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A new direction in multiphase flow – early separation. While researching multiphase devices and ways to handle multiphase flow, I came across an interesting patent for an artificial lift system that combines an electrical submersible pump (ESP) and a jet pump (JP) in the same production string. The system has been patented under US patent 6,497,287 by Dr. Augusto Podio, Paulo de Carvalho and Kamy Seehrnoori.
The essence of the design is to impart additional energy to a wellsteam through an ESP, but include a rotary gas separator (RGS) and jet pump to overcome the ESP gas-lock problem. The system is aimed at deepwater offshore wells where wellhead flowing pressures must be maintained at a high level to overcome high frictional losses and hydrostatic head. Such wells must often be shut-in early, which reduces a well's ultimate recovery.
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