WO2011000022A1 - A method of extracting methane from a coal deposit - Google Patents
A method of extracting methane from a coal deposit Download PDFInfo
- Publication number
- WO2011000022A1 WO2011000022A1 PCT/AU2010/000310 AU2010000310W WO2011000022A1 WO 2011000022 A1 WO2011000022 A1 WO 2011000022A1 AU 2010000310 W AU2010000310 W AU 2010000310W WO 2011000022 A1 WO2011000022 A1 WO 2011000022A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coal
- methane
- deposit
- extracting
- seam
- Prior art date
Links
Classifications
-
- 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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/582—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of bacteria
-
- 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
- E21B43/006—Production of coal-bed methane
Definitions
- the present invention relates broadly to a method of extracting methane from a coal deposit.
- a method of extracting methane from a coal deposit comprising the steps of:
- the method comprises sequential steps of depositing the pre-treatment materials and the nutrients into the in-seam boreholes. More preferably the method also comprises the step of depositing the microbial matter following the sequential deposition of the pre-treatment materials and the nutrients. Preferably the method also comprises the step of promoting the passage of the pre- treatment materials, nutrients or microbial matter across the coal seam between a pair of adjacent in-seam boreholes. More preferably this step of promoting the passage of this injected material is effected by reducing the pressure in one of the pair of said in-seam boreholes. Preferably the steps of drilling vertically and drilling directionally are performed
- the step of extracting the biogenically enhanced methane involves pumping from at least one of the vertical wells to provide a pressure gradient for diffusion of the methane from the adjacent coal seams. More preferably or additionally the extraction step also involves sequestering CO 2 to the coal seams to aid development of the biogenically enhanced methane. Even more preferably the extraction step involves a preparatory step of dewatering the coal deposit by pumping water from the deposit.
- the microbial matter includes methanogens such as bacteria and archaea.
- the pre-treatment materials include caustic materials.
- the coal deposit includes lignite, peat or sub-bituminous coal and oil shale.
- Figure 1 is a schematic sectional view of one embodiment of a preferred methodology for extracting methane from a coal deposit
- Figure 2 is a schematic plan view of another embodiment of extracting methane from a coal deposit.
- a preferred methodology of extracting methane from a coal deposit involves the following general steps: 1. drilling generally vertically into a CBM deposit 10 to form a vertical well 12;
- the coal deposit 10 is a lower rank coal such as a lignite deposit.
- the invention may extend to other coal deposits such as a coal bed methane deposit.
- the coal deposit may also extend to peat or sub-bituminous coals and oil shale.
- the deposition steps in step 3 are generally performed separately and sequentially.
- the pre-treatment materials include caustic materials.
- the microbial matter includes methanogens such as methanogenic bacteria and archaea which provides enhanced biogenic treatment in the lignite deposit 10.
- the two in-seam boreholes 16 and 18 are positioned relative to one another to exploit the natural permeability anisotropy of the lignite deposit 10.
- the boreholes 16/18 of Figure 1 are thus lined up vertically to maximise the methanogenic process using natural vertical pathways (such a joints depicted by arrows 24).
- the boreholes 16/18 are lined up horizontally to maximise production along natural horizontal pathways (bedding planes depicted by arrows 26).
- the same reference numerals have been used to designate
- the deposition of the pre-treatment materials and optionally the methanogenic bacteria into the borehole 16 is effected as a pre-treatment and injection steps via the vertical well 12.
- the borehole 16 thus functions as a pre-treatment and injection well.
- the injection of these materials into the borehole 16 may involve a gravity feed system alone or a combination of gravity and pumping from the vertical well 12 head.
- the injected materials then travel directionally across the coal seam such as 14 via gravity to the other adjacent in-seam borehole 18.
- the materials migrate directionally with the assistance of gravity in the general direction of maximum permeability of the lignite deposit 10. It will be appreciated that the lignite deposit 10 and associated coal seam 14 of Figure 1 has maximum vertical permeability whereas the coal seam depicted in
- Figure 2 has "seam dip" with maximum horizontal permeability.
- drilling of the pre-treatment and injection borehole 16 and the capture borehole 18 is provided in order to maximise the natural permeability and anisotropy of the lignite deposit 10.
- the borehole 16 provides the pre-treatment and injection pathway and the other borehole 18 provides the capture pathway.
- the migration of the injected materials between the pair of boreholes 16 and 18 is promoted by reducing the pressure in the capture borehole 18. This pressure reduction is most typically effected by using a vacuum pump installed at the head of the vertical well 12.
- biogenically enhanced methane is extracted by continued pumping to create the required pressure gradient for diffusion of methane from the coal seam such as 14 into the capture borehole 18 and the vertical well 12.
- This extraction of biogenically enhanced methane may also involve pumping or sequestering carbon dioxide to the coal seam such as 14 to aid development of the biogenically enhanced methane.
- the methodology provides an effective way of recovering biogenically enhanced methane from lignite and other coal deposits using the natural permeability anisotropy of the deposit; 2. effective methane extraction can be provided by combining directional in-seam drilling with biogenic enhancement of the coal deposit;
- the process may utilise pre-existing vertical wells which are effective coupled by directional in-seam drilling of sub-parallel directional boreholes;
- the process is relatively fast, compared to natural bio enhancement, by injecting for example methanogens and nutrients into coal seams to promote this otherwise natural reaction to occur in real time;
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2010268745A AU2010268745A1 (en) | 2009-07-01 | 2010-03-18 | A method of extracting methane from a coal deposit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2009903082 | 2009-07-01 | ||
AU2009903082A AU2009903082A0 (en) | 2009-07-01 | A method of extracting methane from a coal deposit |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011000022A1 true WO2011000022A1 (en) | 2011-01-06 |
Family
ID=43410347
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2010/000310 WO2011000022A1 (en) | 2009-07-01 | 2010-03-18 | A method of extracting methane from a coal deposit |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU2010268745A1 (en) |
WO (1) | WO2011000022A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011089151A3 (en) * | 2010-01-19 | 2011-11-24 | Ecole Normale Superieure De Lyon | Method for producing methane gas |
CN102434185A (en) * | 2011-09-23 | 2012-05-02 | 河南中煤矿业科技发展有限公司 | Coal mine gas fast solvent and application method thereof |
CN103161440A (en) * | 2013-02-27 | 2013-06-19 | 中联煤层气国家工程研究中心有限责任公司 | Single-well coalbed methane horizontal well system and finishing method thereof |
CN107330220A (en) * | 2017-07-20 | 2017-11-07 | 中国矿业大学(北京) | Consider this coal seam concordant gas drilling design method of permeability anisotropy |
WO2018201714A1 (en) * | 2017-05-02 | 2018-11-08 | 中国矿业大学 | Accurate extraction method for coal mine gas |
CN112127868A (en) * | 2020-09-27 | 2020-12-25 | 中国地质大学(北京) | Test device for simulating underground coal gasification and oil shale co-production and test method thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113669045A (en) * | 2021-09-29 | 2021-11-19 | 中国石油大学(北京) | Method and processor for in-situ conversion between same-well sections of coal bed horizontal well |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4544037A (en) * | 1984-02-21 | 1985-10-01 | In Situ Technology, Inc. | Initiating production of methane from wet coal beds |
US6543535B2 (en) * | 2000-03-15 | 2003-04-08 | Exxonmobil Upstream Research Company | Process for stimulating microbial activity in a hydrocarbon-bearing, subterranean formation |
US20040033557A1 (en) * | 2000-10-26 | 2004-02-19 | Scott Andrew R. | Method of generating and recovering gas from subsurface formations of coal, carbonaceous shale and organic-rich shales |
US6817411B2 (en) * | 1998-06-23 | 2004-11-16 | The University Of Wyoming Research Corporation | System for displacement of water in coalbed gas reservoirs |
US20060223153A1 (en) * | 2005-04-05 | 2006-10-05 | Luca Technologies, Llc | Generation of materials with enhanced hydrogen content from anaerobic microbial consortia |
WO2007022122A2 (en) * | 2005-08-12 | 2007-02-22 | University Of Wyoming Research Corporation D/B/A Western Research Institute | Biogenic methane production enhancement systems |
US20080060805A1 (en) * | 1998-11-20 | 2008-03-13 | Cdx Gas, Llc | Method and system for accessing subterranean deposits from the surface and tools therefor |
US7360595B2 (en) * | 2002-05-08 | 2008-04-22 | Cdx Gas, Llc | Method and system for underground treatment of materials |
-
2010
- 2010-03-18 AU AU2010268745A patent/AU2010268745A1/en not_active Abandoned
- 2010-03-18 WO PCT/AU2010/000310 patent/WO2011000022A1/en active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4544037A (en) * | 1984-02-21 | 1985-10-01 | In Situ Technology, Inc. | Initiating production of methane from wet coal beds |
US6817411B2 (en) * | 1998-06-23 | 2004-11-16 | The University Of Wyoming Research Corporation | System for displacement of water in coalbed gas reservoirs |
US20080060805A1 (en) * | 1998-11-20 | 2008-03-13 | Cdx Gas, Llc | Method and system for accessing subterranean deposits from the surface and tools therefor |
US6543535B2 (en) * | 2000-03-15 | 2003-04-08 | Exxonmobil Upstream Research Company | Process for stimulating microbial activity in a hydrocarbon-bearing, subterranean formation |
US20040033557A1 (en) * | 2000-10-26 | 2004-02-19 | Scott Andrew R. | Method of generating and recovering gas from subsurface formations of coal, carbonaceous shale and organic-rich shales |
US7360595B2 (en) * | 2002-05-08 | 2008-04-22 | Cdx Gas, Llc | Method and system for underground treatment of materials |
US20060223153A1 (en) * | 2005-04-05 | 2006-10-05 | Luca Technologies, Llc | Generation of materials with enhanced hydrogen content from anaerobic microbial consortia |
WO2007022122A2 (en) * | 2005-08-12 | 2007-02-22 | University Of Wyoming Research Corporation D/B/A Western Research Institute | Biogenic methane production enhancement systems |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011089151A3 (en) * | 2010-01-19 | 2011-11-24 | Ecole Normale Superieure De Lyon | Method for producing methane gas |
CN102434185A (en) * | 2011-09-23 | 2012-05-02 | 河南中煤矿业科技发展有限公司 | Coal mine gas fast solvent and application method thereof |
CN103161440A (en) * | 2013-02-27 | 2013-06-19 | 中联煤层气国家工程研究中心有限责任公司 | Single-well coalbed methane horizontal well system and finishing method thereof |
WO2018201714A1 (en) * | 2017-05-02 | 2018-11-08 | 中国矿业大学 | Accurate extraction method for coal mine gas |
US11060384B2 (en) | 2017-05-02 | 2021-07-13 | China University Of Mining And Technology | Method for precisely extracting coal-mine gas |
CN107330220A (en) * | 2017-07-20 | 2017-11-07 | 中国矿业大学(北京) | Consider this coal seam concordant gas drilling design method of permeability anisotropy |
CN107330220B (en) * | 2017-07-20 | 2020-10-13 | 中国矿业大学(北京) | Coal seam bedding gas drilling hole design method considering permeability anisotropy |
CN112127868A (en) * | 2020-09-27 | 2020-12-25 | 中国地质大学(北京) | Test device for simulating underground coal gasification and oil shale co-production and test method thereof |
CN112127868B (en) * | 2020-09-27 | 2021-08-24 | 中国地质大学(北京) | Test device for simulating underground coal gasification and oil shale co-production and test method thereof |
Also Published As
Publication number | Publication date |
---|---|
AU2010268745A1 (en) | 2011-12-15 |
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