A method of locally determining the nature of a phase in a three-phase fluid, and application for determining flow parameters of the fluid.

摘要

In order to determine the flow parameters of a three-phase fluid which e.g. in a hydrocarbon producing well, may be constituted for example by a continuous water phase together with discontinuous phases of oil and of gas in the form of bubbles, a local sonde (40a) is used for identifying the phases present. The sonde (40a) comprises two sensors (42a, 44) which are responsive to different physical properties of the fluid and which are situated at substantially the same point, in such a manner as to provide a different set of signals for each of the phases. The sensors may comprise, in particular a radiofrequency sensor and an optical sensor disposed coaxially therewith at the end of a coaxial cable (42a) whose core comprises a metal-coated optical fiber (44).