Measuring and testing – Volume or rate of flow – Of selected fluid mixture component
Patent
1985-08-30
1989-04-04
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Of selected fluid mixture component
73200, G01F 174
Patent
active
048174394
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a process and a device for measuring the feed of the liquid and gaseous phases of a two-phase flowing liquid
Devices for pumping a two-phase fluid comprising a mixture of a liquid and a gas not dissolved in the liquid are already known, for example from. French patent application No. 79 31031 FR(2,471,501). However, these devices only operate satisfactorily for values of the feeds of the two phases and the volumetric ratio of the gaseous phase to the liquid phase (GOR), in thermodynamic flow conditions, between certain limits depending on the geometry and the kinematics of the device. Consequently regulating appliances are used which can ensure relatively constant feeds and volumetric ratios at the entrance to the pump.
To enable the operation of these regulating appliances, it is therefore necessary to measure precisely the values of the feed of each of the two phases and the volumetric ratio of the two-phase liquid upstream.
This invention aims to provide a process and a device enabling such measures to be carried out.
For this purpose, the scope of the invention is a process for measuring the feed of the liquid and gaseous phases of a two-phase fluid during flow, characterised in that the two-phase fluid is rotated around a longitudinal axis so as to generate a coaxial flow having a tubular layer formed from the gaseous phase surrounded by a tubular layer formed from the liquid phase., in that downstream from the zone where the said two-phase fluid has been rotated are measured on the one hand the thicknesses of the tubular layers of the liquid phase and gaseous phase and, on the other hand, the flow velocity of at least the liquid phase, and in that from the thickness and velocity values measured are determined, by comparison with mathematical and/or experimental models, the feed relating to volume and mass of each phase and also the volumetric ratio of the gaseous phase and the liquid phase under the thermodynamic conditions of the two-phase fluid.
These measures may be carried out in any suitable way, for example by the hot wire method or using a Pitot tube, but the thickness of the respective layers is preferably determined by measuring the differential absorption of radiation .gamma. in the said phases , and the flow velocities by Doppler effect.
In certain cases when this process is implemented the volumetric ratio is great, and the thickness of the liquid layer is then very small. The precision of the measurements can then be improved further if, for a short period of time, the thickness of the liquid layer is increased. This can be done by carrying out the measurements after adding to the flow of two-phase fluid a feed of liquid, in particular water, which is predetermined and/or by modifying the rotational velocity of the two-phase fluid.
In a particular embodiment of the invention measurements of thickness and velocity are carried out at predetermined intervals and the said admission of additional liquid and/or the modification of the rotational velocity of the fluid is caused when the current values for the thickness of the layers and/or the flow velocity deviate from the average corresponding values previously measured.
The scope of the invention is also a device for implementing the above process, characterised in that it comprises an exterior fixed tubular enclosure, a longitudinal axial shaft arranged in the said enclosure and connected to means enabling its rotation at determined variable velocities, a tubular enclosure mounted coaxially to the interior of the external enclosure and capable of being brought into rotation jointly with the said shaft, the said interior enclosure extending over one part only of the length of the exterior enclosure, means for introducing a two-phase fluid into the said exterior enclosure and means for removing two-phase fluid from the exterior enclosure down-stream from the interior enclosure, the exterior enclosure comprising, in a zone between the down-stream extremity of the interior enclosure and the said removal means, means for
REFERENCES:
patent: 4282760 (1981-08-01), Pitts, Jr. et al.
patent: 4312234 (1982-01-01), Rhodes et al.
Arnaudeau Marcel
Rousset Philippe
501 Institut Francais du Petrole
Goldstein Herbert
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