Reasonable production allocation model of gas wells for deep tight gas reservoirs with the edge water
Deep tight gas reservoirs are one of the important unconventional gas reservoirs. Deep burial, tight reservoirs have many characteristics, including diverse accumulation patterns, multiple accumulation regulations, low natural energy generation, complex gas–water relationship, and intricate seepage...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-03-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2023.1139663/full |
| _version_ | 1797856295357775872 |
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| author | Weiting Huang Weiting Huang Weiting Huang Zedong Zhan Na Niu Yihang Xiao Yongheng Shi |
| author_facet | Weiting Huang Weiting Huang Weiting Huang Zedong Zhan Na Niu Yihang Xiao Yongheng Shi |
| author_sort | Weiting Huang |
| collection | DOAJ |
| description | Deep tight gas reservoirs are one of the important unconventional gas reservoirs. Deep burial, tight reservoirs have many characteristics, including diverse accumulation patterns, multiple accumulation regulations, low natural energy generation, complex gas–water relationship, and intricate seepage mechanism. These features of gas reservoirs put forward the requirement for new methods for a reasonable production allocation of horizontal wells and optimization of such allocations from the perspective of stress sensitivity. While CO2 huff-and-puff-based models, numerical simulation models, and thermos-hydrodynamic models have been built to solve these issues, there is still a lack of theoretical guidance for reasonable production allocation, especially with the edge-water problem. Here, we present a new one-dimensional mathematical and physical model to capture the stable movement of the gas–water interface in deep tight edge-water gas reservoirs. Our results show that there is a starting pressure in deep tight gas reservoirs. The starting pressure gradient increases with the growth of water saturation, which is far greater than the starting pressure gradient of medium, shallow gas reservoirs under the same water saturation. In addition, by considering the stable movement of the gas–water interface under the starting pressure, we found that the gas well has a larger upper limit of production differential pressure, a smaller seepage velocity, and a lower upper limit of production allocation. Finally, we make a comparison between our model results and production characteristics of real gas wells and find a consistency between the model results with real data. Our model provides a theoretical framework for reasonable production allocation of gas wells in deep tight gas reservoirs with the edge water. |
| first_indexed | 2024-04-09T20:38:08Z |
| format | Article |
| id | doaj.art-9d741553f36047c59aeef4a4e22955c3 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-09T20:38:08Z |
| publishDate | 2023-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-9d741553f36047c59aeef4a4e22955c32023-03-30T07:01:10ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-03-011110.3389/feart.2023.11396631139663Reasonable production allocation model of gas wells for deep tight gas reservoirs with the edge waterWeiting Huang0Weiting Huang1Weiting Huang2Zedong Zhan3Na Niu4Yihang Xiao5Yongheng Shi6College of Geophysics, Chengdu University of Technology, Chengdu, ChinaChengdu University of Technology Academic Journal Center, Chengdu, ChinaKey Laboratory of Geomathematics of Sichuan Province, Chengdu University of Technology, Chengdu, ChinaSouthwest Oil and Gas Company, SINOPEC, Chengdu, ChinaSouthwest Oil and Gas Company, SINOPEC, Chengdu, ChinaCollege of Energy, Chengdu University of Technology, Chengdu, ChinaPipeChina Oil and Gas Control Center, Beijing, ChinaDeep tight gas reservoirs are one of the important unconventional gas reservoirs. Deep burial, tight reservoirs have many characteristics, including diverse accumulation patterns, multiple accumulation regulations, low natural energy generation, complex gas–water relationship, and intricate seepage mechanism. These features of gas reservoirs put forward the requirement for new methods for a reasonable production allocation of horizontal wells and optimization of such allocations from the perspective of stress sensitivity. While CO2 huff-and-puff-based models, numerical simulation models, and thermos-hydrodynamic models have been built to solve these issues, there is still a lack of theoretical guidance for reasonable production allocation, especially with the edge-water problem. Here, we present a new one-dimensional mathematical and physical model to capture the stable movement of the gas–water interface in deep tight edge-water gas reservoirs. Our results show that there is a starting pressure in deep tight gas reservoirs. The starting pressure gradient increases with the growth of water saturation, which is far greater than the starting pressure gradient of medium, shallow gas reservoirs under the same water saturation. In addition, by considering the stable movement of the gas–water interface under the starting pressure, we found that the gas well has a larger upper limit of production differential pressure, a smaller seepage velocity, and a lower upper limit of production allocation. Finally, we make a comparison between our model results and production characteristics of real gas wells and find a consistency between the model results with real data. Our model provides a theoretical framework for reasonable production allocation of gas wells in deep tight gas reservoirs with the edge water.https://www.frontiersin.org/articles/10.3389/feart.2023.1139663/fulltight gas reservoirsedge-water gas reservoirreasonable production allocationstarting pressureproduction differential pressure |
| spellingShingle | Weiting Huang Weiting Huang Weiting Huang Zedong Zhan Na Niu Yihang Xiao Yongheng Shi Reasonable production allocation model of gas wells for deep tight gas reservoirs with the edge water Frontiers in Earth Science tight gas reservoirs edge-water gas reservoir reasonable production allocation starting pressure production differential pressure |
| title | Reasonable production allocation model of gas wells for deep tight gas reservoirs with the edge water |
| title_full | Reasonable production allocation model of gas wells for deep tight gas reservoirs with the edge water |
| title_fullStr | Reasonable production allocation model of gas wells for deep tight gas reservoirs with the edge water |
| title_full_unstemmed | Reasonable production allocation model of gas wells for deep tight gas reservoirs with the edge water |
| title_short | Reasonable production allocation model of gas wells for deep tight gas reservoirs with the edge water |
| title_sort | reasonable production allocation model of gas wells for deep tight gas reservoirs with the edge water |
| topic | tight gas reservoirs edge-water gas reservoir reasonable production allocation starting pressure production differential pressure |
| url | https://www.frontiersin.org/articles/10.3389/feart.2023.1139663/full |
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