Study of Janus Amphiphilic Graphene Oxide as a High-Performance Shale Inhibitor and Its Inhibition Mechanism

摘要

The Janus amphiphilic graphene oxide (JAGO) modified by the dodecylamine in one side of graphene oxide (GO) was investigated for its novel use as a shale inhibitor. JAGO was synthesized through the pickering emulsion template technology and was characterized by Fourier-transform infrared spectra, UV-vis spectra and transmission electron microscopy. Compared with potassium chloride (5%), polyether diamine (2%), and the pristine GO (0.2%), the highest shale recovery rate (75.2% at 80 °C) and the lowest swelling height of Mt-pellets (2.55 mm) in JAGO (0.2%) demonstrated the excellent inhibitive property of JAGO. Furthermore, JAGO also greatly reduced the filtration loss as a perfect plugging agent. Based on the results of X-ray diffraction, contact angle measurements and pressure transmission tests, we proposed that the 2D nano-sheet amphiphilic structure of JAGO, which enable JAGO to be effective both in chemical inhibition and physical plugging, was responsible for its remarkable inhibition performances.