WO2022242056A1 - 一种实现工作面回采过程高位钻孔连续抽采瓦斯的方法 - Google Patents

一种实现工作面回采过程高位钻孔连续抽采瓦斯的方法 Download PDF

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WO2022242056A1
WO2022242056A1 PCT/CN2021/129317 CN2021129317W WO2022242056A1 WO 2022242056 A1 WO2022242056 A1 WO 2022242056A1 CN 2021129317 W CN2021129317 W CN 2021129317W WO 2022242056 A1 WO2022242056 A1 WO 2022242056A1
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drilling
roadway
gas
level
roof
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PCT/CN2021/129317
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English (en)
French (fr)
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王磊
张永将
刘军
李少波
任启寒
朱传奇
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安徽理工大学
中煤科工集团重庆研究院有限公司
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Publication of WO2022242056A1 publication Critical patent/WO2022242056A1/zh

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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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C41/00—Methods of underground or surface mining; Layouts therefor
    • E21C41/16—Methods of underground mining; Layouts therefor
    • E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

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  • the invention relates to the technical field of coal mine mining, in particular to a method for realizing the continuous extraction of gas from high-level drilling in the mining process of a working face.
  • Gas control methods include gas drainage, coal seam water injection, mining of liberated seams, construction of high-level drilling, etc.
  • the high-level drilling is mainly used to drain the gas in the goaf during the normal recovery of the working face, and it is a gas control method with high gas drainage efficiency.
  • the existing high-level drilling technology for gas drainage in gobs needs to determine the appropriate final hole location. If the location of the final hole of the high-level drilling is not suitable, the fractures are not fully developed, and the permeability is low, the concentration and flow rate of gas drainage will be low, and the purpose of gas control will not be achieved.
  • the high-level boreholes constructed are affected by the recovery of the working face, and the boreholes located on the side of the roadway fail, and there will be problems such as discontinuous drainage, which seriously affects the drainage efficiency.
  • the technical problem to be solved by the present invention is to provide a method for realizing the continuous extraction of gas from high-level drilling in the mining process of the working face. Based on this method, it is possible to realize all-round detection and extraction of gas in the goaf, and realize the continuous and uninterrupted mining process of the working face. Drainage, thereby improving the efficiency and concentration of gas drainage.
  • a method for realizing the continuous extraction of gas from high-level boreholes in the recovery process of a working face comprising the following steps:
  • each drilling site constructs a group of roadway high-position drilling groups; wherein, each group of roadway high-position drilling groups includes three roadway high-position drilling holes, and the three roadway high-position drilling The opening point of the borehole is located at the corresponding drilling field on the side of the return air roadway, and the final hole point is located at different heights in the goaf fissure zone above the coal seam;
  • a roof high-level drilling is constructed at the roadway roof above each drilling site; the opening point of the roof high-level drilling is located on the corresponding roadway roof, and the final hole point is located in the fissure zone area of the goaf above the coal seam ;
  • a drilling field is set at every interval of 20m on the side of the return air roadway, and the specific quantity of the drilling field is determined according to the length of the mining face; and, in the adjacent drilling field
  • the layout of the drilling adopts the "stubble pressing" arrangement.
  • a group of opening points of the high-level drilling group of the roadway is arranged at intervals of 20m on the side of the return air roadway, and in the corresponding roadway A hole point for high-level drilling on the roof is arranged at an interval of 20m on the roof.
  • the three high-level drilling opening points of the roadway in the same group are arranged in a row, and the distance between two adjacent opening points is 1.0m .
  • the opening points of the three roadway high drilling holes in the same group are specifically located on the side of the return air roadway, at a position 0.5m away from the roadway roof, and the final hole
  • the points are specifically located in the fissure zone area of the goaf above the coal seam, and at the heights of 20m, 30m, and 40m from the coal seam respectively.
  • the opening point of each roof high-level drilling is located on the corresponding roadway roof and 1.0m away from the side of the return air roadway, and the final hole point is located in the coal seam In the fissure zone area of the upper goaf and at a height of 40m from the coal seam.
  • the working face advances along with the recovery work; when passing through a drilling site, three roadway high-level drillings of the drilling site fail; At this time, connect the three high-level drilling holes in the roadway of the next drilling site to connect to the drainage until all the mining of the coal mining face is completed.
  • the borehole diameter of the high-level drill hole in the roadway and the high-level drill hole on the roof is 94 mm, and the diameter of the gas drainage pipe is 72 mm.
  • concrete mortar materials are used to seal the holes; after the holes are sealed, the casing and the gas drainage pipeline are lowered and connected The main drainage pipeline is used for gas drainage.
  • the water-cement ratio of the cement mortar material is 1:1; when grouting and sealing the holes, the total amount of grouting for each high-level drilling is 5-10 m 3 .
  • the present invention has the advantages that: the layout of the high-level drilling in the present invention adopts the method of "stub pressing arrangement" combined with “roof layout of the roadway", and the end holes of the high-level drilling are located in different layers of the fissure zone above the goaf It can realize all-round detection and extraction of gas in the goaf, ensure that high-level drilling can continuously extract high-concentration gas in the gas-enriched area, and realize precise gas control at the working face; the specific advantages are as follows:
  • the first group of 20m apart when the first group of high-level boreholes arranged on the side of the return airway are affected by the recovery of the working face, and the boreholes on the side and the drainage pipeline are damaged and cannot continue to be pumped, the first group of 20m apart
  • the final holes of the high-level drilling holes of the second group of roadways are located in the gas-enriched area of the fracture zone, and the continuous drainage is realized through the high-level drilling holes of the second group of roadways to ensure that the gas concentration of the drainage pipeline is always at a high concentration level;
  • the third group will continue the drainage, and so on, all the gas drainage drilling pipes are connected to the gas drainage main pipe to realize the drainage;
  • the end holes of each group of high-level drilling holes on the side of the return air roadway are located at different layers in the fissure zone above the goaf, which can realize all-round detection and extraction of gas in the goaf and ensure high-level drilling Capable of continuous extraction of high-concentration gas in gas-rich areas;
  • a roof high-position borehole is also arranged at the upper roadway roof of each group of roadway high-position boreholes; The high-level drilling on the roof of the roadway roof can still continue to drain the gas in the fissure zone of the goaf, realizing continuous drainage.
  • Fig. 1 is the elevation layout schematic diagram of each high-level borehole in embodiment 1;
  • Fig. 2 is a schematic diagram of the facade structure of the first group of high-level boreholes in Fig. 1;
  • Fig. 3 is a diagram showing the positional relationship between the opening points of the high-level drilling holes in the same group on the side of the return air roadway in embodiment 1.
  • 1 is the working face
  • 2 is the high-level drilling group of the roadway
  • 21 is the high-level drilling of the roadway
  • 211 is the 1# drilling
  • 212 is the 2# drilling
  • 213 is the 3# drilling
  • 3 is the high-level drilling of the roof
  • 31 is the 4# drilling hole
  • 4 is the return air roadway side
  • 41 is the drilling site
  • 411 is the first drilling site
  • 412 is the second drilling site
  • 413 is the third drilling site
  • 414 is the fourth drilling site field
  • 5 is the roof of the roadway
  • 6 is the fissure zone area of the goaf.
  • each drilling field 41 constructs a group of roadway high-level drilling groups 2.
  • each group of roadway high-level drilling groups 2 includes three roadway high-level boreholes 21, and the opening points of the three roadway high-level drilling holes 21 are arranged in rows, and the adjacent two opening points The position spacing is 1.0m.
  • the opening points of the three roadway high-level drill holes 21 in the same group are located on the side of the return air roadway 4, at a height of 0.5m from the position of the roadway roof 5, and the final hole point is located in the goaf fissure zone area 6 above the coal seam, and 20m, 30m, 40m heights from the coal seam respectively.
  • a roof high-position borehole 3 respectively at the roadway roof 5 places above each drilling site 41.
  • the opening point of the roof high drill hole 3 is located on the corresponding roadway roof 5, and is 1.0m away from the position of the return air roadway side 4, and the final hole point is located in the goaf fissure zone area 6 above the coal seam, and is 40m away from the coal seam place.
  • a group of opening points of the high-level drilling holes 2 of the roadway are arranged at intervals of 20 m on the side of the return air roadway 4, and a high-level drilling hole 3 of the roof is arranged at intervals of 20 m at the corresponding roadway roof 5 opening point.
  • the borehole diameters of the high-level drill holes 21 in the roadway and the high-level drill holes 3 on the roof are 94 mm, and the diameter of the gas drainage pipe is 72 mm.
  • cement mortar material is used to seal the holes. After the hole is sealed, lower the casing and gas drainage pipeline, and connect the main drainage pipeline for gas drainage. At the same time, the water-cement ratio of the cement mortar material is 1:1; when grouting and sealing the holes, the total amount of grouting for each high-level drilling is 5-10m 3 .
  • first in the first drill field 411 construct the three roadway high-level boreholes 21 of the first group, named respectively as 1# borehole 211, 2# borehole 212, and 3# borehole 213; wherein, 1# The opening points of borehole 211, 2# borehole 212, and 3# borehole 213 are located on the side 4 of the return air roadway, at a height of 0.5m from the roadway roof 5, and the final hole point of 1# borehole 211 is located above the coal seam.
  • the final hole point of the 2# drill hole 212 is located in the goaf fissure zone area above the coal seam 6, at a vertical height of 30m from the coal seam, and the final hole point of the 3# drill hole 213 is located above the coal seam 6. At the vertical height of 40m from the coal seam in the fissure zone area of the goaf.
  • the opening point is located on the roadway roof 5 and 1.0m away from the side of the return air roadway 4, and the final hole point is located at the goaf fissure zone area 6 above the coal seam at a vertical height of 40m from the coal seam, as shown in Figure 2.
  • the second drilling site 412, the third drilling site 413, and the fourth drilling site 414 are sequentially implemented in the above-mentioned manner.
  • the second, third, and fourth groups of high-level drilling 21 in the roadway implement the second, third, and fourth high-level drilling 3 on the roof 5 of the corresponding roadway, as shown in FIG. 1 .
  • the stubble pressing arrangement is adopted between each group of drilling holes in sequence.
  • the working face 1 of the coal seam is located within the return air roadway side 4
  • the roadway roof 5 exists in the adjacent rock formation above the return air roadway side 4
  • the goaf fissure zone region 6 is an area on the roadway roof 5", which are common knowledge in the art, and will not be repeated here.

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Abstract

本发明提供了一种实现工作面回采过程高位钻孔连续抽采瓦斯的方法，包括如下步骤：(1)在回风巷道帮上开设钻场，每个钻场施工三个巷道高位钻孔；钻孔开孔点位于回风巷道帮上，终孔点位于采空区裂隙带区域的不同高度位置；(2)每个钻场上方的巷道顶板分别施工一个顶板高位钻孔；钻孔开孔点位于巷道顶板，终孔点位于采空区裂隙带区域；(3)在施工完成的高位钻孔内安装套管、瓦斯抽放管；同时，在孔口连接瓦斯浓度在线监测装置；(4)进行回采工作，连续抽采瓦斯。本发明高位钻孔的布置通过采取"压茬布置"结合"顶板布孔"的方式，且钻孔终孔位于采空区上方裂隙带不同层位，能够实现对采空区瓦斯全方位探测抽采，保证连续抽采瓦斯。

Description

一种实现工作面回采过程高位钻孔连续抽采瓦斯的方法 技术领域
本发明涉及煤矿开采技术领域，尤其涉及一种实现工作面回采过程高位钻孔连续抽采瓦斯的方法。
背景技术
矿井灾害尤其瓦斯动力灾害最为严重。瓦斯治理方法包括瓦斯抽放、煤层注水、开采解放层、施工高位钻孔等。其中，高位钻孔主要用于抽采工作面正常回采期间采空区瓦斯，是瓦斯抽放效率较高的瓦斯治理方法。
现有的高位钻孔抽采采空区瓦斯技术，需要确定合适的终孔位置。若高位钻孔终孔布置位置不合适，裂隙发育不充分、渗透率低，会导致瓦斯抽采浓度和流量较低，达不到瓦斯治理的目的。
并且，在工作面回采过程中，施工的高位钻孔受到工作面回采的影响，位于巷道帮上的钻孔失效，会出现抽采不连续等问题，严重影响抽采效率。
据此，目前急需一种能够实现工作面回采过程高位钻孔连续抽采瓦斯的方法，以提高瓦斯抽采量和瓦斯抽采浓度，降低采空区瓦斯涌出，杜绝采空区发生火灾，实现矿井瓦斯灾害治理。
发明内容
本发明所要解决的技术问题在于提供一种实现工作面回采过程高位钻孔连续抽采瓦斯的方法，基于该方法可以实现对采空区瓦斯全方位探测抽采，实现工作面回采过程连续不间断抽采，进而提高瓦斯抽采效率和抽采浓度。
本发明采用以下技术方案解决上述技术问题：
一种实现工作面回采过程高位钻孔连续抽采瓦斯的方法，包括如下步骤：
(1)在回风巷道帮上开设若干钻场，每个钻场施工一组巷道高位钻孔群；其中，每组巷道高位钻孔群包括三个巷道高位钻孔，所述三个巷道高位钻孔的开孔点位于所述回风巷道帮上的相应钻场处，终孔点位于煤层上方采空区裂隙带区域的不同高度位置；
(2)在每个钻场上方的巷道顶板处分别施工一个顶板高位钻孔；其中，顶板高位钻孔的开孔点位于相应的巷道顶板上，终孔点位于煤层上方采空区裂隙带区域；
(3)在施工完成的巷道高位钻孔与顶板高位钻孔内分别安装套管、瓦斯抽放管，用以抽采瓦斯；同时，将四个钻孔孔口连接瓦斯浓度在线监测装置，用于监测显示每个钻孔瓦斯浓度；
(4)开始进行工作面回采工作，连续抽采瓦斯。
作为本发明的优选方式之一，所述步骤(1)中，在回风巷道帮上每间隔20m开设一钻场，钻场的具体数量根据回采工作面长度确定；并且，相邻钻场中钻孔的布置采用“压茬”布置。
作为本发明的优选方式之一，所述步骤(1)和步骤(2)中，在回风巷道帮上每间隔20m布置一组所述巷道高位钻孔群的开孔点，在相应的巷道顶板处每间隔20m布置一个顶板高位钻孔的开孔点。
作为本发明的优选方式之一，所述步骤(1)中，同组的三个所述巷道高位钻孔开孔点成排布置，并且，相邻的两个开孔点位置间距为1.0m。
作为本发明的优选方式之一，所述步骤(1)中，同组的三个巷道高位钻孔的开孔点具体位于回风巷道帮上、距离巷道顶板0.5m高度的位置处，终孔点具体位于煤层上方采空区裂隙带区域、且分别距离煤层20m、30m、40m高度的位置处。
作为本发明的优选方式之一，所述步骤(2)中，每个顶板高位钻孔的开孔点位于相应的巷道顶板上、且距离回风巷道帮1.0m位置处，终孔点位于煤层上方采空区裂隙带区域、且距离煤层40m高度的位置处。
作为本发明的优选方式之一，所述步骤(4)中，回采过程中，工作面随着回采工作向前推进；当经过一个钻场时，该钻场的三个巷道高位钻孔失效；此时，连接下一个钻场的三个巷道高位钻孔以接上抽采，直至采煤工作面全部回采结束。
作为本发明的优选方式之一，所述巷道高位钻孔与顶板高位钻孔的钻孔孔径为94mm，瓦斯抽放管的直径为72mm。
作为本发明的优选方式之一，当所述巷道高位钻孔和顶板高位钻孔全部施工完成，具体采取水泥砂浆材料进行封孔；封孔后，下放套管与瓦斯抽放管路，并连接总抽放管路进行瓦斯抽采。
作为本发明的优选方式之一，所述水泥砂浆材料的水灰比为1：1；注浆封孔时，每个高位钻孔的总注浆量为5～10m 3。
本发明相比现有技术的优点在于：本发明高位钻孔的布置通过采取“压茬布置”结合“巷道顶板布孔”的方式，且高位钻孔终孔位于采空区上方裂隙带不同层位，能够实现对采空区瓦斯全方位探测抽采，保证高位钻孔能够连续抽采瓦斯富集区域高浓度瓦斯，实现工作面瓦斯精准治理；具体优点如下：
(1)本发明中，当布置于回风巷道帮上的第一组巷道高位钻孔受到工作面回采影响，帮上钻孔及抽采管道受损无法实现继续接抽时，相距20m的第二组巷道高位钻孔终孔位于裂隙带瓦斯富集区域，通过所述第二组巷道高位钻孔实现接续抽采，保证抽采管路瓦斯浓度一直处于高浓度水平；当第二组巷道高位钻孔受损后，第三组接续抽采，以此类推，所有瓦斯抽采钻孔管道接入瓦斯抽采总管实现抽采；
(2)本发明中，回风巷道帮上的每组巷道高位钻孔的终孔位于采空区上方裂隙带不同层位，能够实现对采空区瓦斯全方位探测抽采，保证高位钻孔能够连续抽采瓦斯富集区域高浓度瓦斯；
(3)本发明中，每组巷道高位钻孔的上方巷道顶板处还布置有一个顶板高位钻孔；在工作面推进过钻场后，位于回风巷道帮上的巷道高位钻孔失效后， 巷道顶板的顶板高位钻孔仍能继续抽采采空区裂隙带瓦斯，实现连续抽采。
附图说明
图1是实施例1中各高位钻孔的立面布置示意图；
图2是图1中第一组高位钻孔的立面结构示意图；
图3是实施例1中回风巷道帮上同组的巷道高位钻孔开孔点间位置关系图。
图中：1为工作面，2为巷道高位钻孔群，21为巷道高位钻孔，211为1#钻孔，212为2#钻孔，213为3#钻孔，3为顶板高位钻孔，31为4#钻孔，4为回风巷道帮，41为钻场，411为第一个钻场，412为第二个钻场，413为第三个钻场，414为第四个钻场，5为巷道顶板，6为采空区裂隙带区域。
具体实施方式
下面对本发明的实施例作详细说明，本实施例在以本发明技术方案为前提下进行实施，给出了详细的实施方式和具体的操作过程，但本发明的保护范围不限于下述的实施例。
实施例1
本实施例的一种实现工作面回采过程高位钻孔连续抽采瓦斯的方法，包括如下步骤：
(1)如图1所示，在回风巷道帮4上每间隔20m开设一钻场41，共设四个钻场41，每个钻场41施工一组巷道高位钻孔群2。其中，如图3所示，每组巷道高位钻孔群2包括三个巷道高位钻孔21，三个巷道高位钻孔21的开孔点成排布置，并且，相邻的两个开孔点位置间距为1.0m。具体地，同组的三个巷道高位钻孔21的开孔点位于回风巷道帮4上、距离巷道顶板5位置0.5m高度处，终孔点位于煤层上方采空区裂隙带区域6、且分别距离煤层20m、30m、40m高度处。
(2)如图1、图2所示，在每个钻场41上方的巷道顶板5处分别施工一 个顶板高位钻孔3。其中，顶板高位钻孔3的开孔点位于相应的巷道顶板5上、且距离回风巷道帮4位置1.0m处，终孔点位于煤层上方采空区裂隙带区域6、且距离煤层40m高度处。
(3)在施工完成的巷道高位钻孔21与顶板高位钻孔3内分别安装套管、瓦斯抽放管，用以抽采瓦斯；同时，将四个钻孔孔口连接瓦斯浓度在线监测装置，用于监测显示每个钻孔瓦斯浓度。
(4)开始进行工作面1回采工作，连续抽采瓦斯。参见图1，回采过程中，工作面1随着回采工作向前推进；当经过一个钻场41时，该钻场41的三个巷道高位钻孔21失效；此时，连接下一个钻场41的三个巷道高位钻孔21以接上抽采，直至采煤的工作面1全部回采结束。
进一步地，在本实施例中，在回风巷道帮4上每间隔20m布置一组巷道高位钻孔群2的开孔点，在相应的巷道顶板5处每间隔20m布置一个顶板高位钻孔3的开孔点。
进一步地，在本实施例中，巷道高位钻孔21与顶板高位钻孔3的钻孔孔径为94mm，瓦斯抽放管的直径为72mm。
进一步地，在本实施例中，当巷道高位钻孔21和顶板高位钻孔3全部施工完成，具体采取水泥砂浆材料进行封孔。封孔后，下放套管与瓦斯抽放管路，并连接总抽放管路进行瓦斯抽采。同时，水泥砂浆材料的水灰比为1：1；注浆封孔时，每个高位钻孔的总注浆量为5～10m 3。
进一步地，在本实施例中，关于相邻钻场41中巷道高位钻孔21与相邻顶板高位钻孔3的布置方式，采用“压茬”布置形式，即：
施工时，先在第一个钻场411中施工第一组的三个巷道高位钻孔21，分别命名为1#钻孔211、2#钻孔212、3#钻孔213；其中，1#钻孔211、2#钻孔212、3#钻孔213的开孔点位于回风巷道帮4上、距离巷道顶板5位置0.5m高度处，1#钻孔211终孔点位于煤层上方采空区裂隙带区域6、距离煤层20m垂直高度处，2#钻孔212终孔点位于煤层上方采空区裂隙带区域6、距离煤层30m垂直 高度处，3#钻孔213终孔点位于煤层上方采空区裂隙带区域6、距离煤层40m垂直高度处。接着，在1#钻孔211、2#钻孔212、3#钻孔213上方的巷道顶板5处施工第一个顶板高位钻孔3，命名为4#钻孔31；4#钻孔31的开孔点位于巷道顶板5上、且距离回风巷道帮4位置1.0m处，终孔点位于煤层上方采空区裂隙带区域6、且距离煤层40m垂直高度处，如图2。
待第一组的巷道高位钻孔21与第一个顶板高位钻孔3施工完成，再按照上述方式在第二个钻场412、第三个钻场413、第四个钻场414上依次实施第二、第三、第四组巷道高位钻孔21，在相应的巷道顶板5处实施第二、第三、第四个顶板高位钻孔3，如图1所示。各组钻孔之间采用压茬布置方式依次进行。
另外，需要注意的是，关于工作面1、回风巷道帮4、巷道顶板5、采空区裂隙带区域6的结构位置关系，即，“煤层的工作面1位于回风巷道帮4之内，巷道顶板5赋存在回风巷道帮4之上的邻近岩层，采空区裂隙带区域6为巷道顶板5上的一个区域带”，均为本领域公知常识，在此便不再赘述。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种实现工作面回采过程高位钻孔连续抽采瓦斯的方法，其特征在于，包括如下步骤：
    (1)在回风巷道帮上开设若干钻场，每个钻场施工一组巷道高位钻孔群；其中，每组巷道高位钻孔群包括三个巷道高位钻孔，所述三个巷道高位钻孔的开孔点位于所述回风巷道帮上的相应钻场处，终孔点位于煤层上方采空区裂隙带区域的不同高度位置；
    (2)在每个钻场上方的巷道顶板处分别施工一个顶板高位钻孔；其中，顶板高位钻孔的开孔点位于相应的巷道顶板上，终孔点位于煤层上方采空区裂隙带区域；
    (3)在施工完成的巷道高位钻孔与顶板高位钻孔内分别安装套管、瓦斯抽放管，用以抽采瓦斯；同时，将四个钻孔孔口连接瓦斯浓度在线监测装置，用于监测显示每个钻孔瓦斯浓度；
    (4)开始进行工作面回采工作，连续抽采瓦斯。
  2. 根据权利要求1所述的实现工作面回采过程高位钻孔连续抽采瓦斯的方法，其特征在于，所述步骤(1)中，在回风巷道帮上每间隔20m开设一钻场，钻场的具体数量根据回采工作面长度确定；并且，相邻钻场中钻孔的布置采用“压茬”布置。
  3. 根据权利要求1所述的实现工作面回采过程高位钻孔连续抽采瓦斯的方法，其特征在于，所述步骤(1)和步骤(2)中，在回风巷道帮上每间隔20m布置一组所述巷道高位钻孔群的开孔点，在相应的巷道顶板处每间隔20m布置一个顶板高位钻孔的开孔点。
  4. 根据权利要求1所述的实现工作面回采过程高位钻孔连续抽采瓦斯的方法，其特征在于，所述步骤(1)中，同组的三个所述巷道高位钻孔开孔点成排布置，并且，相邻的两个开孔点位置间距为1.0m。
  5. 根据权利要求1所述的实现工作面回采过程高位钻孔连续抽采瓦斯的方 法，其特征在于，所述步骤(1)中，同组的三个巷道高位钻孔的开孔点具体位于回风巷道帮上、距离巷道顶板0.5m高度的位置处，终孔点具体位于煤层上方采空区裂隙带区域、且分别距离煤层20m、30m、40m高度的位置处。
  6. 根据权利要求1所述的实现工作面回采过程高位钻孔连续抽采瓦斯的方法，其特征在于，所述步骤(2)中，每个顶板高位钻孔的开孔点位于相应的巷道顶板上、且距离回风巷道帮1.0m位置处，终孔点位于煤层上方采空区裂隙带区域、且距离煤层40m高度的位置处。
  7. 根据权利要求1所述的实现工作面回采过程高位钻孔连续抽采瓦斯的方法，其特征在于，所述步骤(4)中，回采过程中，工作面随着回采工作向前推进；当经过一个钻场时，该钻场的三个巷道高位钻孔失效；此时，连接下一个钻场的三个巷道高位钻孔以接上抽采，直至采煤工作面全部回采结束。
  8. 根据权利要求1～7任一所述的实现工作面回采过程高位钻孔连续抽采瓦斯的方法，其特征在于，所述巷道高位钻孔与顶板高位钻孔的钻孔孔径为94mm，瓦斯抽放管的直径为72mm。
  9. 根据权利要求1～7任一所述的实现工作面回采过程高位钻孔连续抽采瓦斯的方法，其特征在于，当所述巷道高位钻孔和顶板高位钻孔全部施工完成，具体采取水泥砂浆材料进行封孔；封孔后，下放套管与瓦斯抽放管路，并连接总抽放管路进行瓦斯抽采。
  10. 根据权利要求9所述的实现工作面回采过程高位钻孔连续抽采瓦斯的方法，其特征在于，所述水泥砂浆材料的水灰比为1：1；注浆封孔时，每个高位钻孔的总注浆量为5～10m 3。
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