Effect of a Modified Silicone as a Thickener on Rheology of Liquid CO₂ and Its Fracturing Capacity.

ABSTRACT: The low viscosity of pure liquid CO₂ hindered the development of CO₂ fracturing technology. A modified silicone polymer was prepared as a CO₂ thickener to investigate the effect of temperature, pressure, shear rate and thickener content (wt.%) on the apparent viscosity and rheology of thickened liquid CO₂. In addition, CO₂ fracturing capacity was evaluated with the numerical simulation of extended finite element. The results displayed that an apparent viscosity of up to 1.3 mPa·s at 303 K and 18 MPa was attained over liquid CO₂ using the thickener of 3 wt.% and Toluene of 9 wt.% as additives. Compared to the commercial linear polydimethylsiloxane, a better apparent viscosity was obtained from the mixture of this prepared thickener, Toluene and CO₂. The apparent viscosity decreases with inc

SUBMITTER: Li Q 

PROVIDER: S-EPMC6473470 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature