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- Title
高温油藏聚合物凝胶的制备及其暂堵性能.
- Authors
王刚; 王仕伟; 何丹丹; 卢仁玲; 吴娟; 赖璐
- Abstract
In order to meet the requirement of high-temperature resistance of temporary plugging agent in high temperature-reservoir operation and simplify the process flow of unblocking, under the catalytic effect of inorganic salts, polymer gels was prepared at high temperatures using paraformaldehyde and polyether amines as main raw materials. The effects of temperature and components on the formation time of the polymer gels were investigated, and the mechanical properties and temporary plugging performance of the polymer gels were evaluated by mechanical compression experiments and core displacement experiments. The results showed that there was a slight influence of solvent, paraformaldehyde, and polyetheramine content on the formation time of polymer gels, while the temperature and inorganic salts had a significant effect. The formation time of polymer gels decreased as the temperature increased from 100℃to 160℃. At the temperature of 140℃,the formation time was 65, 50, 25, 20 min, respectively, when the inorganic salts was ZnCl2, CaCl2, NH4Fe (SO4) 2·12H2O and CdCl2·2.5H2O, respectively. Mechanical compression experiments showed that the gels had excellent mechanical strength after cyclic mechanical application under a pressure of 3.57 MPa, the stability of the gells was excellent after aging for 10 days at the temperature of 140℃,and the strength retention rate was more than 95%. The core displacement experiment showed that the gels had excellent blocking performance with a temporary blocking pressure of 5.08 MPa and a breakthrough pressure gradient of 84.00 MPa/m. The gels could be broken within 4 h using 10%hydrochloric acid, and the core permeability recovery rate was higher than 100%after breaking the gel. The ccmcof the gel breaking liquid was 200 mg/L, and γcmcwas 29.80 mN/m, which had good surface activity and could improve the oil-washing efficiency. The obtained high-temperature resistant plugging agent had a significant advantage over conventional plugging agents in terms of plugging performance, and its efficient surface activity of the gel breaking liquid was helpful to other oil recovery processes.
- Subjects
CATALYSIS; RAW materials; TEMPERATURE effect; HIGH temperatures; PERMEABILITY; POLYMER colloids
- Publication
Oilfield Chemistry, 2023, Vol 40, Issue 3, p440
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2023.03.010