In the frame of new technologies for artificial lifting of hydrocarbon streams, a relevant place can be taken by multiphase ejectors. These systems are characterized by a simple structural design, absence of moving parts and small dimensions, which allow easy installation and management procedures during fields operations, coupled with a high degree of reliability and low cost of installation, compared with other boosting systems. These capabilities have a cost to be paid, due to the complexity of the fluid dynamic design. The high velocities and the large pressure drops needed for an efficient use of multiphase ejectors, give significant modeling problems, increased by fluid properties changes during fluid evolution. To cope with all these problems and extend the operative life of the ejector, an advanced multiphase ejector has been developed in order to optimise some of the main geometrical parameters (as nozzle diameter, mixing tube length and so on) to improve the ejector performances at varying operative conditions. In this paper, the realization and field application of this multiphase ejector are described.

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