Process and device for optimizing the transfer by pumping of multiphase effluents
AssigneeInstitut Francais du Petrole
InventorEmile Levallois
Life of this patent
Estimating the term…
Abstract
Transfer by pumping of effluents containing at least one gas phase and at least one liquid phase in a transfer line connecting a source of effluents is optimized by interposing on the line, between the source and the point of designation, a multiphase pump. The rotating speed of the pump is regulated so as to adapt the pump flow rate to at least one of the following parameters: flow rate variation well, variation of the volumetric ratio GLR or pressure drop variations occurring in the line during transfer. The values of the parameters are controlled and adjusted to values comparable with the operation of the pump.
Claims14
A device for optimizing the transfer of effluents comprising at least one gas phase and at least one liquid phase by pumping, which device comprises, in combination, means for determining the volumetric ratio at the suction inlet of the pump (GLRa), means for measuring the inlet pressure (Pa) at the inlet of the multiphase pump, means for measuring the delivery pressure (Pref) of the pump, and a programmed processing unit (C) for storing values of GLRa, Pa and Pref and parameter values determined from the start of the transfer, and calculating a new value of the rotating speed (N) of the pump so as to adapt the flow rate of the pump to the variations of at least one of the following three parameters:
- the effluents flow rate, the value of the volumetric ratio (GLRa), or pressure drops downstream from the pump.
A method for optimizing the transfer of effluents comprising at least one gas phase and at least one liquid phase in a transfer line connecting a source of effluents of variable flow rate to a point of designation by pumping, allowing for variations of the volumetric ratio of the gas phase to the liquid phase, as well as pressure drop variations in the line during transfer of the liquid, said method comprising interposing on said line, between the source of effluents and the point of designation, a multiphase pump and regulating the rotating speed of said multiphase pump to adapt the flow rate of said multiphase pump to at least one of said variations;
- the pump applying a compression (.DELTA.P) to the effluents and the rotating speed (N) of the pump being determined by the following parameters:
- the inlet pressure (Pa) at the inlet of the multiphase pump, the volumetric ratio at the suction inlet of the pump (GLRa), the compression (.DELTA.P) applied by the pump and the overall flow rate (Qt) of the effluents produced by said source.
Dependencies are inferred from the claim text.