Experimental analysis of acidizing in Weizhou X low permeability reservoir
Abstract Aiming at the problem of increased water injection pressure and poor water injection effect during the water injection operation of Weizhou X offshore low permeability oil reservoir. The cause of clogging was clarified using cast thin section experiments, water quality compatibility experim...
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| Format: | Article |
| Language: | English |
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Wiley
2024-11-01
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| Series: | Engineering Reports |
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| Online Access: | https://doi.org/10.1002/eng2.12905 |
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| author | Yi Zhang Bin Zhang Feng Wei Hongjun Lu Banghua Liu Mingguang Tang PengYu Zhu Rui Wang Jian Yan |
| author_facet | Yi Zhang Bin Zhang Feng Wei Hongjun Lu Banghua Liu Mingguang Tang PengYu Zhu Rui Wang Jian Yan |
| author_sort | Yi Zhang |
| collection | DOAJ |
| description | Abstract Aiming at the problem of increased water injection pressure and poor water injection effect during the water injection operation of Weizhou X offshore low permeability oil reservoir. The cause of clogging was clarified using cast thin section experiments, water quality compatibility experiments and reservoir sensitivity experiments, and corresponding deblocking agents were configured based on the experimental results. The experimental results show that Weizhou X oilfield has strong velocity sensitivity (damage rate 85.35%) and strong salt sensitivity (damage rate 63.02%), and there is a phenomenon of water quality incompatibility. Analysis shows that the excessive velocity of the injected water causes the core particles to fall off and the water quality is incompatible with the calcium carbonate precipitation to cause pore throat blockage as the fluid migrates to the small roar, which is the main reason for the increase in water injection pressure. Based on the analysis results, the acid solution formula was optimized and determined to be: 12% HCl + 0.5% HF + 3% CH3COOH + 0.5% C6H12N4. Indoor test results show that the acid has good clay swelling prevention and reservoir modification effects, and the average reservoir modification rate is 129.21%. The plug‐removing effect is remarkable and can be promoted in similar oil fields. |
| format | Article |
| id | doaj-art-0b3e7eac060549e18db15dc2506c67fc |
| institution | OA Journals |
| issn | 2577-8196 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Engineering Reports |
| spelling | doaj-art-0b3e7eac060549e18db15dc2506c67fc2025-08-20T02:18:35ZengWileyEngineering Reports2577-81962024-11-01611n/an/a10.1002/eng2.12905Experimental analysis of acidizing in Weizhou X low permeability reservoirYi Zhang0Bin Zhang1Feng Wei2Hongjun Lu3Banghua Liu4Mingguang Tang5PengYu Zhu6Rui Wang7Jian Yan8Shaanxi Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoirs Xi'an Shaanxi ChinaShaanxi Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoirs Xi'an Shaanxi ChinaDevelopment Department of Zhanjiang Branch of CNOOC (China) Zhanjiang Guangdong ChinaOil and Gas Technology Research Institute of Changqing Oilfield Branch of CNPC Xi'an Shaanxi ChinaCNPC Production & Operation Management Department Beijing ChinaDevelopment Department of Zhanjiang Branch of CNOOC (China) Zhanjiang Guangdong ChinaSchool of Petroleum Engineering Xi'an Shiyou University Xi'an Shaanxi ChinaShaanxi Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoirs Xi'an Shaanxi ChinaShaanxi Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoirs Xi'an Shaanxi ChinaAbstract Aiming at the problem of increased water injection pressure and poor water injection effect during the water injection operation of Weizhou X offshore low permeability oil reservoir. The cause of clogging was clarified using cast thin section experiments, water quality compatibility experiments and reservoir sensitivity experiments, and corresponding deblocking agents were configured based on the experimental results. The experimental results show that Weizhou X oilfield has strong velocity sensitivity (damage rate 85.35%) and strong salt sensitivity (damage rate 63.02%), and there is a phenomenon of water quality incompatibility. Analysis shows that the excessive velocity of the injected water causes the core particles to fall off and the water quality is incompatible with the calcium carbonate precipitation to cause pore throat blockage as the fluid migrates to the small roar, which is the main reason for the increase in water injection pressure. Based on the analysis results, the acid solution formula was optimized and determined to be: 12% HCl + 0.5% HF + 3% CH3COOH + 0.5% C6H12N4. Indoor test results show that the acid has good clay swelling prevention and reservoir modification effects, and the average reservoir modification rate is 129.21%. The plug‐removing effect is remarkable and can be promoted in similar oil fields.https://doi.org/10.1002/eng2.12905acidizingexperimental resultslow permeability reservoirplug removalreservoir damage |
| spellingShingle | Yi Zhang Bin Zhang Feng Wei Hongjun Lu Banghua Liu Mingguang Tang PengYu Zhu Rui Wang Jian Yan Experimental analysis of acidizing in Weizhou X low permeability reservoir Engineering Reports acidizing experimental results low permeability reservoir plug removal reservoir damage |
| title | Experimental analysis of acidizing in Weizhou X low permeability reservoir |
| title_full | Experimental analysis of acidizing in Weizhou X low permeability reservoir |
| title_fullStr | Experimental analysis of acidizing in Weizhou X low permeability reservoir |
| title_full_unstemmed | Experimental analysis of acidizing in Weizhou X low permeability reservoir |
| title_short | Experimental analysis of acidizing in Weizhou X low permeability reservoir |
| title_sort | experimental analysis of acidizing in weizhou x low permeability reservoir |
| topic | acidizing experimental results low permeability reservoir plug removal reservoir damage |
| url | https://doi.org/10.1002/eng2.12905 |
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