WO1999063200A1 - A coal mine through which coal gas can be produced directly from coal seam and a coal gas production method through the mine - Google Patents

A coal mine through which coal gas can be produced directly from coal seam and a coal gas production method through the mine Download PDF

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Publication number
WO1999063200A1
WO1999063200A1 PCT/CN1999/000072 CN9900072W WO9963200A1 WO 1999063200 A1 WO1999063200 A1 WO 1999063200A1 CN 9900072 W CN9900072 W CN 9900072W WO 9963200 A1 WO9963200 A1 WO 9963200A1
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Prior art keywords
gas
coal
gasification
mine
gas injection
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PCT/CN1999/000072
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French (fr)
Chinese (zh)
Inventor
Zhaoxi Chai
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Zhaoxi Chai
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Priority to AU40289/99A priority Critical patent/AU4028999A/en
Publication of WO1999063200A1 publication Critical patent/WO1999063200A1/en

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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
    • E21B43/16—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

Definitions

  • the invention relates to a method for developing coal resources, that is, a mine and a production method for directly producing coal gas in a coal seam, and belongs to mining technology.
  • An object of the present invention is to provide a mine and a production method for directly producing coal gas in a coal seam. Personnel operate gasification production nearby in the mine, and monitor and control the gasification process nearby, thereby solving the problems existing in "underground coal gasification”. Technical, economic, and environmental problems, and the problems of coal mines.
  • the main contents of the gasification mine of the present invention are:
  • the mine includes a mine ventilation system consisting of a ventilation shaft and a ventilation roadway.
  • the ventilation system drains, transports and lifts at the same time, providing conditions for personnel to work underground.
  • Mine includes underground gas transportation and gas transportation system to the ground composed of gas passages (the term “channel” includes pipelines, shafts, roadways, boreholes or other forms of holes, the same applies hereinafter), and by gas injection Gas injection system consisting of boreholes and gasification channels;
  • the mine uses the gasification channel in the coal seam to form an "underground gasifier", which produces gas directly.
  • One end of the mine is connected to a gas injection borehole. Gas is injected. The produced gas is discharged into the gas channel from the other end and transported to the surface. ;
  • the method for producing gas in the "gasification mine” of the present invention is as follows: there is a gasification channel (that is, an "underground gasification furnace") in the coal seam, one end of which is connected to the gas channel, and the other end is drilled from the ventilation roadway to the gasification channel. Hole, insert one or more gas injection pipe into the hole and seal the hole, the gas injection pipe is connected with the gas injection system of the mine; during production, the ignition is performed in the gasification channel, and the gas injection tube injects gas into the gasification channel The gasification reaction of coal occurs in the coal wall of the gasification channel, and the generated gas is discharged into the gas channel.
  • a gasification channel that is, an "underground gasification furnace”
  • the technical measures adopted by the invention for continuous and stable production of coal gas in the coal seam are also:
  • the roadway drills a group of gas injection boreholes in the direction of the gas passage.
  • the gas injection pipe is inserted into a certain hole length at the opening to seal the hole, and the rest is a tree hole. Adjacent gas injection boreholes sequentially replace gas injection, and gasification production continues. get on.
  • the technical measures adopted in the present invention for directly producing coal gas from the coal seam are also as follows: In one gasification channel, two or more gas injection pipes are inserted through the gas injection boreholes from a ventilated aisle, and the gas outlet openings are spaced apart The gas inlet end is connected to the gas supply line, and the gas injection pipe successively replaces the gas injection in order to continue the gasification production; two or more gas injection pipes can also be used for gas injection production at the same time.
  • the technical measures adopted by the present invention also include: drilling a row of through-holes into the coal seam from the ventilation roadway located on the floor of the coal seam, the bottom of the hole is in the coal seam, and hydraulic punching, high-pressure water jet drilling or "Reverse combustion” and other technologies make the bottoms of adjacent through-holes communicate with each other and open channels.
  • a "gasification working surface" for direct production of coal gas in a coal seam is composed of two ventilation lanes sharing a gas channel located between them; the gas channel can directly communicate with a gas well alone, It is also possible to share one gas well with two or more gas channels.
  • the present invention has the advantage that it provides a technology for directly constructing coal seam gasification furnaces by using roadways or boreholes in a mine to produce coal gas; personnel can control gasification production in the roadway nearby, and the operation is safe; "Underground gasification of coal” has inherent technical, economic, and environmental problems, as well as poor economic benefits and many accidents caused by direct production of coal from coal mines.
  • the mine and production method have convenient construction, low cost, and strong applicability.
  • Ventilation tunnel 1 is provided with gas supply pipelines, and personnel monitor and control the gasification process in the tunnel; gas channel 2 is used to collect and transport gas; 3 is a gas injection borehole; gas injection pipe 4 is inserted; 5 is gas injection Point; 6 is the gasification channel.
  • the arrow V indicates ventilation, A indicates gas injection, and G indicates gas (the same applies hereinafter).
  • FIG. 1 A production succession method for direct production of coal gas in coal seams.
  • the figure shows that, as shown in Fig. 1, when gas injection holes 3 are injected and gasification channel 6 produces gas, the gasification coal wall recedes to W and communicates with the replacement gas injection holes 3-1. 1 operation, open the gas injection pipe 3-1 gas injection pipe 4-1 gas injection replacement production. When the gasification coal wall backs up to communicate with the replacement gas injection borehole 3-2, the gas injection pipe 4-12 inside it is opened to take over production.
  • FIG. 3 A production succession method for direct production of coal gas in coal seams. The figure shows that from the ventilation tunnel 1 through the gas injection borehole 3, multiple gas injection pipes 4-1, 4-2, 4-3 are inserted into the gasification channel 6, and the gas injection pipe mouth is 5-
  • the gas injection holes 3-1 and 3-2 are the replacement gas injection holes of the gas injection hole 3.
  • the gas injection holes 3-1 contain one or more gas injection pipes 4-1-1 and 4-1- 2.
  • Gas injection borehole 3-2 Built-in gas injection pipes 4-2-1, 4-2-2, 4-2-3 ...;
  • the gas injection borehole 3 is gasified,
  • the gas injection borehole 3-1 that is, the gas injection pipe takes over production, and when the gasification coal The wall retracts to W l, W, -2. W r 3) ...
  • the gas injection hole 3-2 is the gas injection replacement production.
  • FIG. 5 Sectional view of a production replacement method for direct production of coal gas in coal seams. Ventilation roadway 1 is located on the floor of the coal seam. 3-1, 3-2, and 3-3 are gas injection boreholes, and the intersections with gasification channel 6 are 5-1, 5-2, and 5-3, respectively. Gas injection drilling 3-1, 3-2, 3- 3 sequentially replace gas injection production, or simultaneous gas injection production.
  • Figure 6 Diagram of one way to form a gas channel 2 or a gasification channel 6 in a coal seam.
  • a row of auxiliary drill holes 3 is drilled from the ventilation tunnel 1 to the coal seam.
  • the connection line of the bottom of the hole in the coal seam is the design position of the gas passage 1 or the gasification passage 6. Drill the bottom of 3 holes to penetrate through the coal seam.
  • FIG. 7 Open weathered mine.
  • the ventilation roadway 1 and the gas passage 2 are connected to the coal wall 7 of the open-pit mine.
  • Figure 8. Gasification face of independent gas well. Between the general ventilation roadways 10 and 11, every two ventilation roadways 1 share the gas passage 2 therebetween to form a gasification working surface ⁇ ; each gas passage 2 is directly connected to the gas well 12.
  • FIG. 9 Gasification working face of centralized gas well.
  • the figure shows a gas channel 2 on multiple gasification working surfaces, sharing a gas well 12 through a roadway 14.
  • the best way to implement the present invention is to set up a mine production system that directly produces coal gas in coal seams in existing open-pit coal mines.
  • one or more ventilated aisles 1 are excavated from the coal wall 7 of the open-pit mine, and the gas passage 2 is formed by digging the aisle or drilling to form a gasification working surface 13.
  • the coal walls on both sides of the gas channel 2 are gasified, and the generated gas is directly transported from the gas channel 2 to the ground.
  • each of the two ventilation roadways 1 and the gas passage 2 in a coal seam located therebetween constitute a gasification working surface 13; each The gas channel 1 on the gasification working surface communicates with a gas well 12.
  • Gasification production is carried out between the general roadway 1 and the gas channel 2.
  • the gasified coal wall moves upward and backward along the slope of the coal seam.
  • the produced gas enters the gas channel 2 and is transported from the gas well 12 to the ground.
  • This example can be performed by any one of the gas production methods provided by the present invention.
  • the gas injection, injection point back-off, monitoring, and regulation are all performed in the ventilation aisle 1.
  • Example 3 "Gasification working face" of a centralized gas well
  • the gas pass value 2 of two or more gasification working faces is communicated with the same gas well 12 through the roadway 14. Both sides of the gasification gas passage 2 are gasified by the gas production method of the present invention. Coal wall. The produced gas is transported to the surface from the gas passage 2 through the roadway 14 to the gas well 12.

Abstract

The invention relates to a coal mine through which coal gas can be produced directly from coal seam and a coal gas production method through the mine. The mine comprises a ventilation system having an air ventilation shaft and an air ventilation tunnel, a coal gas transporting system having a coal gas passage and an air injecting system having a gasification passage. The gasification passage forms 'an underground gasification oven'. The method comprises following steps: drilling a plurality of bores towards the coal gas passage from the air ventilation passage in coal seam; packing these bores after inserting air injecting pipes into them; igniting coal seam in the gasification passage at the same time injecting gasidants to the gasification passage through the air injecting pipe; sequentially injecting air into gasification passage from air injecting pipes in adjacent bores to obtain continuous gas production. Therefore, technical and environment problems associated with the 'underground coal gasification' can be solved with low cost and difficulties in producing coal directly from underground seam can be avoided.

Description

从煤层直接生产煤气的矿井与生产方法 技术领域  Mine for directly producing coal gas from coal seam and production method
本发明涉及一种煤炭资源的开发方法， 即一种于煤层直接生产煤气的矿井与生产 方法， 属采矿技术。  The invention relates to a method for developing coal resources, that is, a mine and a production method for directly producing coal gas in a coal seam, and belongs to mining technology.
发明背景 Background of the invention
现有煤炭开采矿井， 在煤层内直接生产煤炭， 巷道与生产系统复杂， 投资高， 产 值低， 事故多， 现有于煤层内直接生产煤气的 "煤的地下气化"， 从地面直接向煤层打 钻， 人员远离煤层几百米在地面操作气化生产过程， 气化生产过程难以监测和控制， 无法商业化。  Existing coal mining shafts produce coal directly in coal seams, complicated roadways and production systems, high investment, low output value, and many accidents. The existing "underground gasification of coal" that directly produces coal gas in coal seams directly from the ground to the coal seams Drilling, personnel are hundreds of meters away from the coal seam to operate the gasification production process on the ground. The gasification production process is difficult to monitor and control and cannot be commercialized.
本发明的目的在于提供一种于煤层直接生产煤气的矿井与生产方法， 人员在矿井 内就近操作气化生产， 就近监测、 控制气化过程， 从而既解决 "煤的地下气化" 所存 在的技术、 经济、 环境问题， 又解决产煤矿井存在的问题。  An object of the present invention is to provide a mine and a production method for directly producing coal gas in a coal seam. Personnel operate gasification production nearby in the mine, and monitor and control the gasification process nearby, thereby solving the problems existing in "underground coal gasification". Technical, economic, and environmental problems, and the problems of coal mines.
本发明公开内容 Disclosure of the invention
本发明气化矿井的主要内容是：  The main contents of the gasification mine of the present invention are:
1、 矿井包括由通风井和通风巷道构成的矿井通风系统， 通风系统同时排水、 运输 和提升， 提供人员在井下作业的条件；  1. The mine includes a mine ventilation system consisting of a ventilation shaft and a ventilation roadway. The ventilation system drains, transports and lifts at the same time, providing conditions for personnel to work underground.
2、 矿井包括由煤气通道 （ "通道 "一词包括管道、 井筒、 巷道、 钻孔或其它方式 形成的孔洞， 以下同）构成的井下煤气运输和流至地面的煤气运输系统， 以及由注气 钻孔和气化通道构成的注气系统；  2. Mine includes underground gas transportation and gas transportation system to the ground composed of gas passages (the term "channel" includes pipelines, shafts, roadways, boreholes or other forms of holes, the same applies hereinafter), and by gas injection Gas injection system consisting of boreholes and gasification channels;
3、 矿井以煤层内的气化通道构成 "地下气化炉"， 直接生产煤气， 其一端与注气 钻孔相连接， 注入气化物， 生产的煤气由另一端排入煤气通道， 运至地面；  3. The mine uses the gasification channel in the coal seam to form an "underground gasifier", which produces gas directly. One end of the mine is connected to a gas injection borehole. Gas is injected. The produced gas is discharged into the gas channel from the other end and transported to the surface. ;
4、 矿井内生产煤气时， 人员在其通风系统内操作气化过程， 进行矿务工程施工作 业。  4. When gas is produced in the mine, personnel operate the gasification process in their ventilation system and carry out mining engineering operations.
本发明 "气化矿井" 生产煤气的方法为： 煤层内有气化通道（即 "地下气化炉 "）， 其一端与煤气通道相连， 另一端， 由通风巷道向气化通道钻注气钻孔， 孔内插入一根 或一根以上的注气管后封孔， 注气管与矿井的注气系统相连接； 生产时， 在气化通道 内点火， 由注气管向气化通道内注入气化物， 气化通道煤壁发生煤的气化反应， 生成 的煤气排入煤气通道。  The method for producing gas in the "gasification mine" of the present invention is as follows: there is a gasification channel (that is, an "underground gasification furnace") in the coal seam, one end of which is connected to the gas channel, and the other end is drilled from the ventilation roadway to the gasification channel. Hole, insert one or more gas injection pipe into the hole and seal the hole, the gas injection pipe is connected with the gas injection system of the mine; during production, the ignition is performed in the gasification channel, and the gas injection tube injects gas into the gasification channel The gasification reaction of coal occurs in the coal wall of the gasification channel, and the generated gas is discharged into the gas channel.
本发明所采取的于煤层连续、 稳定生产煤气的技术措施还在于： 由煤层内的通风 巷道向煤气通道方向钻一组注气钻孔， 其开口处一定孔长内插入注气管后封孔， 其余 部分为棵孔； 相邻的注气钻孔按序接替注气， 气化生产持续进行. The technical measures adopted by the invention for continuous and stable production of coal gas in the coal seam are also: The roadway drills a group of gas injection boreholes in the direction of the gas passage. The gas injection pipe is inserted into a certain hole length at the opening to seal the hole, and the rest is a tree hole. Adjacent gas injection boreholes sequentially replace gas injection, and gasification production continues. get on.
本发明所采取的于煤层直接生产煤气的技术措施还在于： 在一个气化通道内， 自 通风巷道过注气钻孔置入两根或两根以上的注气管， 其出气管口相距一段距离， 进气 端与气化物供给管线相联， 逐根注气管按序接替注气， 使气化生产持续进行； 也可以 两根或两根以上注气管同时注气生产。  The technical measures adopted in the present invention for directly producing coal gas from the coal seam are also as follows: In one gasification channel, two or more gas injection pipes are inserted through the gas injection boreholes from a ventilated aisle, and the gas outlet openings are spaced apart The gas inlet end is connected to the gas supply line, and the gas injection pipe successively replaces the gas injection in order to continue the gasification production; two or more gas injection pipes can also be used for gas injection production at the same time.
本发明所采取的技术措施还在于： 由位于煤层底板的通风巷道向煤层钻一排贯通 钻孔， 其孔底在煤层内， 采用贯通钻孔孔底水力冲孔、 高压水射流钻孔或 "反向燃烧" 等技术， 使各相邻贯通钻孔孔底相互连通， 开成通道。  The technical measures adopted by the present invention also include: drilling a row of through-holes into the coal seam from the ventilation roadway located on the floor of the coal seam, the bottom of the hole is in the coal seam, and hydraulic punching, high-pressure water jet drilling or "Reverse combustion" and other technologies make the bottoms of adjacent through-holes communicate with each other and open channels.
本发明所采取的技术措施还在于： 一种煤层内直接生产煤气的 "气化工作面" 由 两条通风巷道共用位于它们中间的一条煤气通道构成； 煤气通道可以单独与一个煤气 井直接连通， 也可两个或两个以上的煤气通道共用一个煤气井。  The technical measures adopted by the present invention are also: a "gasification working surface" for direct production of coal gas in a coal seam is composed of two ventilation lanes sharing a gas channel located between them; the gas channel can directly communicate with a gas well alone, It is also possible to share one gas well with two or more gas channels.
本发明与已有技术相比的优点在于， 提供了于矿井内以巷道或钻孔直接构筑煤层 气化炉生产煤气的技术； 人员可在巷道内就近控制气化生产， 操作安全； 解决了 "煤 的地下气化" 所固有的技术、 经济和环境问题以及煤矿直接生产煤炭带来的经济效益 差、 事故多等问题。 该矿井及生产方法施工便利， 成本低， 适用性强。  Compared with the prior art, the present invention has the advantage that it provides a technology for directly constructing coal seam gasification furnaces by using roadways or boreholes in a mine to produce coal gas; personnel can control gasification production in the roadway nearby, and the operation is safe; "Underground gasification of coal" has inherent technical, economic, and environmental problems, as well as poor economic benefits and many accidents caused by direct production of coal from coal mines. The mine and production method have convenient construction, low cost, and strong applicability.
附图的简要说明 Brief description of the drawings
下面， 结合附图对本发明作进一步的描述， 并说明应用本发明的最好途径。  In the following, the present invention is further described with reference to the drawings, and the best way to apply the present invention is explained.
图 1、 于煤层直接生产煤气的矿井与生产方法巷道（通道）布置简图。 其中通风巷 道 1 内设有气化物供给管线， 人员于该巷监测、 控制气化过程； 煤气通道 2用于收集、 运输煤气； 3 为注气钻孔， 内插注气管 4 ; 5 为注气点； 6 为气化通道。 图中箭头标 V 为通风， A为注气， G为煤气（以下同）。  Figure 1. Simplified layout of roadways (channels) for mines and production methods that directly produce coal gas in coal seams. Ventilation tunnel 1 is provided with gas supply pipelines, and personnel monitor and control the gasification process in the tunnel; gas channel 2 is used to collect and transport gas; 3 is a gas injection borehole; gas injection pipe 4 is inserted; 5 is gas injection Point; 6 is the gasification channel. In the figure, the arrow V indicates ventilation, A indicates gas injection, and G indicates gas (the same applies hereinafter).
图 2、 于煤层内直接生产煤气的一种生产接替方式。 该图显示， 当如图 1所示， 以 注气钻孔 3注气， 气化通道 6生产煤气，其气化煤壁后退至 W 与接替注气钻孔 3-1相 通时，于通风巷道 1 内操作， 开启注气钻孔 3-1的注气管 4-1注气接替生产。 当气化煤 壁后退至 与接替注气钻孔 3- 2相通时， 即开启其内的注气管 4一 2接替生产。  Figure 2. A production succession method for direct production of coal gas in coal seams. The figure shows that, as shown in Fig. 1, when gas injection holes 3 are injected and gasification channel 6 produces gas, the gasification coal wall recedes to W and communicates with the replacement gas injection holes 3-1. 1 operation, open the gas injection pipe 3-1 gas injection pipe 4-1 gas injection replacement production. When the gasification coal wall backs up to communicate with the replacement gas injection borehole 3-2, the gas injection pipe 4-12 inside it is opened to take over production.
图 3、 于煤层内直接生产煤气的一种生产接替方式。 图中显示， 由通风巷道 1 , 过 注气钻孔 3， 向气化通道 6内插入多根注气管 4-1、 4-2、 4-3 ， 其注气管口为 5- Figure 3. A production succession method for direct production of coal gas in coal seams. The figure shows that from the ventilation tunnel 1 through the gas injection borehole 3, multiple gas injection pipes 4-1, 4-2, 4-3 are inserted into the gasification channel 6, and the gas injection pipe mouth is 5-
1、 5-2、 5-3 。 可以一个注气管注气生产， 其余注气管按序逐管注气接替生产； 也可以两个或两个以上的注气管同时注气生产。 图 4、 于煤层内直接生产煤气的一种生产接替方式。 其中注气钻孔 3-1、 3-2 为注气钻孔 3的接替注气钻孔， 注气钻孔 3— 1内置一条或一条以上的注气管 4-1-1、 4-1-2、 4-1-3; 注气钻孔 3-2 内置入注气管 4-2- 1 、 4-2-2、 4-2-3……； 当注气钻孔 3气化生产， 气化煤壁后退至 W-l、 W- 2、 W-3……时， 与相邻注气钻孔 3-1相通后， 注 气钻孔 3-1即注气管接替生产， 而当其气化煤壁后退至 W l、 W,-2. Wr3 ) ……与注气 钻孔 3-2相通后， 注气钻孔 3-2即注气接替生产。 1, 5-2, 5-3. One gas injection pipe can be used for gas production, and the other gas injection pipes can be successively pipe-injected to succeed in production; or two or more gas injection pipes can be injected simultaneously for production. Figure 4. A production succession method for direct production of coal gas in coal seams. The gas injection holes 3-1 and 3-2 are the replacement gas injection holes of the gas injection hole 3. The gas injection holes 3-1 contain one or more gas injection pipes 4-1-1 and 4-1- 2. 4-1-3; Gas injection borehole 3-2 Built-in gas injection pipes 4-2-1, 4-2-2, 4-2-3 ...; When the gas injection borehole 3 is gasified, When the coal wall recedes to Wl, W-2, W-3, etc., after communicating with the adjacent gas injection borehole 3-1, the gas injection borehole 3-1, that is, the gas injection pipe takes over production, and when the gasification coal The wall retracts to W l, W, -2. W r 3) ... After communicating with the gas injection hole 3-2, the gas injection hole 3-2 is the gas injection replacement production.
图 5、 于煤层内直接生产煤气的一种生产接替方式剖面图。 通风巷道 1位于煤层底 板， 3-1、 3-2、 3- 3为注气钻孔， 其与气化通道 6的交点分别为 5-1、 5-2、 5-3。 注气 钻孔 3-1、 3-2、 3- 3按序接替注气生产， 或同时注气生产。  Figure 5. Sectional view of a production replacement method for direct production of coal gas in coal seams. Ventilation roadway 1 is located on the floor of the coal seam. 3-1, 3-2, and 3-3 are gas injection boreholes, and the intersections with gasification channel 6 are 5-1, 5-2, and 5-3, respectively. Gas injection drilling 3-1, 3-2, 3- 3 sequentially replace gas injection production, or simultaneous gas injection production.
图 6、 于煤层内形成煤气通道 2或气化通道 6的一种方式图。 图中由通风巷道 1向 煤层钻一排辅助钻孔 3,其在煤层内的孔底连线为煤气通道 1或气化通道 6的设计位置， 以物理方法、 化学方法或电法使各辅助钻孔 3孔底于煤层内贯通。  Figure 6. Diagram of one way to form a gas channel 2 or a gasification channel 6 in a coal seam. In the figure, a row of auxiliary drill holes 3 is drilled from the ventilation tunnel 1 to the coal seam. The connection line of the bottom of the hole in the coal seam is the design position of the gas passage 1 or the gasification passage 6. Drill the bottom of 3 holes to penetrate through the coal seam.
图 7、 露天气化矿井。 其中通风巷道 1、 煤气通道 2均与露天矿的煤墙 7相连。 图 8、 独立煤气井气化工作面。 总通风巷道 10和 11之间， 每两条通风巷道 1共用 其间的煤气通道 2, 构成气化工作面 Π; 每条煤气通道 2直接与煤气井 12相连。  Figure 7. Open weathered mine. The ventilation roadway 1 and the gas passage 2 are connected to the coal wall 7 of the open-pit mine. Figure 8. Gasification face of independent gas well. Between the general ventilation roadways 10 and 11, every two ventilation roadways 1 share the gas passage 2 therebetween to form a gasification working surface Π; each gas passage 2 is directly connected to the gas well 12.
图 9、 集中煤气井气化工作面。 该图显示多个气化工作面的煤气通道 2, 通过巷道 14共用一条煤气井 12。  Figure 9. Gasification working face of centralized gas well. The figure shows a gas channel 2 on multiple gasification working surfaces, sharing a gas well 12 through a roadway 14.
详细叙述 Elaborate
实施例 1、 露天气化矿井  Example 1. Open weathered mine
实施本发明的最好途径是在现有露天煤矿， 建立于煤层直接生产煤气的矿井生产 系统。 如图 7所示， 由露天矿的煤墙 7掘出一条或一条以上的通风巷道 1, 以掘进巷道 或钻孔形成其间的煤气通道 2, 构成气化工作面 13, 采用本发明所迷的煤气生产方法， 气化煤气通道 2两侧的煤壁， 生成的煤气由煤气通道 2直接运至地面。  The best way to implement the present invention is to set up a mine production system that directly produces coal gas in coal seams in existing open-pit coal mines. As shown in FIG. 7, one or more ventilated aisles 1 are excavated from the coal wall 7 of the open-pit mine, and the gas passage 2 is formed by digging the aisle or drilling to form a gasification working surface 13. In the gas production method, the coal walls on both sides of the gas channel 2 are gasified, and the generated gas is directly transported from the gas channel 2 to the ground.
实施例 2、 独立煤气井 "气化工作面"  Example 2. Independent Gas Well "Gasification Working Face"
如图 8所示， 矿井内总进风巷道 10和总回风巷道 11之间， 每两条通风巷道 1和 位于其间的一条煤层内的煤气通道 2, 构成一个气化工作面 13; 每个气化工作面的煤 气通道 1与一个煤气井 12相通。 气化生产在通用巷道 1和煤气通道 2之间进行， 气化 煤壁沿煤层的倾斜方向向上、 向后退， 生产的煤气进入煤气通道 2, 并从煤气井 12运 至地面。 该实旄例可用本发明所给出的煤气生产方法中的任意一种进行。 注气、 注气 点后退、 监控、 调控等工序均在通风巷道 1内进行。 实施例 3、 集中煤气井 "气化工作面" As shown in FIG. 8, between the total air inlet roadway 10 and the total return airway 11 in the mine, each of the two ventilation roadways 1 and the gas passage 2 in a coal seam located therebetween constitute a gasification working surface 13; each The gas channel 1 on the gasification working surface communicates with a gas well 12. Gasification production is carried out between the general roadway 1 and the gas channel 2. The gasified coal wall moves upward and backward along the slope of the coal seam. The produced gas enters the gas channel 2 and is transported from the gas well 12 to the ground. This example can be performed by any one of the gas production methods provided by the present invention. The gas injection, injection point back-off, monitoring, and regulation are all performed in the ventilation aisle 1. Example 3, "Gasification working face" of a centralized gas well
如图 9所示的两个或两个以上的气化工作面的煤气通值 2 , 通过巷道 14与同一条 煤气井 12相通， 采用本发明所述的煤气生产方法气化煤气通道 2两侧的煤壁。 生产的 煤气由煤气通道 2 , 经过巷道 14至煤气井 12运至地面。  As shown in FIG. 9, the gas pass value 2 of two or more gasification working faces is communicated with the same gas well 12 through the roadway 14. Both sides of the gasification gas passage 2 are gasified by the gas production method of the present invention. Coal wall. The produced gas is transported to the surface from the gas passage 2 through the roadway 14 to the gas well 12.

Claims

权 利 要 求 Rights request
1. 一种于煤层直接生产煤气的矿井， 其特征为： 1. A mine that directly produces coal gas in a coal seam, characterized by:
( 1 )矿井有由通风井和通风巷道（ 1 ) 构成的矿井通风系统， 提供人员在井下作 业的条件；  (1) the mine has a mine ventilation system consisting of a ventilation shaft and a ventilation roadway (1) to provide personnel with conditions for working underground;
( 2 )矿井有由煤气通道（2 )构成的井下煤气运输和流至地面的煤气运输系统， 以及由注气钻孔（3)和气化通道（6 )构成的注气系统：  (2) The mine has a underground gas transportation system consisting of a gas channel (2) and a gas transportation system flowing to the surface, and a gas injection system consisting of a gas injection borehole (3) and a gasification channel (6):
( 3 )矿井以煤气层内的气化通道（6 ) 构成地下气化炉， 直接生产煤气， 其一端 与注气钻孔（3 )相连接， 注入气化物， 生产的煤气由其另一端排入煤气通道， 运至地 面；  (3) The mine uses the gasification channel (6) in the gas layer to form an underground gasification furnace to directly produce coal gas, one end of which is connected to a gas injection borehole (3), injects gasification, and the produced gas is discharged from the other end Into the gas passage and transported to the ground;
( 4 )矿井内生产煤气时， 人员在其通风系统内操作气化生产过程， 进行矿务工程 施工作业。  (4) When gas is produced in the mine, personnel operate the gasification production process in their ventilation system and carry out mining engineering construction operations.
2. 一种如权利要求 1 所述矿井内于煤层直接生产煤气的方法， 其特征在于：煤层 内有气化通道（6 ), 其一端与煤气通道（2 )相连； 另一端由通风巷道（ 1 ) 向气化通 道（ 6 )钻注气钻孔（ 3 ), 孔内插入一根或一根以上的注气管 （ 4 )后封孔， 注气管（ 4 ) 与矿井的注气系统相连接； 生产时， 在气化通道（6 ) 内点火， 由注气管 （4 ) 向气化 通道（6 ) 内注入气化物， 气化通道（6 ) 两侧煤壁发生煤的气化反应， 生成的煤气排 入煤气通道（ 2 )。  2. A method for directly producing gas from a coal seam in a mine according to claim 1, characterized in that: there is a gasification passage (6) in the coal seam, one end of which is connected to the gas passage (2); and the other end is a ventilation roadway ( 1) Drill a gas injection borehole (3) into the gasification channel (6), insert one or more gas injection pipes (4) into the holes, and seal the holes, and the gas injection pipe (4) is connected to the gas injection system of the mine ; During production, the gas is ignited in the gasification channel (6), and the gas injection pipe (4) is injected into the gasification channel (6). The gasification reaction of coal occurs on the coal walls on both sides of the gasification channel (6) to generate The gas is discharged into the gas channel (2).
3. 一种如权利要求 1、 2 所述的于煤层直接生产煤气的生产接替方法， 其特征在 于： 由煤层内的通风巷道（1 )向煤气通道（2 )方向钻一组注气钻孔（ 3、 3-1、 3-2 ····.. ), 其开口处一定孔长内分别插入注气管 （4、 4-1、 4-2 ··..·. )后封孔， 其余部分为棵孔； 相邻的注气钻孔按序接替注气， 气化生产持续进行。  3. A production succession method for direct production of coal gas in a coal seam according to claim 1, 2, characterized in that: a group of gas injection boreholes are drilled from the ventilation roadway (1) in the coal seam to the direction of the gas passage (2) (3, 3-1, 3-2 ···· ..), insert a gas injection tube (4, 4-1, 4-2 ·······) in a certain hole length at the opening and seal the hole, The remaining part is a tree hole; adjacent gas injection boreholes successively replace gas injection, and gasification production continues.
4. 一种如权利要求 1、 2 所述的于煤层内直接生产煤气的生产接替方法， 其特征 在于： 在一个气化通道（ 6 ) 内， 自通风巷道（ 1 )过注气钻孔（ 3 )置入两根或两根以 上的注气管 （4、 4-1, 4-2……、, 其出气管口相距一段离； 进气端与气化物供给管线 相连， 逐注气管按序接替注气， 使气化生产持续进行； 也可两根或两根以上注气管同 时注气生产。  4. A production succession method for directly producing gas in a coal seam according to claim 1, 2, characterized in that: in a gasification channel (6), a self-ventilated aisle (1) passes through a gas injection borehole ( 3) Place two or more gas injection pipes (4, 4-1, 4-2 ... ,, and the gas outlets are separated by a distance; the inlet end is connected to the gas supply line, and the gas injection pipes are sequentially Replace gas injection to make gasification production continue; two or more gas injection pipes can also be used for gas injection production at the same time.
5. 一种如权利要求 1、 2、 3、 4 所述的于煤层直接生产煤气的矿井的煤层内通道 形成的方法， 其特征在于： 由位于煤层底板的通风巷道（ 1 ) 向煤层钻一排贯通注气钻 孔（3), 其孔底在煤层内； 采用贯通钻孔（ 3 )孔底水力冲孔、 高压水射流钻孔或 "反 向燃烧" 等技术， 使各相邻贯通钻孔孔底相互连通， 形成通道， 5. A method for forming a channel in a coal seam of a mine that directly produces gas from a coal seam according to claim 1, 2, 3, and 4, characterized in that a ventilation roadway (1) located on the floor of the coal seam is drilled into the coal seam. Exhaust gas injection borehole (3), the bottom of the hole is in the coal seam; the bottom of the borehole (3) is used for hydraulic punching, high-pressure water jet drilling or "reverse" "Combustion" and other technologies, make the bottoms of adjacent through-holes communicate with each other to form channels,
6. 一种如权利要求 1、 2、 3、 4所述的于煤层内直接生产煤气的气化工作面（13), 其特征在于： 工作面由两条通风巷道（1 )共用位于它们中间的一条煤气通道（2 )构 成； 每个工作面的煤气通道（2 )可以单独与一个煤气井 （12) 直接连通， 也可两个或 两个以上的工作面的煤气通道（2 )共用一个煤气井（12)。  6. A gasification working surface (13) for directly producing coal gas in a coal seam according to claim 1, 2, 3, and 4, characterized in that the working surface is shared between two ventilation roadways (1) and is located between them The gas channel (2) of each working face can be directly connected to a gas well (12) separately, or two or more gas channels (2) of the working face can be shared. Gas well (12).
PCT/CN1999/000072 1998-05-29 1999-05-28 A coal mine through which coal gas can be produced directly from coal seam and a coal gas production method through the mine WO1999063200A1 (en)

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