Title: Experimental study on the viscosity-temperature characteristics and rheological properties of offshore heavy oil

Authors: Meng Cao; Linsong Cheng; Shijun Huang; Yongchao Xue; Mengge Du; Yanwei Yang; Yun Xia; Xiao Chen

Addresses: College of Petroleum Engineering, China University of Petroleum (Beijing), 18 Fuxue Road, Changping, Beijing, 102249, China ' College of Petroleum Engineering, China University of Petroleum (Beijing), 18 Fuxue Road, Changping, Beijing, 102249, China ' College of Petroleum Engineering, China University of Petroleum (Beijing), 18 Fuxue Road, Changping, Beijing, 102249, China ' College of Petroleum Engineering, China University of Petroleum (Beijing), 18 Fuxue Road, Changping, Beijing, 102249, China ' College of Petroleum Engineering, China University of Petroleum (Beijing), 18 Fuxue Road, Changping, Beijing, 102249, China ' College of Petroleum Engineering, China University of Petroleum (Beijing), 18 Fuxue Road, Changping, Beijing, 102249, China ' College of Petroleum Engineering, China University of Petroleum (Beijing), 18 Fuxue Road, Changping, Beijing, 102249, China ' College of Petroleum Engineering, China University of Petroleum (Beijing), 18 Fuxue Road, Changping, Beijing, 102249, China

Abstract: The viscosity-temperature characteristics and rheological properties of heavy oil were investigated experimentally. Experimental results indicate that viscosity is sensitive to temperature, and it is a binary function of temperature and shear rate meeting preferably Arrhenius equation. In addition, the semi-log curve of viscosity-temperature can be divided into three regions and there is no obvious turning point, which exhibits that the internal microstructure of heavy oil during the heating process changes gradually. Besides, activation energy of low temperature range is higher than that of high temperature range. Moreover, the heavy oil always behaves as Newtonian fluid when temperature is higher than crystallisation temperature. Furthermore, on condition that temperature is less than crystallisation temperature, the heavy oil behaves as pseudo-plastic fluid characterising shear thinning phenomenon when shear rate is less than critical shear rate, and it presents as Bingham fluid with yield stress when shear rate falls between 10 and 50 s⁻¹. [Received: March 16, 2018; Accepted: October 24, 2018]

Keywords: offshore heavy oil; viscosity-temperature characteristics; rheological property; activation energy; crystallisation temperature; critical shear rate.

DOI: 10.1504/IJOGCT.2020.108051

International Journal of Oil, Gas and Coal Technology, 2020 Vol.24 No.4, pp.483 - 499

Received: 16 Mar 2018
Accepted: 24 Oct 2018
Published online: 02 Jul 2020 *

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