Rheological behavior and particle suspension capability of guar gum: sodium tetraborate decahydrate gels containing cellulose nanofibrils
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Guar gum (GG) fracturing fluids were studied by incorporating cellulose nanofibrils (CNFs) in anhydrous borax crosslinked guar gum gels. To fully understand the impact of CNF on the proppant suspension capability of developed fracturing fluids, their shear rate-dependent viscosity and viscoelasticity were investigated. The shear rate dependencies of fluids was fitted to the Carreau model. The zero shear rate viscosity and elasticity of fracturing fluids increased significantly by incorporating CNF in guar gum gels. On the other hand, the viscosity at high shear rates (>100 s−1) decreased as desired. The proppant settling velocities through fracturing fluids were evaluated by modeling the terminal falling velocity of proppants moving through a Carreau model fluid. The experimental results of the rheological behavior and the modeling results of the proppant settling rate indicated that the fracturing fluids containing CNF had better suspension capabilities. In addition, the lower viscosities of CNF formulated GG gels at higher shear rates will make them more pumpable.
KeywordsGuar gum Borax crosslinked Fracturing fluid Cellulose nanofibrils Proppant settling
This research was funded by Alberta Innovates Bio Solutions and NSERC Bioconversion Network. We thank the National Institute for Nanotechnology and Alberta Innovates-Technology Futures for providing training and research equipment.
- Acharya A (1987) Viscoelasticity of crosslinked fracturing fluids and proppant transport. In: SPE production operations symposium. Society of Petroleum EngineersGoogle Scholar
- Asadi M, Shah SN, Lord DL (1999) Static/dynamic settling of proppant in non-newtonian hydraulic fracturing fluids. In: SPE mid-continent operations symposium. Society of Petroleum EngineersGoogle Scholar
- Asadi M, Conway MW, Barree RD (2002) Zero shear viscosity determination of fracturing fluids: an essential parameter in proppant transport characterizations. In: International symposium and exhibition on formation damage control. Society of Petroleum EngineersGoogle Scholar
- Chhabra RP (1993) Bubbles, drops, and particles in non-Newtonian fluids. CRC Press, Boca RatonGoogle Scholar
- Gidley JL (1989) Recent advances in hydraulic fracturing. Society of Petroleum Engineers, Richardson, TXGoogle Scholar
- Harris PC, Morgan RG, Heath SJ (2005) Measurement of proppant transport of frac fluids. In: SPE annual technical conference and exhibition. Society of Petroleum EngineersGoogle Scholar
- Hu YT, Chung H, Maxey JE (2015a) What is more important for proppant transport, viscosity or elasticity? In: SPE hydraulic fracturing technology conference. Society of Petroleum EngineersGoogle Scholar
- Hu YT, Kishore T, Maxey J, Loveless D (2015b) Effects of crosslinking chemistry on proppant suspension in guar networks. In: SPE international symposium on oilfield chemistry. Society of Petroleum EngineersGoogle Scholar
- Lei C, Clark PE (2004) Crosslinking of guar and guar derivatives. In: SPE annual technical conference and exhibition. Society of Petroleum EngineersGoogle Scholar
- Pääkkö M, Ankerfors M, Kosonen H, Nykänen A, Ahola S, Österberg M, Ruokolainen J, Laine J, Larsson PT, Ikkala O (2007) Enzymatic hydrolysis combined with mechanical shearing and high-pressure homogenization for nanoscale cellulose fibrils and strong gels. Biomacromolecules 8(6):1934–1941CrossRefGoogle Scholar
- Roodhart L (1985) Proppant settling in non-Newtonian fracturing fluids. In: SPE/DOE low permeability gas reservoirs symposium. Society of Petroleum EngineersGoogle Scholar