Carboxylated cellulose nanofibrils (R-CNFs) as an additive in water based drilling fluids (WBMs) applied to shale formations

YURANY A.VILLADA-VILLADA; MARÍA CELESTE IGLESIAS; JUNYONG ZHU; NATALIA CASIS; MARÍA SOLEDAD PERESÍN; DIANA ESTENOZ

Philadelphia

Encuentro; ACS Spring 2020 National Meeting & Exposition; 2020

ACS Spring

This work proposes the application of di-carboxylic acid cellulose nanofibrils (DCA-CNFs) obtained through maleic acid hydrolysis as an additive in water based drilling fluids (WBMs). Specifically, the use of DCA CNFs as a replacement of xanthan gum (XGD) in the WBM formulations was evaluated. The effect of DCA-CNFs on the main functional properties of WBMs and their performance was evaluated and compared with that corresponding to XGD. To this end, interactions between DCA-CNFs and bentonite (BT), as well as between DCA-CNFs and polyanionic cellulose (PAC), were studied using quartz crystal microbalance with dissipation monitoring (QCM-D) technique. The rheological analyses showed a shear thinning behavior of WBMs containing XGD similar to WBMs with DCA-CNFs, while filtration properties and thermal stability improved by the presence of DCA-CNFs. Results obtained by QCM-D indicated higher interaction between PAC and DCA-CNFs when compared to BT and DCA-CNFs. The Sisko model was implemented to simulate the relationship between viscosity and shear rate. WBM for Argentina shale containing the double concentration of DCA-CNFs exhibited similar rheological properties to the base fluid.