Relative Permeability of Coal: A Review

Zhang, Jiyuan; Feng, Qihong; Zhang, Xianmin; Wen, Shengjun; Zhai, Yue

doi:10.1007/s11242-014-0414-4

Cited by 67 publications

(40 citation statements)

References 122 publications

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“…Relative permeability functions derived from Zhang et al [65] were tested in this context for the coal seam layer but show only a negligible effect on the water flow calculations in our models. Taking this finding into account and aiming at improving numerical convergence, we assume that the relative permeability functions given in Equations (8) and (9) are valid for both lithological layers, while capillary pressure effects can be neglected.…”

Section: Numerical Model Implementationmentioning

confidence: 99%

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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Section: Numerical Model Implementationmentioning

confidence: 99%

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

Otto

Kempka

2017

Energies

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“…4.2 Bubble-water flow in a capillary tube with barriers inside 4.2.1 Effects of capillary pressure on bubble-water flow As pointed out by Clarkson et al (2011) and Zhang et al (2015), capillary pressure is essential in characterising the bubble-water flow behaviour in porous media. In this section, two sets of simulations are performed, based on the geometries shown in Fig.…”

Section: Effects Of Bubble Size On Bubble-water Flowmentioning

confidence: 99%

“…Several studies have been done to understand the two-phase flow physics in coal seams (Clarkson et al, 2011;Kalam et al, 2012;Karacan, 2013;Zhang et al, 2015). However, most of them are either based on laboratory core flooding experiment data or field data, and they cannot explain the factors controlling the multiphase flow at pore scale (Dawe et al, 2011;Ofori et al, 2010;Shen et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Pore-scale simulation of effects of coal wettability on bubble-water flow in coal cleats using lattice Boltzmann method

Xing

2017

Chemical Engineering Science

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(Huilin Xing) We study the effects of coal wettability on gas bubble/water two-phase flow behaviour in micro-cleats of the coal seam gas reservoir using a free energy based two-phase lattice Boltzmann model. The model is validated by comparison with analytical results and published results, and good agreement is achieved in general. Then we use this model to simulate bubble-water flow in both smooth capillary and a capillary with a narrow throat to systematically study the influences of contact angle, capillary pressure and bubble size on the flow behaviour. The simulation results indicate that both the bubble size and contact angle have significant impacts on the flow capacity of bubble and water, especially in a channel with a narrow throat. A decrease in water flow rate is observed when larger bubbles occur, and the water flow rate increases when the gas wettability becomes stronger. The bubble flow dynamics significantly influence the drainage of water and the further gas production.

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“…The various methods used to determine or derive relative permeability of coal, and the limitations of these methods, were reviewed by Zhang et al (2015); these methods include unsteady-state and state-state laboratory core flooding experiments, capillary pressure measurements of cores, and history matching of production data. However, despite the importance of relative permeability parameters as inputs to reservoir simulation tools used to predict and optimise the economic viability of CSG resource developments (Clarkson et al, 2011) there remains a large gap between relative permeability parameters measured in controlled laboratory experiments and those derived from field data (Chen et al, 2013;Meaney and Paterson, 1996).…”

Section: Introductionmentioning

confidence: 99%

Creation of microchannels in Bowen Basin coals using UV laser and reactive ion etching

Mahoney

Rufford

Rudolph

et al. 2015

International Journal of Coal Geology

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Relative Permeability of Coal: A Review

Cited by 67 publications

References 122 publications

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

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

Pore-scale simulation of effects of coal wettability on bubble-water flow in coal cleats using lattice Boltzmann method

Creation of microchannels in Bowen Basin coals using UV laser and reactive ion etching

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