B - Operations – Transporting – 01 – F
Patent
B - Operations, Transporting
01
F
B01F 3/04 (2006.01) C10C 3/00 (2006.01) F17D 1/16 (2006.01) F17D 1/17 (2006.01)
Patent
CA 2550406
It is postulated that the blending formula for the viscosity of two products such as bitumen and diluent is not a continuous function of the diluent amount, as has been proposed by all theories to date, but is instead a discontinuous series of at least three log-linear functions, each representing a different phase, as the fluid transitions through the three different primary phases; gas/liquid, liquid/liquid, and solid/liquid. The log viscosity of a blend of a high vapour pressure natural gas liquid (HVP-NGL) and a heavy oil can be expressed as a simple sum of the relative mole weighting of the log viscosities of the two individual materials, as measured between the phase change boundaries. The liquid/liquid phase over the middle range of diluent % mole defines the primary range of utility in pipelines when utilizing heavy oil, as this oil usually requires at least 15 mole % to reduce the viscosity to the specification, and one must avoid asphaltine deposition beyond 85 mole % for operational reasons. This is based on the observation that sharp discontinuities in viscosity are usually caused by phase changes. Where a phase is constant, the graph of log viscosity vs. blend mole % composition is approximately linear. It is also postulated that this curve fit is similar across a range of diluents from ethane to pentanes and possibly heavier products all the way through to light cycle oil, implying that (say) 50 mole % propane provides a similar viscosity reduction as 50 mole % pentane for any particular oil.
Altex Energy Ltd.
Borden Ladner Gervais Llp
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