WO2020151207A1 - Coordinative extraction and pressure relief method for high confined water high gas coal seam group - Google Patents

Coordinative extraction and pressure relief method for high confined water high gas coal seam group Download PDF

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WO2020151207A1
WO2020151207A1 PCT/CN2019/096402 CN2019096402W WO2020151207A1 WO 2020151207 A1 WO2020151207 A1 WO 2020151207A1 CN 2019096402 W CN2019096402 W CN 2019096402W WO 2020151207 A1 WO2020151207 A1 WO 2020151207A1
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drainage
coal seam
gas
coal
valve
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PCT/CN2019/096402
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French (fr)
Chinese (zh)
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王磊
袁秋鹏
焦振华
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安徽理工大学
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    • 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures

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  • the invention relates to the technical field of coal mining, in particular to a coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams.
  • the coal strata in the eastern mining areas of China are mostly coal seams.
  • the coal seam gas pressure is high and often accompanied by aquifers. It is extremely difficult to mine. In order to prevent gas and water hazards and safe mining, it is necessary to drill the coal seam before mining On the other hand, it is necessary to implement drilling holes to drain water into the aquifer.
  • the current drainage pressure relief and drainage drainage measures have complicated construction procedures, high costs, and low drainage and drainage efficiency.
  • the invention provides a coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams, which can simplify construction procedures, reduce costs, and improve the efficiency of drainage and drainage.
  • the invention provides a coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams, which includes:
  • a drainage main pipe is arranged in the vertical borehole, and a gas drainage branch pipe connected to the drainage main pipe is arranged in each of the coal seam boreholes, and the gas drainage branch pipe is connected to the gas drainage main pipe and the gas drainage branch pipe.
  • High-pressure water is injected into the coal seam boreholes, each coal seam is fractured, and the high-pressure water is pumped away after each coal seam is fractured;
  • a drainage borehole connected to the aquifer is opened from the vertical borehole;
  • a drainage branch pipe connected to the drainage main is arranged in the drainage borehole, the The main drainage pipe is provided with a main valve, the gas drainage branch pipe is provided with a gas drainage valve, and the drainage branch pipe is provided with a drain valve;
  • the gas drainage valve When the gas concentration in the coal seam drops to a safe range, the gas drainage valve is closed, and the drain valve is opened to drain the stored water in the aquifer.
  • coal seams are drilled radially distributed in each coal seam.
  • the method further includes: selecting an appropriate proppant and amount of added sand according to the characteristic attributes of each coal seam.
  • the drainage borehole is a borehole that is inclined at a certain angle from the vertical borehole toward the aquifer.
  • main valve, the gas drainage valve and the drain valve are all electronic valves that are uniformly controlled by an external control unit.
  • a vertical borehole is opened, and a coal seam borehole connected to each coal seam is opened in the vertical borehole, and high pressure water is injected into the vertical borehole and the coal seam borehole to realize coal seam fracturing.
  • Drain high-pressure water set drainage boreholes to connect vertical boreholes and aquifers, arrange drainage main pipes in vertical boreholes, arrange gas drainage branch pipes in coal seam boreholes, arrange drainage branch pipes in drainage boreholes, and install Corresponding valves are set up to extract the stored water from the gas and aquifer in sequence, so as to realize the "one hole, one pipe for multiple purposes" extraction of coal seam gas and high-pressure water, with simple construction procedures, low cost, and drainage and drainage The advantage of high efficiency.
  • Figure 1 is a schematic flow chart of a method for coordinated drainage and pressure relief of a high-pressure water and high-gas coal seam group according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic diagram of the realization of a coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams according to Embodiment 1 of the present invention
  • Fig. 3 is a schematic diagram of the coordinated structure of gas drainage branch pipes in each coal seam of a coordinated drainage and pressure relief method for a high-pressure water and high-gas coal seam group according to the first embodiment of the present invention.
  • FIG. 1 it is a schematic flow chart of a method for coordinated drainage and pressure relief of a high-pressure water and high-gas coal seam group provided by the first embodiment of the present invention, which includes the following steps S101 to S106:
  • Step S101 Detect the distribution of coal seams and the occurrence of various coal seams and aquifers.
  • Step S102 Implement vertical drilling from the ground to penetrate each coal seam to the bottom coal seam, and open a corresponding coal seam borehole on the wall of the vertical borehole that penetrates each coal seam.
  • Step S103 Arrange the drainage main pipe in the vertical boreholes, arrange the gas drainage branch pipes connected to the drainage main pipe in each coal seam borehole, and inject high-pressure water into the coal seam boreholes through the drainage main pipe and the gas drainage branch pipes.
  • Each coal seam undergoes fracturing treatment, and the high-pressure water is pumped away after each coal seam is fractured.
  • Step S104 After the high-pressure water is pumped away, a drainage borehole connected to the aquifer is opened from the vertical borehole, and a drainage branch pipe connected to the drainage main pipe is arranged in the drainage borehole, and the drainage main pipe is provided with a main valve.
  • the gas drainage branch pipe is equipped with a gas drainage valve
  • the drainage branch pipe is equipped with a drainage valve.
  • Step S105 Set up the extraction equipment connected to the drainage main pipe outside the vertical borehole, start the extraction equipment, open the main valve and the gas extraction valve, and perform gas extraction on each coal seam.
  • Step S106 When the gas concentration in the coal seam drops to a safe range, close the gas drainage valve and open the drain valve to drain the stored water in the aquifer.
  • coal seam boreholes 7 are radially distributed in each coal seam.
  • coal seam boreholes 7 are set radially in each coal seam to ensure uniform fracturing of each coal seam and thorough coal seam gas drainage.
  • the drainage borehole 8 is a borehole that is inclined at a certain angle from the vertical borehole 6 toward the aquifer 4.
  • the use of inclined boreholes can produce a certain buffer effect on the storage water in the aquifer 4 to ensure the safety of drilling construction.
  • main valve 12, the gas drainage valve 13, and the drain valve 14 are all electronic valves that are uniformly controlled by an external control unit.
  • the main valve 12, the gas extraction valve 13, and the drain valve 14 are all electronic valves, which are uniformly controlled by an external control unit to open and close, so as to control each pipeline in a timely and consistent manner and improve the efficiency of the drainage work.

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Abstract

A coordinative extraction and pressure relief method for a high confined water high gas coal seam group. The method comprises: by forming a vertical drill hole (6) and forming, in the vertical drill hole (6), coal seam drill holes (7) communicated with coal seams, implementing fracturing of the coal seams by injecting high-pressure water into the vertical drill hole (6) and the coal seam drill holes (7); after the coal seams are fractured, pumping and draining the high-pressure water, and then providing a drainage drill hole (8) communicating the vertical drill hole (6) and an aquifer (4); arranging a pumping and draining main pipe (9) in the vertical drill hole (6), arranging gas extraction branch pipes (10) in the coal seam drill holes (7), and arranging a drainage branch pipe (11) in the drainage drill hole (8) and mounting a corresponding valve; and sequentially pumping gas and storage water of the aquifer away. Therefore, extraction of the gas and high confined water in the coal seams is implemented by "one hole and one pipe for multiple purposes". The method has the advantages of simple construction process, low costs, and high extraction and drainage efficiency.

Description

一种高承压水高瓦斯煤层群协调抽采卸压方法Coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams 技术领域Technical field
本发明涉及煤矿开采技术领域，尤其涉及一种高承压水高瓦斯煤层群协调抽采卸压方法。The invention relates to the technical field of coal mining, in particular to a coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams.
背景技术Background technique
我国东部矿区煤系地层多为煤层群条件，煤层瓦斯压力高且常伴有含水层，开采难度极大，为防止瓦斯、水害等事故，安全开采，在煤层开采前一方面需要先煤层实施钻孔，排放瓦斯；另一方面还要向含水层实施钻孔放水，目前的抽采卸压及排水疏放措施施工程序复杂，成本较高，且抽采、疏放效率低下。The coal strata in the eastern mining areas of China are mostly coal seams. The coal seam gas pressure is high and often accompanied by aquifers. It is extremely difficult to mine. In order to prevent gas and water hazards and safe mining, it is necessary to drill the coal seam before mining On the other hand, it is necessary to implement drilling holes to drain water into the aquifer. The current drainage pressure relief and drainage drainage measures have complicated construction procedures, high costs, and low drainage and drainage efficiency.
发明内容Summary of the invention
本发明提供了一种高承压水高瓦斯煤层群协调抽采卸压方法，可使施工程序简单，降低成本，且提高抽采和疏放的效率。The invention provides a coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams, which can simplify construction procedures, reduce costs, and improve the efficiency of drainage and drainage.
本发明提供了一种高承压水高瓦斯煤层群协调抽采卸压方法，其包括：The invention provides a coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams, which includes:
探测煤层的分布情况以及各个煤层与含水层的赋存情况；Detect the distribution of coal seams and the occurrence of various coal seams and aquifers;
从地面实施垂直钻孔贯穿各个煤层直至最底层煤层内，并在贯穿每个煤层位置的所述垂直钻孔的孔壁上朝每个煤层内开设对应的煤层钻孔；Implement vertical boreholes from the ground to penetrate each coal seam to the bottom coal seam, and open a corresponding coal seam borehole on the wall of the vertical borehole that penetrates each coal seam;
在所述垂直钻孔内布置抽放总管，在各个所述煤层钻孔内布置与所述抽放总管相连的瓦斯抽采支管，通过所述抽放总管及所述瓦斯抽采支管向所述煤层钻孔内注入高压水，对各个煤层进行压裂处理，待各个煤层被压裂后将所述高压水抽离；A drainage main pipe is arranged in the vertical borehole, and a gas drainage branch pipe connected to the drainage main pipe is arranged in each of the coal seam boreholes, and the gas drainage branch pipe is connected to the gas drainage main pipe and the gas drainage branch pipe. High-pressure water is injected into the coal seam boreholes, each coal seam is fractured, and the high-pressure water is pumped away after each coal seam is fractured;
待所述高压水被抽离后，自所述垂直钻孔内开设连通至所述含水层的排水钻孔；在所述排水钻孔内布置与所述抽放总管相连的疏水支管，所述抽放总管上设有总阀门，所述瓦斯抽采支管上设有瓦斯抽采阀门，所述疏水支管上设有疏水阀门；After the high-pressure water is pumped away, a drainage borehole connected to the aquifer is opened from the vertical borehole; a drainage branch pipe connected to the drainage main is arranged in the drainage borehole, the The main drainage pipe is provided with a main valve, the gas drainage branch pipe is provided with a gas drainage valve, and the drainage branch pipe is provided with a drain valve;
在所述垂直钻孔外设置与所述抽放总管相连的抽采设备，并启动所述抽采设备、打开所述总阀门及所述瓦斯抽采阀门，对各个煤层进行瓦斯抽离；Set up the extraction equipment connected with the drainage main pipe outside the vertical borehole, start the extraction equipment, open the main valve and the gas extraction valve, and perform gas extraction on each coal seam;
待煤层内瓦斯浓度降至至安全范围时，关闭所述瓦斯抽采阀门，打开所述疏水阀门抽放含水层内的存储水。When the gas concentration in the coal seam drops to a safe range, the gas drainage valve is closed, and the drain valve is opened to drain the stored water in the aquifer.
。.
进一步地，所述煤层钻孔成放射状分布于每个煤层内。Further, the coal seams are drilled radially distributed in each coal seam.
进一步地，在执行所述对各个煤层进行压裂处理的步骤的同时所述方法还包括：根据各个煤层的特征属性选择合适的支撑剂和加沙量。Further, while performing the step of performing fracturing treatment on each coal seam, the method further includes: selecting an appropriate proppant and amount of added sand according to the characteristic attributes of each coal seam.
进一步地，所述排水钻孔为自所述垂直钻孔朝所述含水层内成一定角度倾斜开设的孔体。Further, the drainage borehole is a borehole that is inclined at a certain angle from the vertical borehole toward the aquifer.
进一步地，所述总阀门、所述瓦斯抽采阀门以及所述疏水阀门均为由外部控制单元统一控制的电子阀门。Further, the main valve, the gas drainage valve and the drain valve are all electronic valves that are uniformly controlled by an external control unit.
本发明实施例通过开设一个垂直钻孔，并在垂直钻孔内开设连通至各个煤层的煤层钻孔，向垂直钻孔和煤层钻孔内注入高压水实现煤层的压裂，待煤层压裂后，抽放高压水，再设置疏水钻孔连通垂直钻孔与含水层，在垂直钻孔内布置抽放总管、煤层钻孔内布置瓦斯抽采支管、在疏水钻孔内布置疏水支管，并安设相应的阀门，按顺序抽离瓦斯和含水层的存储水，从而实现“一孔一管多用”抽采煤层瓦斯及高承压水，具有施工程序简单，成本低，且抽采、疏放效率高的优点。In the embodiment of the present invention, a vertical borehole is opened, and a coal seam borehole connected to each coal seam is opened in the vertical borehole, and high pressure water is injected into the vertical borehole and the coal seam borehole to realize coal seam fracturing. After the coal seam is cracked , Drain high-pressure water, set drainage boreholes to connect vertical boreholes and aquifers, arrange drainage main pipes in vertical boreholes, arrange gas drainage branch pipes in coal seam boreholes, arrange drainage branch pipes in drainage boreholes, and install Corresponding valves are set up to extract the stored water from the gas and aquifer in sequence, so as to realize the "one hole, one pipe for multiple purposes" extraction of coal seam gas and high-pressure water, with simple construction procedures, low cost, and drainage and drainage The advantage of high efficiency.
附图说明Description of the drawings
为了更清楚地说明本发明实施例技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to explain the technical solutions of the embodiments of the present invention more clearly, the following will briefly introduce the drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. Ordinary technical personnel can obtain other drawings based on these drawings without creative work.
图1为本发明实施例一提供的一种高承压水高瓦斯煤层群协调抽采卸压方法的示意流程图；Figure 1 is a schematic flow chart of a method for coordinated drainage and pressure relief of a high-pressure water and high-gas coal seam group according to Embodiment 1 of the present invention;
图2为本发明实施例一提供的一种高承压水高瓦斯煤层群协调抽采卸压方法的实现结构示意图；2 is a schematic diagram of the realization of a coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams according to Embodiment 1 of the present invention;
图3为本发明实施例一提供的一种高承压水高瓦斯煤层群协调抽采卸压方法的每个煤层内的瓦斯抽采支管配合结构示意图。Fig. 3 is a schematic diagram of the coordinated structure of gas drainage branch pipes in each coal seam of a coordinated drainage and pressure relief method for a high-pressure water and high-gas coal seam group according to the first embodiment of the present invention.
具体实施方式detailed description
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
应当理解，当在本说明书和所附权利要求书中使用时，术语“包括”和“包含”指示所描述特征、整体、步骤、操作、元素和/或组件的存在，但并不排除一个或多个其它特征、整体、步骤、操作、元素、组件和/或其集合的存在或添加。It should be understood that when used in this specification and the appended claims, the terms "including" and "including" indicate the existence of the described features, wholes, steps, operations, elements and/or components, but do not exclude one or The existence or addition of multiple other features, wholes, steps, operations, elements, components, and/or collections thereof.
还应当理解，在此本发明说明书中所使用的术语仅仅是出于描述特定实施例的目的而并不意在限制本发明。如在本发明说明书和所附权利要求书中所使用的那样，除非上下文清楚地指明其它情况，否则单数形式的“一”、“一个”及“该”意在包括复数形式。It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.
参见图1，是本发明实施例一提供的一种高承压水高瓦斯煤层群协调抽采卸压方法的示意流程图，其包括以下步骤S101～S106：Referring to Fig. 1, it is a schematic flow chart of a method for coordinated drainage and pressure relief of a high-pressure water and high-gas coal seam group provided by the first embodiment of the present invention, which includes the following steps S101 to S106:
步骤S101：探测煤层的分布情况以及各个煤层与含水层的赋存情况。Step S101: Detect the distribution of coal seams and the occurrence of various coal seams and aquifers.
步骤S102：从地面实施垂直钻孔贯穿各个煤层直至最底层煤层内，并在贯穿每个煤层位置的垂直钻孔的孔壁上朝每个煤层内开设对应的煤层钻孔。Step S102: Implement vertical drilling from the ground to penetrate each coal seam to the bottom coal seam, and open a corresponding coal seam borehole on the wall of the vertical borehole that penetrates each coal seam.
步骤S103：在垂直钻孔内布置抽放总管，在各个煤层钻孔内布置与抽放总管相连的瓦斯抽采支管，通过抽放总管及瓦斯抽采支管向煤层钻孔内注入高压水，对各个煤层进行压裂处理，待各个煤层被压裂后将高压水抽离。Step S103: Arrange the drainage main pipe in the vertical boreholes, arrange the gas drainage branch pipes connected to the drainage main pipe in each coal seam borehole, and inject high-pressure water into the coal seam boreholes through the drainage main pipe and the gas drainage branch pipes. Each coal seam undergoes fracturing treatment, and the high-pressure water is pumped away after each coal seam is fractured.
步骤S104：待高压水被抽离后，自垂直钻孔内开设连通至含水层的排水钻孔，在排水钻孔内布置与抽放总管相连的疏水支管，抽放总管上设有总阀门，瓦斯抽采支管上设有瓦斯抽采阀门，疏水支管上设有疏水阀门。Step S104: After the high-pressure water is pumped away, a drainage borehole connected to the aquifer is opened from the vertical borehole, and a drainage branch pipe connected to the drainage main pipe is arranged in the drainage borehole, and the drainage main pipe is provided with a main valve. The gas drainage branch pipe is equipped with a gas drainage valve, and the drainage branch pipe is equipped with a drainage valve.
步骤S105：在垂直钻孔外设置与抽放总管相连的抽采设备，并启动抽采设备、打开总阀门及瓦斯抽采阀门，对各个煤层进行瓦斯抽离。Step S105: Set up the extraction equipment connected to the drainage main pipe outside the vertical borehole, start the extraction equipment, open the main valve and the gas extraction valve, and perform gas extraction on each coal seam.
步骤S106：待煤层内瓦斯浓度降至至安全范围时，关闭瓦斯抽采阀门，打开所述疏水阀门抽放含水层内的存储水。Step S106: When the gas concentration in the coal seam drops to a safe range, close the gas drainage valve and open the drain valve to drain the stored water in the aquifer.
具体地，参见图2，以三层煤层为例(如图中的煤层1、煤层2和煤层3)， 探测煤层1、煤层2、煤层3及含水层4的赋存情况；从地面5实施垂直钻孔6，穿过煤层1、煤层2到达煤层3；在煤层1、煤层2和煤层3煤层内实施煤层钻孔7；向垂直钻孔6及煤层钻孔7注入高压水，利用高压水压裂煤层1、煤层2到达煤层3，产生煤层裂缝16，提高煤层的透气性；抽放垂直钻孔6及煤层钻孔7内的高压水；从垂直钻孔6打排水钻孔8，到达含水层4；在垂直钻孔6内布置抽放总管路9；在煤层钻孔7内布置瓦斯抽采支管路10；在排水钻孔8内布置疏水支管道11；安装总阀门12，瓦斯抽采阀门13，疏水阀门14；在垂直钻孔6附近布置抽采设备15；启动抽采设备15，打开总阀门12，瓦斯抽采阀门13，抽放煤层1、煤层2和煤层3煤层瓦斯；关闭瓦斯抽采阀门13，打开疏水阀门14，抽放含水层4的高压水。在具体实现中，可例如将垂直钻孔6的开设直径设置为不小于150mm，使其满足一孔一管的抽采需求，提高抽采效率。Specifically, referring to Figure 2, taking three coal seams as an example (the coal seam 1, coal seam 2, and coal seam 3 in the figure), detect the occurrence of coal seam 1, coal seam 2, coal seam 3 and aquifer 4; implement from ground 5 Vertical drilling 6, passing through coal seam 1, coal seam 2 to coal seam 3; implementing coal seam drilling 7 in coal seams 1, coal seam 2 and coal seam 3; injecting high pressure water into vertical drilling 6 and coal seam drilling 7, using high pressure water Fracturing coal seam 1 and coal seam 2 reaches coal seam 3, generating coal seam cracks 16 to improve the permeability of the coal seam; draining the high-pressure water in vertical drilling 6 and coal seam drilling 7; draining water from vertical drilling 6 to reach Aquifer 4; the main drainage pipeline 9 is arranged in the vertical borehole 6; the gas drainage branch pipeline 10 is arranged in the coal seam borehole 7; the drainage branch pipeline 11 is arranged in the drainage borehole 8; the main valve 12 is installed for gas drainage Extraction valve 13, drainage valve 14; arrange extraction equipment 15 near the vertical borehole 6; start extraction equipment 15, open main valve 12, gas extraction valve 13, and drain coal seam 1, coal seam 2 and coal seam 3; Close the gas drainage valve 13 and open the drain valve 14 to drain the high-pressure water in the aquifer 4. In a specific implementation, for example, the opening diameter of the vertical borehole 6 can be set to not less than 150 mm, so that it can meet the requirement of one hole one pipe for extraction and improve the extraction efficiency.
具体地，通过开设一个垂直钻孔，并在垂直钻孔内开设连通至各个煤层的煤层钻孔，向垂直钻孔和煤层钻孔内注入高压水实现煤层的压裂，待煤层压裂后，抽放高压水，再设置疏水钻孔连通垂直钻孔与含水层，在垂直钻孔内布置抽放总管、煤层钻孔内布置瓦斯抽采支管、在疏水钻孔内布置疏水支管，并安设相应的阀门，按顺序抽离瓦斯和含水层的存储水，从而实现“一孔一管多用”抽采煤层瓦斯及高承压水，具有施工程序简单，成本低，且抽采、疏放效率高的优点。Specifically, by opening a vertical borehole and opening coal seam boreholes connected to each coal seam in the vertical borehole, high pressure water is injected into the vertical borehole and the coal seam borehole to achieve coal seam fracturing. After the coal seam is cracked, Drain high-pressure water, then set drainage boreholes to connect the vertical boreholes with the aquifer, arrange drainage main pipes in vertical boreholes, arrange gas drainage branch pipes in coal seam boreholes, arrange drainage branch pipes in drainage boreholes, and install them Corresponding valves pump out the stored water of gas and aquifers in sequence, so as to realize the extraction of coal seam gas and high-pressure water with "one hole, one pipe for multiple purposes", with simple construction procedures, low cost, and drainage and drainage The advantage of high efficiency.
参见图3，进一步地，煤层钻孔7成放射状分布于每个煤层内。Referring to Figure 3, further, coal seam boreholes 7 are radially distributed in each coal seam.
具体地，在每个煤层内成放射状的开设煤层钻孔7，确保每个煤层的压裂均匀及煤层瓦斯抽放彻底。Specifically, coal seam boreholes 7 are set radially in each coal seam to ensure uniform fracturing of each coal seam and thorough coal seam gas drainage.
参见图2，进一步地，排水钻孔8为自垂直钻孔6朝含水层4内成一定角度倾斜开设的孔体。Referring to FIG. 2, further, the drainage borehole 8 is a borehole that is inclined at a certain angle from the vertical borehole 6 toward the aquifer 4.
具体地，因含水层4内的存储水具有一定的压力，通过采用倾斜钻孔可对含水层4内的存储水产生一定的缓冲作用，确保钻孔施工的安全性。Specifically, because the storage water in the aquifer 4 has a certain pressure, the use of inclined boreholes can produce a certain buffer effect on the storage water in the aquifer 4 to ensure the safety of drilling construction.
进一步地，总阀门12、瓦斯抽采阀门13以及疏水阀门14均为由外部控制单元统一控制的电子阀门。Further, the main valve 12, the gas drainage valve 13, and the drain valve 14 are all electronic valves that are uniformly controlled by an external control unit.
具体地，总阀门12、瓦斯抽采阀门13以及疏水阀门14均为电子阀门，由外部控制单元统一控制开闭，以便及时连贯的对各个管道进行控制，提高抽放工作效率。Specifically, the main valve 12, the gas extraction valve 13, and the drain valve 14 are all electronic valves, which are uniformly controlled by an external control unit to open and close, so as to control each pipeline in a timely and consistent manner and improve the efficiency of the drainage work.
在本申请所提供的实施例中，应该理解到，所揭露的内容，仅仅是示意性的，可以通过其它的方式实现。In the embodiments provided in this application, it should be understood that the disclosed content is only illustrative and can be implemented in other ways.
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到各种等效的修改或替换，这些修改或替换都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以权利要求的保护范围为准。The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed in the present invention. Modifications or replacements, these modifications or replacements should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (4)

  1. 一种高承压水高瓦斯煤层群协调抽采卸压方法，其特征在于，包括：A coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams is characterized in that it comprises:
    探测煤层的分布情况以及各个煤层与含水层的赋存情况；Detect the distribution of coal seams and the occurrence of various coal seams and aquifers;
    从地面实施垂直钻孔贯穿各个煤层直至最底层煤层内，并在贯穿每个煤层位置的所述垂直钻孔的孔壁上朝每个煤层内开设对应的煤层钻孔；Implement vertical boreholes from the ground to penetrate each coal seam to the bottom coal seam, and open a corresponding coal seam borehole on the wall of the vertical borehole that penetrates each coal seam;
    在所述垂直钻孔内布置抽放总管，在各个所述煤层钻孔内布置与所述抽放总管相连的瓦斯抽采支管，通过所述抽放总管及所述瓦斯抽采支管向所述煤层钻孔内注入高压水，对各个煤层进行压裂处理，待各个煤层被压裂后将所述高压水抽离；A drainage main pipe is arranged in the vertical borehole, and a gas drainage branch pipe connected to the drainage main pipe is arranged in each of the coal seam boreholes, and the gas drainage branch pipe is connected to the gas drainage main pipe and the gas drainage branch pipe. High-pressure water is injected into the coal seam boreholes, each coal seam is fractured, and the high-pressure water is pumped away after each coal seam is fractured;
    待所述高压水被抽离后，自所述垂直钻孔内开设连通至所述含水层的排水钻孔，在所述排水钻孔内布置与所述抽放总管相连的疏水支管，所述抽放总管上设有总阀门，所述瓦斯抽采支管上设有瓦斯抽采阀门，所述疏水支管上设有疏水阀门；After the high-pressure water is pumped away, a drainage borehole connected to the aquifer is opened from the vertical borehole, and a drainage branch pipe connected to the drainage main is arranged in the drainage borehole. The main drainage pipe is provided with a main valve, the gas drainage branch pipe is provided with a gas drainage valve, and the drainage branch pipe is provided with a drain valve;
    在所述垂直钻孔外设置与所述抽放总管相连的抽采设备，并启动所述抽采设备、打开所述总阀门及所述瓦斯抽采阀门，对各个煤层进行瓦斯抽离；Set up the extraction equipment connected with the drainage main pipe outside the vertical borehole, start the extraction equipment, open the main valve and the gas extraction valve, and perform gas extraction on each coal seam;
    待煤层内瓦斯浓度降至至安全范围时，关闭所述瓦斯抽采阀门，打开所述疏水阀门抽放含水层内的存储水。When the gas concentration in the coal seam drops to a safe range, the gas drainage valve is closed, and the drain valve is opened to drain the stored water in the aquifer.
  2. 根据权利要求1所述的高承压水高瓦斯煤层群协调抽采卸压方法，其特征在于，所述煤层钻孔成放射状分布于每个煤层内。The coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams according to claim 1, wherein the coal seam boreholes are radially distributed in each coal seam.
  3. 根据权利要求1所述的高承压水高瓦斯煤层群协调抽采卸压方法，其特征在于，所述排水钻孔为自所述垂直钻孔朝所述含水层内成一定角度倾斜开设的孔体。The method for coordinated drainage and pressure relief of high-pressure-water and high-gas coal seams according to claim 1, wherein the drainage borehole is inclined from the vertical borehole toward the aquifer at a certain angle. Hole body.
  4. 根据权利要求1所述的高承压水高瓦斯煤层群协调抽采卸压方法，其特征在于，所述总阀门、所述瓦斯抽采阀门以及所述疏水阀门均为由外部控制单元统一控制的电子阀门。The coordinated drainage and pressure relief method for high-pressure water and high-gas coal seams according to claim 1, wherein the main valve, the gas drainage valve, and the drain valve are all controlled by an external control unit. Electronic valve.
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