CA2381891A1 - Flow rate measurement using unsteady pressures - Google Patents

Flow rate measurement using unsteady pressures Download PDF

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Publication number
CA2381891A1
CA2381891A1 CA002381891A CA2381891A CA2381891A1 CA 2381891 A1 CA2381891 A1 CA 2381891A1 CA 002381891 A CA002381891 A CA 002381891A CA 2381891 A CA2381891 A CA 2381891A CA 2381891 A1 CA2381891 A1 CA 2381891A1
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Prior art keywords
pressure
pipe
vortical
signal
velocity
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Granted
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CA002381891A
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French (fr)
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CA2381891C (en
Inventor
Daniel L. Gysling
Rebecca S. Mcguinn
Charles R. Winston
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Weatherford Technology Holdings LLC
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Individual
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Publication of CA2381891A1 publication Critical patent/CA2381891A1/en
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Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
    • G01F1/708—Measuring the time taken to traverse a fixed distance
    • G01F1/7086—Measuring the time taken to traverse a fixed distance using optical detecting arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
    • G01F1/708—Measuring the time taken to traverse a fixed distance
    • G01F1/712—Measuring the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/74—Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid

Abstract

Flow rate measurement system includes two measurement regions (14, 16) located an average axial distance .DELTA.X apart along the pipe (12), the first measurement region (14) having two unsteady pressure sensors (18, 20), located a distance X1 apart, and the second measurement region (16), having two other unsteady pressure sensors (22, 24), located a distance X2 apart, each capable of measuring the unsteady pressure in the pipe (12). Signals from each pair of pressure sensors (18, 20) and (22, 24) are differenced by summers (44, 54), respectively, to form spatial wavelength filters (33, 35), respectively. Each spatial filter (33, 35) filters out acoustic pressure disturbances Pacoustic and other long wavelength pressure disturbances in the pipe (12) and passes short-wavelength low-frequency vortical pressure disturbances Pvortical associated with the vortical flow field (15). The spatial filters (33, 35) provide signals Pas1, Pas2 to band pass filterS (46, 56) that filter out high frequency signals. The Pvortical-dominated filtered signals Pasf1, Pasf2 from the two regions (14, 16) are cross-correlated by Cross-Correlation Logic (50) to determine a time delay ~ between the two sensing locations (14, 16) which is divided into the distance .DELTA.X to obtain a convection velocity Uc(t) that is related to an average flow rate of the fluid (i.e., one or more liquids and/or gases) flowing in the pipe (12). The invention may also be configured to detect the velocity of any desired inhomogeneous pressure field in the flow.

Claims (33)

1. An apparatus for measuring a velocity of a fluid moving in a pipe (12), comprising:
a first filter (33) which measures a vortical pressure field at a first axial location (14) along the pipe (12) and provides a first pressure signal indicative of said vortical pressure field; and a second filter (34) which measures said vortical pressure field at a second axial location (16) along the pipe (12) and provides a second pressure signal indicative of said vortical pressure field;
a signal processor (40), responsive to said first and said second pressure signals, which provides a velocity signal indicative of a velocity of the said vortical pressure field moving in the pipe (12).
2. The apparatus of claim 1 wherein said velocity signal is related to a velocity of said fluid moving in said pipe (12).
3. The apparatus of claim 1 wherein said velocity signal is indicative of the velocity of said fluid moving in said pipe (12).
4. The apparatus of claim 1 further comprising a volumetric flow meter wherein said signal processor (40) provides a flow signal indicative of the volumetric flow rate of said fluid flowing in said pipe (12).
5. The apparatus of claim 1, wherein said first and said second filters (33, 35) filter out wavelengths associated with an acoustic pressure field and passes wavelengths associated with said vortical pressure field.
6. The apparatus of claim 5, wherein said first filter (33) comprises a first spatial filter; and said second filter (34) comprises a second spatial filter.
7. The apparatus of claim 1, wherein said vortical pressure field comprises an inhomogeneous pressure field.
8. The apparatus of claim 7, wherein said first and said second filters (33, 35) filter out wavelengths associated with an acoustic pressure field and passes wavelengths associated with said inhomogeneous pressure field.
9. The apparatus of claim 6, wherein said first and second spatial filters filter out wavelengths above a predetermined wavelength.
10. The apparatus of claim 6, wherein said first and second spatial filters filter out wavelengths above a predetermined wavelength and frequencies below a predetermined frequency.
11. The apparatus of claim 6, wherein:
said first spatial filter comprises at least a first and a second unsteady pressure sensors disposed a predetermined first distance (x1) apart from each other;
and said second spatial filter comprises at least a third and a fourth unsteady pressure sensors disposed a predetermined second distance (x2) apart from each other.
12. The apparatus of claim 11 wherein said at least one of said pressure sensors (18-24) comprises a strain gage disposed on a surface of the pipe (12).
13. The apparatus of claim12 wherein said surface is an outer surface of said pipe (12).
14. The apparatus of claim 11 wherein said at least one of said pressure sensors (18-24) comprises a fiber optic pressure sensor.
15. The apparatus of claim 14 wherein fiber optic pressure sensor comprises at least one Bragg grating (310-324; 360-368; 370-376).
16. The apparatus of claim12 wherein said strain gage comprises a fiber optic strain gage.
17. The apparatus of claim 16 wherein said fiber optic strain gage comprises at least one Bragg grating (310-324; 360-368; 370-376).
18. The apparatus of claim 1 wherein said signal processor (40) comprises logic (50) which calculates a cross-correlation between said first and said second inhomogeneous pressure signals and provides a time delay signal (.TAU.) indicative of the time it takes for said vortical pressure field to move from said first location to said second location.
19. The apparatus of claim 18 wherein said signal processor (40) comprises logic responsive to said time delay signal (i) which provides an inhomogeneous velocity signal indicative of the velocity of said vortical pressure field moving in said pipe (12).
20. The apparatus of claim 18 wherein said signal processor (40) comprises logic responsive to said time delay signal (.TAU.) which provides said velocity signal indicative of the velocity of said fluid moving in said pipe (12).
21. The apparatus of claim 1 wherein said signal processor (40) comprises filter logic (46, 56) responsive to said first and said second pressure signals, which filters out a predetermined range of frequencies.
22. The apparatus of claim 21 wherein said filter logic (46, 56) comprises a band pass filter.
23. A method for measuring a velocity of a fluid moving in a pipe (12), the method comprising:
a) measuring a vortical pressure held at a first location along the pipe (12) and providing a first vortical pressure signal indicative of said vortical pressure field;
b) measuring said vortical pressure field at a second location along the pipe (12) and providing a second vortical pressure signal indicative of said vortical pressure field, said first and said second locations being an axial distance (.DELTA.x) apart; and c) calculating the velocity using said first and said second vortical pressure signals.
24. The method of claim 23, wherein said calculating step (c) comprises:
d) calculating a cross-correlation of said first and said second pressure signals to obtain a time delay signal ~ indicative of the time it takes for said vortical pressure field to move from said first location to said second location.
25. The method of claim 24, wherein said calculating step (d) comprises:
e) calculating a velocity signal from said time delay signal ~.
26. The method of claim 25, wherein said calculating step (e) comprises:
f) dividing said axial distance between said measurement locations by said time delay signal ~.
27. The method of claim 23 wherein:
said measuring step (a) comprises:
measuring a first unsteady pressure and a second unsteady pressure;
subtracting said second unsteady pressure from said first unsteady pressure to form said first vortical pressure signal; and said measuring step (b) comprises:
measuring a third unsteady pressure and a fourth unsteady pressure; and subtracting said fourth unsteady pressure from said third unsteady pressure to form said second vortical pressure signal.
28. The method of claim 23 wherein:
said first vortical pressure signal is indicative of wavelengths associated with a vortical pressure field and not associated with an acoustic pressure field at said first location; and said second vortical pressure signal is indicative of wavelengths associated with said vortical pressure field and not associated with an acoustic pressure field at said second location.
29. The method of claim 23 wherein said vortical pressure field comprises an
30. The method of claim 23 wherein said measuring steps (a) and (b) comprise measuring a strain of the pipe (12).
31. The method of claim 27 wherein said step of measuring said first and said second unsteady pressures comprises measuring a strain of the pipe (12).
32.The method of claim 27 wherein said step of measuring said third and said fourth unsteady pressures comprises measuring a strain of the pipe (12).
33.The method of claim 23 further comprising calculating the volumetric flow rate of said fluid.
CA2381891A 1999-07-02 2000-06-27 Flow rate measurement using unsteady pressures Expired - Fee Related CA2381891C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US34660799A 1999-07-02 1999-07-02
US09/346,607 1999-07-02
PCT/US2000/017640 WO2001002810A1 (en) 1999-07-02 2000-06-27 Flow rate measurement using unsteady pressures

Publications (2)

Publication Number Publication Date
CA2381891A1 true CA2381891A1 (en) 2001-01-11
CA2381891C CA2381891C (en) 2010-08-10

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CA2381891A Expired - Fee Related CA2381891C (en) 1999-07-02 2000-06-27 Flow rate measurement using unsteady pressures

Country Status (6)

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US (1) US6889562B2 (en)
EP (1) EP1194745B1 (en)
AU (1) AU776582B2 (en)
CA (1) CA2381891C (en)
DE (1) DE60036472D1 (en)
WO (1) WO2001002810A1 (en)

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CN110622023B (en) * 2017-05-17 2023-11-24 国际商业机器公司 Combined chemical and velocity sensor for fluid pollution analysis

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AU776582B2 (en) 2004-09-16
WO2001002810A1 (en) 2001-01-11
EP1194745B1 (en) 2007-09-19
EP1194745A1 (en) 2002-04-10
US20020129662A1 (en) 2002-09-19
US6889562B2 (en) 2005-05-10
DE60036472D1 (en) 2007-10-31
CA2381891C (en) 2010-08-10
AU5770700A (en) 2001-01-22

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