DETERMINATION OF THE CAVITATION CHARACTERISTICS OF A WELL JET PUMP
DOI:
https://doi.org/10.31471/1993-9868-2026-2(46)-120-128Keywords:
jet pump, ejection system, injected flow, cavitation, flow swirlAbstract
The research aims to develop an algorithm to determine the characteristics of the ejection system in the event of cavitation in the mixing chamber of the jet pump, when flows are swirled by inclined guide elements in its flow part. To this end, a hydraulic relationship was established between the minimum pressure in the jet pump's flow section, its geometric dimensions, the well's design and flushing mode. The limiting operational characteristics of downhole jet pumps were determined and the influence of the inclination angle of the elements in the jet pump's flow section on the ejection system's cavitation characteristics was investigated. Using the Bernoulli equation, an analytical dependence was obtained to determine the influence of design and operating parameters on the minimum pressure value at the mixing chamber inlet. This ratio is presented in the form of calculation algorithms that determine the pre-cavitation operating conditions of the ejection system, including the maximum permissible flow rate of the working stream, the minimum permissible depth of the jet pump in the well and the minimum permissible cross-sectional area of the injected stream at the inlet to the mixing chamber. The relative rotational motion of the mixed streams was taken into account using a coefficient that accounts for the uneven distribution of longitudinal velocities caused by the swirling of the stream due to inclined guide elements placed in the flow part of the jet pump. Studies have shown that the angle of inclination of the guide elements in the flow part of the jet pump has an inverse effect on the maximum permissible flow rate of the working stream, while this parameter has a direct proportional effect on the minimum permissible depth of placement of the ejection system in the well. The improved calculation algorithm allows to increase the accuracy of predicting the operating mode of a downhole jet pump and to increase the efficiency of its use. Determining the field of permissible characteristics of a downhole jet pump helps ensure the reliability of its operation.
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