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WO2020113870A1 - Method for cooperatively draining roof separation water and mining coal-measure gas - Google Patents

Method for cooperatively draining roof separation water and mining coal-measure gas Download PDF

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Publication number
WO2020113870A1
WO2020113870A1 PCT/CN2019/080733 CN2019080733W WO2020113870A1 WO 2020113870 A1 WO2020113870 A1 WO 2020113870A1 CN 2019080733 W CN2019080733 W CN 2019080733W WO 2020113870 A1 WO2020113870 A1 WO 2020113870A1
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Prior art keywords
horizontal
coal
well
section
horizontal well
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PCT/CN2019/080733
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French (fr)
Chinese (zh)
Inventor
吴财芳
房孝杰
刘宁宁
刘小磊
张和伟
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China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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Application filed by China University of Mining and Technology CUMT, China University of Mining and Technology Beijing CUMTB filed Critical China University of Mining and Technology CUMT
Priority to KR1020207003125A priority Critical patent/KR102369397B1/en
Priority to AU2019323218A priority patent/AU2019323218A1/en
Priority to JP2020506900A priority patent/JP6868747B2/en
Publication of WO2020113870A1 publication Critical patent/WO2020113870A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/006—Production of coal-bed methane
    • 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/20—Displacing by water
    • 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
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • 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
    • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
    • 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
    • E21F16/00—Drainage
    • 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

Definitions

  • the present invention relates to the technical field, and in particular to a method for cooperative drainage of roof delamination water and coal-based gas.
  • coal-based gas drainage and production methods are diverse, including straight wells, cluster wells, U-shaped wells, multi-branch horizontal wells, etc.
  • coal seams in China are generally characterized by low porosity and permeability, so their production is low. The economic benefits are poor.
  • Patent document CN10481131A the patent title is "A CBM Well Up and Down Stereo Combined Extraction Method" does not disclose the simultaneous stage of hydrophobic gas production and the stage of single-thin roof water separation, only a single drainage of coal bed methane, the patent Although it is possible to realize three-dimensional combined drainage of coalbed methane up and down the well, it cannot solve the problem that the casing of the horizontal well caused by coal mining is damaged by the surrounding rock and cannot continue to discharge coalbed methane, nor can it be compatible with mine safety. Other issues related to production.
  • the present invention provides a method for cooperative drainage of roof delaminated water and coal-based gas, which combines coal-based gas drainage, coal production, and mine delamination water hazard prevention to reduce coal
  • the gas content in the coal seam, working face, goaf and roadway during mining is to reduce the harm of gas to the safety production of coal mines. It can also promote the desorption output of methane under the influence of coal mining and increase the output of coal system gas. It can prevent and control the delamination water in the delamination space in the roof of the coal mine goaf, and prevent the occurrence of secondary roof delamination water hazard accidents, which has great economic and social benefits.
  • the technical scheme adopted by the present invention is: a method for cooperative drainage of roof separation water and coal-based gas.
  • the coal-rock layer profile structure includes a U-shaped well and a drainage device, a goaf, a coal bed, a curved subsidence zone, Working face, hard rock layer, weak rock layer, separation space and unmined area
  • the U-shaped well includes vertical well, horizontal well, horizontal section of horizontal well, vertical section of horizontal well and inclined section of horizontal well
  • the drainage and production device Including tube pump, tubing, sucker rod, conventional casing, glass fiber reinforced plastic casing, plastic butt pipe and sealing device
  • the drainage method includes the following steps: 1Single coal bed methane stage, before coal recovery
  • the horizontal section of the horizontal well is subjected to conventional casing directional perforation and segmented hydraulic fracturing.
  • the perforation direction is vertically downward.
  • the vertical well is mainly used for drainage operations.
  • the horizontal well is used for gas extraction, and the fracturing fractures affect the coal in the coal seam and the coal roof.
  • the system gas is used for extraction.
  • the extraction method is negative pressure extraction. According to the statistical results of U-type wells with a general gas recovery period of 8 to 10 years, in order to ensure gas recovery efficiency, the discharge time is set to 8 years;
  • 3Single alienation layer water stage continue to advance on the working face until the working face is close to the corresponding position of the vertical section of the horizontal well, close the sealing device, at this time, formed in the horizontal section of the horizontal well and the curved subsidence zone
  • the delamination water in the upper delamination space is led by the fissures to conduct water into the delamination space below it.
  • the vertical section of the vertical well, the horizontal section of the horizontal well and the water that has not been destroyed by the surrounding rock The horizontal section of the horizontal well is drained at the same time to prevent the occurrence of water inrush accidents from the layer, to ensure the safety of the underground working face.
  • the horizontal section of the horizontal well is set in the area between the rock system where the first layer that appears at the bottom end of the curved subsidence zone of the mined-out area is a hard rock layer above and a weak rock layer below, and the vertical well is close to the working face
  • the horizontal well is away from the working face, and the horizontal section of the horizontal well is connected to the vertical section of the horizontal well through the horizontal well deflection section.
  • the horizontal section of the horizontal well is set on the side of the return air lane close to the working face.
  • the delaminated space is directed The first sealing device on the side of the unmined area is opened to seal the horizontal section of the horizontal well into two parts.
  • the unmined area is still drained of coal system gas, and the goaf area is drained for the purpose of draining the delaminated water , And taking into account the extraction of coal system gas in the mined-out area, with the progress of the mining work, open the newly formed delamination space to the first sealing device immediately adjacent to the side of the unmined area, and close the opened delamination space to the
  • the sealing device of the vertical well makes the horizontal section of the horizontal well divided into two sections of hydrophobic and gas production, until the coal seam is recovered to the corresponding position of the vertical section of the horizontal well, and the last sealing device is closed.
  • the horizontal section of the damaged horizontal well is simultaneously drained.
  • the installation position of the sealing device is determined according to the length of each section of the caving coal mining design.
  • the number of installation of the sealing device is n-1 (n is the number of caving sections).
  • n is the number of caving sections.
  • m is the number of conventional casings
  • the beneficial effects of the present invention are: using this method of cooperative drainage of roof delaminated water and coal-based gas, it can combine coal-based gas drainage, coal production, and prevention of mine delamination water damage.
  • it can not only reduce the gas content in coal seam, working face, goaf and roadway during coal mining, reduce the harm of gas to coal mine safety production, but also promote the desorption output of methane and increase coal under the influence of coal mining
  • the gas production can also prevent the delamination water in the delamination space in the roof of the coal mine goaf and prevent the occurrence of secondary delamination water damage accidents.
  • FIG. 1 is a schematic diagram of a stage in which hydrophobic gas production is synchronized in a method for cooperating drainage of roof layer separation water and coal system gas;
  • Fig. 3 is a schematic diagram of the water stage of a single alienation layer in the present invention.
  • 1-straight well 2-horizontal well, 3-horizontal well horizontal section, 4-horizontal well vertical section, 5-horizontal well deviating section, 6-sealing device, 7-goaf area, 8-coal seam, 9 -Bending subsidence zone, 10-working face, 11-hard rock formation, 12-weak rock formation, 13-separation space, 14-uncut area, 15-tube pump, 16-oil pipe, 17-sucker rod, 18 -Conventional casing, 19-fiberglass casing, 20-plastic butt joint.
  • the hydrophobic gas production is divided into three stages, including: 1Single coal bed methane production stage, 2Synchronized hydrophobic gas production stage, 3Single roof separation layer water stage; 1If Figure 1:
  • the single-bed coal bed methane stage is the conventional casing 18 directional perforation and segmented hydraulic fracturing of the horizontal section 3 of the horizontal well of the U-shaped well before coal recovery.
  • the perforation direction is vertically downward, and the vertical well 1 is mainly Carry out drainage operations, gas production in horizontal well 2, fracturing fractures to extract coal system gas in coal seam 8 and coal seam roof, the extraction method is negative pressure extraction, and the general gas production period of U-type wells is 8 to 10 years In order to ensure the efficiency of gas production, the discharge time is set to 8 years.
  • the synchronized stage of hydrophobic gas production is that after 8 years of separate gas production, coal seam 8 begins to recover, and after the formation of goaf 7, the use of sealing device 6 in the horizontal section of horizontal well 3 corresponds to the position of working face 10
  • the casing 18 is sealed to divide the horizontal section 3 of the horizontal well into two sections, which are the drainage section of the mined area 7 and the gas production section of the unmined area 14 respectively.
  • the empty zone 7 bends the sinking zone 9 and the delamination water in the delamination space 13 is drained.
  • the coal seam 8 on the side of the unmined zone 14 close to the goaf 7 is affected by the mining of the working face 10, and further depressurization and desorption.
  • the single-separation layer water stage is to continue to move forward in the working face 10 until the working face 10 is close to the corresponding position of the vertical section 4 of the horizontal well, and the sealing device 6 is closed. At this time, in the horizontal section 3 of the horizontal well and its Multiple sets of delamination spaces 13 are formed within the upper curved subsidence zone 9, and the delamination water in the upper delamination space 13 is conducted by the fissure, and conducts water into the delamination space 13 underneath. 3.
  • the vertical section 4 of the horizontal well and the horizontal section 3 of the horizontal well that are not damaged by the surrounding rock are simultaneously drained to prevent the occurrence of water inrush from the layer, to ensure the safety of the underground working face 10, and to close the well after the recovery of the working face 10 is completed.
  • the design position of the extraction well is determined according to the plan layout drawing of the mining excavation project, a vertical well is constructed at the starting end of the mining area, a horizontal well 2 is constructed along the advancing direction of the working face 10, and the horizontal well is vertical at the end point of the mining Section 4, horizontal well Horizontal section 3 is located in the area between the first series of hard rock layers 11 and soft rock layers 12 at the bottom of the curved subsidence zone 9 from bottom to top.
  • the vertical well 1 is slightly deeper than Horizontal section 3 of horizontal wells, but not deep into the fracture zone, both horizontal well 2 and vertical well 1 adopt negative pressure extraction.
  • the horizontal section 3 of the horizontal well is preferentially arranged on the side of the return air lane 10 close to the recovery face. If the recovery coal seam is a coal seam with a higher gas content, the air intake lane near the recovery face 10 can be used.
  • a group of U-shaped wells with the same structure are arranged at the corresponding positions.
  • both the horizontal well 2 and the vertical well 1 are drilled with a large-diameter drilling tool, and a glass fiber reinforced plastic casing 19 is provided at the junction of the horizontal section 3 of the horizontal well and the vertical well 1, and the butt section of the vertical well 1 is mechanically expanded.
  • the diameter of the section is 0.5m, which is convenient for the docking of the horizontal section 3 of the horizontal well and the vertical well 1.
  • conventional casing 18 is used to cement the vertical section 4 of the horizontal well, the deflection section 5 of the horizontal well and the vertical well 1 except for the butting section.
  • the conventional casing 18 has an inner diameter of 200 mm and 3 sets of horizontal sections
  • the tube assembly is a conventional casing 18 connected with a plastic butt joint tube 20.
  • the plastic butt joint tube 20 can plastically expand and contract when the surrounding rock is deformed to ensure the horizontal connectivity of the horizontal section 3 of the horizontal well.
  • a tubular pump 15 is installed in the lower part of the butt joint section of the vertical well 1 and the horizontal section 3 of the horizontal well and the bottom of the vertical section 4 of the horizontal well.
  • the tubing pump 15 is connected to the tubing 16 above the tubing 16 and the inside of the tubing 16 is a sucker rod 17.
  • the number of installations of the sealing device 6 is n-1 (n is the number of caving sections).
  • n-1 is the number of caving sections.
  • the embodiment of the present invention discloses a preferred embodiment, but it is not limited to this. Those of ordinary skill in the art can easily understand the spirit of the present invention and make different extensions and changes based on the above embodiments. But as long as it does not deviate from the spirit of the present invention, it is within the protection scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
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Abstract

A method for cooperatively draining roof separation water and mining a coal-measure gas. The section structure of a coal stratum comprises: a vertical well (1), a horizontal well (2), a horizontal section (3) of the horizontal well, a vertical section (4) of the horizontal well, an inclined section (5) of the horizontal well, a sealing device (6), a goaf (7), a coal seam (8), a curve subsidence zone (9), a working face (10), a hard stratum (11), a soft stratum (12), a separation space (13), and an unmined area (14). Said method comprises the following steps: a stage of only mining coal-measure gas; a stage of synchronously draining water and mining gas; and a stage of only draining roof separation water. Said method combines coal-measure gas mining, coal production, and mine separation water disaster prevention and control, reduces the mash gas content in the coal seam, the working face, the goaf and a roadway during coal stoping so as to reduce the harm from mash gas on mine safe production, and promotes the desorption and production of methane under the effect of coal mining, increases the yield of coal-measure gas, and also controls the separation water in the separation space in the roof of the goaf, so as to prevent the occurrence of a secondary roof separation water disaster.

Description

一种顶板离层水与煤系气协同疏排方法Method for synergic drainage of roof separation water and coal system gas 技术领域Technical field

本发明涉及技术领域，特别是涉及一种顶板离层水与煤系气协同疏排方法。The present invention relates to the technical field, and in particular to a method for cooperative drainage of roof delamination water and coal-based gas.

背景技术Background technique

我国煤矿水害频发，虽然常规水害防治技术及防治能力处于国际领先水平，但在没有较强含水层的条件下出现的顶板次生离层水害方面，防治难度仍然较大，此类水害具有危害大、瞬间涌水量大、前兆不明显、总水量较小、存在周期性的特征，成为危害矿井安全生产的一种隐患，但目前离层水害的防治难度较大，研究成果仍集中于离层形成机理、分布规律等方面，且防治成本较高，因此，提出一种经济有效的矿井离层水治理方法具有重要的理论及现实意义。Coal mine water hazards occur frequently in China. Although conventional water hazard prevention technologies and prevention capabilities are at the international advanced level, it is still difficult to prevent and control secondary secondary delamination water hazards that occur without strong aquifers. Such water hazards are harmful The characteristics of large, instantaneous water influx, unclear precursors, small total water volume, and periodicity have become a hidden danger to the safety of mine production. However, the prevention and control of delaminated water hazards is currently more difficult, and the research results are still concentrated in the delaminated layer The formation mechanism, distribution law and other aspects, and the cost of prevention and treatment are relatively high. Therefore, it is of great theoretical and practical significance to propose a cost-effective method for mine delamination water treatment.

现有的煤系气排采方法多样，包括直井、丛式井、U型井、多分支水平井等多种类型，但我国煤层普遍具有孔隙度和渗透率低的特点，因此产量较低，经济效益较差。Existing coal-based gas drainage and production methods are diverse, including straight wells, cluster wells, U-shaped wells, multi-branch horizontal wells, etc. However, coal seams in China are generally characterized by low porosity and permeability, so their production is low. The economic benefits are poor.

专利文献CN10481131A，专利名称为“一种煤层气井上下立体联合抽采方法”中并未披露疏水采气同步进行阶段和单疏顶板离层水阶段，只是单一的排采煤层气，该专利虽然可以实现对煤层气的井上下立体联合排采，但却无法解决受煤层采动影响导致的水平井套管被围岩破坏而无法继续排采煤层气的难题，也无法兼顾与矿井安全生产相关的其他问题。Patent document CN10481131A, the patent title is "A CBM Well Up and Down Stereo Combined Extraction Method" does not disclose the simultaneous stage of hydrophobic gas production and the stage of single-thin roof water separation, only a single drainage of coal bed methane, the patent Although it is possible to realize three-dimensional combined drainage of coalbed methane up and down the well, it cannot solve the problem that the casing of the horizontal well caused by coal mining is damaged by the surrounding rock and cannot continue to discharge coalbed methane, nor can it be compatible with mine safety. Other issues related to production.

发明内容Summary of the invention

为了克服上述现有技术的不足，本发明提供了一种顶板离层水与煤系气协同疏排方法，将煤系气排采、煤炭生产、矿井离层水害防治相结合，既可以降低煤炭回采时煤层、工作面、采空区和巷道中的瓦斯含量，减轻瓦斯对煤矿安全生产的危害，又可以在煤炭采动的影响下促进甲烷的解吸产出，增大煤系气产量，还可以防治煤矿采空区顶板中离层空间中的离层水，预防次生顶板离层水害事故的发生，具有很大的经济效益和社会效益。In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a method for cooperative drainage of roof delaminated water and coal-based gas, which combines coal-based gas drainage, coal production, and mine delamination water hazard prevention to reduce coal The gas content in the coal seam, working face, goaf and roadway during mining is to reduce the harm of gas to the safety production of coal mines. It can also promote the desorption output of methane under the influence of coal mining and increase the output of coal system gas. It can prevent and control the delamination water in the delamination space in the roof of the coal mine goaf, and prevent the occurrence of secondary roof delamination water hazard accidents, which has great economic and social benefits.

本发明所采用的技术方案是：一种顶板离层水与煤系气协同疏排方法，所述煤岩层剖面结构包括U型井和排采装置以及采空区、煤层、弯曲下沉带、工作面、坚硬岩层、软弱岩层、离层空间和未采区，所述U型井包括直井、水平井、水平井水平段、水平井竖直段和水平井造斜段，所述排采装置包括管式泵、油管、抽油杆、常规套管、玻璃钢套管、塑性对接管和密封装置，所述疏排方法包括以下步骤：①单采煤层气阶段，在煤炭回采之前，对U型井的水平井水平段进行常规套管定向射孔和分段水力压裂，射孔方向垂直向下，直井主要进行排水作业，水平井采气，压裂裂缝对煤层及煤层顶板中的煤系气进行抽采，抽采 方式为负压抽采，依据U型井一般采气年限为8～10年的统计结果，为保证采气效益，设定排采时间为8年；The technical scheme adopted by the present invention is: a method for cooperative drainage of roof separation water and coal-based gas. The coal-rock layer profile structure includes a U-shaped well and a drainage device, a goaf, a coal bed, a curved subsidence zone, Working face, hard rock layer, weak rock layer, separation space and unmined area, the U-shaped well includes vertical well, horizontal well, horizontal section of horizontal well, vertical section of horizontal well and inclined section of horizontal well, the drainage and production device Including tube pump, tubing, sucker rod, conventional casing, glass fiber reinforced plastic casing, plastic butt pipe and sealing device, the drainage method includes the following steps: ①Single coal bed methane stage, before coal recovery The horizontal section of the horizontal well is subjected to conventional casing directional perforation and segmented hydraulic fracturing. The perforation direction is vertically downward. The vertical well is mainly used for drainage operations. The horizontal well is used for gas extraction, and the fracturing fractures affect the coal in the coal seam and the coal roof. The system gas is used for extraction. The extraction method is negative pressure extraction. According to the statistical results of U-type wells with a general gas recovery period of 8 to 10 years, in order to ensure gas recovery efficiency, the discharge time is set to 8 years;

②疏水采气同步进行阶段，在单独采气8年后，煤层开始回采，采空区形成之后，利用密封装置在水平井水平段对应于工作面位置的常规套管进行封隔，将水平井水平段分隔为两段，分别是采空区疏水段和未采区采气段，对未采区煤系气继续排采，并对采空区弯曲下沉带离层空间中的离层水进行疏干，此时，未采区靠近采空区一侧煤层受到工作面采动影响，进一步降压解吸，增大水平井日产气量；②Synchronized stage of hydrophobic gas production. After 8 years of independent gas production, the coal seam starts to recover. After the mined-out area is formed, the conventional well casing corresponding to the working face position in the horizontal section of the horizontal well is sealed with a sealing device to separate the horizontal well. The horizontal section is divided into two sections, which are the drainage section of the mined-out area and the gas extraction section of the un-mined area. The coal-series gas in the unmined area is continuously discharged, and the delaminated water in the delaminated space in the curved subsidence zone of the mined-out area Drainage is carried out. At this time, the coal seam on the side of the unmined area close to the goaf is affected by mining at the working face, and further depressurization and desorption to increase the daily gas production of the horizontal well;

③单疏离层水阶段，在工作面持续向前推进，直至工作面临近水平井竖直段对应位置，关闭密封装置，此时，在水平井水平段及其上的弯曲下沉带范围内形成了多组离层空间，上层离层空间中的离层水被裂隙导通，向其下的离层空间内导水，此时利用直井、水平井竖直段以及未被围岩破坏的水平井水平段同时进行疏水，防止离层突水事故发生，保证井下工作面安全，待工作面回采完成后，封井。③Single alienation layer water stage, continue to advance on the working face until the working face is close to the corresponding position of the vertical section of the horizontal well, close the sealing device, at this time, formed in the horizontal section of the horizontal well and the curved subsidence zone There are multiple sets of delamination spaces. The delamination water in the upper delamination space is led by the fissures to conduct water into the delamination space below it. At this time, the vertical section of the vertical well, the horizontal section of the horizontal well and the water that has not been destroyed by the surrounding rock The horizontal section of the horizontal well is drained at the same time to prevent the occurrence of water inrush accidents from the layer, to ensure the safety of the underground working face.

进一步地，所述水平井水平段设置在采空区弯曲下沉带底端由下而上出现的第一层上为坚硬岩层、下为软弱岩层的岩系之间的区域，直井靠近工作面一侧，水平井远离工作面，水平井水平段通过水平井造斜段与水平井竖直段连通，水平井水平段设置在靠近回采工作面回风巷一侧，当回采煤层为瓦斯含量较高的煤层时，在靠近回采工作面进风巷的对应位置布置一组相同结构的U型井。Further, the horizontal section of the horizontal well is set in the area between the rock system where the first layer that appears at the bottom end of the curved subsidence zone of the mined-out area is a hard rock layer above and a weak rock layer below, and the vertical well is close to the working face On one side, the horizontal well is away from the working face, and the horizontal section of the horizontal well is connected to the vertical section of the horizontal well through the horizontal well deflection section. The horizontal section of the horizontal well is set on the side of the return air lane close to the working face. When the coal seam is high, a group of U-shaped wells with the same structure are arranged at the corresponding positions close to the intake roadway of the mining face.

进一步地，所述回采工作面后方形成的采空区顶板弯曲下沉带内，容易陆续分层出现离层空间并汇集离层水，将水平井水平段布置在最下层可能形成离层空间的坚硬岩层底部紧邻的软弱岩层顶界内，该层段首先形成第一组离层空间，同时也是最下层的离层空间，随回采工作进行，待离层空间形成后，将该离层空间指向未采区一侧紧邻的第一个密封装置打开，使水平井水平段密封为两部分，未采区仍进行煤系气的排采，采空区进行以疏干离层水为目的排水作业，并兼顾采空区煤系气的抽采，随着回采工作的进行，依次打开最新形成的离层空间指向未采区一侧紧邻的第一个密封装置，关闭已打开的离层空间指向直井的密封装置，使水平井水平段始终分为疏水、采气两段，直至煤层回采至水平井竖直段相应位置，关闭最后一个密封装置，直井、水平井竖直段以及未被围岩破坏的水平井水平段同时进行疏水作业。Further, in the curved sinking zone of the goaf roof formed behind the mining face, it is easy to stratify successively the delamination space and collect delamination water, and arrange the horizontal section of the horizontal well in the lowest layer may form the delamination space. In the top of the weak rock layer immediately adjacent to the bottom of the hard rock layer, this interval first forms the first set of delaminated space, which is also the lowermost delaminated space. As the mining work progresses, after the delaminated space is formed, the delaminated space is directed The first sealing device on the side of the unmined area is opened to seal the horizontal section of the horizontal well into two parts. The unmined area is still drained of coal system gas, and the goaf area is drained for the purpose of draining the delaminated water , And taking into account the extraction of coal system gas in the mined-out area, with the progress of the mining work, open the newly formed delamination space to the first sealing device immediately adjacent to the side of the unmined area, and close the opened delamination space to the The sealing device of the vertical well makes the horizontal section of the horizontal well divided into two sections of hydrophobic and gas production, until the coal seam is recovered to the corresponding position of the vertical section of the horizontal well, and the last sealing device is closed. The horizontal section of the damaged horizontal well is simultaneously drained.

进一步地，按照放顶煤回采设计中每段放顶长度确定密封装置的安装位置，密封装置的安装数量为n-1(n为放顶段数)，在水平井水平段两常规套管间的对接处连接塑性对接管，共需连接m-1根塑性对接管(m为常规套管根数)。Further, the installation position of the sealing device is determined according to the length of each section of the caving coal mining design. The number of installation of the sealing device is n-1 (n is the number of caving sections). To connect plastic butt joints at the butt joints, a total of m-1 plastic butt joints (m is the number of conventional casings) need to be connected.

与现有技术相比，本发明的有益效果是：使用该一种顶板离层水与煤系气协同疏排方法，可以将煤系气排采、煤炭生产、矿井离层水害防治相结合，，既可以降低煤炭回采时煤层、工作面、采空区和巷道中的瓦斯含量，减轻瓦斯对煤矿安全生产的危害，又可以在煤炭采动的影响下促进甲烷的解吸产出，增大煤系气产量，还可以防治煤矿采空区顶板中离层空间中的离层水，预防次生顶板离层水害事故的发生。Compared with the prior art, the beneficial effects of the present invention are: using this method of cooperative drainage of roof delaminated water and coal-based gas, it can combine coal-based gas drainage, coal production, and prevention of mine delamination water damage. , Can not only reduce the gas content in coal seam, working face, goaf and roadway during coal mining, reduce the harm of gas to coal mine safety production, but also promote the desorption output of methane and increase coal under the influence of coal mining The gas production can also prevent the delamination water in the delamination space in the roof of the coal mine goaf and prevent the occurrence of secondary delamination water damage accidents.

附图说明BRIEF DESCRIPTION

图1为本发明一种顶板离层水与煤系气协同疏排方法中疏水采气同步进行阶段示意图；FIG. 1 is a schematic diagram of a stage in which hydrophobic gas production is synchronized in a method for cooperating drainage of roof layer separation water and coal system gas;

图2为本发明中单采煤层气阶段示意图；2 is a schematic diagram of the single-bed coal bed methane phase in the present invention;

图3为本发明中单疏离层水阶段示意图。Fig. 3 is a schematic diagram of the water stage of a single alienation layer in the present invention.

其中:1-直井，2-水平井，3-水平井水平段，4-水平井竖直段，5-水平井造斜段，6-密封装置，7-采空区，8-煤层，9-弯曲下沉带，10-工作面，11-坚硬岩层，12-软弱岩层，13-离层空间，14-未采区，15-管式泵，16-油管，17-抽油杆，18-常规套管，19-玻璃钢套管，20-塑性对接管。Among them: 1-straight well, 2-horizontal well, 3-horizontal well horizontal section, 4-horizontal well vertical section, 5-horizontal well deviating section, 6-sealing device, 7-goaf area, 8-coal seam, 9 -Bending subsidence zone, 10-working face, 11-hard rock formation, 12-weak rock formation, 13-separation space, 14-uncut area, 15-tube pump, 16-oil pipe, 17-sucker rod, 18 -Conventional casing, 19-fiberglass casing, 20-plastic butt joint.

具体实施方式detailed description

为了加深对本发明的理解，下面结合附图和实施例对本发明进一步说明，该实施例仅用于解释本发明，并不对本发明的保护范围构成限定。In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the drawings and embodiments. This embodiment is only used to explain the present invention and does not limit the protection scope of the present invention.

如图1所示，本发明中，疏水采气工作共分为三个阶段，包括：①单采煤层气阶段，②疏水采气同步进行阶段，③单疏顶板离层水阶段；①如图1：单采煤层气阶段是在煤炭回采之前，对U型井的水平井水平段3进行常规套管18定向射孔和分段水力压裂，射孔方向垂直向下，直井1主要进行排水作业，水平井2采气，压裂裂缝对煤层8及煤层顶板中的煤系气进行抽采，抽采方式为负压抽采，依据U型井一般采气年限为8～10年的统计结果，为保证采气效益，设定排采时间为8年。②如图2：疏水采气同步进行阶段是在单独采气8年后，煤层8开始回采，采空区7形成之后，利用密封装置6在水平井水平段3对应于工作面10位置的常规套管18进行封隔，将水平井水平段3分隔为两段，分别是采空区7疏水段和未采区14采气段，对未采区14煤系气继续排采，并对采空区7弯曲下沉带9离层空间13中的离层水进行疏干，此时，未采区14靠近采空区7一侧煤层8受到工作面10采动影响，进一步降压解吸，增大水平井2日产气量。③如图3：单疏离层水阶段是在工作面10持续向前推进，直至工作面10临近水平井竖直段4对应位置，关闭密封装置6，此时，在水平井水平段3及其上的弯曲下沉带9范围内形成了多组离层空间13，上层离层空间13中的离层水被裂隙导通，向其下的离层空间13内导水，此时利用直井1、水平井竖直段4以及未 被围岩破坏的水平井水平段3同时进行疏水，防止离层突水事故发生，保证井下工作面10安全，待工作面10回采完成后，封井。As shown in FIG. 1, in the present invention, the hydrophobic gas production is divided into three stages, including: ①Single coal bed methane production stage, ②Synchronized hydrophobic gas production stage, ③Single roof separation layer water stage; ①If Figure 1: The single-bed coal bed methane stage is the conventional casing 18 directional perforation and segmented hydraulic fracturing of the horizontal section 3 of the horizontal well of the U-shaped well before coal recovery. The perforation direction is vertically downward, and the vertical well 1 is mainly Carry out drainage operations, gas production in horizontal well 2, fracturing fractures to extract coal system gas in coal seam 8 and coal seam roof, the extraction method is negative pressure extraction, and the general gas production period of U-type wells is 8 to 10 years In order to ensure the efficiency of gas production, the discharge time is set to 8 years. ②As shown in Figure 2: The synchronized stage of hydrophobic gas production is that after 8 years of separate gas production, coal seam 8 begins to recover, and after the formation of goaf 7, the use of sealing device 6 in the horizontal section of horizontal well 3 corresponds to the position of working face 10 The casing 18 is sealed to divide the horizontal section 3 of the horizontal well into two sections, which are the drainage section of the mined area 7 and the gas production section of the unmined area 14 respectively. The empty zone 7 bends the sinking zone 9 and the delamination water in the delamination space 13 is drained. At this time, the coal seam 8 on the side of the unmined zone 14 close to the goaf 7 is affected by the mining of the working face 10, and further depressurization and desorption. Increase the gas production of horizontal wells for 2 days. ③ As shown in Figure 3: The single-separation layer water stage is to continue to move forward in the working face 10 until the working face 10 is close to the corresponding position of the vertical section 4 of the horizontal well, and the sealing device 6 is closed. At this time, in the horizontal section 3 of the horizontal well and its Multiple sets of delamination spaces 13 are formed within the upper curved subsidence zone 9, and the delamination water in the upper delamination space 13 is conducted by the fissure, and conducts water into the delamination space 13 underneath. 3. The vertical section 4 of the horizontal well and the horizontal section 3 of the horizontal well that are not damaged by the surrounding rock are simultaneously drained to prevent the occurrence of water inrush from the layer, to ensure the safety of the underground working face 10, and to close the well after the recovery of the working face 10 is completed.

在上述实施例中，依据矿井采掘工程平面布置图确定抽采井的设计位置，在采区回采起始端施工直井，沿工作面10推进方向施工水平井2，在回采终点端为水平井竖直段4，水平井水平段3位于弯曲下沉带9底端由下而上出现的第一层上为坚硬岩层11、下为软弱岩层12的岩系之间的区域，直井1深度略深于水平井水平段3，但不可深入裂隙带，水平井2与直井1均采用负压抽采。In the above embodiment, the design position of the extraction well is determined according to the plan layout drawing of the mining excavation project, a vertical well is constructed at the starting end of the mining area, a horizontal well 2 is constructed along the advancing direction of the working face 10, and the horizontal well is vertical at the end point of the mining Section 4, horizontal well Horizontal section 3 is located in the area between the first series of hard rock layers 11 and soft rock layers 12 at the bottom of the curved subsidence zone 9 from bottom to top. The vertical well 1 is slightly deeper than Horizontal section 3 of horizontal wells, but not deep into the fracture zone, both horizontal well 2 and vertical well 1 adopt negative pressure extraction.

在上述实施例中，在平面上，水平井水平段3优先布置在靠近回采工作面10回风巷一侧，若回采煤层为瓦斯含量较高的煤层，可在靠近回采工作面10进风巷的对应位置布置一组相同结构的U型井。In the above embodiment, on the plane, the horizontal section 3 of the horizontal well is preferentially arranged on the side of the return air lane 10 close to the recovery face. If the recovery coal seam is a coal seam with a higher gas content, the air intake lane near the recovery face 10 can be used. A group of U-shaped wells with the same structure are arranged at the corresponding positions.

在上述实施例中，水平井2和直井1均采用大直径钻具钻进，在水平井水平段3与直井1的对接处设置玻璃钢套管19，并对直井1对接段进行机械扩径，使该段直径达到0.5m，便于水平井水平段3与直井1的对接。In the above embodiment, both the horizontal well 2 and the vertical well 1 are drilled with a large-diameter drilling tool, and a glass fiber reinforced plastic casing 19 is provided at the junction of the horizontal section 3 of the horizontal well and the vertical well 1, and the butt section of the vertical well 1 is mechanically expanded. The diameter of the section is 0.5m, which is convenient for the docking of the horizontal section 3 of the horizontal well and the vertical well 1.

在上述实施例中，水平井竖直段4、水平井造斜段5和直井1除对接段以外的部位采用常规套管18固井，常规套管18内径为200mm，水平井水平段3套管组合为常规套管18与塑性对接管20相间连接，塑性对接管20可以在围岩变形时发生塑性伸缩，保证水平井水平段3井筒横向连通性。In the above embodiments, conventional casing 18 is used to cement the vertical section 4 of the horizontal well, the deflection section 5 of the horizontal well and the vertical well 1 except for the butting section. The conventional casing 18 has an inner diameter of 200 mm and 3 sets of horizontal sections The tube assembly is a conventional casing 18 connected with a plastic butt joint tube 20. The plastic butt joint tube 20 can plastically expand and contract when the surrounding rock is deformed to ensure the horizontal connectivity of the horizontal section 3 of the horizontal well.

在上述实施例中，在直井1与水平井水平段3对接段的下部和水平井竖直段4的底部安装管式泵15，管式泵15上方连接油管16，油管16内部为抽油杆17，按照放顶煤回采设计中每段放顶长度确定密封装置6的安装位置，密封装置6的安装数量为n-1(n为放顶段数)，在水平井水平段3两常规套管18间的对接处连接塑性对接管20，共需连接m-1根塑性对接管20(m为套管根数)。In the above embodiment, a tubular pump 15 is installed in the lower part of the butt joint section of the vertical well 1 and the horizontal section 3 of the horizontal well and the bottom of the vertical section 4 of the horizontal well. The tubing pump 15 is connected to the tubing 16 above the tubing 16 and the inside of the tubing 16 is a sucker rod 17. Determine the installation position of the sealing device 6 according to the length of each section of the caving coal mining design. The number of installations of the sealing device 6 is n-1 (n is the number of caving sections). In the horizontal section of the horizontal well 3 two conventional casings The butt joint between 18 is connected to the plastic butt joint pipe 20, and a total of m-1 plastic butt joint pipes 20 (m is the number of casing roots) need to be connected.

本发明的实施例公布的是较佳的实施例，但并不局限于此，本领域的普通技术人员，极易根据上述实施例，领会本发明的精神，并做出不同的引申和变化，但只要不脱离本发明的精神，都在本发明的保护范围内。The embodiment of the present invention discloses a preferred embodiment, but it is not limited to this. Those of ordinary skill in the art can easily understand the spirit of the present invention and make different extensions and changes based on the above embodiments. But as long as it does not deviate from the spirit of the present invention, it is within the protection scope of the present invention.

Claims (5)

一种顶板离层水与煤系气协同疏排方法，所述煤岩层剖面结构包括U型井和排采装置以及采空区(7)、煤层(8)、弯曲下沉带(9)、工作面(10)、坚硬岩层(11)、软弱岩层(12)、离层空间(13)和未采区(14)，所述U型井包括直井(1)、水平井(2)、水平井水平段(3)、水平井竖直段(4)和水平井造斜段(5)，其特征在于，所述排采装置包括管式泵(15)、油管(16)、抽油杆(17)、常规套管(18)、玻璃钢套管(19)、塑性对接管(20)和密封装置(6)，所述疏排方法包括以下步骤：①单采煤层气阶段，在煤炭回采之前，对水平井水平段(3)进行常规套管(11)定向射孔和分段水力压裂，射孔方向垂直向下，直井(1)主要进行排水作业，水平井(2)采气，压裂裂缝对煤层(8)及煤层(8)顶板中的煤系气进行抽采，抽采方式为负压抽采，设定排采时间为8年；A method for collaborative drainage of roof separation water and coal-series gas. The coal-rock layer profile structure includes a U-shaped well and a drainage device, a mined-out area (7), a coal seam (8), a curved subsidence zone (9), Working face (10), hard rock layer (11), weak rock layer (12), delamination space (13) and unmined area (14), the U-shaped well includes vertical well (1), horizontal well (2), water The horizontal section (3) of horizontal wells, the vertical section (4) of horizontal wells and the deflection section (5) of horizontal wells, characterized in that the drainage device includes a tubular pump (15), an oil pipe (16), and a sucker rod (17), conventional casing (18), glass fiber reinforced plastic casing (19), plastic butt pipe (20) and sealing device (6), the drainage method includes the following steps: ① single coal bed methane production stage, in coal Before recovery, the horizontal section (3) of the horizontal well is subjected to conventional casing (11) directional perforation and staged hydraulic fracturing, the perforation direction is vertically downward, the vertical well (1) is mainly used for drainage operations, and the horizontal well (2) is Gas and fracturing cracks are used to extract the coal-series gas in the coal seam (8) and the roof of the coal seam (8). The extraction method is negative pressure extraction, and the set drainage time is 8 years; ②疏水采气同步进行阶段，在单独采气8年后，煤层(8)开始回采，采空区(7)形成之后，利用密封装置(6)在水平井水平段(3)对应于工作面(10)位置的常规套管(18)进行封隔，将水平井水平段(3)分隔为两段，分别是采空区(7)疏水段和未采区(14)采气段，对未采区(14)煤系气继续排采，并对采空区(7)弯曲下沉带(9)离层空间(13)中的离层水进行疏干，对未采区(14)进一步降压解吸；②The stage of synchronous production of hydrophobic gas recovery. After 8 years of independent gas recovery, coal seam (8) starts to recover. After the goaf (7) is formed, the horizontal section (3) of the horizontal well corresponds to the working face using the sealing device (6) (10) The conventional casing (18) at the location is isolated, and the horizontal section (3) of the horizontal well is divided into two sections, which are the mined-out area (7) and the non-mined area (14). The unmined area (14) continues to discharge coal system gas, and drains the delaminated water in the gob area (7) curved subsidence zone (9) delamination space (13), and the unmined area (14) Further depressurization and desorption; ③单疏顶板离层水阶段，在工作面(10)持续向前推进，直至工作面(10)临近水平井竖直段(4)对应位置，关闭密封装置(6)，此时，在水平井水平段(3)及其上的弯曲下沉带(9)范围内形成了多组离层空间(13)，上层离层空间(13)中的离层水被裂隙导通，向其下的离层空间(13)内导水，此时利用直井(1)、水平井竖直段(4)以及未被围岩破坏的水平井水平段(3)同时进行疏水，待工作面(10)回采完成后，封井。③In the phase of water separation of the single thin roof, continue to advance on the working face (10) until the working face (10) is close to the corresponding position of the vertical section of the horizontal well (4), close the sealing device (6), at this time, in the water A plurality of sets of delamination spaces (13) are formed within the horizontal section (3) of the flat well and the curved subsidence zone (9) above, and the delamination water in the upper delamination space (13) is led by the fissure to the bottom Water is conducted in the delaminated space (13). At this time, the vertical well (1), the vertical section of the horizontal well (4) and the horizontal section of the horizontal well (3) that are not damaged by the surrounding rock are simultaneously drained, and the working face (10 ) After completion of mining, seal the well. 根据权利要求1所述的顶板离层水与煤系气协同疏排方法，其特征在于：所述水平井水平段(3)设置在采空区(7)弯曲下沉带(9)底端由下而上出现的第一层上为坚硬岩层(11)、下为软弱岩层(12)的岩系之间的区域，直井(1)靠近工作面(10)一侧，水平井(2)远离工作面(10)，水平井水平段(3)通过水平井造斜段(5)与水平井竖直段(4)连通，水平井水平段(3)设置在靠近回采工作面(10)回风巷一侧，当回采煤层为瓦斯含量较高的煤层时，在靠近回采工作面(10)进风巷的对应位置布置一组相同结构的U型井。The method for cooperative drainage of roof delamination water and coal measures gas according to claim 1, characterized in that the horizontal section (3) of the horizontal well is set at the bottom of the curved sinking zone (9) in the mined-out area (7) The first layer that appears from the bottom is the area between the rock series with the hard rock layer (11) above and the weak rock layer (12) below. The vertical well (1) is close to the working face (10) side and the horizontal well (2) Far from the working face (10), the horizontal section of the horizontal well (3) communicates with the vertical section of the horizontal well (4) through the horizontal well deflection section (5), and the horizontal section of the horizontal well (3) is set close to the mining face (10) On the side of the return airway, when the coal seam is a coal seam with a high gas content, a group of U-shaped wells with the same structure are arranged at the corresponding positions near the intake airway of the mining face (10). 根据权利要求1所述的顶板离层水与煤系气协同疏排方法，其特征在于：所述回采工作面(10)后方形成的采空区(7)顶板弯曲下沉带(9)内，容易陆续分层出现离层空间(13)并汇集离层水，将水平井水平段(3)布置在最下层可能形成离层空间的坚硬岩层(11)底部紧邻的软弱岩层(12)顶界内，该层段首先形成最下层的一组离层空间(13)，随回采工作进行，待离层空间形成后，将该离层空间指向未采区(14)一侧紧邻的第一个密封装置 (6)打开，使水平井水平段(3)密封为两部分，未采区(14)仍进行煤系气的排采，采空区(7)进行以疏干离层水为目的排水作业，并兼顾采空区(7)煤系气的抽采，随着回采工作的进行，依次打开最新形成的离层空间(13)指向未采区(14)一侧紧邻的第一个密封装置(6)，关闭已打开的离层空间(13)指向直井(1)的密封装置(6)，使水平井水平段(3)始终分为疏水、采气两段，直至煤层回采至水平井竖直段(4)相应位置，关闭最后一个密封装置(6)，直井(1)、水平井竖直段(4)以及未被围岩破坏的水平井水平段(3)同时进行疏水作业。The method for cooperative drainage of roof layer delamination water and coal system gas according to claim 1, characterized in that: the mined-out area (7) formed behind the mining face (10) is in the curved roof sinking zone (9) , It is easy to stratify successively the delamination space (13) and collect delamination water, arrange the horizontal section of the horizontal well (3) at the bottom of the hard rock layer (11) that may form the delamination space and the top of the weak rock layer (12) Within the boundary, the lowermost layer of delamination space (13) is first formed in this interval, and the mining work will be carried out. After the delamination space is formed, the delamination space will be directed to the first immediately adjacent to the side of the unmined area (14) The sealing device (6) is opened to seal the horizontal section (3) of the horizontal well into two parts. The un-mined area (14) is still discharging coal-series gas, and the mined-out area (7) is used to drain the delaminated water as The purpose of drainage operation, taking into account the extraction of coal gas in the mined-out area (7), as the recovery work progresses, open the newly formed delamination space (13) to the first adjacent to the side of the unmined area (14) A sealing device (6), which closes the sealing device (6) of the opened delamination space (13) and points to the vertical well (1), so that the horizontal section (3) of the horizontal well is always divided into two sections of hydrophobic and gas production until coal seam recovery To the corresponding position of the vertical section of the horizontal well (4), close the last sealing device (6), the vertical well (1), the vertical section of the horizontal well (4) and the horizontal section of the horizontal well (3) that has not been damaged by the surrounding rock Hydrophobic operation. 根据权利要求1所述的顶板离层水与煤系气协同疏排方法，其特征在于：所述管式泵(15)设置在直井(1)与水平井水平段(3)对接段的下部和水平井竖直段(4)的底部，管式泵(15)上方连接油管(16)，油管(16)内部为抽油杆(17)，按照放顶煤回采设计中每段放顶长度确定密封装置的安装位置，密封装置(6)的安装数量为n-1(n为放顶段数)，在水平井水平段(3)两常规套管(11)间的对接处连接塑性对接管(20)，共需连接m-1根塑性对接管(20)(m为常规套管根数)。The method for cooperative drainage of roof separation water and coal system gas according to claim 1, characterized in that the tubular pump (15) is arranged at the lower part of the butt joint section of the vertical well (1) and the horizontal section (3) of the horizontal well Connected to the bottom of the vertical section (4) of the horizontal well, the tubing (15) is connected above the tubing pump (15), and the tubing (16) has a sucker rod (17) inside, according to the length of each section of the top coal recovery design Determine the installation position of the sealing device, the number of installation of the sealing device (6) is n-1 (n is the number of topping section), and connect the plastic butt pipe at the butt joint between the two conventional casings (11) in the horizontal section (3) of the horizontal well (20), it is necessary to connect m-1 plastic butt joint pipes (20) (m is the number of conventional casing). 根据权利要求1所述的顶板离层水与煤系气协同疏排方法，其特征在于：水平井(2)和直井(1)均采用大直径钻具钻进，在水平井水平段(3)与直井(1)的对接处设置玻璃钢套管(19)，并对直井(1)对接段进行机械扩径，使该段直径达到0.5m，便于水平井水平段(3)与直井(1)的对接。The method for cooperative drainage of roof layer delamination water and coal measures gas according to claim 1, characterized in that both horizontal wells (2) and vertical wells (1) are drilled with large-diameter drilling tools, and the horizontal section (3 ) FRP casing (19) is set at the joint with the vertical well (1), and the diameter of the joint section of the vertical well (1) is mechanically expanded to make the diameter of this section 0.5m, which is convenient for the horizontal section (3) of the horizontal well and the vertical well (1) )'S docking.
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CN116877196A (en) * 2023-06-08 2023-10-13 山东科技大学 Method for preventing harmful gas in upper goaf from leaking down in close-range coal seam downstream exploitation
CN117027934A (en) * 2023-07-05 2023-11-10 中国矿业大学 A method for laying out aquifer drainage holes for coal mine roof water damage control
CN117027934B (en) * 2023-07-05 2024-06-07 中国矿业大学 Water-bearing layer drainage hole arrangement method for coal mine roof water damage treatment
CN119554095A (en) * 2024-10-21 2025-03-04 中煤科工开采研究院有限公司 An efficient method for solving the problem of large-diameter ground drilling to seal water accumulation in goaf areas
CN119393188A (en) * 2024-11-05 2025-02-07 国家能源集团宁夏煤业有限责任公司 Method, device and system for determining water inflow in mines
CN119777838A (en) * 2025-01-13 2025-04-08 中海石油(中国)有限公司上海分公司 A method, device, equipment and medium for determining water breakthrough time of bottom water gas reservoir
CN120120064A (en) * 2025-04-07 2025-06-10 中煤科工西安研究院(集团)有限公司 Advanced diversion method for preventing and controlling roof composite water hazards in coal mining under close-range coal seams

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