A preliminary laboratory experiment on coalbed methane displacement with carbon dioxide injection

Yu, Hao; Yuan, Jian Jun; Guo, Wei; Cheng, Jiulong; Hu, Qianting

doi:10.1016/j.coal.2007.04.005

Cited by 50 publications

(27 citation statements)

References 19 publications

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“…4). The volumetric storage capacity ratio for the three gases stands at 1 N 2 :4 CH 4 : 26 CO 2 , similar results were reported by Yu et al (2008). …”

Section: Maximum Holding Capacity (Adsorption Isotherm)supporting

confidence: 89%

Preliminary reservoir model of enhanced coalbed methane (ECBM) in a subbituminous coal seam, Huntly Coalfield, New Zealand

Zarrouk

Moore

2009

International Journal of Coal Geology

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“…4). The volumetric storage capacity ratio for the three gases stands at 1 N 2 :4 CH 4 : 26 CO 2 , similar results were reported by Yu et al (2008). …”

Section: Maximum Holding Capacity (Adsorption Isotherm)supporting

confidence: 89%

Preliminary reservoir model of enhanced coalbed methane (ECBM) in a subbituminous coal seam, Huntly Coalfield, New Zealand

Zarrouk

Moore

2009

International Journal of Coal Geology

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“…Based on the discovery of biomineralization, researchers have begun to develop new cementing materials. Biomineralization can also be used in the treatment of environmental pollution such as the removal or fixing of heavy metals [32,33] and the depletion of carbon dioxide [34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Biomineralization Induced by Bacillus subtilis J2 and Characteristics of the Biominerals

et al. 2019

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Biomineralization induced by microorganisms has become a hot spot in the field of carbonate sedimentology; however, the mechanisms involved still need to be explored. In this study, the bacterium Bacillus subtilis J2 (GenBank MG575432) was used to induce the precipitation of calcium carbonate minerals at Mg/Ca molar ratios of 0, 3, 6, 9, and 12. Bacillus subtilis J2 bacteria released ammonia to increase pH, but the ammonia released only made the pH increase to 8.25. Carbonic anhydrase was also produced to catalyze the hydration of carbon dioxide, and this process released carbonate and bicarbonate ions that not only increased pH but also elevated carbonate supersaturation. The biominerals formed at a Mg/Ca molar ratio of 0 were spherulitic, elongated, dumbbell-shaped, and irregularly rhombohedral calcite; at a Mg/Ca molar ratio of 3, the biominerals were calcite and aragonite, the weight ratio of calcite decreased from 26.7% to 15.6%, and that of aragonite increased from 73.3% to 84.4% with increasing incubation time. At higher Mg/Ca molar ratios, the biominerals were aragonite, and the crystallinity and thermal stability of aragonite decreased with increasing Mg/Ca molar ratios. FTIR results showed that many organic functional groups were present on/within the biominerals, such as C–O–C, N–H, C=O, O–H, and C–H. HRTEM-SAED examination of the ultra-thin slices of B. subtilis J2 bacteria showed that nano-sized minerals with poor crystal structure had grown or been adsorbed on the EPS coating. The EPS of the B. subtilis J2 strain contained abundant glutamic acid and aspartic acid, which could be deprotonated in an alkaline condition to adsorb Ca2+ and Mg2+ ions; this made EPS act as the nucleation sites. This study may provide some references for further understanding of the mechanism of biomineralization induced by microorganisms.

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“…Recently, ECBM recovery by gas injection has been investigated by injecting CO 2 into a chromatographic column packed with crushed coal [Yu et al, 2008;G. Q. Tang et al, Laboratory and simulation investigation of enhanced coalbed methane recovery by gas injection, SPE paper 95947 presented at the SPE Annual Technical Conference and Exhibition, Society of Petroleum Engineers Inc., Dallas, Texas, 8-12 October 2005].…”

Section: Introductionmentioning

confidence: 99%

Role of adsorption and swelling on the dynamics of gas injection in coal

et al. 2009

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[1] An experimental technique is presented to perform gas injection experiments on coal cores confined by an external hydrostatic pressure, which makes use of the so-called transient step method. The experiments are intended to improve the knowledge on the different mechanisms acting during CO 2 storage in coal seams, in particular, those related to permeability. Helium, nitrogen, and carbon dioxide have been injected at pressure ranging from 10 to 80 bars and at confining pressures varying between 60 and 140 bars. The experiments with helium have been used to study the mechanical compliance of the coal core, whereas those with the adsorbing N 2 and CO 2 to study the effects of adsorption and swelling on the flow dynamics. The obtained experimental transient steps were successfully described using a mathematical model, consisting of mass balances accounting for gas flow and adsorption, and mechanical constitutive equations for the description of porosity and permeability changes during injection. A semiempirical relationship between permeability and operating pressures is validated, and the corresponding parameters have been evaluated. Results showed increase in permeability with decreasing effective pressure on the sample and, when an adsorbing gas was injected, a reduction in permeability caused by swelling, with CO 2 having a stronger effect compared to N 2 .

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A preliminary laboratory experiment on coalbed methane displacement with carbon dioxide injection

Cited by 50 publications

References 19 publications

Preliminary reservoir model of enhanced coalbed methane (ECBM) in a subbituminous coal seam, Huntly Coalfield, New Zealand

Preliminary reservoir model of enhanced coalbed methane (ECBM) in a subbituminous coal seam, Huntly Coalfield, New Zealand

Mechanism of Biomineralization Induced by Bacillus subtilis J2 and Characteristics of the Biominerals

Role of adsorption and swelling on the dynamics of gas injection in coal

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