The article is devoted to a new task of forming cargo flows of oil fr om various fields through the system of trunk oil pipelines with the ability to control the rheological properties of the pumped product due to the rational mixing of oil from various fields at the nodal points of the pipeline system – at oil pumping stations with tank farms. The need to set this task is due to the current trend of increasing the share of production of high-viscosity and high-viscosity oils and the urgent need to involve them in the trunk pipeline transport. Its solution allows formation of routes for oil flows from various fields with minimum total energy costs for pumping. To determine the mixing parameters at nodal points, the standard algorithm of multidimensional optimization is proposed as the main calculation module: the simplex method. The target function is represented as total energy consumption for pumping, depending on the concentration of oil mixing at the nodal points of the main oil pipeline system. A method for calculating the target function for any branched network of oil trunk pipelines using algorithms for constructing a mixing tree and determining its properties using a tree traversal algorithm is proposed. The issues of determining the lim it of permissible mixing based on ensuring mass balance and preserving the quality reserve of delivered oil to consumers are also considered. As an example, the problem is solved for an element of a trunk oil pipeline system with four oil mixing nodes in the case of an increase in the oil viscosity of one of the suppliers. Multi-dimensional optimization of energy consumption for this system has revealed the possibility of increasing its energy efficiency by more than 2 %.
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