Electronics-free flow sensor downhole in a wellbore

Abstract

Techniques described herein involve an electronics-free downhole flow sensor. For example, a system can include a receiver positioned at a surface of a wellbore. A flow sensor can be positioned downhole in the wellbore. The flow sensor can include a wire positioned within a flow path of downhole fluid in the wellbore. The wire can oscillate based on flow of the downhole fluid. The flow sensor can also include a variable reluctance sensor that can detect an electrical signal that is generated by oscillation of the wire. The variable reluctance sensor can transmit the electrical signal to the receiver. The receiver may determine a resonant frequency based on the electrical signal and may determine a fluid velocity of the downhole fluid based on the resonant frequency.

Dependencies are inferred from the claim text.