EP2843185A1 - Unterirdisches kohlevergasungsverfahren - Google Patents

Unterirdisches kohlevergasungsverfahren Download PDF

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Publication number
EP2843185A1
EP2843185A1 EP12825017.2A EP12825017A EP2843185A1 EP 2843185 A1 EP2843185 A1 EP 2843185A1 EP 12825017 A EP12825017 A EP 12825017A EP 2843185 A1 EP2843185 A1 EP 2843185A1
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EP
European Patent Office
Prior art keywords
gasification
wells
well
gas
underground coal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP12825017.2A
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English (en)
French (fr)
Inventor
Yong Qin
Wenjiu CHANG
Wei JIAN
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Individual
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Individual
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Publication of EP2843185A1 publication Critical patent/EP2843185A1/de
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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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/17—Interconnecting two or more wells by fracturing or otherwise attacking the formation
    • 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
    • E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
    • 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
    • E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases

Definitions

  • This application involves a gasification method of the underground coal, especially a gasification method of the coal layer with depth of 500 meters to thousands of meters underground.
  • the coal gasification underground is an energy collection manner to directly burn the underground coal with control, generate crude synthetic gas by thermal and chemical actions to the coal, and output the crude synthetic gas to the ground.
  • This is a kind of coal exploitation technique which integrates shaft building, coal mining and coal conversion processes, especially being appropriate to unminable and uneconomical mining coal layers, and to secondary and repeated coal mining.
  • a method of defining and dredging the underground coal gasification channel which includes: measuring horizontal coal layer crustal stress; determining coal fracture development direction according to the measured horizontal coal layer crustal stress; determining coal gasification channel direction according to coal fracture development direction.
  • the defect of above method is that it is needed to install underground gasification channel dredging device mentioned in CN201802362U in order to improve the underground gasification dredging efficiency and to save dredging time. Also, with this method, the gasification reaction area is small and the gasification efficiency is low.
  • CN101586915B it is disclosed a gasifier of pilot scale test gasification of underground coal and its process, which includes gas supply system, gasifier, temperature-pressure-ingredient measurement system, high-temperature video system and gas purification system.
  • the inner side of shell of the gasifier is coated with fire-proof materials.
  • This gasifier with its process is only limited to be used with raw coal mine tunnel other than underground coal layer with depth of 500 meters and even 2000 meters.
  • Alkali metal catalyst is mostly chosen, such as potassium carbonate, sodium carbonate or alkali metal composite catalyst, like potassium carbonate-sodium carbonate binary catalyst, or potassium carbonate-sodium carbonate-lithium carbonate ternary catalyst. Large usage, high cost and recycling equipment requirement cause the problems for above catalysts.
  • this invention offers a method of underground coal gasification, especially a method for the gasification of coal layer with depth of 500 meters or more. This method includes steps of:
  • the gasification working areas could be 0.5 square kilometers or above. Isolation areas with interval of 500 meters or above may be set among gasification working areas.
  • the distance between said injection and gasification wells may be 150 to 500 meters. After coal layer gas field starts to be mined, the original well patterns of injection and gasification wells can be used for underground coal gasification working.
  • gasification channel before the directional drilling, it is used a fracturing device to fracturing coal layer, fluid medium added with catalyst and proppant is injected into the injection and gas recovery wells.
  • the injection pressure needs to be greater than the fracture pressure of stratum to form a large area of fracture cracks, which, together with the gasification channel formed by directional drilling. constitute a gasification channel system.
  • Catalyst and proppant with small particle diameter of e.g. 1-2mm may be injected into above fracture cracks, and catalyst and proppant with big particle diameter of e.g. 10-20mm, can be injected into the gasification channel.
  • the above mentioned catalyst and proppant can be such kind of material as metal mineral particles or preferred iron mineral particles with low cost.
  • This metal mineral particles are of functions of catalyst and propping gasification channel.
  • injection wells can be set up separately as gas injection wells and water injection wells, which is located between the gas injection well and gas recovery well.
  • the above mentioned gasification agent can be air or oxygen.
  • gas injection well, water injection well and gas recovery well can be arranged as square queue sequentially, with gas injection well on edge of the queue.
  • water injection well and gas recovery well are gradually converted to gas injection well and water injection well, with propulsion of burning zone.
  • the above mentioned gas injection well, water injection well and gas recovery well can be arranged as queue of other shape, such as quincuncial piles shape, circle shape and etc.
  • the relatively closed underground coal layer is treated as a whole gasification reaction container, using drilling engineering technique and new type of directional drilling, fracturing reconstruction engineering and so on as coal layer reconstruction and injection-production matching processing technology, to overcome the shortcomings of existing technology with small affected area and low displacement efficiency, and to render characteristics of mining technology of large area, high efficiency and high calorific value, so as to achieve highly efficient comprehensive development of coal resources.
  • Specific advantages of the present invention are as follows:
  • isolation area(2) is set between the gasification working areas (1), injection well(3) and gas recovery well(4) in gasification.
  • the width of the isolation area is over 500m.
  • injection wells(3) can be settled separately as gas injection well(5) and water injection well(6), wherein water injection well(6) is located between gas injection well(5) and gas recovery well(4).
  • Gas injection well(5), water injection well(6) and gas recovery well(4) can be arranged as rectangle, in which gas injection well(5) located at edge, water injection well(6) and gas recovery well(4) are arranged in turn.
  • gas injection well(5), water injection well(6) and gas recovery well(4) gradually are converted to gas injection well(5) and water injection well(6) respectively with propulsion of burning zone.
  • Gas injection well(5), water injection well(6) and gas recovery well(4) can be arranged to other shapes, such as quincuncial piles form, circle and etc.
  • the gasification agent of this invention can be air or oxygen, which can be injected into coal layer through gasification agent injection device consisted of gasification agent injection pipe(7), lubricator(blowout preventer pipe)(8), casing pipe(9), oil pipe(10), packer (11), valve(12) and one-way valve(13) of the gas injection well(5).
  • water is injected to coal burning zone and nearby by the water injection device consisted of casing pipe (14),oil pipe(15), valve(16) and one-way valve(17).
  • the produced gas of this invention is recycled by the recycling device consisted of casing pipe(18), oil pipe(19), valve(20) and one-way valve(21).
  • the ground recycling process includes steps of: producing mixing fluids underground; separating gas, liquid and solid by three-phase separator; and further processing by water treatment and desulfurization and dust removal equipment.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Industrial Gases (AREA)
  • Catalysts (AREA)
  • Processing Of Solid Wastes (AREA)
EP12825017.2A 2011-08-19 2012-09-26 Unterirdisches kohlevergasungsverfahren Withdrawn EP2843185A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2011102558358A CN102287177A (zh) 2011-08-19 2011-08-19 一种地下煤炭气化的方法
PCT/CN2012/082067 WO2013026421A1 (zh) 2011-08-19 2012-09-26 一种地下煤炭气化的方法

Publications (1)

Publication Number Publication Date
EP2843185A1 true EP2843185A1 (de) 2015-03-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12825017.2A Withdrawn EP2843185A1 (de) 2011-08-19 2012-09-26 Unterirdisches kohlevergasungsverfahren

Country Status (4)

Country Link
EP (1) EP2843185A1 (de)
CN (1) CN102287177A (de)
EA (1) EA201400149A1 (de)
WO (1) WO2013026421A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106121618A (zh) * 2016-08-24 2016-11-16 中为(上海)能源技术有限公司 用于煤炭地下气化过程的氧化剂注入设备及其应用
RU2722912C1 (ru) * 2016-08-24 2020-06-04 Чжунвей (Шанхай) Энерджи Текнолоджи Ко. Лтд Устройство газоотводящей скважины для подземной газификации угля и его применение

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CN102287177A (zh) * 2011-08-19 2011-12-21 秦勇 一种地下煤炭气化的方法
GB2549226B (en) * 2012-06-25 2017-12-27 Signa Chemistry Inc A method for removing buildup of asphaltene or waxy deposits in a pipeline with metal silicide
US9435184B2 (en) * 2012-06-28 2016-09-06 Carbon Energy Limited Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification
US9428978B2 (en) * 2012-06-28 2016-08-30 Carbon Energy Limited Method for shortening an injection pipe for underground coal gasification
CN103628855A (zh) * 2013-12-19 2014-03-12 新奥气化采煤有限公司 一种地下气化通道构建方法
CN103883304B (zh) * 2014-04-08 2016-08-24 贵州盘江煤层气开发利用有限责任公司 一种构建气化炉通道的地下煤炭气化方法
CN104018820B (zh) * 2014-06-16 2017-01-04 北京中矿科能煤炭地下气化技术研究中心 一种煤炭地下气化工艺系统
CN104088588B (zh) * 2014-06-24 2016-06-08 新奥气化采煤有限公司 一种煤炭地下气化用套管及煤炭地下气化进、出气孔结构
CN104088617B (zh) * 2014-06-24 2016-08-03 新奥气化采煤有限公司 一种煤炭地下气化进、出气孔结构
CN104533380B (zh) * 2014-12-09 2018-01-16 新奥科技发展有限公司 煤炭地下气化系统
CN108952719B (zh) * 2018-07-09 2020-03-03 山东省煤炭技术服务有限公司 一种综放开采条件下煤层气化复采遗失煤炭的方法
CN111963137B (zh) * 2019-05-20 2022-11-04 中国石油天然气股份有限公司 一种巨厚煤层地下气化方法
CN112012714A (zh) * 2019-05-29 2020-12-01 中国石油天然气股份有限公司 油藏注气开发的井网结构及采油方法
CN112127866B (zh) * 2019-06-25 2022-08-30 中国石油天然气股份有限公司 一种利用煤炭地下气化技术开发深层煤层的工艺
CN110159245A (zh) * 2019-07-05 2019-08-23 山东科技大学 分布式注排气通道窄条带煤炭地下气化炉生产系统及方法
CN112412430B (zh) * 2020-09-18 2022-02-01 西安交通大学 一种煤炭地下原位热解的系统及方法
CN112159153B (zh) * 2020-09-18 2021-12-28 西安交通大学 用于煤炭地下原位热解的支撑剂、制备方法和填充方法
CN112761612A (zh) * 2021-01-07 2021-05-07 中国煤炭地质总局勘查研究总院 利用废弃煤层气井进行煤炭地下气化的方法
CN113803048A (zh) * 2021-08-11 2021-12-17 太原理工大学 一种基于热解的煤炭原位分选开采方法
CN113914847A (zh) * 2021-10-22 2022-01-11 西南石油大学 一种应用压裂技术改善煤炭地下气化气腔发育的方法
CN117307123A (zh) * 2023-11-07 2023-12-29 中国矿业大学(北京) 一种新型地下煤炭气化通道及清除灰质的方法

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CN101113671B (zh) * 2007-09-04 2011-05-11 新奥科技发展有限公司 一种煤炭的地下催化气化工艺
RU2402595C2 (ru) * 2007-11-28 2010-10-27 Общество с ограниченной ответственностью "Научно-производственная фирма "Медведь" Циклический способ подземной газификации угля
RU2396305C1 (ru) * 2008-04-02 2010-08-10 Общество с ограниченной ответственностью "Научно-производственная фирма "Медведь" Способ получения водорода из угольного пласта
CN101315026B (zh) * 2008-07-01 2011-08-31 北京中矿科能煤炭地下气化技术研究中心 一种煤炭地下气化系统及其生产工艺
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CN101586915B (zh) 2009-04-29 2010-12-08 新奥科技发展有限公司 地下煤的气化中试试验气化炉及其工艺方法
CN201802362U (zh) 2010-08-02 2011-04-20 新奥科技发展有限公司 地下气化通道贯通装置
CN102287177A (zh) * 2011-08-19 2011-12-21 秦勇 一种地下煤炭气化的方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106121618A (zh) * 2016-08-24 2016-11-16 中为(上海)能源技术有限公司 用于煤炭地下气化过程的氧化剂注入设备及其应用
RU2722912C1 (ru) * 2016-08-24 2020-06-04 Чжунвей (Шанхай) Энерджи Текнолоджи Ко. Лтд Устройство газоотводящей скважины для подземной газификации угля и его применение

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EA201400149A1 (ru) 2014-06-30
WO2013026421A1 (zh) 2013-02-28
CN102287177A (zh) 2011-12-21

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