Preparation of a fluid diversion agent for profile control in elevated temperature and high salinity reservoirs

作者：Pingde Liu, Weitao Li, Falin Wei, Futang Hu, Xiuyu Zhu, Zhiwei Jia · 发表于：Journal of Applied Polymer Science · 年份：2021 · DOI：10.1002/app.50875 · 被引用次数：9 · 研究领域：Enhanced Oil Recovery Techniques、Petroleum Processing and Analysis、Hydraulic Fracturing and Reservoir Analysis

Abstract To improve the thermal stability of organic polymer gels applied for profile control in elevated temperature and high salinity reservoirs, a temperature‐tolerant, and salt‐resistant polymer CP (AM‐AMPS‐PPAM) was synthesized using acrylamide, 2‐acrylamido‐2‐methylpropane‐sulfonic acid, and 4‐propylphenylacrylamide.The effect of component weight percentage on CP (AM‐AMPS‐PPAM) properties was investigated, and its structure was characterized by Fourier transform infrared spectroscopy and scanning electron microscope. The rheological properties of CP (AM‐AMPS‐PPAM) were also investigated. The results showed that CP (AM‐AMPS‐PPAM) has high apparent viscosity at different temperatures. Based on CP (AM‐AMPS‐PPAM), phenolic resin (PF), and a thermal stabilizer (TSA), a fluid diversion agent for profile control in elevated temperature and high salinity reservoirs was prepared. The optimized formula for the fluid diversion agent was as follows: 0.4–0.5 wt% CP (AM‐AMPS‐PPAM) + 0.3–0.4 wt% PF + 0.2–0.3 wt% TSA. In high salinity formation water, the apparent viscosity of the fluid diversion agent was greater than 1.2 × 10 4 mPa·s, with a gelation time of 5 to 30 h at 115°C and retention rate of the apparent viscosity of greater than 85% for 90 days. The results indicate that the diversion agent exhibited good thermal stability.