Improving the CO2 well injectivity and enhanced coalbed methane production performance in coal seams

Durucan, Şevket; Shi, Ji‐Quan

doi:10.1016/j.coal.2008.09.012

Cited by 92 publications

(68 citation statements)

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“…The latter assumption is justified by considering the situation where gas injection starts at the end of the so-called primary recovery operation. In fact, during primary recovery almost all the water originally present in the reservoir is removed and the remaining fraction can be safely considered immobile (Zhu et al 2003;Durucan and Shi 2009). In the following the two main components that constitute the model are presented, namely the mass balances accounting for gas flow and sorption, and the stress-strain relationship for the description of porosity and permeability changes during injection.…”

Section: Modelingmentioning

confidence: 99%

“…First, flue gas is the combustion exhaust gas produced by power plants, and it could therefore be directly injected, thus avoiding the expensive capture step. Secondly, flue gas consists of mostly nitrogen (87%) and carbon dioxide (13%); the presence of the weakly adsorbing N 2 would allow keeping the coal permeability sufficiently high (Bustin et al 2008;Durucan and Shi 2009). This option's obvious drawback would be the need to compress not only CO 2 but also nitrogen before injection.…”

Section: Introductionmentioning

confidence: 99%

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A model for enhanced coal bed methane recovery aimed at carbon dioxide storage

2011

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Numerical simulations on the performance of CO 2 storage and enhanced coal bed methane (ECBM) recovery in coal beds are presented. For the calculations, a one-dimensional mathematical model is used consisting of mass balances describing gas flow and sorption, and a geomechanical relationship to account for porosity and permeability changes during injection. Important insights are obtained regarding the gas flow dynamics during displacement and the effects of sorption and swelling on the ECBM operation. In particular, initial faster CH 4 recovery is obtained when N 2 is added to the injected mixture, whereas pure CO 2 allows for a more effective displacement in terms of total CH 4 recovery. Moreover, it is shown that coal swelling dramatically affects the gas injectivity, as the closing of the fractures associated with it strongly reduces coal's permeability. As a matter of fact, injection of flue gas might represent a useful option to limit this problem. NotationA Cross sectional area [m 2 ] b Langmuir equilibrium constant [1/Pa] b s Langmuir equilibrium constant (swelling)) [1/Pa] c Gas phase concentration [mol/m 3 ] C 1 Effective pressure coefficient [1/Pa] C 2 Swelling coefficients [-] F Molar flow rate [mol/day] GIP Original Gas In Place [mol] i Component i I Amount injected [mol] k Permeability [m 2 ], 1 mD = 9.869233 × 10 −16 m 2 k m Mass transfer coefficient [1/s] k ij Interaction parameter (Peng Robinson) [-] L Coal bed length [m] n Adsorbed phase concentration [mol/m 3 ] n * Equilibrium adsorbed phase concentration [mol/m 3 ] n ∞ Saturation capacity per unit mass adsorbent [mol/g] n c Number of components [-] P Gas phase pressure [Pa] P c Confining pressure [Pa] P u Purity [%] R Recovery factor [%] s Volumetric swelling [-] s ∞ Saturation capacity (swelling) [-] S Amount stored [mol] t Time [s] T Temperature [°C] u Superficial fluid velocity [m/s] v Interstitial fluid velocity [m/s] w Acentric factor (Peng Robinson) [-] y Gas phase molar fraction [m 3 /mol] z Axial coordinate [m] 890 Adsorption (2011) 17:889-900

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Section: Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A model for enhanced coal bed methane recovery aimed at carbon dioxide storage

2011

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“…Injection of N 2 or CO 2 can reduce the partial pressure of methane in seam, which promotes methane desorption from coal matrix (Puri and Yee, 1990;Durucan and Shi, 2009). At same time, the different sorption capacity (described by Langmuir volume, V L ) may cause different matrix shrinkage and swelling.…”

Section: Simulation Results With Matrix Shrinkage/swelling Model 51mentioning

confidence: 99%

“…It should be evaluated for different schemes before it is used for ECBM, so as to evaluate the influence of seam geomechanical parameters (Gorucu et al, 2007), injection of gas mixture (Durucan and Shi, 2009), seam properties, and adsorption models (Pan and Connell, 2009 It is confirmed that N 2 flooding can reverse permeability reduction due to matrix swelling (Shi et al, 2008). But pure N 2 and N 2 rich ECBM may affect CO 2 storage.…”

Section: Discussionmentioning

confidence: 99%

Influence and Sensitivity Study of Matrix Shrinkage and Swelling on Enhanced Coalbed Methane Production and CO₂ Sequestration with Mixed Gas Injection

Zhou

Yao

Tang

et al. 2011

Energy Exploration & Exploitation

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Matrix compressibility, shrinkage and swelling can cause profound changes in porosity and permeability of coalbed during gas sorption and desorption. These factors affect the distribution of pressure, methane production and CO 2 sequestration.This paper compares the effects of cleat compression and matrix shrinkage and swelling models with the injection of different compositional gas mixtures (CO 2 and N 2 ). It shows that well performance, pressure distribution and properties of the seam are strongly affected by matrix shrinkage and swelling. Matrix shrinkage and swelling also affects net present value of the enhanced coalbed methane recovery scheme. In order to select the best enhanced coalbed methane recovery schemes, economic evaluation and sensitivity studies are necessary.

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“…Secondly, because ECBM is based on an adsorption (CO 2 )/desorption (CH 4 ) process; studies have shown that it is indeed the dynamic of this displacement which affects the quantity and the quality of the recovered gas, and therefore the overall economics of the process (Jessen et al 2008;Durucan and Shi 2009). Moreover, beside the knowledge of the adsorption behavior of a mixture of carbon dioxide and methane on coal, other binary systems, such as carbon dioxide-nitrogen or nitrogenmethane, or even ternary mixtures of them, may be promising to treat, being the direct injection of a flue gas instead of pure CO 2 into a coal seam an option under consideration (White et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Prediction of competitive adsorption on coal by a lattice DFT model

et al. 2009

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Adsorption is one of the main mechanisms involved in the ECBM process, a technology where CO 2 (or flue gas, i.e. a CO 2 /N 2 mixture) is injected into a deep coal bed, with the aim of storing CO 2 by simultaneously recovering CH 4 . A detailed understanding of the microscopic adsorption process is therefore needed, as the latter controls the displacement process. A lattice DFT model, previously extended to mixtures, has been applied to predict the competitive adsorption behavior of CO 2 , CH 4 and N 2 and of their mixtures in slit-shaped pores of 1.2 and 8 nm width. In particular, the effect of temperature, bulk composition and density on the resulting lattice pore profiles and on the lattice excess adsorption isotherms has been investigated. Important insights could be obtained; when approaching near critical conditions in the mesopores, a characteristic peak in the excess adsorption isotherm of CO 2 appears. The same effect could be observed neither for the other gases nor in the micropores. Moreover, in the case of mixtures, a depletion of the less adsorbed species close to the adsorbent surface is observed, which eventually results in negative lattice excess adsorption at high bulk densities.

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Improving the CO2 well injectivity and enhanced coalbed methane production performance in coal seams

Cited by 92 publications

References 5 publications

A model for enhanced coal bed methane recovery aimed at carbon dioxide storage

A model for enhanced coal bed methane recovery aimed at carbon dioxide storage

Influence and Sensitivity Study of Matrix Shrinkage and Swelling on Enhanced Coalbed Methane Production and CO₂ Sequestration with Mixed Gas Injection

Prediction of competitive adsorption on coal by a lattice DFT model

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Improving the CO2 well injectivity and enhanced coalbed methane production performance in coal seams

Cited by 92 publications

References 5 publications

A model for enhanced coal bed methane recovery aimed at carbon dioxide storage

A model for enhanced coal bed methane recovery aimed at carbon dioxide storage

Influence and Sensitivity Study of Matrix Shrinkage and Swelling on Enhanced Coalbed Methane Production and CO2 Sequestration with Mixed Gas Injection

Prediction of competitive adsorption on coal by a lattice DFT model

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Influence and Sensitivity Study of Matrix Shrinkage and Swelling on Enhanced Coalbed Methane Production and CO₂ Sequestration with Mixed Gas Injection