US 11,656,187 B2
Microwave doppler flowmeter for hydrocarbon wells
Eric Donzier, Bercheres sur Vesgre (FR); Linda Abbassi, Katy, TX (US); and Emmanuel Tavernier, Paris (FR)
Assigned to OPENFIELD, Versailles (FR)
Filed by OPENFIELD, Versailles (FR)
Filed on Dec. 18, 2020, as Appl. No. 17/127,725.
Claims priority of application No. FR1914973 (FR), filed on Dec. 19, 2019.
Prior Publication US 2021/0190558 A1, Jun. 24, 2021
Int. Cl. G01N 22/00 (2006.01); G01F 1/663 (2022.01); G01F 1/74 (2006.01)
CPC G01N 22/00 (2013.01) [G01F 1/663 (2013.01); G01F 1/74 (2013.01)] 33 Claims
OG exemplary drawing
 
1. A flowmeter of a downhole tool adapted for displacement along and within a hydrocarbon well and intended for use within the hydrocarbon well for measuring a fluid velocity and/or a fluid direction of a moving multiphase fluid present in the hydrocarbon well, including:
a microwave front end module comprising at least one transmit antenna and at least one receive antenna and a microwave circuit, the microwave circuit comprising an oscillator coupled to the transmit antenna for causing said antenna to transmit microwave signals towards the multiphase fluid at a high frequency ranging from 10 to 100 GHz, a mixer coupled to the receive antenna and to a filter for generating an analog in-phase doppler signal depending on microwave signals returned from moving multiphase fluid;
an analog electronics module comprising an amplifier and an analog-to-digital converter converting the analog doppler signal successively into an amplified analog doppler signal and a digital doppler signal;
a digital processing module comprising a Fast Fourier Transform algorithm for processing the digital doppler signal into a Doppler frequency spectrum and a filter providing a compressed Doppler frequency spectrum, said Doppler spectrum containing information indicative of the fluid velocity and/or the fluid direction of the moving multiphase fluid; and
a protective shell protecting the microwave front end module, the analog electronics module and the digital processing module from multiphase fluid, the protective shell comprising a first part positioned over said antennas and being transparent to microwave signals, and a second part being opaque to microwave signals.