-shaped well position. And the high-pressure spray head is connected with ultrahigh-pressure nitrogen to cut the coal bed to form a crack and is communicated to a second L-shaped well position on the other side. The technology improves the gasification efficiency of deep coal and increases the gas production rate of a single well.
Description
Technical Field
The invention relates to a coal resource development technology, in particular to a deep coal double-L-shaped underground gasification well spacing method.
Background
Underground Coal Gasification (UCG) is a green and environment-friendly coal resource development technology, and the method is to directly convert coal into combustible gas in situ by establishing a gasification reaction furnace in the underground in situ and transport the combustible gas to the surface. The underground gasification avoids the environmental problems of ground dust, gangue stacking and the like, and effectively reduces the pollution and economic loss generated in the coal transportation process. In addition, the technology avoids the geological problems of high ground stress and high ground temperature of deep coal beds, and can promote the development and utilization of deep coal. A great deal of research and attempt are carried out on UCG in all countries of the world, and China also carries out a series of related research and experimental exploration successively. To date, over 1500 million tons of coal have been mined globally using UCG.
The simplest process of underground coal gasification is a U-shaped well structure, wherein one well is used as input, and a gasification agent and a combustion improver are mainly input for ignition; the other well is used as output to output high-calorific-value gas, moisture, ash and other impurities after gasification, and the bottom of the U-shaped well is a gasification furnace which is a main place for coal combustion and incomplete combustion. The well-shaped arrangement of underground coal gasification has great difference according to different coal seam occurrence conditions and geological conditions. With the continuous development of underground coal gasification technology, more gasification processes such as forward combustion penetration, backward combustion penetration, electric penetration, etc. and well arrangement methods such as forward, backward, coaxial backward, fixed gas injection, etc. have been proposed.
The patent is an underground gasification stove CN207144919U, to the gasification passageway of many different horizons of the coal seam of different thickness constitution, many gasification passageways only correspond a gas well of intaking, and the gasification passageway is arranged to the three-dimentional, has improved the gasification exploitation utilization ratio of different thickness coal seam resources greatly.
However, the existing process is mainly designed for a U-shaped well position, the actual occurrence range of underground coal gasification is small, the coal bed gasification rate is slow, the cost recovery period is long, the number of drilling wells needs to be increased in order to increase the gasification rate, and the process cost is further increased.
Disclosure of Invention
In order to solve the problems of low efficiency of a deep coal underground gasification single well, large drilling quantity and high cost in the traditional multi-well mode, the invention provides a deep coal double-L-shaped underground gasification well distribution method, which improves the economic benefit of deep coal underground gasification.
The technical scheme adopted by the invention is a double-L-shaped deep coal underground gasification well spacing method. The specific implementation mode is as follows:
and drilling a well downwards to a target coal seam at a proper well position, and extending a bedding layer in the target coal seam to form a first L-shaped well position which is a gas injection well.
Drilling a well downwards to a target coal seam at the other side, extending a second L-shaped well position along the layer in the target coal seam to form a parallel shape with the gas injection well,
and a high-pressure spray head is arranged in the coal seam walking direction of the first L-shaped well position, a pipeline is arranged in the gas well, and the pipeline is connected with the high-pressure spray head.
The pipeline can be switched to be connected with ultrahigh pressure nitrogen, and the ultrahigh pressure nitrogen is utilized to cut the coal bed to form cracks to communicate with a second L-shaped well position on the other side.
The pipeline can be switched and connected with a gasification agent. The first L-shaped well position is provided with a plurality of ignition devices. And introducing a gasifying agent into the gas injection well, igniting different parts of the coal bed by using an ignition device, and igniting the coal bed to start gasification.
And an air extractor is arranged in the gas production well to form negative pressure. Negative pressure is formed in the gas producing well for pumping, and the produced gas of underground coal gasification is pumped to the surface for subsequent work such as separation and purification.
Advantageous effects
1. The invention utilizes an injection well to cooperate withA plurality of gasification furnaces are controlled by a single output well, the control area of single-well underground coal gasification is increased, and the daily production synthetic gas amount of the existing single gasification furnace is about 19.2 ten thousand Nm 3 The construction of the multi-gasification furnace can improve the yield of the gasification furnace by times, and the yield of the single-well gasification furnace can reach 38.4 ten thousand Nm under the condition of proper construction conditions 3 -96 ten thousand Nm 3 The gasification efficiency of deep coal is improved, and the gas production rate of a single well is increased;
2. the invention uses one injection well and one output well to carry out the gasification engineering construction, reduces the drilling of deep coal underground gasification, reduces the cost of deep coal underground gasification, and improves the gasification area by 300-600% compared with the gasification area of the single well gasifier in the prior art under the condition of proper construction conditions;
3. according to the invention, two horizontal wells are used for controlling multiple gasifiers, and compared with the prior art, the length of the horizontal well is reduced by 20-60% under the condition of proper construction conditions, and the length of a deep coal underground gasification horizontal section and the construction process are reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial enlarged view of the high pressure showerhead;
wherein: 1-gas production well, 2-gas injection well, 3-coal bed, 4-high pressure nozzle, 5-gasification channel, 6-ignition device and 7-gasification cavity.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings. For the purpose of enhancing an understanding of the present invention, the present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1, which is a schematic structural diagram of the whole invention, on the basis of selecting a proper underground coal gasification well position, a well is drilled downwards to a target coal seam to be gasified, a first L-shaped well position which is a gas injection well (2) is formed by extending the bedding in the target coal seam, the well is drilled downwards to the target coal seam on the other side, and a second L-shaped well position (1) is formed by extending the bedding in the target coal seam and is parallel to the gas injection well.
According to the coal seam condition, arrange a plurality of gasification filling opening in the horizontal segment coal seam trend of gas injection well, control near the gas injection opening on the ground, be connected to high-pressure nitrogen gas, utilize high-pressure nitrogen gas to cut and link up, form a plurality of gasification chambeies (7) simultaneously, communicate to producing gas well (1), form gasification passageway (5). Changing internal gas into an oxygen-containing gasifying agent for underground coal gasification, starting combustion near a coal self-ignition device (6), generating combustible gas, entering a horizontal section of a gas production well (1) through a gasification cavity (7), finally converging the combustible gas to a vertical shaft section of the gas production well (1), and finally moving the combustible gas to the ground surface to finish the underground coal gasification of the coal bed in the region.
Fig. 2 is a partial enlarged view near the high-pressure nozzle, as shown in fig. 2, the high-pressure nozzle (4) is connected to the gasification channel (5), an ignition device (6) is installed on one side, the ignition device (6) is a common device in the prior art, the gasification cavity (7) is a coal seam channel fractured by high-pressure nitrogen, and after being switched into a gasification agent, the coal seam is ignited by the ignition device (6) to generate gasification reaction.
The examples are provided for the purpose of illustration only and are not intended to limit the scope of the invention.
Claims (6)
1. A deep coal double L-shaped underground gasification well spacing method is characterized in that a well is drilled to a target coal seam, and a first L-shaped well position which is a gas injection well is formed by extending the inner bedding of the target coal seam; and drilling to a target coal seam on the other side, and extending to form a second L-shaped well position along the layer in the target coal seam to form a gas production well, wherein the gas production well is parallel to the gas injection well.
2. The deep coal double-L-shaped underground gasification well distribution method as claimed in claim 1, wherein the coal seam of the first L-shaped well position is provided with a high-pressure spray head in the upward direction, and the gas well is provided with a pipeline which is connected with the high-pressure spray head.
3. The double-L-shaped underground gasification well distribution method for deep coal according to claim 2, wherein the pipeline can be switched and connected with ultrahigh-pressure nitrogen, and the high-pressure nitrogen is introduced to cut a coal seam to form cracks and is communicated to a second L-shaped well position on the other side.
4. The double-L-shaped underground gasification well spacing method for deep coal as claimed in claim 2, wherein the pipeline can be connected with gasification agent in a switching manner.
5. The deep coal double-L-shaped underground gasification well distribution method according to claim 1, wherein a plurality of ignition devices are arranged at the first L-shaped well position.
6. The double-L-shaped underground gasification well distribution method for deep coal as claimed in claim 1, wherein a gas extraction device is arranged in the gas production well to form negative pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211318621.5A CN115596426A (en) | 2022-10-26 | 2022-10-26 | double-L-shaped underground gasification well spacing method for deep coal |
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| CN202211318621.5A CN115596426A (en) | 2022-10-26 | 2022-10-26 | double-L-shaped underground gasification well spacing method for deep coal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116575900A (en) * | 2023-07-07 | 2023-08-11 | 太原理工大学 | In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method |
| CN117888862A (en) * | 2024-03-18 | 2024-04-16 | 贵州大学 | In-situ large-area drilling and empty-building furnace coal gasification and kerosene and/or coal bed gas simultaneous production method |
| CN117888862B (en) * | 2024-03-18 | 2024-05-17 | 贵州大学 | In-situ large-area drilling and empty-building furnace coal gasification and kerosene and/or coal bed gas simultaneous production method |
-
2022
- 2022-10-26 CN CN202211318621.5A patent/CN115596426A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116575900A (en) * | 2023-07-07 | 2023-08-11 | 太原理工大学 | In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method |
| CN116575900B (en) * | 2023-07-07 | 2023-09-15 | 太原理工大学 | In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method |
| CN117888862A (en) * | 2024-03-18 | 2024-04-16 | 贵州大学 | In-situ large-area drilling and empty-building furnace coal gasification and kerosene and/or coal bed gas simultaneous production method |
| CN117888862B (en) * | 2024-03-18 | 2024-05-17 | 贵州大学 | In-situ large-area drilling and empty-building furnace coal gasification and kerosene and/or coal bed gas simultaneous production method |
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