Conceptual economics of full scale enhanced coalbed methane production and CO2 storage in anthracitic coals at South Qinshui basin, Shanxi, China

Wong, Samuel S. Y.; MacDonald, Doug; Andrei, S.; Gunter, William D.; Deng, Xiangtian; Law, David H.-S.; Ye, J.; Feng, Shan; Zhai, Fan; Ho, P. Sai-wing

doi:10.1016/j.coal.2010.01.011

Cited by 38 publications

(17 citation statements)

References 5 publications

(8 reference statements)

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“…Gas saturation of coal reservoirs in the Weibei CBM field ranges from 39.2%~87.2% [55,56]. The micro-pilot test results showed that the gas saturation is 40.8% in the anthracitic coals of the South Qinshui basin, China [58]. Seam 4 in the Lower Cretaceous Gates Formation, Inner Foothills of Alberta showed gas saturation levels of 90% in the in situ reservoir conditions [53].…”

Section: Recovery Mechanism Of Unsaturated Cbm Reservoirsmentioning

confidence: 99%

“…Thus, unsaturated CBM reservoirs refer to those reservoirs in which gas content is less than their maximum gas adsorption in the reservoir conditions. Most coal reservoirs can be substantially unsaturated with thermogenic gas [45][46][47][48][49][50][51][52][53][54][55][56][57][58]. Gas saturation of coal reservoirs in the Weibei CBM field ranges from 39.2%~87.2% [55,56].…”

Section: Recovery Mechanism Of Unsaturated Cbm Reservoirsmentioning

confidence: 99%

“…Additionally, the third Klinkenberg effect has seldom been considered in permeability variation of the recovery of CBM reservoirs. It is widely thought that coal can be substantially unsaturated with thermogenic gas if not augmented by hydrocarbon migration or late-stage bacterial methanogenesis [45][46][47][48][49][50][51][52][53][54][55][56][57][58]. In consideration of this fact, we improved the existing permeability models in this paper to make them more suitable for describing permeability dynamic variation in unsaturated CBM reservoirs based on the production performance of those reservoirs, and discuss the sensitivity of various parameters, including the gas content, initial reservoir pressure, Langmuir volume and pressure, Poisson's ratio, Young's modulus, Langmuir strain, and Klinkenberg coefficient, to permeability dynamic variation in the recovery of unsaturated CBM reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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Permeability Variation Models for Unsaturated Coalbed Methane Reservoirs

Tang

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-A large number of models have been established to describe permeability variation with the depletion of reservoir pressure to date. However, no attempt has been made to draw enough attention to the difference in the effect of various factors on permeability variation in different production stages of unsaturated CoalBed Methane (CBM) reservoirs. This paper summarizes the existing and common permeability models, determines the relationship between various effects (effective stress effect, matrix shrinkage effect and Klinkenberg effect) and desorption characteristics of the recovery of unsaturated CBM reservoirs, then establishes two improved models to quantificationally describe permeability variation, and finally discusses the effects of various factors (gas saturation, cleat porosity, Poisson's ratio and shrinkage coefficient) on permeability variation. The results show that permeability variation during the recovery of unsaturated CBM reservoirs can be divided into two stages: the first one is that permeability variation is only affected by the effective stress effect, and the second is that permeability variation is affected by the combination of the effective stress effect, matrix shrinkage effect and Klinkenberg effect. In the second stage, matrix shrinkage effect and Klinkenberg effect play much more significant role than the effective stress effect, which leads to an increase in permeability with depletion of reservoir pressure. Sensitivity analysis of parameters in the improved models reveals that those parameters associated with gas saturation, such as gas content, reservoir pressure, Langmuir volume and Langmuir pressure, have a significant impact on permeability variation in the first stage, and the important parameters in the second stage are the gas content, reservoir pressure, Langmuir volume, Langmuir pressure, Poisson's ratio, Young's modulus and shrinkage coefficient during the depletion of reservoir pressure. A comparative study of the improved models indicates that the improved SD model has a greater sensitivity to various parameters than the improved PM model and the improved models describe permeability dynamic variation more exactly than the original ones.Résumé -Modèles de variation de perméabilité pour des réservoirs de gaz de houille insaturé -Un grand nombre de modèles ont été établis à ce jour pour décrire la variation de perméabilité en fonction de l'épuisement de la pression du réservoir. Toutefois, aucune tentative n'a été faite pour attirer suffisamment l'attention sur la différence d'effet des différents facteurs sur la variation de perméabilité dans différentes phases de production des réservoirs de gaz de houille insaturés (CoalBed Methane, CBM). Le présent article résume les modèles de perméabilité existants et usuels, détermine la relation entre les différents effets (effet de contrainte effective, effet du rétrécissement

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Section: Recovery Mechanism Of Unsaturated Cbm Reservoirsmentioning

confidence: 99%

Section: Recovery Mechanism Of Unsaturated Cbm Reservoirsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Permeability Variation Models for Unsaturated Coalbed Methane Reservoirs

Tang

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…The studies indicated economic potential for N 2 -and flue gas-ECBM. Others have investigated the economic feasibility of CO 2 -ECBM (Reeves and Oudinot, 2005a;Robertson, 2009;Wong et al, 2010). The business case for N 2 -ECBM is reliant on the value of the incremental recovery over the incremental costs incurred (such as the cost of injection wells and the cost of injectant gas).…”

Section: Introductionmentioning

confidence: 98%

Methodology for the economic assessment of enhanced coal mine methane drainage (ECMM) as a fugitive emissions reduction strategy

Sander¹,

Connell²

2012

International Journal of Greenhouse Gas Control

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“…Applying the discounted cashflow method to the evaluation of CBM resources usually relies on a conceptual or detailed development program (Shimada and Yamaguchi 2009;Wong et al 2010;Sander et al 2011;Robertson 2009;Sander and Connell 2014;Chen et al 2012a;Zhou et al 2013;Yang 2008;Cao and Wang 2011).However, during the target selection phase, drilling and exploration work have yet to begin; therefore, no conditions exist for forecasting the development program, which makes it difficult for the conventional methods and procedures to be used to perform an evaluation. Due to the present difficulties with economic evaluation, geological evaluation remains the primary method used during the target selection phase (Zhao and Zhang 1999;Wang et al 2009;Liu et al 2001;Chen et al 2012b;Hou et al 2014).…”

Section: Introductionmentioning

confidence: 99%

An economic evaluation method of coalbed methane resources during the target selection phase of exploration

Luo

Xia

2015

Pet. Sci.

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Because forecasting a development program during the target selection phase of exploration for coalbed methane (CBM) is impossible, the conventional method that relies on a conceptual (or detailed) development program cannot be used during the economic evaluation of CBM resources. Hence, this study focuses on establishing an economic evaluation model based on the characteristics of the target selection phase. The discounted cashflow method is applied to the construction of the model with the assumption that there is a uniform distribution of production wells. The computational error generated by the assumption is corrected by introducing a correction factor based on the production profile of single CBM wells. The case study demonstrates that the blocks lacking economic value can be screened out, and the most advantageous targets can be found by computing the resource values in the best-and worst-case scenarios. This technique can help to reduce wasted investments and improve the quality of decision-making in selecting targets for exploration.

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Conceptual economics of full scale enhanced coalbed methane production and CO2 storage in anthracitic coals at South Qinshui basin, Shanxi, China

Cited by 38 publications

References 5 publications

Permeability Variation Models for Unsaturated Coalbed Methane Reservoirs

Permeability Variation Models for Unsaturated Coalbed Methane Reservoirs

Methodology for the economic assessment of enhanced coal mine methane drainage (ECMM) as a fugitive emissions reduction strategy

An economic evaluation method of coalbed methane resources during the target selection phase of exploration

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