Geological Storage of CO2 to Enhance Coalbed Methane Production

The concentration of carbon dioxide gas in atmosphere is remarkably increasing because of burning fossil fuels, such as coal, natural gas and oil. CO2 is an important Greehouse Gas which results in global warming, and it also threatens human life security and social economy sustainable developing. CO2 geological storage is considered to be a fairly significant way to seal CO2 permanently, it can also slow down global warming. Coals have a super adsorption capacity, especially to CO2, because of the special dual porosity and huge specific surface. Therefore, CO2 can be injected and sequestrated in coal seams by geological storage. Geological storage of CO2 can not only reduces its concentration in atmosphere, but also can enhance coalbed methane production synchronously. The paper discusses CO2 injection and sequestration in coal bed to enhance CBM production mechanism, feasibility and propose a technical route. Experiments show that the technical route of CO2 geological storage to enhance CBM production is feasible, and the technical of CO2 geological storage is good for slowing down globle warming and reducing gas accidents.

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Microbial Simulation Experiment on Enhancing Coalbed Methane Production

10.20944/preprints201903.0078.v1 ◽

2019 ◽

Author(s):

Chen Hao ◽

Qin Yong ◽

Zhou Shangwen ◽

Wang Hongyan ◽

Chen Zhenhong ◽

...

Keyword(s):

Methane Production ◽

Coalbed Methane ◽

Simulation Experiment ◽

Bacterial Species ◽

Gas Production ◽

Gas Generation ◽

Exogenous Bacteria ◽

Different Temperatures ◽

Cbm Production ◽

Coalbed Methane Production

Coalbed Methane(CBM) production enhancement for single wells is a big problem to CBM industrialization. Low production is due to insufficient gas generation by thermogenic. Luckily, Biogenic gas was found in many areas and its supply is assumed to improve coalbed methane production. Therefore, microbial simulation experiment will demonstrate the effectiveness of the assumption. From microbial simulation experiment on different coal ranks, it is found that microbes can use coals to produce biogas under laboratory conditions. With different temperatures for different experiments, it turns out that the gas production at 35 ℃ is greater than that at 15℃,indicating that 35℃ is more suitable for microbes to produce gas. According to quantitative experiments, adding exogenous nutrients or exogenous bacteria can improve CBM production. Moreover, the production enhancement ratio can reach up to 115% under the condition of adding exogenous bacterial species, while the ratio for adding nutrients can be up to 144%.

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Prediction of Coalbed Methane Production Based on BP Neural Network

E3S Web of Conferences ◽

10.1051/e3sconf/201913101059 ◽

2019 ◽

Vol 131 ◽

pp. 01059

Author(s):

Tianxiang Zhang ◽

Yifang Tang ◽

Jianjun Wu ◽

Zixi Guo ◽

Bing Li

Keyword(s):

Neural Network ◽

Bp Neural Network ◽

Methane Production ◽

Coalbed Methane ◽

Coal Bed ◽

Coal Bed Methane ◽

Correlation Degree ◽

Coalbed Methane Production ◽

Exploration And Development ◽

Production Prediction

The low average daily gas production per well and the poor economic benefit of exploration and development have become the main problems restricting the exploration and development of coalbed methane in China. Combining multiple coal seam geological parameters to predict the high-yield area of the block can not only provide guidance for the exploitation of coal-bed methane, but also bring enormous economic benefits. Aiming at the difficulty of coalbed methane dessert discrimination and production prediction, a method of coal-bed methane production prediction based on BP neural network is proposed in this paper. Starting from the average daily production of coalbed methane single well, we use the method of grey correlation degree to get the main controlling factors of coalbed methane production. For the main control factors, we use BP neural network with high fitting accuracy and get a good prediction result.

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