Colloidal dispersion nanogels for in-situ fluid diversion

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...

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Bibliographic Details
Published in:	Journal of petroleum science & engineering Vol. 193; p. 107411
Main Authors:	Suleimanov, Baghir A., Veliyev, Elchin F., Azizagha, Aliyev A.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-10-2020
Subjects:	Colloid stability Colloidal dispersion gels In-situ fluid diversion Nanoparticles Residual resistivity factor Resistivity factor Zeta potential Nanoparticles Colloidal dispersion gels In-situ fluid diversion Zeta potential Residual resistivity factor Colloid stability Resistivity factor
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Summary:	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. •Addition of TiO2 NP to CDG resulted in increased rheological stability, reduced interfacial tension and increment in RF/RRF values.•Presence of NPs increases zeta potential of colloid by 43% .•Free TiO2 NP becomes available and acts as a bridge between different polymer coils.
ISSN:	0920-4105 1873-4715
DOI:	10.1016/j.petrol.2020.107411