Purpose. To improve the simulation method of kinematic parameters distribution for mixed flows in a flowing part of a downhole jet pump. Methodology. There is developed an analytical model for distribution of flow kinematic parameters in the mixing chamber of a downhole jet pump as potential flows and the turbulent layer between them with an uneven velocity profile, which is approximated using basic functions. Integrated analysis techniques for interaction of asymmetric flooded turbulent jets are applied during simulation. Findings. There is analyzed a structure of the flow at the mixing chamber inlet of the jet pump by applying the theory of a flooded jet of fluid that moves in the accompanying flow. A possibility of simulating the process of the jet pump mixing is presented. There is also shown a possibility of simulating the mixing process of coaxial flows as self-similar velocities profiles of potential and shear flows of the variable section with a three-layer structure. There is accepted a uniform velocity profile for the areas of potential flows while a non-linear profile is accepted for the shear flow, placed between them. These profiles retain an approximate self-similarity during the entire initial area of a submerged jet. Integration of the accepted velocity profile with regard to the conditions of the transition between potential and shear flows allows determining the uneven distribution of kinematic parameters for mixed flows in a flowing part of a downhole jet pump. Originality. The novelty of this research article is to establish the relationship between self-similar velocities profiles of potential and shear flows of the variable structure, boundaries of the mixed flows and mutual orientation of elements in a flowing part of the jet pump. Practical value. The presented method for estimating the unevenness of the velocity profile in the mixing chamber of the jet pump allows taking into account the design and operational characteristics of the well bore ejection system when designing the distribution of kinematic parameters of the mixed streams. The established relationship between uneven distribution of velocities and the ratio of flows to mixed streams, geometric sizes and mutual orientation of elements can be used for designing structures and predicting the operating conditions of the well borehole pump.

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