Modeling of coal bed methane (CBM) production and CO2 sequestration in coal seams

Abstract

A mathematical model was developed to predict the coal bed methane (CBM) production and carbon dioxide (CO 2 ) sequestration in a coal seam accounting for the coal seam properties. The model predictions showed that, for a CBM production and dewatering process, the pressure could be reduced from 15.17 MPa to 1.56 MPa and the gas saturation increased up to 50% in 30 years for a 5.4 × 10 5 m 2 of coal formation. For the CO 2 sequestration process, the model prediction showed that the CO 2 injection rate was first reduced and then slightly recovered over 3 to 13 years of injection, which was also evidenced by the actual in seam data. The model predictions indicated that the sweeping of the water in front of the CO 2 flood in the cleat porosity could be important on the loss of injectivity. Further model predictions suggested that the injection rate of CO 2 could be about 11 × 10 3 m 3 per day; the injected CO 2 would reach the production well, which was separated from the injection well by 826 m, in about 30 years. During this period, about 160 × 10 6 m 3 of CO 2 could be stored within a 21.4 × 10 5 m 2 of coal seam with a thickness of 3 m.

Notice of Retraction: Study on seepage model of coalbed methane based on threshold pressure gradient

“…A three-dimensional, two phase flow seepage model considering the threshold pressure gradient obtains by invoking (13) into (12) and (11) as [19]: (14) 734 (15) Pw, Pg, Sw, Sgin (14) and (15) meets the equation of state as:…”

Physical and structural effects of carbon dioxide storage on vitrinite-rich coal particles under subcritical and supercritical conditions

“…Gas storage in coal seams is however quite complex due to the intricate and heterogeneous nature of the coal, as evidenced by the substantial dedication of literature to the subject (Maphala and Wagner, 2012;Cao et al, 2011;Mastalerz et al, 2010;Gathitu et al, 2009;Ozdemir, 2009;Karacan, 2003Karacan, , 2007Goodman et al, 2005;Larsen, 2004;Crosdale et al, 1998). However, there is still much that is not understood about coal-CO 2 interactions (Mirzaeian and Hall, 2006;Larsen, 2004).…”

Coalbed methane with CO2 sequestration: An emerging clean coal technology in India

“…The result shows that CO 2 has more affinity on coal than CH 4 . Ozdemir et al [22] developed a mathematical model to assess the methane recovery with CO 2 sequestration in coal beds. Pashin et al [23] reviewed the CBM potential of Black Warrior basin in west-central Alabama to assess the potential of carbon sequestration.…”