Abstract
The lubricity of drilling fluid resistant to high-temperature over 200 ℃ is still one of the technological breakthroughs. In this study, the graphene modified with sodium dodecylbenzene sulfonate (SDBS) was selected as a resistant to high-temperature lubricant. Our results show that the drilling fluids have high stability after aging at 240 °C with the assistance of the SDBS/graphene. Excitingly, the tribological performance test results revealed that the SDBS/graphene exert excellent anti-friction and anti-wear properties. Compared with the base slurry, the friction coefficient and wear rate of the SDBS/graphene slurry are reduced by 76% and 59%, respectively. The deposited film composed of graphene, Al2O3, SiO2, Fe2O3, FeSO4 actualized the protection of the sliding contact zone, proving that the sulfonate group on the SDBS/graphene contributed to prompt the deposition of the graphene and bentonite and then enhanced tribological properties of the drilling fluids. Overall, the graphene modified with SDBS is expected to solve the difficulty to form effective deposited film and poor lubricity of the drilling fluid under high-temperature.
Highlights
During the drilling and extraction process of ultra-deep wells, the contact between the drilling pipe and casing made the casing severe worn[1, 2] and increased the power consumption[3]
The deposited film composed of graphene, Al2O3, SiO2, Fe2O3, FeSO4 actualized the protection of the sliding contact zone, proving that the sulfonate group on the sodium dodecylbenzene sulfonate (SDBS)/graphene contributed to prompt the deposition of the graphene and bentonite and enhanced tribological properties of the drilling fluids
After adding the prepared graphene, the zeta potential value of the drilling fluid is -158.70 mV, which shows that the prepared graphene had high dispersion in water-based drilling fluids
Summary
During the drilling and extraction process of ultra-deep wells, the contact between the drilling pipe and casing made the casing severe worn[1, 2] and increased the power consumption[3]. Carbon based lubricants have been widely uesd in water-based drilling fluids for their excellent properties such as high temperature resistance, non fluorescence and good lubrication performance. There is still a lack of effective lubrication activity in water-based drilling fluids.We prepared SDBS/graphene by a shear exfoliation assisted with supercritical carbon oxide (SC-CO2) fluid[18]. The SDBS/graphene prepared by supercritical carbon dioxide would present potential resistance to high temperature lubrication performance in water-based drilling fluid. We developed a new strategy by introducing the SDBS/graphene into water-based drilling fluid to effectively antifriction and antiwear at room temperature of 25 °C and at increased temperature of 240 °C. The prepared graphene presents excellent the tribological behaivors to inhibit friction and wear under aging at high temperature of 240 °C. Our design holds great promise for high temperature resistant drilling fluid lubricant additives
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