WO2016076537A1 - Procédé de production de gaz de lit de charbon - Google Patents

Procédé de production de gaz de lit de charbon Download PDF

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Publication number
WO2016076537A1
WO2016076537A1 PCT/KR2015/010659 KR2015010659W WO2016076537A1 WO 2016076537 A1 WO2016076537 A1 WO 2016076537A1 KR 2015010659 W KR2015010659 W KR 2015010659W WO 2016076537 A1 WO2016076537 A1 WO 2016076537A1
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WO
WIPO (PCT)
Prior art keywords
gas
coal seam
water
coal
coal bed
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PCT/KR2015/010659
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English (en)
Korean (ko)
Inventor
이현찬
주우성
모용기
이지혜
백현선
이종열
이승록
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한국가스공사
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Publication of WO2016076537A1 publication Critical patent/WO2016076537A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D11/00—Solvent extraction
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B43/18—Repressuring or vacuum methods
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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

Definitions

  • the present invention relates to a method for producing coal seam gas, and more particularly, to provide a method for separating CBM (coalbed methane) gas from the waste water generated in the coal seam gas production process.
  • CBM coalbed methane
  • Coal has a function of adsorbing gas due to its fine gap structure, and a large amount of hydrocarbon gas mainly containing methane gas is packed in coal layers in the ground. Since the main component of coal seam gas is methane, it is also commonly referred to as coal seam methane gas or coalbed methane (CBM). Coal seam methane (CBM) is generated during the course of the plant's transformation into coal during the geologic age and is present in the coal seam, either attached to coal molecules or freed in voids.
  • CBM coal seam methane
  • the technology that collects and develops methane gas present in the coal seam and utilizes it as a resource can not only minimize global warming and environmental problems, but also solve the global resource depletion problem. Its importance continues to grow.
  • coal seams suitable for CBM production are coal seams having a very close gap along the cleats or hot poles that occur naturally during carbonization. This is the path through which gas is desorbed and moved from the coal seam during CBM production.
  • CBM production is a process of recovering the groundwater in the coal seam, which depressurizes the gas adsorbed to the coal seam through the process of lowering the pressure, and the desorbed gas is free gas in the form of cracks. Process that is reached and produced.
  • CBM The most important issue in the development of CBM may be the process of desorbing the gas adsorbed on the coal seam by lowering the pressure in the coal seam.
  • This gas production can be carried out with relatively small equipment input compared to the traditional gas development. Cost savings can improve business economics.
  • the gas In the early stages of production, most of the groundwater is produced, but as time passes, the gas is desorbed from the coal seam due to the pressure drop in the coal seam, increasing the gas yield.
  • coal seam gas In this way, a significant amount of water is discharged with the gas and this water is dumped into the reservoir, which contains a significant amount of coal seam gas.
  • An object of the present invention is to provide a more economical coal seam gas production method by separating the coal seam gas contained in the discharge water generated in the coal seam gas production process.
  • the present invention to solve the above technical problem
  • a double-tubular drilling tube in communication with the coal seam and including an inner tube through which water moves and an outer tube surrounding the inner tube;
  • Sending the water discharged from the inner tube to the gas-liquid separator provides a coal seam gas production method comprising the step of separating and recovering the coal seam gas contained in the water.
  • the gas-liquid separator is provided with a demister, the coal seam gas is separated and discharged to the top, the water may be separated and discharged to the bottom.
  • the gas-liquid separator may be that the operation of the gas discharge unit is controlled according to the level of water separated from the gas (level).
  • the gas-liquid separator may be to maintain the process conditions of the water temperature of 30 °C to 60 °C, the operating pressure is 0.3 to 1.5 MPa.
  • the method may further include injecting a stimulus gas into the coal seam before the step of pumping water from the coal seam and detaching the water, and the stimulation gas may be recovered together in the water recovery step. have.
  • the irritant gas may be one or more selected from the group consisting of nitrogen, air, carbon dioxide, or water vapor.
  • the water discharged from the gas-liquid separator may be a gas is substantially removed.
  • the separated gas may include methane, nitrogen, oxygen, carbon dioxide, hydrogen sulfide or mixtures thereof.
  • the production well may be formed with a plurality of vertical and horizontal boreholes.
  • the coal seam gas produced may be compressed by a compressor and then subjected to a purification process.
  • the method according to the present invention is a method for capturing methane gas, sail gas, and natural gas buried in the basement layer, while securing gas as a fuel resource, and separating and reusing gas from the gas-containing process wastewater generated in the production process.
  • 1 is a schematic diagram illustrating the principle of a method of pumping water to produce coal seam gas.
  • FIG. 2 is a schematic diagram of a gas-liquid separator according to one embodiment of the present invention.
  • FIG. 3 is a schematic block diagram of an apparatus according to an embodiment of the present invention.
  • FIG. 4 is a process flow diagram in accordance with one embodiment of the present invention.
  • the gas production in the coal seam is calculated by considering the pressure gradient in the deep coal seam and the pressure gradient across the production facilities such as production pipes, wellheads, and separators, and changes according to the production system and their operating conditions. Done. In addition, in consideration of the inflow pressure and temperature conditions necessary for the production operation plan and the design of the refinery, the optimum operating pressure and temperature conditions for each production facility should be set individually for each mode.
  • a series of production systems from coal seam to refining facilities are represented as collection systems, and proper design and construction are essential core technologies in coal seam gas recovery business.
  • the methane gas recovery process also known as CBM or ECBM, generally extracts gas through a pipeline installed inside the coal seam, and the extracted gas is finally recycled through a collection and purification process.
  • the produced CBM contains nitrogen (N 2 ), oxygen (O 2 ), carbon dioxide (CO 2 ), water vapor (H 2 O), hydrogen sulfide (H 2 S), and the like.
  • N 2 nitrogen
  • O 2 oxygen
  • CO 2 carbon dioxide
  • H 2 O water vapor
  • the produced CBM is a mixture of various gas components can be selectively purified to obtain high efficiency methane gas.
  • by refining according to feed composition by varying the purification process according to the final target material, it can be converted into various energy resource forms.
  • a double-tubular drilling tube in communication with the coal seam and including an inner tube through which water moves and an outer tube surrounding the inner tube;
  • the drilling tube may be in the form of a double tube consisting of an inner tube of a tube shape in which water moves and an outer tube of a casing shape surrounding the outer tube tube.
  • the coal seam refers to a strata (coal layer) made of coal existing underground, and the kind thereof is not particularly limited.
  • the coal contained in the coal seam include bituminous coal, lignite coal, low quality coal, anthracite coal and the like.
  • the present invention as shown in Figure 1, by inserting the drilling tube 10 down the coal seam 2 is fixed CBM gas in the production well (1), the inner tube of the inserted drilling tube 10 ( By desorbing and recovering the water contained in the coal seam with the tube of 11) by the pump 20, the pressure of the coal seam is lowered, whereby the CBM gas (mainly methane gas) fixed to the coal seam can be desorbed.
  • the desorbed hydrocarbon gas may move from the coal seam in a manner that is diffused along the crack network of the coal seam having high permeability of the gas, and the CBM gas 18 is diffused and moved through the outer tube 13 to be recovered from the outlet 25. That's how it works.
  • the groundwater 16 which is separated and recovered from the coal seam may be sent to the gas-liquid separator (not shown) from the outlet 23 to separate residual gas such as CBM contained in the water.
  • the separated gas is mixed with the CBM gas recovered from the coal seam to the outer tube 13 to increase the gas yield, thereby improving production efficiency and process economics.
  • Desorption of CBM gas from the coal seam (2) can be controlled by the partial pressure of hydrocarbon gas rather than the pressure of the whole system. Accordingly, the water contained in the coal seam is desorbed by the pump 20 so that the pressure is reduced, so that the partial pressure of the hydrocarbon fixed to the coal seam is reduced, so that the hydrocarbon can be desorbed from the coal seam.
  • Hydrocarbon desorbed from the coal bed 2 is moved to the diffusion according to the difference in gas concentration along the crack network having a relatively high permeability among the cracks generated in the coal bed 2, and diffuses to the outer tube 13 of the drilling tube 10. It can be moved and recovered from the production wells.
  • the amount of methane (CBM) contained in the coal seam may vary depending on the degree of carbonization of the coal seam and the investment depth, and the higher the carbonization degree and the deeper the coal seam, the higher the gas content.
  • Desorption of the methane adsorbed to the coal seam is caused by a decrease in pressure of the coal seam, and it may be optimal to reduce the pressure to 15 psia or less for the desorption of the adsorbed methane.
  • a process of applying an artificial stimulus may be further performed in addition to the pressure lowering process by groundwater pumping for gas production of the coal well production.
  • the stimulation process may be a pressure application, a proppant insertion, a composite thermode opening method, etc. to increase the permeability of the coal seam, and accordingly, the drilling pipe for producing CBM gas has its location, spacing between the drilling pipes, and drilling Various conditions can vary, including protection against tube damage.
  • Preferred stimulation process according to the present invention can be carried out a pressure application method according to the injection of stimulation gas.
  • the stimulating gas is an inert gas which is very well adsorbed to or does not react with coal at the conditions of use, for example, nitrogen, helium, argon, air and water vapor or a mixture thereof may be selected. From an economic point of view, air containing 80% nitrogen may be more preferred.
  • the irritant gas is injected into the coal seam and recovered together with water or hydrocarbons during the desorption and recovery of water, thereby improving the pressure of hydrocarbons fixed in the coal seam and improving the permeability of the cracking network and smoothing the diffusion of the hydrocarbon gas. You can do it smoothly.
  • the irritant gas may be included in the hydrocarbon gas recovered and discharged.
  • a plurality of boreholes may be formed at a predetermined depth of the coal seam in one production well, and the borehole may be formed horizontally in the coal seam.
  • the multiple boreholes can increase the recovery of higher CBM gas.
  • This effect can result in fracture porosity due to the fracture of the coal seam, which can be created by the coal seam-specific cleat, which is to be formed of two cleats that are nearly perpendicular to each other.
  • the cleats may be divided into face cleats having good coal seam extension and butt cleats that vertically connect the face cleats.
  • FIG. 2 schematically illustrates a gas-liquid separator that may be used in one embodiment of the present invention.
  • the gas-liquid separator is connected to the outlet 23 of the inner tube 11 of the drilling tube shown in FIG.
  • the groundwater recovered to the inner tube 11 of the drilling pipe is sent to the gas separator connected to the outlet 23, the gas remaining in the groundwater can be separated, in the gas separator
  • the recovered residual gas may be recovered and used together with the CBM gas discharged from the coal seam.
  • the gas-liquid separator may be used as long as it is a device capable of separating the gas phase and the liquid phase.
  • the gas liquid separator may be a device that separates gas contained in water by separating natural gas from the upper part and water from the lower part.
  • the gas-liquid separator is provided with a demister (35), it is possible to separate the liquid phase and the gaseous phase from the flying droplets.
  • the water discharged from the inner tube 11 of the drilling tube is introduced into the droplet injector 31 of the gas-liquid separator equipped with the demister in the form of droplets, the sprayed droplet is the demister 35 Colliding with, causing organized wires and inertia collisions, the collided particles agglomerate with each other and grow into larger droplets, increasing in volume.
  • the droplet 39 having an increased volume may be separated by gravity to separate the gas phase and the liquid phase.
  • the gas-liquid separator may be controlled to operate the gas discharge unit 33 in accordance with the water level of the water separated and recovered from the gas (37).
  • the gas-liquid separator may further include a chamber connected to the outlet 40 through which the water from which the gas 37 has been removed is discharged, and a level switch (not shown) for measuring the level of the water discharged in the chamber.
  • the level switch is linked to the gas discharge unit 33 for moving and discharging the gas separated from the gas-liquid separator to control the operation of the gas discharge unit 33 in accordance with the water level measured by the level switch. Can be. That is, when the level of water in the chamber measured by the level switch is below a certain level, the control device may operate the gas discharge unit 33 to discharge the gas accumulated in the upper side of the chamber to the outside. .
  • the gas-liquid separator may be to maintain the process conditions of the water temperature of 30 °C to 60 °C, preferably 30 to 50 °C, the operating pressure is 0.3 to 1.5 MPa, preferably 0.5 to 0.9 MPa have.
  • a filter may be mounted to the outlet portion 40 of the water from which the gas is removed from the gas-liquid separator, and the water may be discharged out through the filter.
  • the water may contain various salts such as heavy metals included in the coal seam in the process of extracting a large amount of groundwater in the production of CBM gas.
  • the heavy metal salts may include, for example, chloride ions, heavy metal salts such as chromium, manganese, zinc, molybdenum, and the like as impurities. If the material such as heavy metal salts contained in the above groundwater is discharged as it may be a factor that can cause environmental problems.
  • the filtering process may be performed before the gas-liquid separator or after the gas-liquid separator, and the heavy metal salts as impurities obtained in the filtering process may be used as natural resources.
  • the filter may be a filtration filter packed with ceramic particles, but is not limited thereto.
  • FIG. 3 is a flowchart according to an embodiment of the present invention.
  • a plurality of gas-liquid separators may be provided.
  • the gas discharged from the outer tube of the borehole and the gas discharged from the first and second gas-liquid separators V-301 and V-302 may be compressed in the compressor C-401 and stored in the buffer tank.
  • the CBM gas stored in the gas may be a mixed gas further comprising nitrogen, oxygen, carbon dioxide, hydrogen sulfide, or a mixture thereof in addition to methane gas.
  • the CBM gas stored in the buffer tank may produce an optimized CBM gas through a purification device.
  • the method according to the present invention makes it possible to secure fuel resources by capturing methane gas, sail gas and natural gas buried in the basement layer, and also separating the gas from process wastewater containing gas generated in the production process. It is expected to be able to collect gas more economically and efficiently by providing a method of reusing it, and at the same time, it is possible to effectively solve the environmental problems caused by waste water, so that it can be effectively applied to actual processes.

Abstract

La présente invention concerne un procédé de production d'un gaz de lit de charbon, comprenant : une étape d'identification de l'emplacement d'un lit de charbon comportant du gaz fixé au charbon ; une étape d'installation d'au moins un puits de production qui communique avec le lit de charbon ; une étape d'installation, dans le puits de production, d'un tuyau de forage de type à double tuyau qui communique avec le lit de charbon et est constitué d'un tuyau interne par l'intermédiaire duquel l'eau se déplace et un tuyau externe entourant le tuyau interne ; une étape de retrait d'eau contenue dans le lit de charbon par un raccordement d'une pompe au tuyau interne du tuyau de forage, et de décharge de l'eau par l'intermédiaire du tuyau interne ; une étape consistant à laisser le gaz de charbon être désorbé du lit de charbon en raison d'une chute de pression causée par le retrait de l'eau du lit de charbon de manière à être diffusé et se déplacer, de manière à décharger le gaz de lit de charbon vers le tuyau externe ; et une étape de transfert de l'eau déchargée depuis le tuyau interne vers un séparateur vapeur-liquide de manière à séparer et récupérer le gaz de charbon contenu dans l'eau. La présente invention peut collecter du gaz plus économiquement efficacement, et peut simultanément résoudre les problèmes d'environnement causés par les eaux usées et donc, la présente invention peut être efficacement appliquée à des processus réels.
PCT/KR2015/010659 2014-11-10 2015-10-08 Procédé de production de gaz de lit de charbon WO2016076537A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2014-0155670 2014-11-10
KR1020140155670A KR20160055628A (ko) 2014-11-10 2014-11-10 탄층 가스 생산 방법

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019205577A1 (fr) * 2018-04-28 2019-10-31 中国矿业大学 Système de test de simulation pour extraction de gaz à partir d'une veine de charbon déformée de manière tectonique in situ par dépressurisation d'une cavité de puits horizontal
WO2019205578A1 (fr) * 2018-04-28 2019-10-31 中国矿业大学 Système de test de simulation pour extraction de gaz à partir d'une veine de charbon déformée de manière tectonique in situ par dépressurisation d'une cavité de puits horizontal

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117610890B (zh) * 2024-01-19 2024-04-30 天津美腾科技股份有限公司 一种选煤厂参数动态计算方法、装置、设备及介质

Citations (5)

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US5462116A (en) * 1994-10-26 1995-10-31 Carroll; Walter D. Method of producing methane gas from a coal seam
JP2003214082A (ja) * 2002-01-18 2003-07-30 Tobishima Corp ガスハイドレート掘採方法とその装置
US6745815B1 (en) * 2000-03-15 2004-06-08 Corley P. Senyard, Sr. Method and apparatus for producing an oil, water, and/or gas well
JP2005213824A (ja) * 2004-01-28 2005-08-11 Univ Akita メタンハイドレート堆積層からの天然ガス生産設備と発電設備を具備する統合設備
KR20120139922A (ko) * 2011-06-20 2012-12-28 한국에너지기술연구원 다공판 배플을 이용한 기액분리장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5462116A (en) * 1994-10-26 1995-10-31 Carroll; Walter D. Method of producing methane gas from a coal seam
US6745815B1 (en) * 2000-03-15 2004-06-08 Corley P. Senyard, Sr. Method and apparatus for producing an oil, water, and/or gas well
JP2003214082A (ja) * 2002-01-18 2003-07-30 Tobishima Corp ガスハイドレート掘採方法とその装置
JP2005213824A (ja) * 2004-01-28 2005-08-11 Univ Akita メタンハイドレート堆積層からの天然ガス生産設備と発電設備を具備する統合設備
KR20120139922A (ko) * 2011-06-20 2012-12-28 한국에너지기술연구원 다공판 배플을 이용한 기액분리장치

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019205577A1 (fr) * 2018-04-28 2019-10-31 中国矿业大学 Système de test de simulation pour extraction de gaz à partir d'une veine de charbon déformée de manière tectonique in situ par dépressurisation d'une cavité de puits horizontal
WO2019205578A1 (fr) * 2018-04-28 2019-10-31 中国矿业大学 Système de test de simulation pour extraction de gaz à partir d'une veine de charbon déformée de manière tectonique in situ par dépressurisation d'une cavité de puits horizontal
AU2018420472B2 (en) * 2018-04-28 2021-04-01 Anhui University of Science and Technology Simulation test method for gas extraction from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity
US10995572B2 (en) 2018-04-28 2021-05-04 China University Of Mining And Technology Simulation test method for gas extraction from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity
US11035228B2 (en) 2018-04-28 2021-06-15 China University Of Mining And Technology Simulation test system for gas extraction from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity

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