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Retrievable downhole flow meter

A well has a downhole flow meter that is installed in a sub in a string of tubing. The flow meter has a body having an external profile that lands on a landing profile in the sub. The body has a passage with a throat area of reduced diameter. Upstream and downstream body ports in a side wall of the body are in fluid communication with the throat area and a downstream portion of the passage downstream of the throat area. Seals are located between the body and the sub, defining an upstream annular chamber and a downstream annular chamber surrounding the body, the chambers being in communication with the upstream and downstream body ports. Upstream and downstream sub ports in a side wall of the sub are in fluid communication with the upstream and downstream chambers. A sensor circuit is in operative engagement with the sub ports for determining a flow rate based on a pressure difference sensed between the throat area and the downstream portion of the passage in the body.

Software correction method and apparatus for a variable orifice flow meter

A method of improving the accuracy of a variable orifice flow meter that includes characterizing the discharge coefficient of the flow meter orifice for different orifice openings and for different differential pressures. The method may be particularly useful with a flow metering and controlling device that includes a fluid flow conduit having at least one planar inner wall and an element having a linear edge configured to mate with the at least one planar inner wall of the fluid flow conduit. The element is movable relative to the conduit to define a flow orifice and vary a cross-sectional area of the orifice. The device also includes a processor configured to calculate the fluid flow based on the cross-sectional area of the orifice, the differential pressure, and the discharge coefficient.

Wedge and wedge unit for use in ultrasonic doppler flow meter

A wedge unit according to the present invention is used for an ultrasonic Doppler flow meter, being mounted on the outer wall of a pipe in which a fluid flows, supplying an ultrasonic wave to the fluid, receives the reflected wave and supplies the reflected wave to a flow rate calculation unit, comprises a wedge with one surface thereof being mounted on a part of the outer circumference of the pipe and on another surface thereof being equipped with an ultrasonic oscillator that generates the ultrasonic wave in response to an electric signal and receives the reflected wave; and an ultrasonic wave attenuation unit being mounted on the outer circumference of the pipe so as to include a position where an ultrasonic wave injected from the ultrasonic oscillator into the pipe by way of the wedge first reaches the outer wall of the pipe after being reflected by the inner wall thereof.

Scalable averaging insertion vortex flow meter

An insertion vortex flow meter for measuring a flow rate of a process fluid in a pipe has a mounting assembly, a shedding bar and a sensor assembly. The mounting assembly is attached to a surface of the pipe adjacent an opening in a side wall of the pipe. The shedding bar is inserted through the opening and extends an entire diameter of the pipe. The shedding bar is held in place by a compression force exerted by the sensor assembly on a proximal end of the shedding bar, such that the shedding bar is held by the compressive force between the sensor assembly and an opposing side wall of the pipe. The sensor assembly is adapted to measure motion of a pivoting element corresponding to vortices in the process fluid caused by the shedding bar. The sensor assembly adapted to produce an output indicative of the volumetric flow rate based on the frequency of the measured motion.


Retrievable downhole flow meter
Capacitative electromagnetic flow meter
Ultrasonic flow meter with reduced noise
Coriolis mass flow meter having a thick-walled measuring tube
Detector for an ultrasonic flow meter
Karman vortex flow meter
Coriolis mass flow meter employing non-metallic flow conduit structure
Fluidic volumetric fluid flow meter
Electromagnetic flow meter
Fluid flow meter utilizing pressure sensing
Air flow meter
Fluid flow meter
Liquid flow meter construction
Positive displacement flow meter method and apparatus
Magnetic-inductive flow meter with a measuring tube made of plastic


PAT. NO. Title
1 7086294 Retrievable downhole flow meter
2 7082842 Software correction method and apparatus for a variable orifice flow meter
3 7077012 Wedge and wedge unit for use in ultrasonic doppler flow meter
4 7073394 Scalable averaging insertion vortex flow meter
5 7069793 Ultrasonic flow meter and ultrasonic sensor
6 7069157 Heat sensitive flow meter and fuel controller
7 7058521 Low power ultrasonic flow meter
8 7034937 Flow meter
9 7027936 Methods for measuring flow by means of an ultra sonic flow meter
10 7024944 Ultrasonic flow meter
11 7021136 Mass flow meter with symmetrical sensors
12 7004037 Flow meter device
13 6997033 Flow meter pickoff assembly and flow meter pickoff adjustment method for nulling flow meter zero offset
14 6996485 Nullification of measurement error, particularly within a dual turbine flow meter used in a fuel dispenser
15 6993979 Multiphase mass flow meter with variable venturi nozzle
16 6983663 Flow meter arrangement
17 6978683 Ultrasonic flow meter
18 6973841 High pressure retention vortex flow meter with reinforced flexure
19 6973839 Electromagnetic flow meter having processing means resolving output data into a non-flow waveform component
20 6971274 Immersible thermal mass flow meter
21 6968283 Gas flow meter
22 6962087 Electromagnetic flow meter
23 6959611 Flow meter having a rebounding plate with a filter assembly
24 6955194 Protected integral cylinder valve, gas pressure regulator and flow meter, and method for refilling a gas cylinder so equipped
25 6938611 Flow meter
26 6938497 Acoustic flow meter in the form of a valve key
27 6935191 Fuel dispenser fuel flow meter device, system and method
28 6923055 Positive displacement flow meter method and apparatus
29 6920799 Magnetic flow meter with reference electrode
30 6915242 Evaluating a vortex flow-meter signal
31 6904793 Air flow meter
32 6901813 Flow meter alarm device
33 6898987 Flow meter
34 6889564 Peak flow meter
35 6883388 Self-cleaning flow meter having adjacent inlet and outlet fluid flow passageways
36 6883370 Mass flow meter with chip-type sensors
37 6874480 Flow meter
38 6865957 Adaptable fluid mass flow meter device
39 6860988 Fluid filtration system with fluid flow meter
40 6860325 Downhole flow meter
41 6854342 Increased sensitivity for turbine flow meter
42 6845704 Beverage making system with flow meter measurement control and method
43 6834241 Programmable coriolis flow meter electronics for outputting information over a single output port
44 6832179 Evaluating a vortex flow-meter signal
45 6830080 Output control for turbine vapor flow meter
46 6829948 Flow meter
47 6821093 Flow meter
48 6810345 Gas flow meter
49 6807868 Coriolis mass flow meter
50 6805013 Coriolis mass flow meter having a thin-walled measuring tube

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