Influence of nanomaterial morphology of guar-gum fracturing fluid, physical and mechanical properties.

Nanosilica, multiwalled carbon nanotubes and graphite powder have different effects on guar gum fracturing fluid because of the different morphologies of these nanomaterials. The results showed that the apparent viscosity, temperature tolerance, elastic modulus and tensile strength of nano-hybrid guar gum fracturing fluids were improved by nanomaterials compared to those properties of blank fracturing fluid (without nanomaterials). However, microscopic analysis by SEM and TEM revealed that different nanomaterials played different roles in the network structure of guar gum fracturing fluid. In terms of micro particle size, modified nano-SiO2 (M-NS) played a nuclear point and skeleton role in the fracturing fluid and obviously enhanced the network structure. Hydroxylated multiwalled carbon nanotubes (MWNTs-OH) and guar gum macromolecular chains were intertwined. Graphene oxide (GO) intercalation entered the guar gum molecular chain and the interaction was relatively weak because of its sheet structure.