DOWNHOLE FLOWMETER Russian patent published in 2003 - IPC

FIELD: well research; applicable in construction of profile of inflow or absorption in wells of low productivity. SUBSTANCE: downhole flowmeter has downhole instrument with holder installed on supports in its body and rotating relative to body with help of electric motor with reducing gear whose output help of electric motor with reducing gear whose output shaft has kinematical connection with holder by means of magnetic coupling, and secondary instrument connected with downhole instrument through logging cable and provided with device for reversing and regulation of rotation speed of electric motor with reducing gear. Fitted inside holder, also on supports, is turbine flowmeter. Located above and below turbine flowmeter are jet-guide grates made in form of screw-shaped blades. Downhole instrument has reed-relay transducer of holder rotation speed and two transducers - reed-relays for determination of speed and direction of turbine rotation. EFFECT: reduced lower limit of measurement. 4 dwg