WO2009039776A1 - Système et procédé d'exploitation pour déplacer un gaz de couche de charbon grâce à un gaz mélangé à travers un passage de drainage de pompage qui se trouve sous un puits - Google Patents

Système et procédé d'exploitation pour déplacer un gaz de couche de charbon grâce à un gaz mélangé à travers un passage de drainage de pompage qui se trouve sous un puits Download PDF

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Publication number
WO2009039776A1
WO2009039776A1 PCT/CN2008/072414 CN2008072414W WO2009039776A1 WO 2009039776 A1 WO2009039776 A1 WO 2009039776A1 CN 2008072414 W CN2008072414 W CN 2008072414W WO 2009039776 A1 WO2009039776 A1 WO 2009039776A1
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WIPO (PCT)
Prior art keywords
mixed gas
gas
methane
drainage
mining
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PCT/CN2008/072414
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English (en)
Chinese (zh)
Inventor
Xiaochun Li
Ning Wei
Original Assignee
Institute Of Rock And Soil Mechanice, Chinese Academy Of Sciences
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Application filed by Institute Of Rock And Soil Mechanice, Chinese Academy Of Sciences filed Critical Institute Of Rock And Soil Mechanice, Chinese Academy Of Sciences
Publication of WO2009039776A1 publication Critical patent/WO2009039776A1/fr

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Classifications

    • 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
    • E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
    • E21B43/168—Injecting a gaseous medium
    • 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

Definitions

  • the invention relates to a coalbed methane mining technology, in particular to a mixed gas displacement coalbed methane mining system and a method thereof. Background technique
  • Coalbed methane is an unconventional natural gas, commonly known as gas, a mixed gas composed of gases such as CH 4 , C0 2 , 0 2 , N 2 , C0, H 2 S, N0 X, etc.
  • the main component is CH 4 (methane), accounting for 80 ⁇ 90%. It is a natural gas that is generated in the coal-forming process and is present in the coal seam and surrounding rock layers in a sorption and free state.
  • the current CBM mining system uses vertical drilling on the ground to enter the coal seam, and through the ground drilling to achieve coalbed methane extraction or gas injection and water flooding mining; the disadvantage of this structure is that it is generally suitable for coalbed methane mining in unmined coal seams. It can't be carried out simultaneously with underground coal mining; at the same time, several kilometers of drilling can only produce coalbed methane with several layers of coal. The drilling cost is very high, which reduces the economics of coalbed methane mining.
  • the underground coalbed methane mining is mainly based on horizontal well extraction, and the coalbed methane is extracted by vacuum; the recovery rate of coalbed methane is low, and the depth of horizontal holes is limited. The influence range of extraction is limited, and it is easy to be in the middle of the mining area.
  • a blank belt for coalbed methane production is formed, which wastes a lot of coalbed methane resources.
  • the invention provides a mixed gas displacement coalbed methane mining system and a method thereof for underground drainage and drainage.
  • the system does not require drilling, and coalbed methane mining can be achieved by drilling through the roadway, which can save a lot of drilling costs.
  • This method is not only conducive to improving the recovery rate, recovery rate and recovery range of coalbed methane, but also storing waste and greenhouse gases in the non-minable coal seam.
  • the mining system includes coal seams, machine lanes, wind tunnels, pumping lanes and drainage holes;
  • a plurality of injection holes communicating with the coal seam are disposed in the pumping lane.
  • a conventional roadway drainage system is composed of coal seams, machine lanes, wind tunnels, drainage roadways and drainage holes; a downhole drainage according to the present invention is formed by providing injection holes.
  • the mixed gas in the lane drives the coalbed methane mining system.
  • the mining method is based on the system, including the following steps:
  • the mixed gas comprising at least one or more of N 2 , 3 ⁇ 4,
  • the gas containing coalbed methane is obtained in the pumping hole by using the pumping equipment until the obtained methane concentration is lower than the economic exploitation concentration and the safe concentration.
  • N 2 mixed gas and / or 3 ⁇ 4 and / or H e and N0 2, when N 2 0, S0 3, 0 2, water vapor from any one or more of mixing, when the mixed gas comprises oxygen, the oxygen
  • the volume is not more than 21% of the total volume.
  • the mixed gas comprises at least N 2 and/or 3 ⁇ 4 and/or with any one or more of the following gases: H 2 S, S0 2 , C0
  • A is the ratio of gas to total volume
  • 3 ⁇ 4 is the displacement ratio of gas to methane; when the volume of methane is 1, the substitution rates of various gases are as follows: S0 2 : 4-6; H 2 S: 6-8; C0 2 : 1.5 to 3; N 2 : 0.1 ⁇ 0.5; H 2 : 0.05 to 0.2; He: 0 to 0.1; N 2 0: 5-7; NO: 6 to 8; N0 2 : 5 to 8; S0 3 : 8 to 12.
  • the invention utilizes the existing roadway in the coal seam and uses the mixed gas to drive the coalbed methane technology, and has the following effects:
  • the existing roadway in the coal seam reduces the construction cost of displacement mining; the displacement mining of coalbed methane can be synchronized with the coal mining process, has little impact on coal mining production, and eliminates the blank zone of coalbed methane mining in the middle of the mining area; It utilizes most of the coalbed methane resources in the mining area, reduces the concentration of coalbed methane (CBM), reduces the risk of gas outburst and coal seam outburst, and improves the safety environment of the entire coal seam mining. At the same time, it recovers coalbed methane and reduces methane greenhouse. Gas emissions.
  • CBM concentration of coalbed methane
  • the mixed gas in the present invention and having a driving effect of substitutions: injecting the mixed gas is maintained higher than the suction pressure gradient alone, serve to increase the fluid flow rate, CBM promote convection, diffusion, displacement and CH 4 flow carrying Production well.
  • the present invention exerts an effect of increasing the permeability of the weak replacement gas.
  • the weak replacement gas displaces methane, the coal seam shrinks and has an effect of increasing permeability.
  • Weakly displaced gases eg, N 2 , H 2 , H e
  • Weakly displaced gases can increase the coal seam permeability coefficient by more than one order of magnitude, which is important for the development of coalbed methane in low permeability coal seams.
  • the mixed gas in the present invention also has a transformation effect: the mixed gas injection maintains a high pore pressure, increases porosity and pore connectivity, and is advantageous for improving coal seam permeability.
  • Different mixed gases can cause the coal seam to expand or contract (as opposed to adsorbing methane), which can reduce or increase the permeability of the coal seam and improve the injectability of the coal seam.
  • mixed gas it can be injected into the coal seam according to different needs to be a strong replacement gas with methane (such as: H 2 S, S0 2 , N0 2 , N0, N 2 0, S0 3 , C0 2 ) or weakly substituted gas (The N 2 , H 2 ) dominated mixed gas is used to displace coalbed methane and drive it away to the production well.
  • a strong replacement gas with methane such as: H 2 S, S0 2 , N0 2 , N0, N 2 0, S0 3 , C0 2
  • the N 2 , H 2 ) dominated mixed gas is used to displace coalbed methane and drive it away to the production well.
  • the mixed gas When the mixed gas contains a strong replacement gas, the mixed gas can have a strong competitive adsorption energy. Force.
  • the adsorption capacity of the coal for the strong displacement gases S0 2 , H 2 S, C0 2 , N0 X , S0 3 , N 2 0, N0, N0 2 is stronger than that of CH 4 , and the injection of a strong replacement gas promotes the desorption of CH 4 .
  • the injected S0 2 , H 2 S, and C0 2 reduce the partial pressure of CH 4 in the coal seam, and also have a certain effect of promoting the desorption of CH 4 , and accelerate the exploitation of coalbed methane.
  • the mixed gas can be directly added to the regulating component gas by industrial waste gas, air, waste gas or a mixed gas thereof, and the purification concentration is required to be low or not purified, the gas source cost is greatly reduced, and the total cost of the mixed gas to drive the coalbed methane is reduced; Waste gas is stored in non-minable coal seams to reduce atmospheric pollution.
  • the system utilizes the underground coal seam mining structure and facilities to save engineering costs; it has good coordination with underground coal mining, and can be alternated with underground coal mining, releasing coalbed methane in advance, reducing gas disasters and increasing coal mining speed. Moreover, the mining system does not require drilling, and coalbed methane mining can be realized only by drilling the roadway, which can save a lot of drilling costs.
  • the method can regulate the permeability of the coal seam by the gas component, and can improve the controllability of the coalbed methane displacement mining.
  • the implementation of this technology for non-minable coal seams can sequester part of the waste gas, such as: N0x, S0x, C0 2 and other waste gases in the coal seam.
  • the invention can improve the recovery rate and single output of coalbed methane; for the recoverable coal seam, the mixed gas is finally released, but the CH 4 is extracted in advance, the CH 4 emission is reduced, and the emission reduction effect is remarkable; Reduce the risk of gas outburst; apply to low permeability recoverable coal seams.
  • Figure 1 is a front view of the structure of the mining system
  • Figure 2 is a cross-sectional view taken along line A-A of Figure 1;
  • Figure 3 is a graph of cumulative methane production over time.
  • the injection hole 1 and the pumping hole 6 are formed; the injection hole 1 formed by the pumping lane 4 is generally located at the middle position of the coal seam 5 mining area, and Coal seams can be either crossed or skewed.
  • Mixed gas displacement is used to extract coalbed methane through the already formed injection holes 1 and evacuation holes 6, so that the displacement process can be combined with the coal mining process to minimize the impact on the coal mining process.
  • the ratio is calculated as follows:
  • 3 ⁇ 4 is the substitution rate of gas with respect to methane.
  • S0 2 : H 2 S : C0 2 : CH 4 : N 2 : H 2 5: 7: 2: 1: 0. 2: 0 1; is the average replacement rate of the mixed gas, when the parameter is low, mainly to reduce the partial pressure of methane to promote desorption; when the parameter is high, mainly the competitive adsorption promotes the desorption of methane; the specific values in the range need to be adjusted according to different purposes.
  • the composition of the mixed gas can also be dynamically adjusted according to the pressure and temperature changes of the coal seam, for example: starting to inject a larger gas, according to the injection property of the coal seam, the adjusted composition (ie: the ratio of various gases), using a small value Mixed gas displacement can improve the injection rate, and the replacement gas can be used to increase the replacement speed.
  • the mixed gas with different replacement rates can be alternately injected to drive the coalbed methane; or the average and smooth mixed gas can be used to drive the coalbed methane. 0 2
  • the main role is to destroy the surface of the coal matrix, increase the temperature of the coal seam, and promote the desorption of methane.
  • the control standard is to prevent the spontaneous combustion of the coal seam and the excessive oxidation of methane.
  • the control standard is 0 2 volume to 0% to 21% of the total volume of the mixed gas, and the replacement ratio of oxygen is considered to be 0 in the average displacement ratio.
  • the proportion of various gas components in the injection process can be changed, and the replacement rate of the entire mixed gas can also be fluctuated.
  • the weak replacement gas and the strong replacement gas can be alternately injected to drive the coalbed methane.
  • High pressure injection equipment including high pressure gas injection pumps, gas cylinders, high pressure vessels, etc.
  • Coalbed methane or a mixed gas containing coalbed methane is obtained in the extraction hole (6), and other gas components after methane separation can be recycled as a component in the mixed gas.
  • the mixed gas displacement coalbed methane test in the underground drainage and drainage road starts to be pumped separately (6), and the coalbed methane is added to a certain amount, and the increase is little; after the displacement method, the coalbed methane is used.
  • the cumulative methane production has increased significantly, which proves that the mixed gas displacement coalbed methane test in the underground drainage well can indeed increase the production and recovery of coalbed methane.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

La présente invention concerne un système et un procédé d'exploitation pour déplacer un gaz de couche de charbon grâce à un gaz mélangé à travers un passage de drainage de pompage qui se trouve sous un puits. Le système d'exploitation comprend une couche de charbon (5), un passage de machine (2), un passage d'air (3), un passage de drainage de pompage (4), et des trous de drainage de pompage (6). Le passage de machine (2) et le passage d'air (3) se trouvent autour d'un plan de la couche de charbon (5). Le passage de drainage de pompage (4) se trouve sur le côté supérieur ou inférieur de la couche de charbon (5). Certains trous de drainage de pompage (6) sont positionnés dans la couche de charbon (5). Certains trous d'injection (1) sont positionnés dans le passage de drainage de pompage (4) qui est raccordé à la couche de charbon (5). Le procédé d'exploitation comprend les étapes suivantes qui consistent : à permettre à deux gaz ou plus de former un gaz mélangé qui comprend au moins un ou plusieurs parmi de l'azote, de l'hydrogène et de l'hélium ; à utiliser des équipements d'injection à haute pression pour injecter le gaz mélangé dans la couche de charbon (5) par l'intermédiaire des trous d'injection (1) ; à utiliser des équipements de pompage pour obtenir du gaz qui contient un gaz de couche de charbon à partir du trou de drainage de pompage (6). Il est indiqué que la présente invention est pour un champ d'exploitation de gaz de couche de charbon de faible perméation et exploitable.
PCT/CN2008/072414 2007-09-19 2008-09-18 Système et procédé d'exploitation pour déplacer un gaz de couche de charbon grâce à un gaz mélangé à travers un passage de drainage de pompage qui se trouve sous un puits WO2009039776A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA2007100532696A CN101122217A (zh) 2007-09-19 2007-09-19 井下抽排巷混合气体驱替煤层气开采系统及其方法
CN200710053269.6 2007-09-19

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CN102207004A (zh) * 2010-03-30 2011-10-05 淮南矿业(集团)有限责任公司 采煤工作面瓦斯治理的方法
CN104594866A (zh) * 2014-10-31 2015-05-06 河南神华能源工程有限公司 一种基于低渗煤层气相压裂瓦斯快速抽采技术的新方法
CN110821544A (zh) * 2018-08-14 2020-02-21 柴乔森 矿井内自点火煤孔煤层气化炉式采区
CN111830231A (zh) * 2020-07-21 2020-10-27 安徽理工大学 一种煤水气混合物的高效分离、回收处理与循环利用试验方法
WO2022193802A1 (fr) * 2021-03-18 2022-09-22 柴兆喜 Puits de forage pour extraction de gaz pur

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CN101122217A (zh) * 2007-09-19 2008-02-13 中国科学院武汉岩土力学研究所 井下抽排巷混合气体驱替煤层气开采系统及其方法
CN101503957B (zh) * 2009-01-23 2012-09-26 赵阳升 井上下联合注热抽采煤层气的方法
CN102720473A (zh) * 2011-03-31 2012-10-10 中联煤层气有限责任公司 开采煤层气的方法
CN102587958A (zh) * 2012-03-09 2012-07-18 山西蓝焰煤层气工程研究有限责任公司 一种开采煤层气的方法
CN102877819B (zh) * 2012-10-11 2015-04-22 河南理工大学 煤层气井循环注二氧化碳系统
CN104234740B (zh) * 2014-09-03 2016-04-13 太原理工大学 一种低中压空气驱替高压煤层瓦斯系统及其方法
CN106121604B (zh) * 2016-06-27 2018-08-17 中国矿业大学 一种利用co2和改性水驱除煤层瓦斯及残余气体的方法
CN106202748B (zh) * 2016-07-14 2019-03-22 中国海洋石油集团有限公司 一种基于渗透率和井距的煤层气采收率预测方法
CN112483163B (zh) * 2020-11-26 2023-01-31 河南工程学院 构造煤矿区煤层气地面抽采单向递减控压排采方法
CN113389597B (zh) * 2021-07-29 2022-06-28 安徽理工大学 一种资源共伴生矿区煤矸石综合利用系统及应用方法
CN114441407A (zh) * 2022-01-14 2022-05-06 合肥综合性国家科学中心能源研究院(安徽省能源实验室) 低渗煤岩co2驱替过程动态可视化模拟试验系统与方法
CN114778738B (zh) * 2022-04-29 2023-11-07 辽宁工程技术大学 一种混合气体置换驱替煤层中瓦斯实验装置及方法

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102207004A (zh) * 2010-03-30 2011-10-05 淮南矿业(集团)有限责任公司 采煤工作面瓦斯治理的方法
CN104594866A (zh) * 2014-10-31 2015-05-06 河南神华能源工程有限公司 一种基于低渗煤层气相压裂瓦斯快速抽采技术的新方法
CN110821544A (zh) * 2018-08-14 2020-02-21 柴乔森 矿井内自点火煤孔煤层气化炉式采区
CN111830231A (zh) * 2020-07-21 2020-10-27 安徽理工大学 一种煤水气混合物的高效分离、回收处理与循环利用试验方法
WO2022193802A1 (fr) * 2021-03-18 2022-09-22 柴兆喜 Puits de forage pour extraction de gaz pur

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