Abstract:

The metering and controlling of down hole flow have become an important and indispensable technology in oilfield development and the intelligent oilfield technology，the correlative data which are measured by them can provide a reliable theoretical basis for the production and management of the oilfield.Bases on the metering technology of three phase mixed measurement the working principles of the down hole Venturi flow measurement is introduced in this paper，the working process discussed and a new flow measurement device which can adapt to the complex down hole environment developed，especially，the calculation of the hardware part clearly derived.This device，whose structure is simple，no plugin is needed，no interference with the fluid flow with a little pressure loss，it is not apt to be affected by the change of fluid properties，is easy to install，safe and reliable，high in precision and suitable for down hole flow measurement and control.

Key words: downhole, flow measurement, structure, Venturi, oilfield development