Axial-flow and centrifugal pumping system
AssigneeInstitut Francais du Petrole
InventorsChristian Wittrisch, Marcel Arnaudeau, Eric Vandenbroucke
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Abstract
A system for compressing a multi-phase fluid made up of at least one gaseous phase and at least one liquid phase, the system having at least one pair of pumping elements. The system includes an axial-flow pump P1 and a centrifugal pump P2 arranged after the axial-flow pump P1. The two elements are linked by an element which adjusts the fluid from the axial-flow pump to optimize the effect of the centrifugal pump.
Claims7
A pumping system for compressing a multi-phase fluid comprising at least one gaseous phase and at least one liquid phase, the system having in combination at least one pair of pumping elements, comprising:
- a first pumping means P1 of the axial-flow type for pumping the multi-phase fluid and for achieving at least one of imparting power to the multi-phase fluid, reducing the proportion of gaseous phase initially present in the multi-phase fluid, and mixing the gaseous and liquid phases, in order to obtain a first fluid F1 with a power E1 at the outlet of the first pumping means P1,
- a second pumping means P2 of the centrifugal type provided downstream of and operably connected to the said first pumping means P1 for imparting to the said first fluid F1 from the first pumping means P1 a sufficient pressure value to convey it from one location to another, and
- adjusting means arranged between the outlet of the said first pumping means P1 and the inlet of the said second pumping means P2 for adjusting the fluid F1 in readiness for the second pumping means P2,
- wherein the first pumping means P1 has several stages, each of the stages having an impeller and an adjuster, the second pumping means P2 having at least one series of centrifugal hydraulics comprising an impeller and an adjuster, and wherein the adjusting means has geometric characteristics of the outlet relative to the inlet to optimize transfer of the fluid F1 to the second pumping means P2, and
- wherein an angle of entry .alpha. of the fluid F1 into the adjusting means relative to a plane perpendicular to an axis of the rotation shaft is within a range between 10 and 30.degree. and an angle of exit .beta. of the fluid F1 from the adjusting means relative to the plane perpendicular to the axis of the rotation shaft is 90.degree.+/-10.degree..
A pumping system for compressing a multi-phase fluid comprising at least one gaseous phase and at least one liquid phase, the system having in combination at least one pair of pumping elements, comprising:
- a first pumping means P1 of the axial-flow type for pumping the multi-phase fluid and for achieving at least one of imparting power to the multi-phase fluid, reducing the proportion of gaseous phase initially present in the multi-phase fluid, and mixing the gaseous and liquid phases, in order to obtain a first fluid F1 with a power E1 at the outlet of the first pumping means P1,
- a second pumping means P2 of the centrifugal type provided downstream of and operably connected to the said first pumping means P1 for imparting to the said first fluid F1 from the first pumping means P1 a sufficient pressure value to convey it from one location to another, and
- adjusting means arranged between the outlet of the said first pumping means P1 and the inlet of the said second pumping means P2 for adjusting the fluid F1 in readiness for the second pumping means P2,
- wherein the first pumping means P1 has several stages, each of the stages having an impeller and an adjuster, the second pumping means P2 having at least one series of centrifugal hydraulics comprising an impeller and an adjuster, and wherein the adjusting means has geometric characteristics of the outlet relative to the inlet to optimize transfer of the fluid F1 to the second pumping means P2, and
- wherein a ratio Di/De of flow diameters Di of the inlet of the adjusting means to De of the outlet of the adjusting means is within a range between 1.8 and 2.5.
A pumping system, for compressing a multi-phase fluid comprising at least one gaseous phase and at least one liquid phase, the system having in combination at least one pair of pumping elements, comprising:
- a first pumping means P1 of the axial-flow type for pumping the multi-phase fluid and for achieving at least one of imparting power to the multi-phase fluid, reducing the proportion of gaseous phase initially present in the multi-phase fluid, and mixing the gaseous and liquid phases, in order to obtain a first fluid F1 with a power E1 at the outlet of the first pumping means P1,
- a second pumping means P2 of the centrifugal type provided downstream of and operably connected to the said first pumping means P1 for imparting to the said first fluid F1 from the first pumping means P1 a sufficient pressure value to convey it from one location to another, and
- adjusting means arranged between the outlet of the said first pumping means P1 and the inlet of the said second pumping means P2 for adjusting the fluid F1 in readiness for the second pumping means P2,
- wherein the first pumping means P1 has several stages, each of the stages having an impeller and an adjuster, the second pumping means P2 having at least one series of centrifugal hydraulics comprising an impeller and an adjuster, and wherein the adjusting means has geometric characteristics of the outlet relative to the inlet to optimize transfer of the fluid F1 to the second pumping means P2, and
- wherein the rotation shaft further comprises drawing-off and re-injecting means for drawing off at least a proportion of high-pressure fluid and means for re-injecting the drawn-off portion on a level with one or more adjusters of the first pumping means P1 in order to lubricate the bearing or bearings associated with the one or more adjusters.
Dependencies are inferred from the claim text.