Study on evaporation drainage of deep coal seam gas wells
Targeting the problem of a small amount of fluid accumulation in deep coal seam gas (CSG) wells during flowing production stage, the evaporation drainage method is proposed to discharge the liquid accumulation. Based on the Dalton evaporation model and wind speed function, a calculation model of eva...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-02-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2024.1339901/full |
| _version_ | 1797300434283528192 |
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| author | Hongying Zhu Chuankai Jing Fenna Zhang Yaoguang Qi Hao Hu Tiantian Yi |
| author_facet | Hongying Zhu Chuankai Jing Fenna Zhang Yaoguang Qi Hao Hu Tiantian Yi |
| author_sort | Hongying Zhu |
| collection | DOAJ |
| description | Targeting the problem of a small amount of fluid accumulation in deep coal seam gas (CSG) wells during flowing production stage, the evaporation drainage method is proposed to discharge the liquid accumulation. Based on the Dalton evaporation model and wind speed function, a calculation model of evaporation drainage was established for deep CSG wells, which was verified by laboratory experiments. Taking a CSG well in the western Ordos Basin as an example to analyze the evaporation drainage capacity, the influence of temperature, daily gas production, bottomhole flowing pressure (BHFP), formation gas water saturation on the evaporation drainage capacity was investigated. The results show that the maximum evaporation water production is 2,533.8 kg/d at a bottomhole temperature of 80°C and a gas production rate of 30 × 103 m3/d. It is found that the temperature and pressure have a marked influence on the evaporation drainage. By improving the gas production and bottomhole temperature, and reducing the BHFP can effectively promote the evaporation drainage capacity. The initial moisture content of CSG in the reservoir are inversely proportional to the evaporation drainage capacity. By adjusting the BHFP and daily gas production, the evaporation drainage capacity can match the liquid production rate of the formation. Evaporation drainage can effectively extend the flowing production time of deep CSG wells and reduce the costs of production. |
| first_indexed | 2024-03-07T23:07:12Z |
| format | Article |
| id | doaj.art-7b10dc8a14a2484fad1c26e4de429c17 |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-03-07T23:07:12Z |
| publishDate | 2024-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-7b10dc8a14a2484fad1c26e4de429c172024-02-22T04:47:09ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2024-02-011210.3389/fenrg.2024.13399011339901Study on evaporation drainage of deep coal seam gas wellsHongying Zhu0Chuankai Jing1Fenna Zhang2Yaoguang Qi3Hao Hu4Tiantian Yi5College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao, ChinaCollege of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao, ChinaCollege of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao, ChinaCollege of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao, ChinaChina United Coalbed Methane Co., Ltd., Taiyuan, ChinaCollege of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao, ChinaTargeting the problem of a small amount of fluid accumulation in deep coal seam gas (CSG) wells during flowing production stage, the evaporation drainage method is proposed to discharge the liquid accumulation. Based on the Dalton evaporation model and wind speed function, a calculation model of evaporation drainage was established for deep CSG wells, which was verified by laboratory experiments. Taking a CSG well in the western Ordos Basin as an example to analyze the evaporation drainage capacity, the influence of temperature, daily gas production, bottomhole flowing pressure (BHFP), formation gas water saturation on the evaporation drainage capacity was investigated. The results show that the maximum evaporation water production is 2,533.8 kg/d at a bottomhole temperature of 80°C and a gas production rate of 30 × 103 m3/d. It is found that the temperature and pressure have a marked influence on the evaporation drainage. By improving the gas production and bottomhole temperature, and reducing the BHFP can effectively promote the evaporation drainage capacity. The initial moisture content of CSG in the reservoir are inversely proportional to the evaporation drainage capacity. By adjusting the BHFP and daily gas production, the evaporation drainage capacity can match the liquid production rate of the formation. Evaporation drainage can effectively extend the flowing production time of deep CSG wells and reduce the costs of production.https://www.frontiersin.org/articles/10.3389/fenrg.2024.1339901/fulldeep coal seam gas wellevaporation drainageexperimental validation of the evaporation modelprolong time of flowing productionliquid loading cleanup |
| spellingShingle | Hongying Zhu Chuankai Jing Fenna Zhang Yaoguang Qi Hao Hu Tiantian Yi Study on evaporation drainage of deep coal seam gas wells Frontiers in Energy Research deep coal seam gas well evaporation drainage experimental validation of the evaporation model prolong time of flowing production liquid loading cleanup |
| title | Study on evaporation drainage of deep coal seam gas wells |
| title_full | Study on evaporation drainage of deep coal seam gas wells |
| title_fullStr | Study on evaporation drainage of deep coal seam gas wells |
| title_full_unstemmed | Study on evaporation drainage of deep coal seam gas wells |
| title_short | Study on evaporation drainage of deep coal seam gas wells |
| title_sort | study on evaporation drainage of deep coal seam gas wells |
| topic | deep coal seam gas well evaporation drainage experimental validation of the evaporation model prolong time of flowing production liquid loading cleanup |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2024.1339901/full |
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