CN108756846A - The underground coal gasification passage and gasification process being made of Multi-layer U-shape docking well group - Google Patents
The underground coal gasification passage and gasification process being made of Multi-layer U-shape docking well group Download PDFInfo
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- CN108756846A CN108756846A CN201810796917.5A CN201810796917A CN108756846A CN 108756846 A CN108756846 A CN 108756846A CN 201810796917 A CN201810796917 A CN 201810796917A CN 108756846 A CN108756846 A CN 108756846A
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- Prior art keywords
- gasification
- coal seam
- coal
- blast pit
- well
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Classifications
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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
-
- 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
Abstract
The present invention relates to the underground coal gasification passages and gasification process that are made of Multi-layer U-shape docking well group, technical solution is, blast pit is arranged vertically and coal seam is stretched into lower end, it stretches on the blast pit of coal seam part and is provided with multiple reaming sections, injection well includes main borehole, main borehole is arranged vertically and coal seam is stretched into lower end, the each main borehole for stretching into coal seam part is provided with multiple branch well holes stretched out towards blast pit from top to bottom, the end of each branch well hole is connected with the inner cavity of reaming section, the present invention gasifies to different depth coal seam by the multiple branch well holes being arranged in from top to bottom on a main borehole, and underground gasification is implemented separately, save floor area, underground stratified carburation, make full use of the resource of thick sandstone；Using the gasification process gradually to gasify from top to bottom, upper layer carries out lower layer's gasification after gasifying, and is mutually independent of each other, highly practical, and gasification efficiency greatly improved.
Description
Technical field
It is especially a kind of to dock what well group was constituted by Multi-layer U-shape the present invention relates to underground coal gasification(UCG) production technique field
Underground coal gasification passage and gasification process.
Background technology
Coal is exactly directly translated into gaseous fuel (coal gas) by the fundamental starting point of underground coal gasification(UCG) in underground, and
It is applied, this need not dig up coal, completely instead of underground coal mine manual work, to prevent down-hole accident and duty
Industry disease.
Early in 1888, the concept of first, Russia chemist Mendeleev whole world proposition underground coal gasification(UCG) and its set
Think；The Soviet Union in Lenin's epoch in 1932 just establishes First in-situ coal gasification station in the world.During 1976~1979 years, the U.S.
Lao Lunsi .. Lawrence Livermore National Laboratories are researched and developed " controlled injection point backing gasification process " (abbreviation CRIP techniques), this
New process is combined together using the directional drilling and reverse burning of petroleum technology, coal gasification process control instrument on the ground
It is effectively carried out under the controlled condition of facility, retreating the characteristics of gasifying is：By directional horizontal wellss hole injection gasifying agent (water vapour,
Oxygen etc.) and incendiary agent (silane, methane, gasoline) decanting point (i.e. the end of its feed-line) periodically paragraph by paragraph retreat (by
The haulage gear of ground well head executes) and light a fire and blow one section of casing to form new combustion gasification section (band), the success of this technology
Ground solves the constructing of in-situ coal gasification channel, penetrate through and gasification reaction can be expanded continuously and the key problem such as carry out, therefore causes complete
The nearly all country for carrying out in-situ coal gasification of ball imitates and all succeeds mostly.Currently, oil orients horizontal drilling technology
It is docked and connected that ten minute hands are ripe for technology with using with boring instrument and carry out more wells, it has also become the widely used prior art.
Application No. is " underground coal gasification furnace and the gasification process " of " 201510425445.9 ", in same coal seam
It is ranked sequentially multiple directed drillings successively along vertical well homonymy, it is underlying fixed using gradually gasifying from bottom to top when gasification
It to drilling well as gasification tunnel, is preheated using underseam, improves the efficiency of gasification, after the completion of gasification, gasification is completed
The burned out area that gasification tunnel is formed is filled and reinforces, but in practical applications, due to subsurface picture complexity, up to
Hundreds of meters, the highly burned out area up to more than ten meters just can not be filled and reinforce at all, lead to this gasification side from bottom to top
Method can not practical application, improve and innovate it is imperative.
Invention content
For the above situation, to overcome the defect of the prior art, the purpose of the present invention to be just to provide one kind by Multi-layer U-shape pair
The underground coal gasification passage and gasification process for connecing well group composition, can effectively solve underground coal gasification(UCG) and take up a large area, and gasify
The low problem of efficiency.
The technical solution that the present invention solves is：
A kind of underground coal gasification passage being made of Multi-layer U-shape docking well group, which includes row
Gas well and the multiple injection wells being arranged in around blast pit, blast pit is arranged vertically and coal seam is stretched into lower end, stretches into coal seam
Multiple reaming sections are provided on partial blast pit, injection well includes main borehole, and main borehole is arranged vertically and lower end is stretched into
Coal seam, each main borehole for stretching into coal seam part are provided with multiple branch well holes stretched out towards blast pit from top to bottom, often
The end of a branch well hole is connected with the inner cavity of reaming section.
It the quantity of each main borehole top set wellbore and reaming section equal on blast pit and corresponds from top to bottom, structure
At multilayer branch well construction.
A kind of gasification process of underground coal gasification passage, from top to bottom successively sequentially by the Multilateral Wells of each injection well same layer
Eye is used as gasification tunnel, is gradually gasified to the circumocular coal seam of Multilateral Wells, for blast pit as outlet well, coal gas passes through exhaust
Well is suitable for reading to be delivered to ground gaspipe network, specifically includes following steps：
A, it using the branch well hole of top as gasification tunnel, lights a fire to the branch well hole of the gasification tunnel, and
Reverse gasification coal seam, the coal gas for generation of burning are delivered to ground gaspipe network by the way that blast pit is suitable for reading；
When b, declining 10%-20% when the sum of coal gas active principle content continuous 48 is small, which terminates inversely
Gasification coal seam；
C, the second layer branch well hole branch well hole of the gasification tunnel will be carried out a little as gasification tunnel from top to bottom
The coal gas of fire, and coal seam of inversely gasifying, generation of burning is delivered to ground gaspipe network by the way that blast pit is suitable for reading；When coal gas is effective
When the sum of constituent content declines 10%-20% in continuous 48 hours, which terminates coal seam of inversely gasifying；
D, and so on, every layer of branch well hole is used as gasification tunnel to gasify coal seam until the bottom successively respectively from top to bottom
The coal seam gasification of branch well hole finishes, and the coal gas for generation of burning is delivered to ground gaspipe network by the way that blast pit is suitable for reading.
Structure of the invention novel and unique, by being arranged in multiple branch well holes on a main borehole from top to bottom to difference
Depth coal seam is gasified, and underground gasification is implemented separately, and saves floor area, and underground stratified carburation makes full use of huge thick coal
The resource of layer；Using the gasification process gradually to gasify from top to bottom, upper layer carries out lower layer's gasification after gasifying, mutually not shadow
It rings, it is highly practical, and can be carried out at the same time with multiple injection wells, the parallel running simultaneously of multiple gasification furnaces is realized, is greatly improved
Gasification efficiency, easy to use, effect is good, is the innovation on underground coal gasification system, there is good social and economic benefit.
Description of the drawings
Fig. 1 is the cross-sectional view of the present invention.
Fig. 2 is the vertical view of the embodiment of the present invention.
Specific implementation mode
The specific implementation mode of the present invention is described in further detail below in conjunction with attached drawing.
It is provided by Fig. 1-2, the present invention includes blast pit 1 and multiple injection wells for being arranged in around blast pit, and blast pit 1 is in
It arranges vertically and coal seam 2 is stretched into lower end, stretch on the blast pit 1 of coal seam part and be provided with multiple reaming sections 3, injection well includes
Main borehole, main borehole is arranged vertically and coal seam 2 is stretched into lower end, stretches into each main borehole of 2 part of coal seam from top to bottom
Multiple branch well holes stretched out towards blast pit 1 are provided with, the end of each branch well hole is connected with the inner cavity of reaming section；
To ensure using effect, the quantity of each main borehole top set wellbore is with reaming section equal on blast pit and from upper
And lower one-to-one correspondence, multilayer branch well construction is constituted, the branch well hole being connected with each expansion well section is as same layer branch well hole；
The branch well hole is 5-35 ° of (branch in setting, angle of inclination is tilted down towards blast pit side by main borehole side
The angle of borehole axis and horizontal plane).
The level interval of the blast pit 1 and main borehole is 500-1000m；
Inclination section (changeover portion) is provided between the main borehole and branch well hole.
It is both provided with the borehole wall of cementing the well made of steel sleeve and concrete on the main borehole and inner wall, the blast pit 1
Reaming section 3 is open hole well, and rest part is both provided with the borehole wall 4 of cementing the well made of steel sleeve and concrete, and branch well hole is naked
Eye well, the internal diameter of reaming section 3 are 2-2.5 times of internal diameter after the well cementation of blast pit rest part.
Practical subterranean coal distribution situation is more complicated, and spacing distance is also different between layers, the application main borehole
Each coal seam is stretched into vertically with blast pit, reaming section corresponds (one reaming section of every layer of setting) with each coal seam respectively,
According to actual conditions, a branch well hole is arranged in each main borehole in every layer of coal seam, and branch wellbore is integrally set in this layer of coal seam, and
Bottom plate of the branch well hole close to this layer of coal seam is arranged, and end blast pit corresponding with this layer of coal seam expands well section and is connected, so as to
To carry out gasification exploitation to each coal seam in underground.
As shown in Fig. 2, there is 3 injection wells, corresponding main borehole is respectively A, B, C, and 3 main boreholes are arranged in blast pit
Homonymy, the side are the upper side of bearing, and the expansion well section docking corresponding with blast pit of each branch well hole constitutes U-shaped pair
Connect well construction, as shown in Figure 1, stretch on the main borehole A of coal seam part be provided with from top to bottom 4 branch well hole A1, A2, A3,
A4 is stretched on the main borehole B of coal seam part and is provided with 4 branch well holes B1, B2, B3, B4 from top to bottom, branch well hole A1 and point
Branch wellbore B1 is docked with the expansion well section of blast pit first layer, branch well hole A2 and branch well hole B2 with the blast pit second layer
Expand well section docking, branch well hole A3 and branch well hole B3 are docked with the expansion well section of blast pit third layer, branch well hole A4 branches
Wellbore B4 is docked with the expansion well section of the 4th layer of blast pit, constitutes Multi-layer U-shape butt shaft；In practical applications, it can be vented
A gully being mutually parallel with blast pit is arranged in the suitable position of well surrounding, setting and blast pit phase in the bottom of gully
The drainage channel of connection, and the height of drainage channel is less than minimum one layer of branch well hole, to make in each branch well hole
Water can be discharged to gully from drainage channel, ensure each injection well smooth ignition, the water in gully can by pipeline and
Water pump is extracted.
The gasification process of the underground coal gasification passage used for：From top to bottom successively sequentially by point of each injection well same layer
Branch wellbore gradually gasifies to the circumocular coal seam of Multilateral Wells, blast pit passes through as outlet well, coal gas as gasification tunnel
Blast pit is suitable for reading to be delivered to ground gaspipe network, specifically includes following steps：
A, it using the branch well hole of top as gasification tunnel, lights a fire to the branch well hole of the gasification tunnel, and
Reverse gasification coal seam, the coal gas for generation of burning are delivered to ground gaspipe network by the way that blast pit is suitable for reading；
When b, declining 10%-20% when the sum of coal gas active principle content continuous 48 is small, which terminates inversely
Gasification coal seam；
C, the second layer branch well hole branch well hole of the gasification tunnel will be carried out a little as gasification tunnel from top to bottom
The coal gas of fire, and coal seam of inversely gasifying, generation of burning is delivered to ground gaspipe network by the way that blast pit is suitable for reading；When coal gas is effective
When the sum of constituent content declines 10%-20% in continuous 48 hours, which terminates coal seam of inversely gasifying；
D, and so on, every layer of branch well hole is used as gasification tunnel to gasify coal seam until the bottom successively respectively from top to bottom
The coal seam gasification of branch well hole finishes, and the coal gas for generation of burning is delivered to ground gaspipe network by the way that blast pit is suitable for reading.
By taking Fig. 1 as an example, first respectively using branch well hole A1, B1 as gasification tunnel, to the branch well hole of the gasification tunnel
It lights a fire, and respectively reverse gasification coal seam, the coal gas for generation of burning are delivered to ground gaspipe network by the way that blast pit is suitable for reading；
When declining 10%-20% when the sum of coal gas active principle content continuous 48 is small, which terminates coal seam of inversely gasifying；Again
It using branch well hole A1, B1 as gasification tunnel, lights a fire to the branch well hole of the gasification tunnel, and respectively reverse gasification of coal
Layer, the coal gas for generation of burning are delivered to ground gaspipe network by the way that blast pit is suitable for reading；When the sum of coal gas active principle content is continuous
When declining 10%-20% within 48 hours, which terminates coal seam of inversely gasifying；And so on, every layer of Multilateral Wells from top to bottom
Eye gasifies coal seam until the coal seam gasification of the bottom branch well hole A4, B4 finish as gasification tunnel successively respectively, and burning generates
Coal gas be delivered to ground gaspipe network by the way that blast pit is suitable for reading；Casing company can be used with reaming section junction in branch well hole
It is logical, when gasification, it is used as starting point from intersection, does not gasify for 30-35 meters towards the extension of main borehole direction, ensures the stabilization of blast pit.
By the above situation it should be apparent that the present invention has the following advantages：
(1) by being arranged in multiple branch well holes on a main borehole from top to bottom to different depth coal seam into promoting the circulation of qi
Change, and underground gasification is implemented separately, save floor area, underground stratified carburation makes full use of the resource of thick sandstone；
(2) using the gasification process that gradually gasifies from top to bottom, upper layer carries out lower layer's gasification after gasifying, mutually not shadow
It rings, it is highly practical, and can be carried out at the same time with multiple injection wells, the parallel running simultaneously of multiple gasification furnaces is realized, is greatly improved
Gasification efficiency；
(3) borehole wall of cementing the well made of steel sleeve and concrete, the blast pit 1 are both provided on the main borehole and inner wall
Reaming section 3 be open hole well, rest part is both provided with the borehole wall of cementing the well made of steel sleeve and concrete, when gasification, from crossing
Place is used as starting point, and extending 30-35 meters towards main borehole direction does not gasify, and ensure that the stabilization of blast pit, also ensures that gasification and gas
Body produces process continuous-stable and carries out；
(4) since there are multiple injection wells, each branch well hole drilling for noting injection well can alternately with gasification, and drilling machine bores
Well construction and gasification relatively independent operation again, from multiple wells while wellbore construction and underground gasification, this linkage operating type
The whole efficiency of drilling machine and underground gasification will be substantially increased.
Claims (7)
1. a kind of underground coal gasification passage being made of Multi-layer U-shape docking well group, which is characterized in that the underground coal gasification(UCG) is logical
Road includes blast pit (1) and multiple injection wells for being arranged in around blast pit, and blast pit (1) is arranged vertically and lower end is stretched into
Coal seam (2), stretches on the blast pit (1) of coal seam part and is provided with multiple reaming sections (3), and injection well includes main borehole, main borehole
Be arranged vertically and coal seam (2) stretched into lower end, stretch into coal seam (2) part each main borehole be provided with from top to bottom it is multiple
The branch well hole stretched out towards blast pit (1), the end of each branch well hole is connected with the inner cavity of reaming section.
2. the underground coal gasification passage according to claim 1 being made of Multi-layer U-shape docking well group, which is characterized in that
It the quantity of each main borehole top set wellbore and reaming section equal on blast pit and corresponds from top to bottom, constitutes multilayer point
Branch well construction.
3. the underground coal gasification passage according to claim 1 being made of Multi-layer U-shape docking well group, which is characterized in that
The branch well hole is 5-35 ° in setting, angle of inclination is tilted down towards blast pit side by main borehole side.
4. the underground coal gasification passage according to claim 1 being made of Multi-layer U-shape docking well group, which is characterized in that
The level interval of the blast pit (1) and main borehole is 500-1000m.
5. the underground coal gasification passage according to claim 1 being made of Multi-layer U-shape docking well group, which is characterized in that
It is provided with inclination section between the main borehole and branch well hole.
6. the underground coal gasification passage according to claim 1 being made of Multi-layer U-shape docking well group, which is characterized in that
It is both provided with the borehole wall of cementing the well made of steel sleeve and concrete, the reaming section of the blast pit (1) on the main borehole and inner wall
(3) it is open hole well, rest part is both provided with the borehole wall of cementing the well made of steel sleeve and concrete.
7. a kind of gasification process using the underground coal gasification passage described in claim 1-6 any one, which is characterized in that
Sequence carries out the circumocular coal seam of Multilateral Wells using the branch well hole of each injection well same layer as gasification tunnel successively from top to bottom
Gradually gasify, blast pit is delivered to ground gaspipe network by the way that blast pit is suitable for reading, specifically includes following step as outlet well, coal gas
Suddenly：
A, it using the branch well hole of top as gasification tunnel, lights a fire to the branch well hole of the gasification tunnel, and reverse
Gasification coal seam, the coal gas for generation of burning are delivered to ground gaspipe network by the way that blast pit is suitable for reading；
When b, declining 10%-20% when the sum of coal gas active principle content continuous 48 is small, which terminates inversely to gasify
Coal seam；
C, it second layer branch well hole will light a fire from top to bottom to the branch well hole of the gasification tunnel as gasification tunnel, and
And coal seam of inversely gasifying, the coal gas for generation of burning are delivered to ground gaspipe network by the way that blast pit is suitable for reading；When coal gas active principle
When the sum of content declines 10%-20% in continuous 48 hours, which terminates coal seam of inversely gasifying；
D, and so on, every layer of branch well hole is used as gasification tunnel to gasify coal seam until bottom branch successively respectively from top to bottom
The coal seam gasification of wellbore finishes, and the coal gas for generation of burning is delivered to ground gaspipe network by the way that blast pit is suitable for reading.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810796917.5A CN108756846A (en) | 2018-07-19 | 2018-07-19 | The underground coal gasification passage and gasification process being made of Multi-layer U-shape docking well group |
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| CN201810796917.5A CN108756846A (en) | 2018-07-19 | 2018-07-19 | The underground coal gasification passage and gasification process being made of Multi-layer U-shape docking well group |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112160738A (en) * | 2020-09-18 | 2021-01-01 | 西安交通大学 | Well arrangement structure for underground in-situ pyrolysis of coal and construction method thereof |
| CN112922578A (en) * | 2021-02-06 | 2021-06-08 | 中国地质科学院勘探技术研究所 | Multi-well convergence communication water-resisting and heat-extracting geothermal exploitation construction method |
| CN114016990A (en) * | 2021-11-04 | 2022-02-08 | 西安交通大学 | Direct oil extraction and waste heat utilization system of underground electrical heating of rich oil coal |
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Application publication date: 20181106 |