CA2321301A1 - Narrow band infrared water cut meter - Google Patents

Narrow band infrared water cut meter Download PDF

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Publication number
CA2321301A1
CA2321301A1 CA002321301A CA2321301A CA2321301A1 CA 2321301 A1 CA2321301 A1 CA 2321301A1 CA 002321301 A CA002321301 A CA 002321301A CA 2321301 A CA2321301 A CA 2321301A CA 2321301 A1 CA2321301 A1 CA 2321301A1
Authority
CA
Canada
Prior art keywords
flow stream
narrow band
phase
water cut
infrared
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
CA002321301A
Other languages
French (fr)
Other versions
CA2321301C (en
Inventor
Roberto M. Lansangan
John S. Lievois
Mark E. Sudberry
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 Artificial Lift Systems Inc
Original Assignee
Premier Instruments, Inc.
Roberto M. Lansangan
John S. Lievois
Mark E. Sudberry
Weatherford Artificial Lift Systems, 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 Premier Instruments, Inc., Roberto M. Lansangan, John S. Lievois, Mark E. Sudberry, Weatherford Artificial Lift Systems, Inc. filed Critical Premier Instruments, Inc.
Publication of CA2321301A1 publication Critical patent/CA2321301A1/en
Application granted granted Critical
Publication of CA2321301C publication Critical patent/CA2321301C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26Oils; viscous liquids; paints; inks
    • G01N33/28Oils, i.e. hydrocarbon liquids
    • G01N33/2823Oils, i.e. hydrocarbon liquids raw oil, drilling fluid or polyphasic mixtures
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3577Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26Oils; viscous liquids; paints; inks
    • G01N33/28Oils, i.e. hydrocarbon liquids
    • G01N33/2835Oils, i.e. hydrocarbon liquids specific substances contained in the oil or fuel
    • G01N33/2847Water in oil

Abstract

The present invention provides a narrow band infrared water cut meter for detecting a full water cut range of a flow stream. The water cut meter includes a light source probe for irradiating the flow stream with a narrow band of infrared light and a light detector probe for sensing infrared light passed through the flow stream. For a narrow band of infrared light of a predetermined wavelength, there is a large difference in the absorption of infrared radiation between oil and water.
At such a wavelength, the narrow band of infrared light is substantially transmitted through water content and gas content of the flow stream and substantially absorbed by oil content of the flow stream. The water cut meter thus differentiates oil by treating gas like water. Unlike other water cut meters, the narrow band infrared water cut meter is independent of variations of oil and water densities, salinity, oil emulsions, varying flow rates, and the gas content of a flow stream.

Claims (25)

1. A narrow band infrared water cut meter, comprising:
a light source probe for emitting a narrow band of infrared light of a predetermined wavelength to a three-phase flow stream; and a light detector probe for detecting attenuation of the narrow band of infrared light by the three-phase flow stream, wherein the narrow band of infrared light of the predetermined wavelength is substantially transmitted through a first phase and a second phase of the three-phase flow stream and substantially absorbed by a third phase of the three-phase flow stream, and wherein a water cut of the flow stream is determined by the attenuation of the narrow band of infrared light by the three-phase flow stream.
2. The water cut meter of claim 1, wherein the three phase flow stream includes an oil content, a gas content, and a water content, and wherein the narrow band of infrared light of the predetermined wavelength is substantially transmitted through the water content and the gas content and substantially absorbed by the oil content.
3. The water cut meter of claim 1, wherein the predetermined wavelength is in the range of 800 to 1200 nm.
4. The water cut meter of claim 3, wherein the predetermined wavelength is approximately 950 nm.
5. The water cut meter of claim 1, the light source probe further comprising:
an emitter for emitting the narrow band of infrared light to the flow stream;
and an offline backside detector for detecting reflectance of the narrow band of infrared light by the flow stream.
6. The water cut meter of claim 1, the light detector probe comprising:
an online forward detector for detecting absorption of the narrow band of infrared light by the flow stream.
7. The water cut meter of claim 6, the light detector probe further comprising:
an offline forward detector for detecting reflectance of the narrow band of infrared light by the flow stream.
8. The water cut meter of claim 1, wherein the narrow band of infrared light is substantially absorbed by the oil content and the water content and substantially transmitted by the gas content.
9. A narrow band infrared water cut system, comprising:
a narrow band infrared water cut meter, comprising:
a light source probe for emitting a narrow band of infrared light of a predetermined wavelength to a three-phase flow stream; and a light detector probe for detecting attenuation of the narrow band of infrared light by the three-phase flow stream, wherein the narrow band of infrared light of the predetermined wavelength is substantially transmitted through a first phase and a second phase of the three-phase flow stream and substantially absorbed by a third phase of the three-phase flow stream, and wherein a water cut of the three-phase flow stream is determined by the attenuation of the narrow band of infrared light by the three-phase flow stream;
a signal conditioning block for generating a temperature sensing signal and an absorption signal representing absorption of the narrow band of infrared light by the flow stream; and a flow computer for processing the temperature sensing signal and the absorption signal to determine a water cut of the flow stream.
10. The water cut system of claim 9, the light source probe detecting reflectance of the narrow band of infrared light by the flow stream, wherein the signal conditioning block generates a reflectance signal representing reflectance of the narrow band of infrared light by the flow stream and wherein the flow computer processes the reflectance signal as a step in determining the water cut of the flow stream.
11. The water cut system of claim 9, the light detector probe detecting scattering of the narrow band of infrared light by the flow stream, wherein the signal conditioning block generates a scattering signal representing scattering of the narrow band of infrared light by the flow stream and wherein the flow computer processes the scattering signal as a step in determining the water cut of the flow stream.
12. A narrow band infrared well line testing system comprising:
a well line providing a flow stream having a water content, oil content, and gas content;

a first narrow band infrared water cut meter for emitting to the flow stream a narrow band of infrared light of a first predetermined wavelength substantially transmitted through the water content and the gas content and substantially absorbed by the oil content; and a second narrow band infrared water cut meter for receiving the flow stream from the first narrow band water cut meter and emitting to the flow stream a narrow band of infrared light of a second predetermined wavelength substantially absorbed by the oil content and the water content and substantially transmitted by the gas content.
13. The well testing system of claim 12, wherein the first predetermined wavelength is approximately 950 nm.
14. The well testing system of claim 12, wherein the second predetermined wavelength is approximately 1140 nm.
15. The well testing system of claim 12, wherein the first predetermined wavelength and the second predetermined wavelength are in the range of 800 to 1200 nm.
16. The well testing system of claim 12, wherein the first narrow band infrared water cut meter indicates a fraction of the oil content and the second narrow band infrared water cut meter indicates a fraction of the gas content and a fraction of the water content.
17. A method of measuring concentration of a tri-phase flow stream at a well line using a first narrow band infrared water cut meter and a second narrow band infrared water cut meter, comprising the steps of:
flowing a tri-phase flow stream to the first narrow band infrared water cut meter;
emitting a narrow band infrared light of a first predetermined wavelength substantially transmitted through a first phase and a second phase and substantially absorbed by a third phase to the tri-phase flow stream by the first narrow band infrared water cut meter;
detecting attenuation of the narrow band of infrared light of the first predetermined wavelength by the first narrow band infrared water cut meter;
flowing the tri-phase flow stream from the first narrow band infrared water cut meter to the second narrow band infrared water cut meter;
emitting a narrow band of light of a second predetermined wavelength substantially absorbed by the first phase and the third phase and substantially transmitted by the second phase to the tri-phase flow stream by the second narrow band infrared water cut meter; and detecting attenuation of the narrow band of infrared light of the second predetermined wave-length by the second narrow band water cut meter.
18. The method of claim 17, further comprising the step of:
measuring the mass flow rate of the three-phase flow stream.
19. The method of claim 17, wherein the tri-phase flow stream comprises a gas phase, a water phase and an oil phase.
20. A method of measuring concentration of a tri-phase flow stream at a well testing satellite with a narrow band infrared water cut meter, comprising the steps of:
separating the tri-phase flow stream into a single-phase flow stream and a substantially two-phase flow stream;
flowing the two-phase flow stream through the narrow band infrared water cut meter;
emitting a narrow band of infrared light of a predetermined wavelength substantially transmitted through a first phase and a second phase of the substantially two-phase flow stream and substantially absorbed by a third phase of the substantially two-phase flow stream by the narrow band infrared water cut meter to the two-phase flow stream; and detecting attenuation of the narrow band of infrared light by the two-phase flow stream by the narrow band infrared water cut meter.
21. The method of claim 20, further comprising the step of:
measuring a flow rate of the two-phase flow stream.
22. The method of claim 20, further comprising the step of:
measuring a flow rate of the single-phase flow stream.
23. The method of claim 20, wherein the single-phase flow stream comprises gas content and the two-phase flow stream comprises oil content and water content.
24. A method of measuring concentration of a tri-phase flow stream at a well line using a narrow band infrared water cut meter, comprising the steps of:
diverting a tri-phase flow stream from a well line to a two-phase separator;
separating the tri-phase flow stream into a single-phase flow stream and a substantially two-phase flow stream;
flowing the substantially two-phase flow stream through the narrow band infrared water cut meter; and
25 emitting a narrow band of infrared light of a predetermined wavelength substantially transmitted through a first phase and a second phase of the substantially two-phase flow stream and substantially absorbed by a third phase of the substantially two-phase flow stream by the narrow band infrared water cut meter to the two-phase flow stream; and detecting attenuation of the narrow band of infrared light by the substantially two-phase flow stream by the narrow band infrared water cut meter.
25. The method of claim 24, wherein the single-phase flow stream comprises gas content and the two-phase flow stream comprises oil content and water content.
CA2321301A 1998-02-26 1999-02-25 Narrow band infrared water cut meter Expired - Lifetime CA2321301C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/031,098 1998-02-26
US09/031,098 US6076049A (en) 1998-02-26 1998-02-26 Narrow band infrared water cut meter
PCT/US1999/004140 WO1999044043A1 (en) 1998-02-26 1999-02-25 Narrow band infrared water cut meter

Publications (2)

Publication Number Publication Date
CA2321301A1 true CA2321301A1 (en) 1999-09-02
CA2321301C CA2321301C (en) 2012-04-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2321301A Expired - Lifetime CA2321301C (en) 1998-02-26 1999-02-25 Narrow band infrared water cut meter

Country Status (8)

Country Link
US (1) US6076049A (en)
EP (1) EP1058835B1 (en)
AT (1) ATE293249T1 (en)
AU (1) AU750219B2 (en)
CA (1) CA2321301C (en)
DE (1) DE69924709D1 (en)
NO (1) NO329985B1 (en)
WO (1) WO1999044043A1 (en)

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Also Published As

Publication number Publication date
ATE293249T1 (en) 2005-04-15
EP1058835A1 (en) 2000-12-13
EP1058835B1 (en) 2005-04-13
DE69924709D1 (en) 2005-05-19
NO20004262L (en) 2000-10-25
AU3311899A (en) 1999-09-15
WO1999044043A1 (en) 1999-09-02
US6076049A (en) 2000-06-13
NO329985B1 (en) 2011-01-31
EP1058835A4 (en) 2001-07-18
AU750219B2 (en) 2002-07-11
NO20004262D0 (en) 2000-08-25
CA2321301C (en) 2012-04-17

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