Water-gas ratio characteristics and development concepts for water-producing gas reservoirs
Water production from gas wells is a key factor affecting the effectiveness of gas-reservoir development, and it poses serious challenges in terms of increasing the degree of recovery during the waterless production stage and reducing the impact of water production on gas-reservoir development in th...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-08-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844023064095 |
| _version_ | 1827856077206585344 |
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| author | Shusheng Gao Jianzhong Zhang Huaxun Liu Liyou Ye Wenqing Zhu Wei Xiong |
| author_facet | Shusheng Gao Jianzhong Zhang Huaxun Liu Liyou Ye Wenqing Zhu Wei Xiong |
| author_sort | Shusheng Gao |
| collection | DOAJ |
| description | Water production from gas wells is a key factor affecting the effectiveness of gas-reservoir development, and it poses serious challenges in terms of increasing the degree of recovery during the waterless production stage and reducing the impact of water production on gas-reservoir development in the middle and later periods. Thus, gas reservoirs must be efficiently exploited on the basis of identifying gas-water layers accurately, defining gas-water relationships, and understanding gas-water production performance. Accordingly, this study analyzes the production characteristics in gas reservoirs with different gas-water relationships, and it summarizes the rules that determine water-gas ratios. The results reveal that the water-gas ratio increases rapidly in the early stage of water production, but after a period of time, it enters a relatively stable state in which it is almost a fixed value. According to the material balance equation, the theoretically calculated water-gas ratio is fully consistent with the production rules for an entire confined gas reservoir. This shows that the reality of gas-well-water production must be faced, and that the development of water-bearing gas reservoirs must accommodate gas and water co-production. The gas-water relationship, water body scale, and reservoir heterogeneity determine the time of water breakthrough and the water-gas ratio. Therefore, we should change the traditional “water fear” concept in gas-field development, aim for an overall improvement in recovery, face up to the fact that gas wells produce water, and coordinate the development of multi-wells for entire gas reservoirs, all of which will achieve the ultimate goal of improved gas recovery. |
| first_indexed | 2024-03-12T12:20:32Z |
| format | Article |
| id | doaj.art-5261b9e51b7c4e5bb7a596059b21c2e8 |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-12T12:20:32Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-5261b9e51b7c4e5bb7a596059b21c2e82023-08-30T05:53:59ZengElsevierHeliyon2405-84402023-08-0198e19201Water-gas ratio characteristics and development concepts for water-producing gas reservoirsShusheng Gao0Jianzhong Zhang1Huaxun Liu2Liyou Ye3Wenqing Zhu4Wei Xiong5Research Institute of Petroleum Exploration & Development, Beijing 100083, China; University of Chinese Academy of Sciences, Beijing 101408, China; Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, ChinaResearch Institute of Petroleum Exploration & Development, Beijing 100083, China; University of Chinese Academy of Sciences, Beijing 101408, China; Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China; Corresponding author. Research Institute of Petroleum Exploration & Development, Beijing 100083, China.Research Institute of Petroleum Exploration & Development, Beijing 100083, China; Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, ChinaResearch Institute of Petroleum Exploration & Development, Beijing 100083, China; University of Chinese Academy of Sciences, Beijing 101408, China; Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, ChinaResearch Institute of Petroleum Exploration & Development, Beijing 100083, China; Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, ChinaResearch Institute of Petroleum Exploration & Development, Beijing 100083, China; University of Chinese Academy of Sciences, Beijing 101408, China; Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, ChinaWater production from gas wells is a key factor affecting the effectiveness of gas-reservoir development, and it poses serious challenges in terms of increasing the degree of recovery during the waterless production stage and reducing the impact of water production on gas-reservoir development in the middle and later periods. Thus, gas reservoirs must be efficiently exploited on the basis of identifying gas-water layers accurately, defining gas-water relationships, and understanding gas-water production performance. Accordingly, this study analyzes the production characteristics in gas reservoirs with different gas-water relationships, and it summarizes the rules that determine water-gas ratios. The results reveal that the water-gas ratio increases rapidly in the early stage of water production, but after a period of time, it enters a relatively stable state in which it is almost a fixed value. According to the material balance equation, the theoretically calculated water-gas ratio is fully consistent with the production rules for an entire confined gas reservoir. This shows that the reality of gas-well-water production must be faced, and that the development of water-bearing gas reservoirs must accommodate gas and water co-production. The gas-water relationship, water body scale, and reservoir heterogeneity determine the time of water breakthrough and the water-gas ratio. Therefore, we should change the traditional “water fear” concept in gas-field development, aim for an overall improvement in recovery, face up to the fact that gas wells produce water, and coordinate the development of multi-wells for entire gas reservoirs, all of which will achieve the ultimate goal of improved gas recovery.http://www.sciencedirect.com/science/article/pii/S2405844023064095Water-producing gas reservoirGas-water relationshipWater-gas ratioMass balanceCoordinated development |
| spellingShingle | Shusheng Gao Jianzhong Zhang Huaxun Liu Liyou Ye Wenqing Zhu Wei Xiong Water-gas ratio characteristics and development concepts for water-producing gas reservoirs Heliyon Water-producing gas reservoir Gas-water relationship Water-gas ratio Mass balance Coordinated development |
| title | Water-gas ratio characteristics and development concepts for water-producing gas reservoirs |
| title_full | Water-gas ratio characteristics and development concepts for water-producing gas reservoirs |
| title_fullStr | Water-gas ratio characteristics and development concepts for water-producing gas reservoirs |
| title_full_unstemmed | Water-gas ratio characteristics and development concepts for water-producing gas reservoirs |
| title_short | Water-gas ratio characteristics and development concepts for water-producing gas reservoirs |
| title_sort | water gas ratio characteristics and development concepts for water producing gas reservoirs |
| topic | Water-producing gas reservoir Gas-water relationship Water-gas ratio Mass balance Coordinated development |
| url | http://www.sciencedirect.com/science/article/pii/S2405844023064095 |
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