High-Temperature Resistant and Environmentally Friendly Drilling Fluid Treatment Agent

During the drilling process, high-temperature environments can cause the performance of traditional drilling fluids to decline, affecting drilling efficiency and environmental protection. To address this issue, this study added polymetallic hydroxide to anti-temperature and environmentally protective drilling fluid treatment agents, verifying its performance through linear expansion experiments, anti-expansion experiments, mud ball experiments, and thermogravimetric analysis.The experimental results indicate that at 20 minutes, the expansion rate of bentonite is 44.2% in water and 22.3% in KCl, and at 120 minutes, the expansion rate is 70.4% in water and 50.4% in KCl. When mixing different polymetallic hydroxides with bentonite clay, M1-Fe exhibited the lowest swelling among Fe-doped polymetallic hydroxide samples, with rates of 13.3% at 20 minutes and 22.7% at 120 minutes. Among Cu-doped samples, M2-Cu showed the lowest expansion, at 15.9% at 20 minutes and 25.3% at 120 minutes. For Zn-doped samples, M3-Zn had the lowest expansion rates, at 16.5% at 20 minutes and 27.3% at 120 minutes.The results demonstrate that Fe-doped polymetallic hydroxide samples exhibit excellent swelling inhibition and thermal stability at high temperatures. These samples significantly improve the high-temperature stability and environmental performance of drilling fluids, showing great potential for widespread use in high-temperature drilling.