Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel System
We targeted high-temperature and highly saline old oil fields, whose environmental conditions could be attributed to the significantly high heterogeneity cause by long-term water flooding. The Huabei Oilfield was chosen as the research object. We developed a hydrophobic functional monomer–polymer wi...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/7/3125 |
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| author | Jiqiang Zhi Yikun Liu Jinfeng Chen Lifeng Bo Guohui Qu Nan Jiang Weizhong He |
| author_facet | Jiqiang Zhi Yikun Liu Jinfeng Chen Lifeng Bo Guohui Qu Nan Jiang Weizhong He |
| author_sort | Jiqiang Zhi |
| collection | DOAJ |
| description | We targeted high-temperature and highly saline old oil fields, whose environmental conditions could be attributed to the significantly high heterogeneity cause by long-term water flooding. The Huabei Oilfield was chosen as the research object. We developed a hydrophobic functional monomer–polymer with temperature and salt resistance by introducing the temperature-resistant and salt-resistant monomer NVP and a hydrophobic functional monomer into the main chain for copolymerization. We used a crosslinking agent with phenolic resin to prepare a weak gel system that showed temperature and salt resistance and investigated its temperature and salt resistance, infective property, plugging performance, liquid flow ability, micropore throat migration, and plugging characteristics. The results obtained using the infrared spectroscopy technique revealed the successful preparation of the phenolic resin crosslinker. The weak gel exhibited good temperature and salt resistance when the polymer concentration was 2000 mg/L, the cohesion ratio was 1:1.5, the additive concentration was 2000 mg/L, the reservoir temperature was 120 °C, and the injected water salinity was 40,300.86 mg/L. The average viscosity retention rate of the 90-day weak gel reached more than 80% and its microstructure was examined. The coreflow experiment results revealed that the weak gel system was characterized by good infectivity. After plugging the weak gel, the effect on the direction of the liquid flow was evident and the flow rate of the low permeability layer increased to a maximum of 48.63% under conditions of varying permeability levels. A significant improvement in the water absorption profile was achieved. The plugging was carried out through a sand-filling pipe under varying permeability conditions and the pressure measuring points in the sand-filling pipe were sucessfully pressurized. The migration ability of the weak gel was good and the blocking rate was >85%. |
| first_indexed | 2024-03-11T05:29:50Z |
| format | Article |
| id | doaj.art-84fb39da0a074121aaa93f531c9f3034 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T05:29:50Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-84fb39da0a074121aaa93f531c9f30342023-11-17T17:13:54ZengMDPI AGMolecules1420-30492023-03-01287312510.3390/molecules28073125Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel SystemJiqiang Zhi0Yikun Liu1Jinfeng Chen2Lifeng Bo3Guohui Qu4Nan Jiang5Weizhong He6School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, ChinaSchool of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, ChinaSchool of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, ChinaSchool of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, ChinaSchool of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, ChinaSchool of Electrical Engineering & Information, Northeast Petroleum University, Daqing 163318, ChinaSchool of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, ChinaWe targeted high-temperature and highly saline old oil fields, whose environmental conditions could be attributed to the significantly high heterogeneity cause by long-term water flooding. The Huabei Oilfield was chosen as the research object. We developed a hydrophobic functional monomer–polymer with temperature and salt resistance by introducing the temperature-resistant and salt-resistant monomer NVP and a hydrophobic functional monomer into the main chain for copolymerization. We used a crosslinking agent with phenolic resin to prepare a weak gel system that showed temperature and salt resistance and investigated its temperature and salt resistance, infective property, plugging performance, liquid flow ability, micropore throat migration, and plugging characteristics. The results obtained using the infrared spectroscopy technique revealed the successful preparation of the phenolic resin crosslinker. The weak gel exhibited good temperature and salt resistance when the polymer concentration was 2000 mg/L, the cohesion ratio was 1:1.5, the additive concentration was 2000 mg/L, the reservoir temperature was 120 °C, and the injected water salinity was 40,300.86 mg/L. The average viscosity retention rate of the 90-day weak gel reached more than 80% and its microstructure was examined. The coreflow experiment results revealed that the weak gel system was characterized by good infectivity. After plugging the weak gel, the effect on the direction of the liquid flow was evident and the flow rate of the low permeability layer increased to a maximum of 48.63% under conditions of varying permeability levels. A significant improvement in the water absorption profile was achieved. The plugging was carried out through a sand-filling pipe under varying permeability conditions and the pressure measuring points in the sand-filling pipe were sucessfully pressurized. The migration ability of the weak gel was good and the blocking rate was >85%.https://www.mdpi.com/1420-3049/28/7/3125temperature and salt toleranceweak gel preparationprofile controlfluid flow directionplugging performance |
| spellingShingle | Jiqiang Zhi Yikun Liu Jinfeng Chen Lifeng Bo Guohui Qu Nan Jiang Weizhong He Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel System Molecules temperature and salt tolerance weak gel preparation profile control fluid flow direction plugging performance |
| title | Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel System |
| title_full | Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel System |
| title_fullStr | Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel System |
| title_full_unstemmed | Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel System |
| title_short | Preparation and Performance Evaluation of a Temperature and Salt Resistant Hydrophobic Associative Weak Polymer Gel System |
| title_sort | preparation and performance evaluation of a temperature and salt resistant hydrophobic associative weak polymer gel system |
| topic | temperature and salt tolerance weak gel preparation profile control fluid flow direction plugging performance |
| url | https://www.mdpi.com/1420-3049/28/7/3125 |
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