Application of MJPs in Oil&Gas Fields

ENI E&P in 1993 launched an R&D project on production boosting using multiphase jet pumps. In these devices a high pressure oil or gas well can be used to enhance both the production and the total recovery from a depleted well. The multiphase ejector is characterized by a simple design, absence of moving parts and small dimensions, coupled with a high degree of reliability and low cost. The main disadvantages related to the use of multiphase ejectors are due to the lack of reliable design methods and to the sharp decrease of the performance when operative conditions change. In the last three years the ejector technology can be considered a standard for ENI resulted in several successful installations worldwide: -West Africa (onshore oil wells)-GOM (offshore, condensate gas )-Italy and Mediterranean Sea (onshore and offshore, wet and dry gases) In the present work a status of these installations is reported, pointing out the following main items: -design and installation peculiarities-predicted and measured performances-optimisation actions performed during the considered period The results of this review have been used to identify the new strategies on ejector design and operability, which will be also reported. In particular, new design to increase productivity and component operability life is described, together with laboratory test results