Study on Viscoelastic Behaviors of Waxy Crude Water-in-Oil Emulsion
- 1 College of Petroleum Engineering, Northeast Petroleum University, Daqing, China
- 2 College of Petroleum Engineering, Northeast Petroleum University, Daqing, China
- 3 College of Petroleum Engineering, Northeast Petroleum University, Daqing, China
Abstract
Emulsion of waxy crude oil is one of the common states in the subsea pipeline. At low temperatures in offshore environment, waxy crude oils with water could form the crude oil emulsion gel of oil-in-water emulsion. Thus, the waxy crude oil emulsion viscoelastic behavior for deep sea transportation and restarting pipeline safety is particularly important. By means of MASIII HAAKE rheometer which is produced by German company, waxy crude oil emulsion viscoelastic behavior is explored at different volumetric water contents and different shear stresses. By analyzing the rate of change of shear rate in the initial stage, the influence rules of viscoelastic properties were summarized, with the change of volumetric water content and the applied shear stress and based on the experimental results, the law of emulsion is explained from the micro level. It is proposed that brittle fracture exists between wax crystals, and flexible fracture was found in the interaction between water droplets and wax crystals.
- Golczynski, T.S. and Kempton, E.C. (2006) Understanding Wax Problems Leads to Deepwater Flow Assurance Solutions. World Oil, 227, 7-10.
- Oliveira, M.C.K., Carvalho, R.M., Carvalho, A.B., et al. (2010) Waxy Crude Oil Emulsion Gel: Impact on Flow Assurance. Energy & Fuels, 24, 2287-2293. http://dx.doi.org/10.1021/ef900927g
- Gafonova, O.V. and Yarranton, H.W. (2001) The Stabilization of Water-in-Hydrocarbon Emulsions by Asphaltenes and Resins. Journal of Colloid and Interface Science, 241, 469-478. http://dx.doi.org/10.1006/jcis.2001.7731
- Spiecker, P.M., Gawrys, K.L., Trail, C.B., et al. (2003) Effects of Petroleum Resins on Asphaltene Aggregation and Water-in-Oil Emulsion Formation. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 220, 9-27. http://dx.doi.org/10.1016/S0927-7757(03)00079-7
- Yang, X., Verruto, V.J. and Kilpatrick, P.K. (2007) Dynamic Asphaltene-Resin Exchange at the Oil/Water Interface: Time-Dependent W/O Emulsion Stability for Asphaltene/Resin Model Oils. Energy & Fuels, 21, 1343-1349. http://dx.doi.org/10.1021/ef060465w
- Guo, L.P., Wang, L. and Song, Y.B. (2011) Study on Yield Characteristics of Waxy Crude Water-in-Oil Emulsion. Science Technology and Engineering, 18, 4372-4376.
- Visintin, R.F.G., Lockhart, T.P., Lapasin, R., et al. (2008) Structure of Waxy Crude Oil Emulsion Gels. Journal of Non-Newtonian Fluid Mechanics, 149, 34-39. http://dx.doi.org/10.1016/j.jnnfm.2007.07.008
- Sun, G.Y. (2015) Study on Structural Characteristics of Waxy Crude Oil Emulsion Gels. China University of Petroleum, Beijing.
- Hou, L. and Zhang, J.J. (2005) Experimental Study on Viscoelasticity of Daqing Crude Oil. Acta Petrolei Sinica, 26, 109-112.
- Guo, L.P., Chen, X., Wang, Y., Shi, S., Yu, X.Y. and Wang, X. (2015) Study on Gelation Properties of Waxy Crude Water-in-Oil Emulsion. Contemporary Chemical Industry, 8, 1740-1742.
- Chen, G.Q. (2003) Rheology of Wax Containing near the Condensation Point of the Crude Oil and Its Application. China University of Petroleum, Beijing.
- Haj-Shafiei, S., Ghosh, S. and Rousseau, D. (2013) Kinetic Stability and Rheology of Wax-Stabilized Water-in-Oil Emulsions at Different Water Cuts. Journal of Colloid and Interface Science, 410, 11-20. http://dx.doi.org/10.1016/j.jcis.2013.06.047