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Etude de l'efficacité diphasique d'une pompe pour la compression du CO2

Abstract : IFPEN (French Institute of Petroleum and New Energy) develops, since the 80's, a type of multiphase axial rotodynamic pump for the transport of crude oil and natural gas in a single pipeline. This is now a well established technology used by many companies. Now, IFPEN wishes to extend the scope of these so-called "Poséidon" multiphase pumps to the CO2 compression aiming at an injection in the deep saline aquifers or in the depleted oil and gas reservoirs. Like all pumps and compressors, these pumps are characterized by the pressure rise and the performance as a function of the flow rate, for a given rotation speed. In the case of two-phase pumps, we usually need an additional parameter called 'two-phase efficacy'. IFPEN defines this efficiency as the ratio of the real and the ideal pressure gains (i.e. the pressure increase that would suffer the considered homogeneous fluid with a density equivalent to that of a well known two-phase mixture). This additional parameter should quantify the loss of pressure gain due to the gas presence. The literature shows that the loss of performance is due to an accumulation of the dispersed phase in a specific area of the rotor channels. The physical phenomena involved is relatively well described and it is recognized that the key parameters involved in the degradation are related to the size of the gas particles and the drag force acting on them. Given the balance of forces governing the flow, the evolution of gas bubbles are different in radial machines and axial machines. Different works are on the modelling of these flows using 3D numerical simulations especially in the radial machines. They are generally used to check the behaviour of the bubbles between the blades. However, none of them provides an assessment of the pump performance degradation, and although attempts exist, they are acceptable at the nominal operating point and for very low rates of gas. Our aim is to determine the behaviour of the two-phase efficacy, especially as a function of the pump geometric parameters, of the fluid parameters (especially for the CO2), and the operating conditions at the pump inlet. It would be necessary to clearly define the mechanisms responsible for the loss of performance of two-phase pumps. To achieved this point, we have assumed that the two-phase efficacy reflects both heterogeneity of liquid/gas mixture and a modification of the flow close to the trailing edge of the pump stages as a result of slippage between the continuous phase and the dispersed phase. The aim of our work is to quantify these effects, particularly those from the flow angular changes bat the trailing edge of the blades of the pump impellers.
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Contributor : El Mifdol Mohamed <>
Submitted on : Friday, April 6, 2012 - 11:42:01 PM
Last modification on : Thursday, February 21, 2019 - 10:33:56 AM
Long-term archiving on: : Saturday, July 7, 2012 - 2:38:39 AM

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El Mifdol Mohamed. Etude de l'efficacité diphasique d'une pompe pour la compression du CO2. Mécanique des fluides [physics.class-ph]. Arts et Métiers ParisTech, 2012. Français. ⟨NNT : 2012ENAM0011⟩. ⟨pastel-00686069⟩

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