Coupled reservoir and geomechanical simulation for a deep underground coal gasification project

Kasani, Hossein Akbarzadeh; Chalaturnyk, Richard J.

doi:10.1016/j.jngse.2016.12.002

Cited by 31 publications

(10 citation statements)

References 11 publications

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“…The focus was to understand the Alberta deep UCG project response which was discussed elsewhere [29]. In that site, the coal seam is located at a depth of~1400 m. Mean in-situ effective stress was estimated 14 MPa.…”

Section: Testing Programmentioning

confidence: 99%

Influence of High Pressure and Temperature on the Mechanical Behavior and Permeability of a Fractured Coal

Kasani

Chalaturnyk

2017

Energies

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Understanding mechanical behavior and permeability of coal at ambient and high temperature is key in optimizing high-temperature in-situ processes such as underground coal gasification. The main objectives of this study were to characterize thermal deformation, stress-strain behavior, and gas permeability of coal samples acquired from the Genesee coal mine in Central Alberta, Canada under various temperatures and confining stresses. These measurements were conducted in a high-pressure high-temperature triaxial apparatus. Initial thermal expansion of the coal was followed by contraction in both axial and lateral directions at about 140 • C. This temperature corresponds to occurrence of pyrolysis in the coal. All specimens showed brittle behavior during shear while forming complex shear planes. The specimens exhibited compressional volumetric strain responses at all temperatures. Deformation localization initiated at various stage during shearing. Specimens sheared at 200 • C showed higher peak stresses and larger axial strains compared to those tested at room temperature (24 • C). Fluctuations of permeability were observed with confining stress and temperature. Permeability dropped at 80 • C due to thermal expansion of coal and closure of initial fractures; however, it increased at 140 and 200 • C due to a combined response of thermal expansion and pyrolysis. Small axial strain during shear was observed to reduce permeability.

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Section: Testing Programmentioning

confidence: 99%

Influence of High Pressure and Temperature on the Mechanical Behavior and Permeability of a Fractured Coal

Kasani

Chalaturnyk

2017

Energies

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“…This re-emerging technology could provide a relevant contribution to the development of Clean Coal Technologies, if accompanied by carbon capture and storage, e.g., in the reactor cavities generated in the coal following the cease of operation [4][5][6]. Apart from its high economic potentials [7][8][9], UCG may induce environmental impacts such as freshwater aquifer pollution by synthesis gas and/or by-product leakage [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Next to mechanical stress changes triggered by coal excavation, thermal stresses also induce permeability changes in the reactor's close vicinity [19,[23][24][25][26]. Furthermore, permeability affects natural convection that transports fluids along with heat and potential UCG by-products into the overburden.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Steam Jacket Dynamics and Water Balances in Underground Coal Gasification

Otto

Kempka

2017

Energies

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Underground coal gasification (UCG) converts coal to a high-calorific synthesis gas for the production of fuels or chemical feedstock. UCG reactors are generally operated below hydrostatic pressure to avoid leakage of UCG fluids into overburden aquifers. Additionally, fluid flow out of and into the reactor is also determined by the presence of the steam jacket, emerging in close reactor vicinity due to the high temperatures generated in UCG operation. Aiming at improving the understanding of the substantial role of the steam jacket in UCG operations, we employ numerical non-isothermal multiphase flow simulations to assess the occurring multiphase fluid flow processes. For that purpose, we first validate our modeling approach against published data on the U.S. UCG field trials at Hanna and Hoe Creek, achieving a very good agreement between our simulation and the observed water balances. Then, we discuss the effect of coal seam permeability and UCG reactor pressure on the dynamic multiphase flow processes in the reactor's vicinity. The presented modeling approach allows for the quantification and prediction of time-dependent temperature and pressure distributions in the reactor vicinity, and thus steam jacket dynamics as well as reactor water inand outflows.

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“…This shows that the coal seam have the characteristics of the dominant cleat. Keywords: coal, coal cleat, sonic log PENDAHULUAN Salah satu pemanfaatan batubara dengan metode nonkonvensional adalah menerapkan teknologi gasifikasi batubara bawah permukaan atau biasa disebut underground coal gasification (UCG), yang merupakan teknologi in-situ untuk mengekstraksi energi batubara yang tidak dapat ditambang secara konvensional (Kasani dan Chalaturnyk, 2017). Teknologi ini diklaim ramah lingkungan dalam pemanfaatan batubara untuk pembangkit listrik tenaga uap, karena batubara yang ada di bawah permukaan digasifikasi langsung secara in-situ menghasilkan produk berupa syngas yang akan diolah untuk berbagai macam keperluan.…”

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Identifikasi karakteristik kekar batubara lapisan batubara D berbasis pengamatan singkapan, korelasi data log sonik dan kualitas massa batuan (RQD)

Yudha¹,

Purnama²

2019

JTMB

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Kekar batubara adalah rekahan alami di dalam lapisan batubara yang berperan penting dalam stimulasi pembentukan rongga pada proses gasifikasi batubara bawah permukaan. Oleh karena itu, penelitian mengenai karakteristik kekar batubara yang berkembang di dalam lapisan batubara penting dilakukan. Penelitian ini bertujuan untuk mengetahui karakteristik kekar batubara yang berada di daerah Macang Sakti, Musi Banyuasin, Sumatera Selatan, hubungan antara kekar batubara yang ada di permukaan dan kekar batubara yang berada di bawah permukaan. Objek yang diteliti adalah Lapisan Batubara D yang berada di konsesi pertambangan PT. Astaka Dodol. Penelitian ini dilakukan melalui pengambilan data lapangan dan mengorelasikan data pengamatan kekar batubara singkapan dengan data hasil pengeboran berupa data log sonik dan rock quality designation (RQD). Hasilnya, kekar batubara yang berada pada lapisan batubara tersebut merupakan kekar batubara endogenik, terlihat dari arah orientasinya yang relatif tegak lurus terhadap bidang perlapisan batubara. Frekuensi kekar muka pada lapisan batubara tersebut berkisar 10-20 kekar batubara tiap 2 m 2 . Dari data log sonik dan RQD, kekar batubara pada lapisan batubara umumnya berarah NNE-WSW dan berkembang mulai dari bagian atas sampai dengan bagian bawah Lapisan Batubara D dengan frekuensi kekar muka berkisar 10-20 kekar batubara pada area pengamatan 2 m 2 . Hal ini mengakibatkan perolehan dan nilai RQD yang jelek pada saat melakukan pengeboran inti. Lapisan batubara kurva log sonik mengalami naik-turun gelombang, sedangkan pada batuan lain relatif lebih konstan. Hal ini menunjukkan bahwa lapisan batubara tersebut memiliki karakteristik kekar batubara yang dominan.

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Coupled reservoir and geomechanical simulation for a deep underground coal gasification project

Cited by 31 publications

References 11 publications

Influence of High Pressure and Temperature on the Mechanical Behavior and Permeability of a Fractured Coal

Influence of High Pressure and Temperature on the Mechanical Behavior and Permeability of a Fractured Coal

Prediction of Steam Jacket Dynamics and Water Balances in Underground Coal Gasification

Identifikasi karakteristik kekar batubara lapisan batubara D berbasis pengamatan singkapan, korelasi data log sonik dan kualitas massa batuan (RQD)

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