3D characterization of coal strains induced by compression, carbon dioxide sorption, and desorption at in-situ stress conditions

Pone, J. Dénis N.; Halleck, P.M.; Mathews, Jonathan P.

doi:10.1016/j.coal.2009.11.010

Cited by 46 publications

(13 citation statements)

References 50 publications

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“…This competition may be particularly important during ECBM operations in deep coal seams, since CO 2 pressures are then expected to be high. Although effects of stress applied to the solid coal framework were not addressed in this study, these have proven to be of major importance too (Hol et al, 2011a(Hol et al, , 2012Karacan, 2007;Pone et al, 2009;Wang et al, 2011). We will not consider in detail here the effects of the in situ stress state of the coal formation.…”

Section: Implications For Ecbm Reservoir Characterisationmentioning

confidence: 92%

Competition between adsorption-induced swelling and elastic compression of coal at CO2 pressures up to 100MPa

Hol

Spiers

2012

Journal of the Mechanics and Physics of Solids

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Section: Implications For Ecbm Reservoir Characterisationmentioning

confidence: 92%

Competition between adsorption-induced swelling and elastic compression of coal at CO2 pressures up to 100MPa

Hol

Spiers

2012

Journal of the Mechanics and Physics of Solids

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“…The Uinta basin has high CH 4 content ranging from 250 to 400 scf/ton (US-DOE, 2004) with the highest recovery factor amongst all Coal shrinkage and swelling with gas desorption/adsorption has an important influence on the evolution of permeability (Bustin et al, 2008;Cui et al, 2007;Harpalani and Chen, 1995;Kelemen et al, 2006;Seidle and Huitt, 1995). Coal swells with adsorption of CO 2 and develops compactive stresses if mechanically constrained (Day et al, 2010;Pone et al, 2010;Reucroft and Patel, 1986;Siemons and Busch, 2007). Coal swelling has been implicated as observed reductions in permeabilities during ECBM operations at pilot plant scale (Durucan and Shi, 2009;Kiyama et al, 2011;van Bergen et al, 2006).…”

Section: Introductionmentioning

confidence: 97%

“…Coal swelling has been implicated as observed reductions in permeabilities during ECBM operations at pilot plant scale (Durucan and Shi, 2009;Kiyama et al, 2011;van Bergen et al, 2006). Gas adsorption and related swelling is largely impacted by sorption capacity, coal rank and the composition of the permeating gas (Chikatamarla et al, 2004a, b;Levine, 1996;Pone et al, 2010). The uptake of gas by coal at various pore pressures is often represented by the sorption isotherm (Kelemen et al, 2006;Levine, 1996).…”

Section: Introductionmentioning

confidence: 97%

Optimizing enhanced coalbed methane recovery for unhindered production and CO2 injectivity

Kumar¹,

Elsworth²,

Liu

et al. 2012

International Journal of Greenhouse Gas Control

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“…; Pone et al . ). The reduction of coal permeability is thus a consequence of swelling strain with CO 2 sorption (van Bergen et al .…”

Section: Introductionmentioning

confidence: 97%

Permeability evolution in sorbing media: analogies between organic‐rich shale and coal

et al. 2015

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Shale gas reservoirs like coalbed methane (CBM) reservoirs are promising targets for geological sequestration of carbon dioxide (CO 2 ). However, the evolution of permeability in shale reservoirs on injection of CO 2 is poorly understood unlike CBM reservoirs. In this study, we report measurements of permeability evolution in shales infiltrated separately by nonsorbing (He) and sorbing (CO 2 ) gases under varying gas pressures and confining stresses. Experiments are completed on Pennsylvanian shales containing both natural and artificial fractures under nonpropped and propped conditions. We use the models for permeability evolution in coal (Journal of Petroleum Science and Engineering, Under Revision) to codify the permeability evolution observed in the shale samples. It is observed that for a naturally fractured shale, the He permeability increases by approximately 15% as effective stress is reduced by increasing the gas pressure from 1 MPa to 6 MPa at constant confining stress of 10 MPa. Conversely, the CO 2 permeability reduces by a factor of two under similar conditions. A second core is split with a fine saw to create a smooth artificial fracture and the permeabilities are measured for both nonpropped and propped fractures. The He permeability of a propped artificial fracture is approximately 2-to 3fold that of the nonpropped fracture. The He permeability increases with gas pressure under constant confining stress for both nonpropped and propped cases. However, the CO 2 permeability of the propped fracture decreases by between one-half to one-third as the gas pressure increases from 1 to 4 MPa at constant confining stress. Interestingly, the CO 2 permeability of nonpropped fracture increases with gas pressure at constant confining stress. The permeability evolution of nonpropped and propped artificial fractures in shale is found to be similar to those observed in coals but the extent of permeability reduction by swelling is much lower in shale due to its lower organic content. Optical profilometry is used to quantify the surface roughness. The changes in surface roughness indicate significant influence of proppant indentation on fracture surface in the shale sample. The trends of permeability evolution on injection of CO 2 in coals and shales are found analogous; therefore, the permeability evolution models previously developed for coals are adopted to explain the permeability evolution in shales.

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3D characterization of coal strains induced by compression, carbon dioxide sorption, and desorption at in-situ stress conditions

Cited by 46 publications

References 50 publications

Competition between adsorption-induced swelling and elastic compression of coal at CO2 pressures up to 100MPa

Competition between adsorption-induced swelling and elastic compression of coal at CO2 pressures up to 100MPa

Optimizing enhanced coalbed methane recovery for unhindered production and CO2 injectivity

Permeability evolution in sorbing media: analogies between organic‐rich shale and coal

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