Effect Of Geometrical Parameters On The Performance Of A Multiphase Ejector Available to Purchase

In the frame of new technologies for boosting hydrocarbon streams, a relevant place can be taken by multiphase ejectors or jet pumps. The ejectors are characterized by a simple design, small dimensions, no moving parts, coupled with a high degree of reliability and low cost. The main disadvantages related to the use of multiphase ejectors are determined by their low efficiency and low rangeability. The efficiency of an ejector decreases in particular when the working conditions diverge from the design conditions. The ejector rangeability affects the use of ejectors in oil and natural gas production fields, due to the time changing characteristics of wells, owing to, for instance, natural depletion or water cut and GOR increase. The ejector rangeability can be enhanced using replaceable internals, which is the method used by ENI E&P at present. However this simple solution cannot be applied for cases such as sub sea applications. For these reasons the development of a variable asset multiphase ejector (VAME), which allows the geometry to be modified from outside, can be of a great interest for hydrocarbon boosting applications. This paper presents the results of an experimental activity during which the dependence of an ejector performance from its geometrical parameters was investigated. The most important design parameters are the nozzle diameter, the nozzle to mixing chamber distance, the mixing chamber diameter and the mixing chamber length. The experimental results have shown a significant dependence of ejector performances to the nozzle diameter, nozzle to mixing chamber distance and mixing chamber diameter