The article analyzes the effectiveness of the method for improving the rheology of paraffin oil mixture from the Atyrau – Samara main oil pipeline due to hydrodynamic pulse treatment in a rotary pulse apparatus (RPA). The processed oil was subjected to hydrodynamic pulse impact in the RPA such as pressure and flow rate pulsations, intensive cavitation, vortex formation, and large variable shear loads. The hydrodynamic pulse impact on oil in the RPA allowed, due to the destruction of internal structure, reducing the dynamic viscosity and changing the shape of the flow curves of oil sample compared to untreated oil sample. The oil samples hydro-pulse treatment efficiency was evaluated using dimensionless coefficients showing the ratios of dynamic viscosity before and after treatment, the specific power values required to maintain the oil flow in a rotary viscometer before and after physical impact on oil, and the change ratio of the oil thixotropy energy to the energy spent during treatment process. The efficiency factors of hydrodynamic pulse treatment of paraffin oil are significantly greater than unity, which justifies the prospects of the proposed method. A decrease in the viscosity of the oil mixture from the Atyrau – Samara main oil pipeline is observed more when treated at low temperatures - at 5°C. Thus, the dynamic viscosity at 5°C of the oil sample decreased by more than 1.6 times, the power of maintaining the flow in the rotary viscometer decreased by 2 times, and the efficiency factor of hydrodynamic pulse impact on oil was more than 250. The relaxation time of the rheological parameters of oil was 5 days. Preliminary preparation of thixotropic oils for pumping through main oil pipelines is a promising way to reduce energy costs of transportation.
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