Rheology, curing temperature and mechanical performance of oil well cement: Combined effect of cellulose nanofibers and graphene nano-platelets. (15th January 2017)

• Record Type: Journal Article
• Authors: Sun, Xiuxuan; Wu, Qinglin; Zhang, Jinlong; Qing, Yan; Wu, Yiqiang; Lee, Sunyoung
• Is Part Of: Materials & design. Volume 114(2017)
• Page Start: 92
• Page End: 101
• Publication Date: 2017-01-15
• Subjects: Nanocellulose -- Graphene nanoparticle -- Oil-well cement -- Rheology -- Curing -- Strength; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.10.050
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Cellulose nanofibers (CNFs) were prepared through acid hydrolysis and used in combination with graphene nano-platelets (GNPs) as modifiers for oil well cement (OWC). The rheology behavior of CNF/GNP-OWC slurries at three temperatures (i.e., 20, 40, and 60 °C) was measured and modeled using four different rheological models. Thermal properties, surface functional groups, morphology, and mechanical performance of the composites were characterized. CNF/GNP-OWC slurry exhibited a typical shear-thinning behavior with reduced shear viscosity at higher shear rates. The use of CNFs and GNPs led to increased yield stresses of fresh CNF/GNP-OWC slurry and temperature significantly influenced the yield stress values. Among these rheology models, the Vom Berg model exhibits the best fitting result of the slurry rheology data (R 2 = 0.999). The addition of CNFs and GNPs increased degree of hydration (DOH) value of CNF/GNP-OWC composites. Both flexural and compressive strengths of the CNF/GNP-OWC composites were enhanced with added CNFs and GNPs. The reinforcing mechanism was attributed to the increased DOH, reduced pores, and bridging effect of CNFs and GNPs in the composites. Graphical abstract: Highlights: Cellulose nanofibers (CNFs) and graphene nanoplatelets (GNPs) reinforced oil well cement (OWC) composites were prepared and characterized. Vom Berg model provided the best fitting to measured rheology data of OWC slurry. CNFs and GNPs enhanced flexural and compressive strengths of OWC.