Sand Blocking Mechanisms and Productivity Analysis of Slant Well in Siltstone Reservoirs
The siltstone reservoir with many small layers of pay zones is usually produced by slant holes. However, severe sand blockages take place when the siltstone reservoir is developed by slant holes. Currently, the sand blocking mechanisms and the effect of sand blocking on productivity of slant well ar...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/6662571 |
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| author | Peifeng Jia Chuanzhi Cui Yizhong Zhao Xiukun Wang Yingfei Sui |
| author_facet | Peifeng Jia Chuanzhi Cui Yizhong Zhao Xiukun Wang Yingfei Sui |
| author_sort | Peifeng Jia |
| collection | DOAJ |
| description | The siltstone reservoir with many small layers of pay zones is usually produced by slant holes. However, severe sand blockages take place when the siltstone reservoir is developed by slant holes. Currently, the sand blocking mechanisms and the effect of sand blocking on productivity of slant well are still challenges for engineers and scholars. In this paper, based on the existing productivity model of inclined slant wells, the mechanical skin factor, which describes the effect of sand blocking on productivity, is proposed. Meanwhile, many experimental works have been done to investigate the sand blocking mechanisms in siltstone reservoirs. From the experimental work, it is concluded that with the increase of displacement PV number and displacement flow rate, the permeability of sand control system decreases by 40%. When solid particles enter the casing and block the gravel and sand control screen in the annulus, the skin factor increases sharply and the productivity decreases by more than 80%. Through the productivity calculation of multilayer sand control wells, it is considered that larger gravel packing radius can keep particles away from the well bore, which is helpful to ensure oil well productivity. Furthermore, the influence of differential filling radius on the fluid production capacity of each layer of sand control well is analyzed. It is proved that optimizing the filling radius of each layer can improve the production effect of mediate- and low-permeability layers. This method has been applied in Kendong #12 block. The daily oil production rate is increased by 9.61 t/day, and the oil recovery of this block is increased by 2.12%. |
| format | Article |
| id | doaj-art-6d385cbc03c84a78942c87328d0f31b5 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-6d385cbc03c84a78942c87328d0f31b52025-02-03T01:05:31ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/66625716662571Sand Blocking Mechanisms and Productivity Analysis of Slant Well in Siltstone ReservoirsPeifeng Jia0Chuanzhi Cui1Yizhong Zhao2Xiukun Wang3Yingfei Sui4College of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, ChinaCollege of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, ChinaPetroleum Engineering Institute of Shengli Oil Field, SINOPEC, Dongying, 257015, ChinaUnconventional Petroleum Institute, China University of Petroleum, Beijing, 102249, ChinaCollege of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, ChinaThe siltstone reservoir with many small layers of pay zones is usually produced by slant holes. However, severe sand blockages take place when the siltstone reservoir is developed by slant holes. Currently, the sand blocking mechanisms and the effect of sand blocking on productivity of slant well are still challenges for engineers and scholars. In this paper, based on the existing productivity model of inclined slant wells, the mechanical skin factor, which describes the effect of sand blocking on productivity, is proposed. Meanwhile, many experimental works have been done to investigate the sand blocking mechanisms in siltstone reservoirs. From the experimental work, it is concluded that with the increase of displacement PV number and displacement flow rate, the permeability of sand control system decreases by 40%. When solid particles enter the casing and block the gravel and sand control screen in the annulus, the skin factor increases sharply and the productivity decreases by more than 80%. Through the productivity calculation of multilayer sand control wells, it is considered that larger gravel packing radius can keep particles away from the well bore, which is helpful to ensure oil well productivity. Furthermore, the influence of differential filling radius on the fluid production capacity of each layer of sand control well is analyzed. It is proved that optimizing the filling radius of each layer can improve the production effect of mediate- and low-permeability layers. This method has been applied in Kendong #12 block. The daily oil production rate is increased by 9.61 t/day, and the oil recovery of this block is increased by 2.12%.http://dx.doi.org/10.1155/2021/6662571 |
| spellingShingle | Peifeng Jia Chuanzhi Cui Yizhong Zhao Xiukun Wang Yingfei Sui Sand Blocking Mechanisms and Productivity Analysis of Slant Well in Siltstone Reservoirs Geofluids |
| title | Sand Blocking Mechanisms and Productivity Analysis of Slant Well in Siltstone Reservoirs |
| title_full | Sand Blocking Mechanisms and Productivity Analysis of Slant Well in Siltstone Reservoirs |
| title_fullStr | Sand Blocking Mechanisms and Productivity Analysis of Slant Well in Siltstone Reservoirs |
| title_full_unstemmed | Sand Blocking Mechanisms and Productivity Analysis of Slant Well in Siltstone Reservoirs |
| title_short | Sand Blocking Mechanisms and Productivity Analysis of Slant Well in Siltstone Reservoirs |
| title_sort | sand blocking mechanisms and productivity analysis of slant well in siltstone reservoirs |
| url | http://dx.doi.org/10.1155/2021/6662571 |
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