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Clay hydration and swelling can cause shale instability in the drilling of oil and gas wells. The persistent inhibition performance of polyether amine (PEA) and poly(vinyl alcohol- g -dimethyl aminopropyl methacrylamide) (PVA- g -DMAPMA) as amine clay inhibitors has been investigated through hot rolling dispersion test, bulk hardness test, and bentonite inhibition test. The micro-mechanism has also been explained by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscope (SEM), and X-ray diffraction (XRD) analyses. Through the interaction of PEA and PVA- g -DMAPMA, the PEA can enter into clay platelets to exclude water molecules from entering and hydrating the clay, and the PVA- g -DMAPMA can affect the surface of clay minerals to prevent further intrusion of water molecules. Due to the effect of multiple cationic sites, both PEA and PVA- g -DMAPMA can maintain persistent clay inhibition and are less susceptible to reversing the adsorption.

Persistent inhibition performance of amine polymers to inhibit clay swelling