CA2428336A1 - Method and system for determining the speed of sound in a fluid within a conduit - Google Patents

Method and system for determining the speed of sound in a fluid within a conduit Download PDF

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Publication number
CA2428336A1
CA2428336A1 CA002428336A CA2428336A CA2428336A1 CA 2428336 A1 CA2428336 A1 CA 2428336A1 CA 002428336 A CA002428336 A CA 002428336A CA 2428336 A CA2428336 A CA 2428336A CA 2428336 A1 CA2428336 A1 CA 2428336A1
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CA
Canada
Prior art keywords
sound
speed
fluid
elongated body
spectral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002428336A
Other languages
French (fr)
Other versions
CA2428336C (en
Inventor
Daniel L. Gysling
James D. Paduano
Alan D. Kersey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weatherford Technology Holdings LLC
Original Assignee
Weatherford/Lamb, Inc.
Daniel L. Gysling
James D. Paduano
Alan D. Kersey
Weatherford Technology Holdings, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weatherford/Lamb, Inc., Daniel L. Gysling, James D. Paduano, Alan D. Kersey, Weatherford Technology Holdings, Llc filed Critical Weatherford/Lamb, Inc.
Publication of CA2428336A1 publication Critical patent/CA2428336A1/en
Application granted granted Critical
Publication of CA2428336C publication Critical patent/CA2428336C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4472—Mathematical theories or simulation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
    • G01V1/30—Analysis
    • G01V1/303—Analysis for determining velocity profiles or travel times
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02872—Pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/10—Number of transducers
    • G01N2291/106—Number of transducers one or more transducer arrays

Abstract

For measuring the speed of sound in a fluid contained within an elongated body, the sound traversing the elongated body substantially along a direction aligned with the longest axis of the elongated body, the sound causing a momentary change in pressure in a portion of the fluid as the sound traverses the portion of the fluid, a method includes the steps of: providing at predetermined locations an array of at least two sensors distributed along the elongated body, each sensor for discerning and signaling spatio-temporally sampled data including information indicating the pressure of the fluid at the position of the sensor; acquiring the spatio-temporally sampled data from each sensor at each of a number of instants of time; constructing a plot derivable from a plot, using a technique selected from the group consisting of spectral-based algorithms, such as the Capon method or the MUSIC method, in which a spectrum-like function of the speed of sound is formed, and parametric methods of solution, such as the deterministic maximum likelihood method; identifying in the plot a spectral ridge, and determining the slope of the spectral ridge;
and determining the speed of sound assuming a relation between the speed of sound and the slope of the spectral ridge.
CA002428336A 2000-12-04 2001-12-04 Method and system for determining the speed of sound in a fluid within a conduit Expired - Fee Related CA2428336C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US25099700P 2000-12-04 2000-12-04
US60/250,997 2000-12-04
PCT/GB2001/005352 WO2002046737A2 (en) 2000-12-04 2001-12-04 Method and system for determining the speed of sound in a fluid within a conduit

Publications (2)

Publication Number Publication Date
CA2428336A1 true CA2428336A1 (en) 2002-06-13
CA2428336C CA2428336C (en) 2007-03-06

Family

ID=22950050

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002428336A Expired - Fee Related CA2428336C (en) 2000-12-04 2001-12-04 Method and system for determining the speed of sound in a fluid within a conduit

Country Status (7)

Country Link
US (1) US6587798B2 (en)
EP (1) EP1356272B1 (en)
AU (1) AU2002220879A1 (en)
CA (1) CA2428336C (en)
DE (1) DE60103781T2 (en)
NO (1) NO329870B1 (en)
WO (1) WO2002046737A2 (en)

Families Citing this family (96)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7275421B2 (en) * 2002-01-23 2007-10-02 Cidra Corporation Apparatus and method for measuring parameters of a mixture having solid particles suspended in a fluid flowing in a pipe
US7359803B2 (en) * 2002-01-23 2008-04-15 Cidra Corporation Apparatus and method for measuring parameters of a mixture having solid particles suspended in a fluid flowing in a pipe
US7032432B2 (en) * 2002-01-23 2006-04-25 Cidra Corporation Apparatus and method for measuring parameters of a mixture having liquid droplets suspended in a vapor flowing in a pipe
US7328624B2 (en) * 2002-01-23 2008-02-12 Cidra Corporation Probe for measuring parameters of a flowing fluid and/or multiphase mixture
EP1495291B1 (en) * 2002-04-10 2019-09-04 CiDra Corporation Probe and method for measuring parameters of a flowing fluid and/or multiphase mixture
AU2003255235A1 (en) * 2002-08-08 2004-02-25 Cidra Corporation Apparatus and method for measuring multi-phase flows in pulp and paper industry applications
CA2513105C (en) * 2002-11-12 2013-01-08 Cidra Corporation An apparatus having an array of piezoelectric film sensors for measuring parameters of a process flow within a pipe
US7165464B2 (en) * 2002-11-15 2007-01-23 Cidra Corporation Apparatus and method for providing a flow measurement compensated for entrained gas
AU2003295992A1 (en) * 2002-11-22 2004-06-18 Cidra Corporation Method for calibrating a flow meter having an array of sensors
WO2004063741A2 (en) * 2003-01-13 2004-07-29 Cidra Corporation Apparatus for measuring parameters of a flowing multiphase fluid mixture
ATE480753T1 (en) * 2003-01-13 2010-09-15 Expro Meters Inc APPARATUS AND METHOD FOR DETERMINING THE VELOCITY OF A FLUID IN A PIPE USING ULTRASONIC SENSORS
WO2004065912A2 (en) * 2003-01-21 2004-08-05 Cidra Corporation Apparatus and method for measuring unsteady pressures within a large diameter pipe
US20060048583A1 (en) * 2004-08-16 2006-03-09 Gysling Daniel L Total gas meter using speed of sound and velocity measurements
US7086278B2 (en) * 2003-01-21 2006-08-08 Cidra Corporation Measurement of entrained and dissolved gases in process flow lines
US7343818B2 (en) * 2003-01-21 2008-03-18 Cidra Corporation Apparatus and method of measuring gas volume fraction of a fluid flowing within a pipe
EP1590637B1 (en) * 2003-01-21 2008-11-05 Expro Meters, Inc. An apparatus and method of measuring gas volume fraction of a fluid flowing within a pipe
EP1599705B1 (en) * 2003-03-04 2019-01-02 CiDra Corporation An apparatus having a multi-band sensor assembly for measuring a parameter of a fluid flow flowing within a pipe
EP1631797A2 (en) * 2003-06-05 2006-03-08 CiDra Corporation Apparatus for measuring velocity and flow rate of a fluid having a non-negligible axial mach number using an array of sensors
US7121152B2 (en) * 2003-06-06 2006-10-17 Cidra Corporation Portable flow measurement apparatus having an array of sensors
EP1644705B1 (en) * 2003-06-24 2016-10-12 Cidra Corporate Services, Inc. System and method for operating a flow process
US7197938B2 (en) * 2003-06-24 2007-04-03 Cidra Corporation Contact-based transducers for characterizing unsteady pressures in pipes
WO2005003695A1 (en) * 2003-06-24 2005-01-13 Cidra Corporation Characterizing unsteady pressures in pipes using optical measurement devices
WO2005003713A2 (en) * 2003-06-24 2005-01-13 Cidra Corporation Contact-based transducers for characterizing unsteady pressures in pipes
WO2005054789A1 (en) * 2003-07-08 2005-06-16 Cidra Corporation Method and apparatus for measuring characteristics of core-annular flow
US7299705B2 (en) * 2003-07-15 2007-11-27 Cidra Corporation Apparatus and method for augmenting a Coriolis meter
US7127360B2 (en) * 2003-07-15 2006-10-24 Cidra Corporation Dual function flow measurement apparatus having an array of sensors
CA2532577C (en) * 2003-07-15 2013-01-08 Cidra Corporation A configurable multi-function flow measurement apparatus having an array of sensors
US7134320B2 (en) * 2003-07-15 2006-11-14 Cidra Corporation Apparatus and method for providing a density measurement augmented for entrained gas
ATE414261T1 (en) * 2003-07-15 2008-11-15 Expro Meters Inc APPARATUS AND METHOD FOR COMPENSATING A CORIOLIS FLOW METER
WO2005012843A2 (en) 2003-08-01 2005-02-10 Cidra Corporation Method and apparatus for measuring parameters of a fluid flowing within a pipe using a configurable array of sensors
US7322251B2 (en) * 2003-08-01 2008-01-29 Cidra Corporation Method and apparatus for measuring a parameter of a high temperature fluid flowing within a pipe using an array of piezoelectric based flow sensors
US7882750B2 (en) * 2003-08-01 2011-02-08 Cidra Corporate Services, Inc. Method and apparatus for measuring parameters of a fluid flowing within a pipe using a configurable array of sensors
US7308820B2 (en) * 2003-08-08 2007-12-18 Cidra Corporation Piezocable based sensor for measuring unsteady pressures inside a pipe
US7110893B2 (en) * 2003-10-09 2006-09-19 Cidra Corporation Method and apparatus for measuring a parameter of a fluid flowing within a pipe using an array of sensors
US7237440B2 (en) * 2003-10-10 2007-07-03 Cidra Corporation Flow measurement apparatus having strain-based sensors and ultrasonic sensors
US7171315B2 (en) * 2003-11-25 2007-01-30 Cidra Corporation Method and apparatus for measuring a parameter of a fluid flowing within a pipe using sub-array processing
US7152003B2 (en) * 2003-12-11 2006-12-19 Cidra Corporation Method and apparatus for determining a quality metric of a measurement of a fluid parameter
BRPI0508637B1 (en) * 2004-03-10 2017-10-10 Cidra Corporation METHOD AND APPARATUS FOR MEASURING PARAMETERS OF A STRATIFIED FLOW
US7330797B2 (en) * 2004-03-10 2008-02-12 Cidra Corporation Apparatus and method for measuring settlement of solids in a multiphase flow
US7367239B2 (en) * 2004-03-23 2008-05-06 Cidra Corporation Piezocable based sensor for measuring unsteady pressures inside a pipe
US7426852B1 (en) 2004-04-26 2008-09-23 Expro Meters, Inc. Submersible meter for measuring a parameter of gas hold-up of a fluid
WO2005116637A2 (en) * 2004-05-17 2005-12-08 Cidra Corporation Apparatus and method for measuring the composition of a mixture
US7707143B2 (en) * 2004-06-14 2010-04-27 International Business Machines Corporation Systems, methods, and computer program products that automatically discover metadata objects and generate multidimensional models
WO2006112878A2 (en) 2004-09-16 2006-10-26 Cidra Corporation Apparatus and method for providing a fluid cut measurement of a multi-liquid mixture compensated for entrained gas
US7389687B2 (en) * 2004-11-05 2008-06-24 Cidra Corporation System for measuring a parameter of an aerated multi-phase mixture flowing in a pipe
US7561203B2 (en) * 2005-01-10 2009-07-14 Nokia Corporation User input device
WO2006099342A1 (en) * 2005-03-10 2006-09-21 Cidra Corporation An industrial flow meter having an accessible digital interface
US7962293B2 (en) 2005-03-10 2011-06-14 Expro Meters, Inc. Apparatus and method for providing a stratification metric of a multiphase fluid flowing within a pipe
WO2010120258A2 (en) 2005-03-17 2010-10-21 Cidra Corporation An apparatus and method of processing data to improve the performance of a flow monitoring system
US7657392B2 (en) * 2005-05-16 2010-02-02 Cidra Corporate Services, Inc. Method and apparatus for detecting and characterizing particles in a multiphase fluid
WO2006130499A2 (en) * 2005-05-27 2006-12-07 Cidra Corporation An apparatus and method for fiscal measuring of an aerated fluid
US7526966B2 (en) * 2005-05-27 2009-05-05 Expro Meters, Inc. Apparatus and method for measuring a parameter of a multiphase flow
US7249525B1 (en) 2005-06-22 2007-07-31 Cidra Corporation Apparatus for measuring parameters of a fluid in a lined pipe
US7603916B2 (en) 2005-07-07 2009-10-20 Expro Meters, Inc. Wet gas metering using a differential pressure and a sonar based flow meter
US8641813B2 (en) 2005-07-07 2014-02-04 Expro Meters, Inc. System and method for optimizing a gas/liquid separation process
US7503227B2 (en) * 2005-07-13 2009-03-17 Cidra Corporate Services, Inc Method and apparatus for measuring parameters of a fluid flow using an array of sensors
US9109433B2 (en) 2005-08-01 2015-08-18 Baker Hughes Incorporated Early kick detection in an oil and gas well
US7523640B2 (en) * 2005-08-01 2009-04-28 Baker Hughes Incorporated Acoustic fluid analyzer
US7614302B2 (en) * 2005-08-01 2009-11-10 Baker Hughes Incorporated Acoustic fluid analysis method
US8794062B2 (en) * 2005-08-01 2014-08-05 Baker Hughes Incorporated Early kick detection in an oil and gas well
US7454981B2 (en) * 2006-05-16 2008-11-25 Expro Meters. Inc. Apparatus and method for determining a parameter in a wet gas flow
WO2008013957A1 (en) * 2006-07-27 2008-01-31 Cidra Corporation Apparatus and method for attenuating acoustic waves in propagating within a pipe wall
US7624650B2 (en) * 2006-07-27 2009-12-01 Expro Meters, Inc. Apparatus and method for attenuating acoustic waves propagating within a pipe wall
US7624651B2 (en) * 2006-10-30 2009-12-01 Expro Meters, Inc. Apparatus and method for attenuating acoustic waves in pipe walls for clamp-on ultrasonic flow meter
US7673526B2 (en) * 2006-11-01 2010-03-09 Expro Meters, Inc. Apparatus and method of lensing an ultrasonic beam for an ultrasonic flow meter
EP2092278A2 (en) 2006-11-09 2009-08-26 Expro Meters, Inc. Apparatus and method for measuring a fluid flow parameter within an internal passage of an elongated body
US7881884B2 (en) * 2007-02-06 2011-02-01 Weatherford/Lamb, Inc. Flowmeter array processing algorithm with wide dynamic range
US8346491B2 (en) 2007-02-23 2013-01-01 Expro Meters, Inc. Sonar-based flow meter operable to provide product identification
US8061186B2 (en) 2008-03-26 2011-11-22 Expro Meters, Inc. System and method for providing a compositional measurement of a mixture having entrained gas
AU2015200314B2 (en) * 2009-05-27 2017-02-02 Silixa Limited Method and apparatus for optical sensing
CN114563027A (en) 2009-05-27 2022-05-31 希里克萨有限公司 Optical sensing method and device
KR20130003003A (en) 2010-03-09 2013-01-08 사이드라 코포레이트 서비시즈 아이엔씨. Method and apparatus for determining gvf(gas volume fraction) for aerated fluids and liquids in flotation tanks, columns, drums, tubes, vats
DE102010019811A1 (en) * 2010-05-06 2011-11-10 Airbus Operations Gmbh Method and device for measuring the flow velocity by means of a plasma
IT1400033B1 (en) * 2010-05-07 2013-05-17 Mulargia SEISMIC ANTENNA WITH UNIFORM SPACE SAMPLE IN WAVE LENGTH.
US10228706B2 (en) 2011-10-05 2019-03-12 Cidra Corporate Services Inc. Method and apparatus for using velocity profile measurements in recovering bitumen from a coarse tailings line
US11269361B2 (en) * 2011-10-05 2022-03-08 Cidra Corporate Services Inc. Method and apparatus for using velocity profile measurements in recovering bitumen from a coarse tailings line
RU2477498C1 (en) * 2011-11-25 2013-03-10 Учреждение Российской академии наук Тихоокеанский океанологический институт им. В.И. Ильичева Дальневосточного отделения РАН (ТОИ ДВО РАН) Method of monitoring vertical distribution of sound speed in shallow water conditions
US9366133B2 (en) 2012-02-21 2016-06-14 Baker Hughes Incorporated Acoustic standoff and mud velocity using a stepped transmitter
US10386522B2 (en) * 2012-12-28 2019-08-20 Halliburton Energy Services, Inc. Method and apparatus for the downhole in-situ determination of the speed of sound in a formation fluid
US10316648B2 (en) * 2015-05-06 2019-06-11 Baker Hughes Incorporated Method of estimating multi-phase fluid properties in a wellbore utilizing acoustic resonance
CN105651372B (en) * 2015-12-31 2018-07-27 西北工业大学 A kind of sonic velocity measurement method using multi-carrier frequency signals
BR112018070577A2 (en) 2016-04-07 2019-02-12 Bp Exploration Operating Company Limited detection of downhole sand ingress locations
AU2017246521B2 (en) 2016-04-07 2023-02-02 Bp Exploration Operating Company Limited Detecting downhole sand ingress locations
CN107918149A (en) * 2016-10-09 2018-04-17 中国石油化工股份有限公司 Observation system degree of covering evaluation method and system
AU2018246320A1 (en) 2017-03-31 2019-10-17 Bp Exploration Operating Company Limited Well and overburden monitoring using distributed acoustic sensors
AU2018321150A1 (en) 2017-08-23 2020-03-12 Bp Exploration Operating Company Limited Detecting downhole sand ingress locations
EP3695099A2 (en) 2017-10-11 2020-08-19 BP Exploration Operating Company Limited Detecting events using acoustic frequency domain features
EP3936697A1 (en) 2018-11-29 2022-01-12 BP Exploration Operating Company Limited Event detection using das features with machine learning
GB201820331D0 (en) 2018-12-13 2019-01-30 Bp Exploration Operating Co Ltd Distributed acoustic sensing autocalibration
WO2021007532A1 (en) 2019-07-10 2021-01-14 Expro Meters, Inc. Apparatus and method for measuring fluid flow parameters
CA3154435C (en) 2019-10-17 2023-03-28 Lytt Limited Inflow detection using dts features
EP4045766A1 (en) 2019-10-17 2022-08-24 Lytt Limited Fluid inflow characterization using hybrid das/dts measurements
WO2021093974A1 (en) 2019-11-15 2021-05-20 Lytt Limited Systems and methods for draw down improvements across wellbores
CA3180595A1 (en) 2020-06-11 2021-12-16 Lytt Limited Systems and methods for subterranean fluid flow characterization
CA3182376A1 (en) 2020-06-18 2021-12-23 Cagri CERRAHOGLU Event model training using in situ data
CN112051610B (en) * 2020-10-21 2021-06-11 中国地质大学（北京） Vector field multi-mode surface wave frequency dispersion calculation method and system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952578A (en) 1974-10-07 1976-04-27 The United States Of America As Represented By The Secretary Of The Department Of Health, Education And Welfare Scanning ultrasonic spectrograph for fluid analysis
US4320659A (en) 1978-02-27 1982-03-23 Panametrics, Inc. Ultrasonic system for measuring fluid impedance or liquid level
US4896540A (en) * 1988-04-08 1990-01-30 Parthasarathy Shakkottai Aeroacoustic flowmeter
DE4306119A1 (en) 1993-03-01 1994-09-08 Pechhold Wolfgang Prof Dr Mechanical broadband spectrometer
FI94909C (en) * 1994-04-19 1995-11-10 Valtion Teknillinen Acoustic flow measurement method and applicable device
US5948959A (en) 1997-05-29 1999-09-07 The United States Of America As Represented By The Secretary Of The Navy Calibration of the normal pressure transfer function of a compliant fluid-filled cylinder
EP1090274B1 (en) * 1998-06-26 2017-03-15 Weatherford Technology Holdings, LLC Fluid parameter measurement in pipes using acoustic pressures
US6354147B1 (en) * 1998-06-26 2002-03-12 Cidra Corporation Fluid parameter measurement in pipes using acoustic pressures
US6378357B1 (en) * 2000-03-14 2002-04-30 Halliburton Energy Services, Inc. Method of fluid rheology characterization and apparatus therefor

Also Published As

Publication number Publication date
DE60103781T2 (en) 2005-07-14
AU2002220879A1 (en) 2002-06-18
WO2002046737A3 (en) 2003-04-24
US20020100327A1 (en) 2002-08-01
NO20032311D0 (en) 2003-05-22
EP1356272B1 (en) 2004-06-09
US6587798B2 (en) 2003-07-01
DE60103781D1 (en) 2004-07-15
NO329870B1 (en) 2011-01-17
EP1356272A2 (en) 2003-10-29
NO20032311L (en) 2003-07-18
WO2002046737A2 (en) 2002-06-13
CA2428336C (en) 2007-03-06

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