Analysis of dependence of maximum values of the jet pump efficiency on the main geometric parameter suggests that limit values of efficiency are within the range of values of the parameter K_(jp) =2-6. In result of the investigations performed it was established that maximum energy efficiency of utilization of an mechanism designed for washing of sand plugs may be achieved in the course of utilization of the jet pump, for which balance of cross sectional areas of mixing chamber and work jet nozzle is equal to 4.94. It is necessary to utilize this balance in the course of designing of the jet pumps that are included to the ejection system intended for removal of sand from the well.
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