The structure and application of amine‐terminated hyperbranched polymer shale inhibitor for water‐based drilling fluid

Abstract

Amine‐terminated hyperbranched polymer (HBP‐NH2), as an inhibitor in water‐based drilling fluid, is prepared by the polycondensation of diamine AB2 monomers. The primary amine and secondary amide structures are confirmed by Fourier transform infrared spectroscopy and nuclear magnetic resonance hydrogen spectroscopy. Through time of flight mass spectrometry, the molecular weight of HBP‐NH2 is mainly distributed in the range of 200–1400. Also, the quasi‐spherical shape and the high temperature resistance (200 °C) performance of HBP‐NH2 are, respectively, certified through the environmental scanning electron microscope and the thermogravimetric analysis. In the inhibition performance test, the linear expansion rate of sodium bentonite in 3 wt % HBP‐NH2 aqueous solution is only 11.42%, which is lower than other inhibitors (KCl, FA‐367, and HPAM). Zeta potential analysis shows that HBP‐NH2 has a strong ability to inhibit the hydration and dispersion of sodium bentonite by protonated primary amine groups. Compared with the base slurry, the absolute value of zeta potential is reduced by 25.5 mV in the slurry containing 3 wt % HBP‐NH2 at 180 rpm. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45466.

Structure and inhibition properties of a new amine‐terminated hyperbranched oligomer shale inhibitor

“…Lots of inhibitors have been reported to inhibit the hydration of shale, including inorganic salts and linear polymers contained inhibition groups . For amine inhibitors, linear polymers such as alkylamines, poly(oxyalkyl)amines, and poly(oxypropylene)amidoamine are successfully used in water‐based drilling fluid.…”

“…Compared with linear polymer, hyperbranched polymer has a unique branched structure and more terminal groups to become the potential inhibitor. Bai et al . proposed that synthetic hyperbranched polyamidoamine efficiently inhibit the hydration of shale through its scores of terminal primary amine groups, its linear expansion rate of shale core is much lower than those of other traditional inhibitors.…”

“…Bai et al . and Zhong et al . focused on the inhibition performance of polyamidoamine but ignored to describe the interaction between hyperbranched polymer and shale comprehensively.…”

The Structure and Properties of a Novel Hydroxyl‐Terminated Hyperbranched Polymer for Inhibiting Shale Hydration

“…After treatment by β‐CD‐HBP‐OH, the stretching vibration of ‐CH 2 ‐ was appeared at 2917 cm −1 and 2848 cm −1 . Bai et al . reported this phenomenon to indicate the successful adsorption of organic inhibitors to sodium bentonite.…”

“…The smaller hydrodynamic radius contributes to less molecular chain entanglement to avoid unnecessary interaction with other linear polymer additives in drilling fluid formulation. Hyperbranched polyamidoamine has been reported to improve the shale recovery rate with latent toxicity. Considering the environmental requirement for water‐based drilling fluid, hyperbranched polyglycerols can be considered as potential shale inhibitors.…”