Abstract
This paper presents the results of CDG nano gel based sandpack flooding, IFT and rheology laboratory measurements. CDGs viscosity had an inverse relation with shear rate, and rheological curve stays invariant after 7 days regardless of NP concentration. Increment of crosslinker concentration had an inverse relation with CDG's viscosity due to colloid collapse (e.g., increase of coil number). Addition of TiO2 NP to Colloidal Dispersion Gels resulted in an increased rheological stability, reduced Interfacial Tension, increased Zeta Potential and increment in RF/RRF values. The critical concentration of NP in CDG was determined. The pseudoplastic behavior, low thermochemical destruction and 35% decrease of IFT in liquid/air interface had been observed. Presence of NPs increased Zeta potential of colloid by 43% as well. RF/RRF values were 173% and 59% more than base CDG solution, respectively. We proposed the kinetic mechanism of colloidal dispersed gels gelation in the presence of TiO2 nanoparticles. Above NP critical concentration, the anionicity of colloid was reduced as a result of diffusive layer shrinkage and the low electrical potential of polymer coils. Moreover, free TiO2 NP becomes available and acts as a bridge between different polymer coils. As a result, attractive forces overtop repulsive forces due to zeta potential scale down; therefore the unstable colloids occur.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
