CA2438134A1 - Process for predicting porosity and permeability of a coal bed - Google Patents

Process for predicting porosity and permeability of a coal bed Download PDF

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Publication number
CA2438134A1
CA2438134A1 CA002438134A CA2438134A CA2438134A1 CA 2438134 A1 CA2438134 A1 CA 2438134A1 CA 002438134 A CA002438134 A CA 002438134A CA 2438134 A CA2438134 A CA 2438134A CA 2438134 A1 CA2438134 A1 CA 2438134A1
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Prior art keywords
sps
pressure
coal bed
initial
porosity
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CA002438134A
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French (fr)
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CA2438134C (en
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William Daniel Gunter
Matthew John Mavor
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Alberta Innovates Technology Futures
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Alberta Research Council
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    • 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
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/005—Waste disposal systems
    • E21B41/0057—Disposal of a fluid by injection into a subterranean formation
    • E21B41/0064—Carbon dioxide sequestration
    • 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
    • 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
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/008—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by injection test; by analysing pressure variations in an injection or production test, e.g. for estimating the skin factor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

Abstract

A method for predicting the secondary porosity system (SPS) porosity, and thereby permeability, of a coal bed involves determining an initial condition in the coal bed, including an initial SPS pressure and an initial sorbed gas composition, determining a pressure strain effect due to increasing the SPS pressure to a value greater than the initial SPS pressure, and determining a sorption strain effect due to changes in the sorbed gas composition resulting from decreasing the methane content and increasing the content of a stronger adsorbing fluid (SAG) relative to the initial sorbed gas composition. Preferably, the method uses data from test injections of water and/or a weaker adsorbing fluid (WAG) and a SAG. The data is used in the inventors' model to compute a SPS porosity and an absolute permeability at a reference SPS pressure and a reference sorbed gas composition. Preferably, the reference pressure is atmospheric pressure. The inventors' model accounts for both dynamic pressure strain and dynamic multicomponent sorption strain effects. As a result, a calibrated model can be produced for the coal bed for predicting the coal bed's SPS porosity, and thereby permeability, as a function of a pre-selected injection or production fluid's composition and/or SPS pressure conditions.
CA002438134A 2002-09-30 2003-08-25 Process for predicting porosity and permeability of a coal bed Expired - Fee Related CA2438134C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/261,201 2002-09-30
US10/261,201 US6860147B2 (en) 2002-09-30 2002-09-30 Process for predicting porosity and permeability of a coal bed

Publications (2)

Publication Number Publication Date
CA2438134A1 true CA2438134A1 (en) 2004-03-30
CA2438134C CA2438134C (en) 2008-06-17

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Family Applications (1)

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CA002438134A Expired - Fee Related CA2438134C (en) 2002-09-30 2003-08-25 Process for predicting porosity and permeability of a coal bed

Country Status (3)

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US (1) US6860147B2 (en)
AU (1) AU2003248458B2 (en)
CA (1) CA2438134C (en)

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CN109871507A (en) * 2017-12-05 2019-06-11 中国矿业大学(北京) Orthotropy cracks in coal seam absolute permeability calculation method
CN110984970A (en) * 2019-10-09 2020-04-10 中国海洋石油集团有限公司 Method for determining starting pressure gradient by utilizing formation test
CN112816387A (en) * 2020-12-31 2021-05-18 北京市水利规划设计研究院 Method and device for determining permeability coefficient and storage medium
CN113008753A (en) * 2021-02-01 2021-06-22 重庆科技学院 Method for optimizing gas-water phase permeability curve of gas reservoir by applying two-dimensional experiment
CN113138150A (en) * 2021-04-27 2021-07-20 中国平煤神马能源化工集团有限责任公司 Transient pressure-based low-permeability coal seam in-situ permeability testing method and device
CN114293974A (en) * 2022-01-07 2022-04-08 中海石油(中国)有限公司 Method and system for determining original gas content of coal bed gas development well
CN114658391A (en) * 2020-12-22 2022-06-24 中联煤层气有限责任公司 Dynamic pressure regulating method and related device for drainage and production shaft of coal-bed gas well
CN112145165B (en) * 2019-12-26 2024-04-23 中国海洋石油集团有限公司 Microcrack-pore type reservoir dynamic and static permeability conversion method

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CN110984970A (en) * 2019-10-09 2020-04-10 中国海洋石油集团有限公司 Method for determining starting pressure gradient by utilizing formation test
CN110984970B (en) * 2019-10-09 2023-03-24 中国海洋石油集团有限公司 Method for determining starting pressure gradient by utilizing formation test
CN112145165B (en) * 2019-12-26 2024-04-23 中国海洋石油集团有限公司 Microcrack-pore type reservoir dynamic and static permeability conversion method
CN114658391A (en) * 2020-12-22 2022-06-24 中联煤层气有限责任公司 Dynamic pressure regulating method and related device for drainage and production shaft of coal-bed gas well
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CN112816387A (en) * 2020-12-31 2021-05-18 北京市水利规划设计研究院 Method and device for determining permeability coefficient and storage medium
CN113008753A (en) * 2021-02-01 2021-06-22 重庆科技学院 Method for optimizing gas-water phase permeability curve of gas reservoir by applying two-dimensional experiment
CN113138150A (en) * 2021-04-27 2021-07-20 中国平煤神马能源化工集团有限责任公司 Transient pressure-based low-permeability coal seam in-situ permeability testing method and device
CN114293974A (en) * 2022-01-07 2022-04-08 中海石油(中国)有限公司 Method and system for determining original gas content of coal bed gas development well
CN114293974B (en) * 2022-01-07 2023-12-15 中海石油(中国)有限公司 Method and system for determining original gas content of coal bed gas development well

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US20040060351A1 (en) 2004-04-01
CA2438134C (en) 2008-06-17
AU2003248458B2 (en) 2009-12-03
US6860147B2 (en) 2005-03-01
AU2003248458A1 (en) 2004-04-22

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