DOWN-HOLE FLOWMETER SENSOR Russian patent published in 2014 - IPC E21B47/10 G01F1/10 

FIELD: measurement equipment.

SUBSTANCE: invention refers to devices for determination of fluid rate and flow direction. down-hole flowmeter sensor containing a housing, tachometric transducer installed in housing including transducer housing, impeller with shaft located in supports with a gap, mechano-electric transducer of impeller rotation installed in transducer housing and being its motionless element in transducer housing as well as being moving element on impeller shaft, protection unit including caps installed on supports one of which is transducer housing, and protective atmosphere source in the form of capsule, to which transducer housing cap is connected. As protective atmosphere, used is protective fluid not mixing with borehole fluid and having less density. Capsule is installed in sensor housing, at that volume of protective fluid in it is not less than volume of transducer housing cap. Capsule is designed as a syringe with spring loaded piston in its housing, which underpiston volume is connected to volume of transducer housing cap. Piston is designed with possibility of contact with its lock installed on curved plate outside capsule housing, designed with possibility of interaction with float moving in capsule housing.

EFFECT: obtaining down-hole flowmeter sensor reliably operating in contaminated borehole fluids at various unrestricted depth of its downwelling in borehole and its hydrodynamic investigations.

3 cl, 4 dwg