Experimental Study on Water Shutoff Technology Using In-Situ Ion Precipitation for Gas Reservoirs
Once a gas well begins to produce water, gas production will be seriously affected. If no effective measures are taken, the gas well will be shut down. Although some methods can be adopted to limit the production of unwanted water in gas reservoirs, they do not radically solve the problem of excessi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-10-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/20/3881 |
| _version_ | 1811183793334124544 |
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| author | Xu Zhang Weihua Liu Lilong Yang Xiang Zhou Ping Yang |
| author_facet | Xu Zhang Weihua Liu Lilong Yang Xiang Zhou Ping Yang |
| author_sort | Xu Zhang |
| collection | DOAJ |
| description | Once a gas well begins to produce water, gas production will be seriously affected. If no effective measures are taken, the gas well will be shut down. Although some methods can be adopted to limit the production of unwanted water in gas reservoirs, they do not radically solve the problem of excessive water production, which may cause gas shutoff and dramatically increase the cost of dealing with disposing of the unwanted water. In this study, water shutoff technology with in-situ ion precipitation was tested for a gas well in southwest China, with results demonstrated through experiments of ion precipitation distribution and core displacement. The results of the ion precipitation distribution experiments show that it can be artificially controlled to produce ion precipitation blocking the water layer. The distribution of ion precipitation depends on influencing factors including injection flow rate, injection height, and ion concentration, which is generally hill-shaped. Dynamic displacement experiments through two types of cores (matrix core and fracture core) show that during the process of injecting gas-field water into the core, the ion precipitation caused by the in-situ reaction constantly blocked the seepage channel, resulting in a significant decrease in the injection rate. After injection of the gas-field water, the permeability of the core decreased, the starting pressure gradient increased, and the effect of water shutoff was remarkable. Given the experimental results, the in-situ ion precipitation water-plugging technology for gas reservoirs can directly solve the problem of water production in gas wells in the water layer because it can block the water layer by using formation water itself. This technology has promise for use in southwest China and can provide technical guidance for other gas reservoirs. |
| first_indexed | 2024-04-11T11:52:13Z |
| format | Article |
| id | doaj.art-9ccaaff1243b4b37b81021578d7df22a |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T11:52:13Z |
| publishDate | 2019-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-9ccaaff1243b4b37b81021578d7df22a2022-12-22T04:25:17ZengMDPI AGEnergies1996-10732019-10-011220388110.3390/en12203881en12203881Experimental Study on Water Shutoff Technology Using In-Situ Ion Precipitation for Gas ReservoirsXu Zhang0Weihua Liu1Lilong Yang2Xiang Zhou3Ping Yang4School of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaFaculty of Engineering and Applied Science, University of Regina, Regina, SK S4S0A2, CanadaSchool of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, ChinaSchool of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, ChinaOnce a gas well begins to produce water, gas production will be seriously affected. If no effective measures are taken, the gas well will be shut down. Although some methods can be adopted to limit the production of unwanted water in gas reservoirs, they do not radically solve the problem of excessive water production, which may cause gas shutoff and dramatically increase the cost of dealing with disposing of the unwanted water. In this study, water shutoff technology with in-situ ion precipitation was tested for a gas well in southwest China, with results demonstrated through experiments of ion precipitation distribution and core displacement. The results of the ion precipitation distribution experiments show that it can be artificially controlled to produce ion precipitation blocking the water layer. The distribution of ion precipitation depends on influencing factors including injection flow rate, injection height, and ion concentration, which is generally hill-shaped. Dynamic displacement experiments through two types of cores (matrix core and fracture core) show that during the process of injecting gas-field water into the core, the ion precipitation caused by the in-situ reaction constantly blocked the seepage channel, resulting in a significant decrease in the injection rate. After injection of the gas-field water, the permeability of the core decreased, the starting pressure gradient increased, and the effect of water shutoff was remarkable. Given the experimental results, the in-situ ion precipitation water-plugging technology for gas reservoirs can directly solve the problem of water production in gas wells in the water layer because it can block the water layer by using formation water itself. This technology has promise for use in southwest China and can provide technical guidance for other gas reservoirs.https://www.mdpi.com/1996-1073/12/20/3881gas reservoirsion precipitationin-situ water shutoffexperimental study |
| spellingShingle | Xu Zhang Weihua Liu Lilong Yang Xiang Zhou Ping Yang Experimental Study on Water Shutoff Technology Using In-Situ Ion Precipitation for Gas Reservoirs Energies gas reservoirs ion precipitation in-situ water shutoff experimental study |
| title | Experimental Study on Water Shutoff Technology Using In-Situ Ion Precipitation for Gas Reservoirs |
| title_full | Experimental Study on Water Shutoff Technology Using In-Situ Ion Precipitation for Gas Reservoirs |
| title_fullStr | Experimental Study on Water Shutoff Technology Using In-Situ Ion Precipitation for Gas Reservoirs |
| title_full_unstemmed | Experimental Study on Water Shutoff Technology Using In-Situ Ion Precipitation for Gas Reservoirs |
| title_short | Experimental Study on Water Shutoff Technology Using In-Situ Ion Precipitation for Gas Reservoirs |
| title_sort | experimental study on water shutoff technology using in situ ion precipitation for gas reservoirs |
| topic | gas reservoirs ion precipitation in-situ water shutoff experimental study |
| url | https://www.mdpi.com/1996-1073/12/20/3881 |
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