CA2461973A1 - Sand monitoring within wells using acoustic arrays - Google Patents

Sand monitoring within wells using acoustic arrays Download PDF

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Publication number
CA2461973A1
CA2461973A1 CA002461973A CA2461973A CA2461973A1 CA 2461973 A1 CA2461973 A1 CA 2461973A1 CA 002461973 A CA002461973 A CA 002461973A CA 2461973 A CA2461973 A CA 2461973A CA 2461973 A1 CA2461973 A1 CA 2461973A1
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CA
Canada
Prior art keywords
fluid
sensors
conduit
acoustic disturbances
power
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
CA002461973A
Other languages
French (fr)
Other versions
CA2461973C (en
Inventor
Daniel L. Gysling
Douglas H. Loose
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 Lamb Inc
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Weatherford Lamb Inc
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 filed Critical Weatherford Lamb Inc
Publication of CA2461973A1 publication Critical patent/CA2461973A1/en
Application granted granted Critical
Publication of CA2461973C publication Critical patent/CA2461973C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/704Measuring 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
    • G01F1/708Measuring the time taken to traverse a fixed distance
    • G01F1/7082Measuring the time taken to traverse a fixed distance using acoustic detecting arrangements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/704Measuring 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
    • G01F1/708Measuring the time taken to traverse a fixed distance
    • G01F1/712Measuring the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06Investigating concentration of particle suspensions
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating 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
    • G01N29/04Analysing solids
    • G01N29/045Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
    • G01N29/046Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks using the echo of particles imparting on a surface; using acoustic emission of particles
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/02Indexing codes associated with the analysed material
    • G01N2291/024Mixtures
    • G01N2291/02416Solids in liquids
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/02Indexing codes associated with the analysed material
    • G01N2291/028Material parameters
    • G01N2291/02836Flow rate, liquid level
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/02Indexing codes associated with the analysed material
    • G01N2291/028Material parameters
    • G01N2291/02872Pressure

Abstract

A method for detecting the presence of particles, such as sand, flowing within a fluid in a conduit is disclosed. At least two optical sensors measure pressure variations propagating through the fluid. These pressure variations are caused by acoustic noise generated by typical background noises of the well production environment and from sand particles flowing within the fluid. If the acoustics are sufficiently energetic with respect to other disturbances, the signals provided by the sensors will form an acoustic ridge on a k.omega. plot, where each data point represents the power of the acoustic wave corresponding to that particular wave number and temporal frequency. A sand metric then compares the average power of the data points forming the acoustic ridge to the average power of the data points falling outside of the acoustic ridge. The result of this comparison allows one to determine whether particles are present within the fluid.
Furthermore, the present invention can also determine whether the generated acoustic noise is occurring upstream or downstream of the sensors, thus giving an indication of the location of the particles in the fluid relative to the sensors.

Claims (44)

1. A method for detecting particles in a fluid within a conduit, comprising:
placing at least two sensors along the conduit;
measuring acoustic disturbances within the fluid using the sensors to produce at least two pressure signals;
converting the pressure signals to form a data set indicative of the power of the pressure disturbances;
computing a metric indicative of the presence of particles in the fluid using the data set, wherein the metric comprises a quantification of power within a frequency range attributable to the presence of the particles;
and determining the presence of particles in the fluid based on the metric.
2. The method of claim 1, wherein the pressure signals are indicative of distance and time.
3. The method of claim 1, wherein the data set is indicative of the frequency and wavelength of the acoustic disturbances.
4. The method of claim 1, further comprising quantifying the particles in the fluid.
5. The method of claim 1, wherein the the frequency range is approximately 200 to 800 Hz.
6. The method of claim 1, wherein the metric comprises an assessment of the power traveling at the speed of sound in the fluid.
7. The method of claim 1, wherein the metric further comprises an assessment of the power traveling at the speed of sound in the fluid and the power not traveling at the speed of sound in the fluid.
8. The method of claim 1, wherein the data set comprises a k.omega. plot.
9. The method of claim 8, wherein computing the metric comprises identifying a ridge in the k.omega. plot, wherein the ridge corresponds to the acoustic disturbances that are traveling at the speed of sound in the fluid.
10. The method of claim 9, wherein computing the metric comprises computing an averaged or summed power along the ridge.
11. The method of claim 10, wherein computing the metric further comprises computing an averaged or summed power in a region outside of the ridge.
12. The method of claim 11, wherein the region outside of the ridge corresponds to a range of speeds of sound in the fluid.
13. The method of claim 11, wherein the metric comprises a calculation containing as variables (i) the averaged or summed power along the ridge, and (ii) the averaged or summed power in the region outside of the ridge.
14. The method of claim 1, wherein the sensors are coupled to an exterior surface of the conduit.
15. The method of claim 1, wherein the sensors are wrapped around the conduit.
16 16. The method of claim 15, wherein the sensors comprise fiber optic cable.
17. The method of claim 16, wherein the sensors each comprise at least one wrap of fiber optic cable.
18. The method of claim 17, wherein the sensors are serially coupled to fiber Bragg gratings.
19. A method for detecting particles in a fluid within a conduit using a flow meter coupled to the conduit, comprising in order:
(a) ceasing the flow of fluid through the conduit;
(b) directionally detecting acoustic disturbances within the fluid above the meter at a first time; and (c) directionally detecting acoustic disturbances within the fluid below the meter at a second time.
20. The method of claim 19, wherein directionally detecting the acoustic disturbances comprises the use of a k.omega. data set.
21. The method of claim 20, wherein step (b) comprises assessing the data set for a single ridge and wherein step (c) comprises assessing the data set for a single second ridge different from the first ridge.
22. The method of claim 21, wherein the acoustic disturbances lie along the first or second ridge.
23. The method of claim 19, wherein the acoustic disturbances travel at the speed of sound in the fluid.
24. The method of claim 19, wherein the flow meter comprises at least two sensors.
25. The method of claim 24, wherein the sensors are coupled to the outside of the conduit.
26. The method of claim 25, wherein the sensors comprise fiber optic sensors.
27. A method for detecting particle in a fluid within a conduit using a flow meter coupled to the conduit, comprising in order:
(a) ceasing the flow of fluid through the conduit;
(b) directionally detecting acoustic disturbances within the fluid above the meter at a first time and assessing a first power of the acoustic disturbances; and (c) directionally detecting acoustic disturbances within the fluid above the meter at a second time and assessing a second power of the acoustic disturbances, wherein the second power is greater than the first power.
28. The method of claim 27, wherein directionally detecting the acoustic disturbances comprises the use of a k.omega. data set.
29. The method of claim 28, wherein the first and second powers in steps (b) and (c) are assessed along a ridge of the data set.
30. The method of claim 29, wherein the acoustic disturbances lie along the ridge.
31. The method of claim 27, wherein the acoustic disturbances travel at the speed of sound in the fluid.
32. The method of claim 27, wherein the flow meter comprises at least two sensors.
33. The method of claim 32, wherein the sensors are coupled to the outside of the conduit.
34. The method of claim 33, wherein the sensors comprise fiber optic sensors.
35. A method for detecting particle in a fluid within a conduit using a flow meter coupled to the conduit, comprising in order:
(a) ceasing the flow of fluid through the conduit;
(b) directionally detecting acoustic disturbances within the fluid below the meter at a first time and assessing a first power of the acoustic disturbances; and (c) directionally detecting acoustic disturbances within the fluid below the meter at a second time and assessing a second power of the acoustic disturbances, wherein the second power is less than the first power.
36. The method of claim 35, wherein directionally detecting the acoustic disturbances comprises the use of a k.omega. data set.
37. The method of claim 36, wherein the first and second powers in steps (b) and (c) are assessed along a ridge of the data set.
38. The method of claim 37, wherein the acoustic disturbances lie along the ridge.
39. The method of claim 35, wherein the acoustic disturbances travel at the speed of sound in the fluid.
40: The method of claim 35, wherein the flow meter comprises at least two sensors.
41. The method of claim 40, wherein the sensors are coupled to the outside of the conduit.
42. The method of claim 41, wherein the sensors comprise fiber optic sensors.
43. The method of claim 19, further comprising determining a presence of the particles based on signals provided from detecting the acoustic disturbances within the fluid above the meter and the acoustic disturbances within the fluid below the meter.
44. A system for detecting particles in a fluid within a conduit, comprising:
at least two sensors along the conduit, the sensors for detecting acoustic disturbances within the fluid;
a processor for converting pressure signals from the at least two sensor into a data set;
an analyzer for assessing the data set and computing a metric based on a quantification of power within a frequency range attributable to the presence of the particles; and an output based on the metric, wherein the output indicates the presence of particles in the fluid.
CA002461973A 2003-03-19 2004-03-19 Sand monitoring within wells using acoustic arrays Expired - Fee Related CA2461973C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/392,493 2003-03-19
US10/392,493 US6837098B2 (en) 2003-03-19 2003-03-19 Sand monitoring within wells using acoustic arrays

Publications (2)

Publication Number Publication Date
CA2461973A1 true CA2461973A1 (en) 2004-09-19
CA2461973C CA2461973C (en) 2009-12-01

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US (2) US6837098B2 (en)
CA (1) CA2461973C (en)
GB (1) GB2399637B (en)

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US7028538B2 (en) 2006-04-18
US6837098B2 (en) 2005-01-04
US20040182139A1 (en) 2004-09-23
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CA2461973C (en) 2009-12-01
GB0406245D0 (en) 2004-04-21

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