Methane emission characteristics and model of CBM wells
CBM (CBM) development in coal mining area has good safety, economic and energy benefits, but methane emission is common in surface well sites. In view of this, taking the CBM wells in Qinshui County of Shanxi Province as an example, the methane emission location and emission volume of CBM wells are...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.1037985/full |
| _version_ | 1797956175477604352 |
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| author | Qingxiang Dong Shengwei Wang Shengwei Wang Jinkui Ma Shuaifeng Lyu Weiyong Lu |
| author_facet | Qingxiang Dong Shengwei Wang Shengwei Wang Jinkui Ma Shuaifeng Lyu Weiyong Lu |
| author_sort | Qingxiang Dong |
| collection | DOAJ |
| description | CBM (CBM) development in coal mining area has good safety, economic and energy benefits, but methane emission is common in surface well sites. In view of this, taking the CBM wells in Qinshui County of Shanxi Province as an example, the methane emission location and emission volume of CBM wells are obtained, and the prediction model of methane emission volume is established through field investigation and multiple regression analysis. The results show that 81% of CBM wells have methane emission. Wellhead and drainage outlet are the two main positions of methane emission. The proportion of wells with emission volume between 0 and 10 m3/d is 59%. On the whole, the emission accounts for 1.53% of the gas well production. There is almost no methane emission in the single liquid phase flow stage. The methane emission in the gas-liquid two-phase flow stage is positively correlated with the bottom hole flow pressure, times of stroke and gas production, and negatively correlated with the pump embedment and water production. The bottom hole flow pressure and the pump embedment have the greatest impact on the methane emission. In the single-phase gas flow stage, methane emission is positively correlated with gas production and casing pressure, and negatively correlated with stroke frequency and water production. |
| first_indexed | 2024-04-10T23:45:55Z |
| format | Article |
| id | doaj.art-78edb5c5d7714af4b73ae6b98c4aaa23 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-10T23:45:55Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-78edb5c5d7714af4b73ae6b98c4aaa232023-01-11T04:35:54ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-01-011010.3389/feart.2022.10379851037985Methane emission characteristics and model of CBM wellsQingxiang Dong0Shengwei Wang1Shengwei Wang2Jinkui Ma3Shuaifeng Lyu4Weiyong Lu5School of Earth Resources, China University of Geosciences, Wuhan, ChinaSchool of Earth Resources, China University of Geosciences, Wuhan, ChinaState Key Laboratory of Coal and CBM Co-mining, Jincheng, ChinaState Key Laboratory of Coal Mine Safety Technology, China Coal Technology & Engineering Group Shenyang Research Institute, Shenyang, ChinaSchool of Earth Resources, China University of Geosciences, Wuhan, ChinaSchool of Mining Engineering, Lyuliang University, Lyuliang, ChinaCBM (CBM) development in coal mining area has good safety, economic and energy benefits, but methane emission is common in surface well sites. In view of this, taking the CBM wells in Qinshui County of Shanxi Province as an example, the methane emission location and emission volume of CBM wells are obtained, and the prediction model of methane emission volume is established through field investigation and multiple regression analysis. The results show that 81% of CBM wells have methane emission. Wellhead and drainage outlet are the two main positions of methane emission. The proportion of wells with emission volume between 0 and 10 m3/d is 59%. On the whole, the emission accounts for 1.53% of the gas well production. There is almost no methane emission in the single liquid phase flow stage. The methane emission in the gas-liquid two-phase flow stage is positively correlated with the bottom hole flow pressure, times of stroke and gas production, and negatively correlated with the pump embedment and water production. The bottom hole flow pressure and the pump embedment have the greatest impact on the methane emission. In the single-phase gas flow stage, methane emission is positively correlated with gas production and casing pressure, and negatively correlated with stroke frequency and water production.https://www.frontiersin.org/articles/10.3389/feart.2022.1037985/fullcoalbed methane wellmethane emissiongas-liquid two-phase flowsingle gas phase flowmultiple linear regression |
| spellingShingle | Qingxiang Dong Shengwei Wang Shengwei Wang Jinkui Ma Shuaifeng Lyu Weiyong Lu Methane emission characteristics and model of CBM wells Frontiers in Earth Science coalbed methane well methane emission gas-liquid two-phase flow single gas phase flow multiple linear regression |
| title | Methane emission characteristics and model of CBM wells |
| title_full | Methane emission characteristics and model of CBM wells |
| title_fullStr | Methane emission characteristics and model of CBM wells |
| title_full_unstemmed | Methane emission characteristics and model of CBM wells |
| title_short | Methane emission characteristics and model of CBM wells |
| title_sort | methane emission characteristics and model of cbm wells |
| topic | coalbed methane well methane emission gas-liquid two-phase flow single gas phase flow multiple linear regression |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.1037985/full |
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