Influence of CO2 Exposure on High-Pressure Methane and CO2 Adsorption on Various Rank Coals: Implications for CO2 Sequestration in Coal Seams

Wang, Qianqian; Zhang, Dengfeng; Wang, Haohao; Jiang, Wenping; Wu, Xiuping; Yang, Jin; Huo, Peili

doi:10.1021/acs.energyfuels.5b00058

Cited by 97 publications

(97 citation statements)

References 68 publications

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“…However, the storage potential of CO 2 in coal beds is not as large as in salt formations or oil reservoirs, moreover, the CO 2 -ECBM technology is still at the pilot projects stage [46]. For example, some issues related to the behavior of methane and CO 2 at ultra-high pressures are not well studied yet [47]. These factors are a barrier to the implementation of the ECBM technology chain.…”

Section: Ccs Technological Chainsmentioning

confidence: 99%

Potential of Russian Regions to Implement CO2-Enhanced Oil Recovery

et al. 2018

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Abstract:The paper assesses the techno-economic potential of Russia to implement carbon capture and storage technologies that imply the capture of anthropogenic CO 2 and its injection into geologic reservoirs for long-term storage. The focus is on CO 2 enhanced oil recovery projects that seem to be the most economically promising option of carbon capture and storage. The novelty of the work lies in the formulation of a potential assessment method of CO 2 enhanced oil recovery, which allows for establishing a connection between energy production and oil extraction from the viewpoint of CO 2 supply and demand. Using linear optimization, the most promising combinations of CO 2 sources and sinks are identified and an economic evaluation of these projects is carried out. Based on this information, regions of Russia are ranked according to their prospects in regards to CO 2 capture and enhanced oil recovery storage. The results indicate that Russia has a significant potential to utilize its power plants as CO 2 sources for enhanced oil recovery projects. It has been estimated that 71 coal-fired power plants, and 185 of the gas-fired power plants of Russia annually produce 297.1 and 309.6 Mt of CO 2 that can cover 553.4 Mt of the demand of 322 Russian oil fields. At the same time, the total CO 2 storage capacity of the Russian fields is estimated at 7382.6 Mt, however, due to geological and technical factors, only 22.6% can be used for CO 2 -EOR projects. Of the 183 potential projects identified in the regional analysis phase, 99 were found to be cost-effective, with an average unit cost of € 19.07 per ton of CO 2 and a payback period of 8.71 years. The most promising of the estimated regions is characterized by a well-developed energy industry, relatively low transportation costs, numerous large and medium-sized oil fields at the final stages of development, and favorable geological conditions that minimize the cost of injection. Geographically, they are located in the North-Western, Volga, and Ural Federal districts.

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Section: Ccs Technological Chainsmentioning

confidence: 99%

Potential of Russian Regions to Implement CO2-Enhanced Oil Recovery

et al. 2018

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“…Because CO 2 is a non-polar molecule, SC-CO 2 was used in the experiment to extract coal with the result that some compounds in the matrix pores or fractures can be extracted by SC-CO 2 and flow from the seepage channel along with air (Zhang et al, 2013). In this process, emphases should be given to compounds extracted by SC-CO 2 , which may cause environmental issues needing special attention on practical enhanced coal bed methane (ECBM) projects (Wang et al, 2015). Moreover, it has been proven that major components of volatile constituents that contain types of hydrocarbons, existing in the pore mouths or necks, cause a negative effect on the connectivity of pore structure (Bae et al, 2009;Nguyen and Bhatia, 2007).…”

Section: Ftir Analysismentioning

confidence: 99%

“…The decrease of micropores after SC-CO 2 treatment can be explained by the effect of adsorption-induced deformation in pores, which may lead to the expansion of micropores with increasing CO 2 pressure (Yang et al, 2011). Previous studies have shown that the extraction effect of SC-CO 2 causes a decline in the roughness degree of coal surface, and the effect is to transform smaller pores into larger pores (Gathitu et al, 2009;Wang et al, 2015;Zhang et al, 2013). The total pore volume and porosity of coal, as shown in Table 3, increased moderately after SC-CO 2 treatment.…”

Section: Further Analysis On Pore Structuresmentioning

confidence: 99%

Influence of supercritical CO2 on pore structure and functional groups of coal: Implications for CO2 sequestration

Zhang

Wang

et al. 2017

Journal of Natural Gas Science and Engineering

105

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To better understand the effects of CO 2 sequestration and long-term storage, it is worth studying the interactions between supercritical CO 2 (SC-CO 2) and coal, and its influence on coal properties or, more specifically, the changes in coal pore structure and functional groups caused by SC-CO 2. In this study, three different metamorphic grades of coal were sampled and exposed to SC-CO 2 (~40 °C and 10 MPa) for 120 hr through a geochemical reactor, simulating CO 2 storage in deep coal seams. The functional groups and pore structure of different coal ranks before and after SC-CO 2 treatment were measured by Fourier Transform Infrared Spectroscopy (FTIR), Mercury Intrusion Porosimetry (MIP) and physical adsorption method. The results show that the absorption peak intensity of-OH groups, with intramolecular association and C-H stretching vibrations, clearly changed for anthracite compared to others. Compounds with weakly polar functional groups, such as hydrocarbons, epoxy and lipid compounds (ether or ester), decreased significantly, whereas strongly polar functional groups exhibited only a slight change. Pore structure and distribution of each pore phase showed the diversity present in different coal ranks. The development of seepage-flow pores (mesopore and macropore) was promoted by SC-CO 2. For high rank and medium rank coals, the degree of pore development was significantly altered by SC-CO 2 , while pore development in low rank coal was largely unaltered. The results of this study contribute to the understanding of coal structure evolution and its effects on coal reservoir during long-term geological sequestration.

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“…China's energy structure is characterized by rich coal reserve, and meager oil and gas reserves . As a result, coal and coal‐bed methane (CBM) play an important role in its energy supply .…”

Section: Introductionmentioning

confidence: 99%

Hydraulic flushing in soft coal sublayer: Gas extraction enhancement mechanism and field application

Zhang

Wang

Yuan

et al. 2019

Energy Science & Engineering

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In China, one or several ultrathin soft coal sublayers are widely developed in the coal seam. Therefore, a method of using hydraulic flushing in soft sublayer to enhance the gas extraction in these particular coal seams is developed in this work. We first established a new fully coupled gas extraction model by combing gas diffusion, gas flow, and a permeability model that considers the effect of stress change and plastic failure. By adopting this model, the gas extraction enhancement mechanism and its main influence factors were studied using the numerical simulation method based on the engineering and geological background in the Yangquan No.5 coalmine. Thereafter, a hydraulic flushing equipment, which could move freely in the underground coalmine, was developed to apply the hydraulic flushing method in soft coal sublayers used in the 8402 working face. Its gas extraction effect was systematically investigated. Our simulation results match well with the field results, suggesting that our model is feasible. Meanwhile, after adopting this method, the gas extraction condition in this coalmine improves significantly. The borehole number decreases by 66.7%, while the gas extraction rate and gas extraction concentration increase by 1.33 times and 3 times, respectively. Moreover, during the coal mining process, the gas adsorption index of drilling cuttings, the quantity of drilling cuttings, and the CH4 concentration also decrease dramatically.

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Influence of CO₂ Exposure on High-Pressure Methane and CO₂ Adsorption on Various Rank Coals: Implications for CO₂ Sequestration in Coal Seams

Cited by 97 publications

References 68 publications

Potential of Russian Regions to Implement CO2-Enhanced Oil Recovery

Potential of Russian Regions to Implement CO2-Enhanced Oil Recovery

Influence of supercritical CO2 on pore structure and functional groups of coal: Implications for CO2 sequestration

Hydraulic flushing in soft coal sublayer: Gas extraction enhancement mechanism and field application

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