Effects of Nano-SiO2 Addition in Drilling Fluid on Wear Behavior of 2Cr13 Steel Casing
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This work studied the effects of nano-SiO2 addition in drilling fluid on the wear behavior of casing. The disc specimens and pin specimens were made of 2Cr13 steel and G105 steel, respectively, and the water-based drilling fluids added with different amount of nano-SiO2 were tested, based on which, the wear rate, surface morphology, surface profile, and composition of the wear product were analyzed. Results showed that, the main wear mechanism of 2Cr13 steel casing in the drilling fluid is abrasive–corrosive wear. Adding nano-SiO2 to the drilling fluid can significantly reduce the casing wear. As the nano-SiO2 concentration increases, the wear rate and mean friction coefficient both increase first and then decrease. Drilling fluid shows best lubrication performance when the nano-SiO2 concentration is 2%. The shielding effect of nano-SiO2 can slow down the vicious cycle of “oxidation–destruction–reoxidation” during the wear process. Microhardness of tribofilms increases when adding more nano-SiO2 into drilling fluid, which increases the wear resistance of disc surfaces. However, the excessive addition of nano-SiO2 on a 2% concentration basis can lead to the decrease in bonding strength between tribofilms and matrix, leading to large delamination on the disc surface and therefore reducing the shielding effect of nano-SiO2.
KeywordsNano-SiO2 2Cr13 steel casing Wear Lubrication effect
Transmission electron microscopy
Energy-dispersive X-ray spectroscopy
Scanning electron microscope
The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (51604235). China National Science and Technology Major Project “Changning-Weiyuan shale gas development demonstration project” (2016ZX05062), and Sichuan Science and Technology Project (2019YFS0045).
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