WO2013100770A2 - A borehole instrument system for ramam scattering - Google Patents

A borehole instrument system for ramam scattering Download PDF

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Publication number
WO2013100770A2
WO2013100770A2 PCT/NO2012/050256 NO2012050256W WO2013100770A2 WO 2013100770 A2 WO2013100770 A2 WO 2013100770A2 NO 2012050256 W NO2012050256 W NO 2012050256W WO 2013100770 A2 WO2013100770 A2 WO 2013100770A2
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WO
WIPO (PCT)
Prior art keywords
borehole
housing
raman
instrument system
laser
Prior art date
Application number
PCT/NO2012/050256
Other languages
French (fr)
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WO2013100770A3 (en
Inventor
Arild Saasen
Original Assignee
Det Norske Oljeselskap As
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Application filed by Det Norske Oljeselskap As filed Critical Det Norske Oljeselskap As
Publication of WO2013100770A2 publication Critical patent/WO2013100770A2/en
Publication of WO2013100770A3 publication Critical patent/WO2013100770A3/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/001—Self-propelling systems or apparatus, e.g. for moving tools within the horizontal portion of a borehole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
    • E21B47/135—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency using light waves, e.g. infrared or ultraviolet waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/02—Prospecting

Definitions

  • the present invention relates to a borehole instrument system with a Raman spectroscopy device comprising a low-energy laser source and a Raman detector for Raman scattered photons.
  • the Raman spectroscopy detector requires a monochromatic filter in order to remove Rayleigh scattering which is of higher intensity than the Raman scattering.
  • the Raman spectroscopy device may be used for identifying the Raman shift between the transmitted and received photons, which is assumed to be related to covalent bondings of illuminated minerals or fluids in the borehole, providing thus enabling identification of minerals in the borehole wall or in the drilling mud, or chemical components in the mud or petroleum fluids in the borehole wall.
  • Raman spectroscopy has been tried on minerals collected from the shaker screen or from the mud system topsides in general, and this may provide important information about distinguishing mineral compositions of cuttings and cavings so as to drill more properly.
  • this requires the cuttings or cavings rock fragments to be transported to the mud shaker topsides, which requires transport time from the borehole to the topsides.
  • WO2008/063945 describes a downhole apparatus for determining properties of a geological formation around the borehole, with a packer for sealing and isolating a region of the borehole wall and for sucking in a sample of the formation fluid through a flowline into the device. Inside the device is a measurement cell illuminated by a laser beam and a Raman scattering detector. Properties of the geological formations, i.e. through properties of the extracted fluid.
  • the WO-publication describes a tunable laser device used downhole, but which is not properly operating at the ambient temperatures of the borehole without a thermoelectric cooling device.
  • the WO-publication describes a cooling device to minimize thermal noise of a CCE detector, assumedly due to the high ambient temperature of the borehole.
  • Fig. 1 is a borehole instrument system comprising a housing (1) in a borehole (B) , said housing (1) provided with an optical window (6, 61) for guiding a low-energy laser beam (L) induced in a laser (5) towards a borehole wall (w) , and a lens (6, 62) for collecting Raman scattered light (R) induced by said laser beam (L) and transmitting said Raman scattered light (R) to a Raman detector (8) arranged for identifying at least one mineral of said borehole wall.
  • a Raman detector (8) arranged for identifying at least one mineral of said borehole wall.
  • the present invention comprises a downhole logging tool for a petroleum well, wherein the logging tool has a laser beam to shine out through a window to illuminate the borehole wall, and a Raman detector to detect the Raman scattered light from the borehole wall and to make a Raman spectrogram for detecting peaks that characterizes the covalent bondings in the electron cloud of the minerals of the borehole wall.
  • a Raman detector to detect the Raman scattered light from the borehole wall and to make a Raman spectrogram for detecting peaks that characterizes the covalent bondings in the electron cloud of the minerals of the borehole wall.
  • An advantage of arranging the laser at the surface is the reduced ambient temperature of the laser device, which allows it to operate without any cooling device.
  • a similar advantage arises when using a CCD detector at the topsides as part of the Raman detector: the thermal noise in the detected signal is reduced: the present invention does away with any and both of those cooling devices.
  • Fig. 1 illustrates a broadly defined unspecified arrangement of a laser beam ⁇ L) sent through a window from a housing (1) in a borehole and light (R) of Raman scattered photons received in the housing.
  • Fig. 2 illustrates the laser (5) and the Raman detector (8) in the instrument (1) in the borehole (B) .
  • Fig. 3 illustrates the laser ⁇ 5) topsides of the borehole and a first optical fibre (2) extending from the laser (5) to the borehole instrument ⁇ 1) .
  • Fig. 4 illustrates a carbon fibre rod (10) comprising the first optical fibre (2) coiled on a drum ⁇ 11) and with the Raman detector ⁇ 8) arranged in the downhole housing ⁇ 1), the Raman detector (8) transmitting measurements to the surface via an electrical or optical signal on a signal line (22).
  • Fig. 4 also shows an injector head ⁇ 14) for running the rod ⁇ 10) or a slickline metal mantled cable ⁇ 13) in or out of the well.
  • FIG. 5 illustrates the borehole instrument system of the invention wherein said Raman detector (8) is arranged in said housing ⁇ 1), said housing ⁇ 1) arranged as a so-called “badger” being self- propelled and comprising a drilling motor ⁇ 9) in front of said housing (1), a compactor ⁇ 91) for compacting drilled rock fragments behind said housing in said borehole, and an unwinding cable (20) stored in said housing ⁇ 1) and extending in said compacted drilled rock fragments to the borehole surface .
  • said Raman detector (8) is arranged in said housing ⁇ 1), said housing ⁇ 1) arranged as a so-called “badger” being self- propelled and comprising a drilling motor ⁇ 9) in front of said housing (1), a compactor ⁇ 91) for compacting drilled rock fragments behind said housing in said borehole, and an unwinding cable (20) stored in said housing ⁇ 1) and extending in said compacted drilled rock fragments to the borehole surface .
  • Fig. 6 illustrates a similar arrangement but wherein the "badger" receives laser light from a laser source ⁇ 5) arranged topsides, and with a Raman detector in the badger.
  • Fig. 7 illustrates an embodiment of the invention wherein a laser source is arranged topside, transmitting a laser beam via an optical fibre ⁇ 2, 21) to the housing ⁇ 1) downhole further illuminating the borehole wall via a window (6, 61, 62) and wherein the Raman scattering received in the window (6, 6a, 62) is transmitted back via a second optical fibre (2, 22) to the topsides to a Raman spectroscope .
  • Fig. 8 is an illustration of a "shoe" portion of the housing (1) arranged for scraping against the borehole wall.
  • Fig. 9 illustrates roughly the present invention combined with a drillstring.
  • the present invention is illustrated broadly in Fig. 1 and is a borehole instrument system comprising a housing ⁇ 1) in a borehole ⁇ B) , said housing ⁇ 1) provided with an optical window ⁇ 6, 61) for guiding a low-energy laser beam (L) induced in a laser (5) towards a borehole wall (w) , and a lens ⁇ 6, 62) for collecting Raman scattered light ⁇ R) induced by said laser beam ⁇ L) and transmitting said Raman scattered light (R) to a Raman detector ⁇ 8) .
  • the Raman detector (8) is connected to a processor arranged for identifying at least one mineral of said borehole wall based on the detected frequencies of the Raman scattered signal.
  • the window or lens ⁇ 6, 61, 62) may be made in sapphire.
  • Fig. 1 does not identify the position of the laser source nor the Raman detector, even though it is assumed that due to the low intensity of the Raman scattered photons, the Raman detector (8) could advantageously be near the source of the Raman scattered photons, i.e. in the housing (1) in the borehole in order to reduce the risk of attenuation of the light signal.
  • a laser source ⁇ 5, 51 is arranged in the housing (1) in said
  • the low-energy laser beam (L) is induced by a laser ⁇ 5, 52) topsides of said borehole, said laser beam ⁇ L) transmitted through a first optical fibre (2, 21) to the housing and through said window (6) .
  • the borehole instrument system is in an embodiment arranged with said optical fibre in a fibre reinfored semi-rigid rod (10) such as a carbon fibre or glass fibre rod, stored on a drum (11) and connected to said laser ⁇ 5, 52) topsides.
  • a fibre reinfored semi-rigid rod such as a carbon fibre or glass fibre rod
  • Fig. 5 illustrates the borehole instrument system of the invention wherein said Raman detector (8) is arranged in said housing (1), said housing ⁇ 1) arranged as a so-called “badger” being self- propelled and comprising a drilling motor (9) in front of said housing (1), a compactor (91) for compacting drilled rock fragments behind said housing in said borehole, and an unwinding cable (20) stored in said housing (1) and extending in said compacted drilled rock fragments to the borehole surface .
  • said Raman detector (8) is arranged in said housing (1), said housing ⁇ 1) arranged as a so-called “badger” being self- propelled and comprising a drilling motor (9) in front of said housing (1), a compactor (91) for compacting drilled rock fragments behind said housing in said borehole, and an unwinding cable (20) stored in said housing (1) and extending in said compacted drilled rock fragments to the borehole surface .
  • Fig. 6 illustrates a similar arrangement but wherein the "badger” receives laser light from a laser source ⁇ 5) arranged topsides, and with a Raman detector in the badger.
  • the Raman detector may be arranged topsides so as for the "badger” to transmit the collected Raman-scattered light through an optical fibre cable to the surface.
  • This instrument setup with the laser source and possibly with the Raman spectroscope may also be used for the instrument irrespective of whether the connection to the surface is through a optical fibres in a "badger” umbilical, or in a logging slickline string, a coiled tubing, a rigid fibre reinforced rod cable, or wherein optical fibres are arranged in a drillstring.
  • the borehole instrument system of is provided with said optical fibre arranged in a slickline metal mantled cable (13) coiled on a drum (11) and with the Raman detector (8) arranged in the housing (1), the Raman detector (8) transmitting measurements to the surface via an electrical or optical signal on a signal line (22).
  • a signal line 22
  • this setup may be embodied as illustrated in Fig. 7 with the Raman scattered signal transmitted from the window (6, 62) in the housing (1) through said second optical fibre or fibres (22) to the topsides where the Raman spectroscope analyzes the scattered signal in order to detect the Raman frequencies.
  • Fig. 8 is an illustration of a "shoe" portion of the housing (1) arranged for scraping against the borehole wall and provided with a leading edge below the window ⁇ 6, 61, 62) and a trailing protrusion so as to form a spacing of 0 to 0,5 mm between the window and the rock surface.
  • a shoe will be able to penetrate the mudcake on the borehole wall and there will be a thin film of borehole or formation fluid between the wall and the window.
  • the laser beam may arrive from the local laser or via a fibre optical cable and run through the window, pass through the local liquid as described for Fig. 8, and illuminate one or more mineral grains on the borehole wall. A small proportion of the illuminated molecules, about one in a million, will instantaneously provide
  • Raman scattering with a wavelength different from the laser beam's wavelength.
  • the Raman scattering may be separated from other scattering through filters or pulsed laser use and pulsed sampling, or through filtering.
  • the Raman scattering is received through the window and may be spread into a spectrum through the use of a prism or a grating to a light detector such as a CCD.
  • the Raman scattered light is transferred from the window through an optical fibre ⁇ 22) in a cable to the surface Raman spectroscope ⁇ 8) at the topsides .
  • Fig. 9 illustrates roughly the present invention combined with a drillstring.
  • the housing ⁇ 1) with the borehole instrument system of the present invention may be arranged near the drill bit of a drillstring.
  • the laser beam may be sent out from a local laser or event through a laser arranged further up and transmitted via an optical fibre in the assembled drilling string. Further, the collected Raman-scattered light may be analysed in a locally arranged Raman detector and analyser in the housing in the

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Remote Sensing (AREA)
  • Geophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

The invention is a borehole instrument system comprising a housing (1) in a borehole (B), the housing (1) provided with an optical window (6, 61) for guiding a low-energy laser beam (L) induced in a laser (5) towards a borehole wall (w), and a lens (6, 62) for collecting Raman scattered light (R) induced by the laser beam (L) and transmitting the Raman scattered light (R) to a Raman detector (8), said Raman scattered light for use for identifying at least one mineral of said borehole wall.

Description

A BOREHOLE INSTRUMENT SYSTEM FOR RAM AM SCATTERING
Introduction
The present invention relates to a borehole instrument system with a Raman spectroscopy device comprising a low-energy laser source and a Raman detector for Raman scattered photons. The Raman spectroscopy detector requires a monochromatic filter in order to remove Rayleigh scattering which is of higher intensity than the Raman scattering.
The Raman spectroscopy device may be used for identifying the Raman shift between the transmitted and received photons, which is assumed to be related to covalent bondings of illuminated minerals or fluids in the borehole, providing thus enabling identification of minerals in the borehole wall or in the drilling mud, or chemical components in the mud or petroleum fluids in the borehole wall.
Background art
Raman spectroscopy has been tried on minerals collected from the shaker screen or from the mud system topsides in general, and this may provide important information about distinguishing mineral compositions of cuttings and cavings so as to drill more properly. However, this requires the cuttings or cavings rock fragments to be transported to the mud shaker topsides, which requires transport time from the borehole to the topsides.
WO2008/063945 describes a downhole apparatus for determining properties of a geological formation around the borehole, with a packer for sealing and isolating a region of the borehole wall and for sucking in a sample of the formation fluid through a flowline into the device. Inside the device is a measurement cell illuminated by a laser beam and a Raman scattering detector. Properties of the geological formations, i.e. through properties of the extracted fluid. In page 14 the WO-publication describes a tunable laser device used downhole, but which is not properly operating at the ambient temperatures of the borehole without a thermoelectric cooling device. In page 15, the WO-publication describes a cooling device to minimize thermal noise of a CCE detector, assumedly due to the high ambient temperature of the borehole.
Brief summary of the invention The present invention defined in the attached claim 1 is illustrated broadly in Fig. 1 and is a borehole instrument system comprising a housing (1) in a borehole (B) , said housing (1) provided with an optical window (6, 61) for guiding a low-energy laser beam (L) induced in a laser (5) towards a borehole wall (w) , and a lens (6, 62) for collecting Raman scattered light (R) induced by said laser beam (L) and transmitting said Raman scattered light (R) to a Raman detector (8) arranged for identifying at least one mineral of said borehole wall. Further advantageous embodiments of the invention are defined in the dependent claims . Some embodiments have the laser topsides and some even have the Raman detector topsides, using a logging cable or intervention string with one, two or more optical fibres.
In other words, the present invention comprises a downhole logging tool for a petroleum well, wherein the logging tool has a laser beam to shine out through a window to illuminate the borehole wall, and a Raman detector to detect the Raman scattered light from the borehole wall and to make a Raman spectrogram for detecting peaks that characterizes the covalent bondings in the electron cloud of the minerals of the borehole wall. An important feature of an embodiment of the invention is that most components of the instrument, namely at least the laser and possibly also the Raman detector may be arranged topsides, near the surface of the Earth and that signal transmission is through a logging string with optical fibres for the laser light and possibly also the Raman scattered light.
An advantage of arranging the laser at the surface is the reduced ambient temperature of the laser device, which allows it to operate without any cooling device. A similar advantage arises when using a CCD detector at the topsides as part of the Raman detector: the thermal noise in the detected signal is reduced: the present invention does away with any and both of those cooling devices.
Brief Figure captions
Fig. 1 illustrates a broadly defined unspecified arrangement of a laser beam {L) sent through a window from a housing (1) in a borehole and light (R) of Raman scattered photons received in the housing.
Fig. 2 illustrates the laser (5) and the Raman detector (8) in the instrument (1) in the borehole (B) .
Fig. 3 illustrates the laser {5) topsides of the borehole and a first optical fibre (2) extending from the laser (5) to the borehole instrument {1) .
Fig. 4 illustrates a carbon fibre rod (10) comprising the first optical fibre (2) coiled on a drum {11) and with the Raman detector {8) arranged in the downhole housing {1), the Raman detector (8) transmitting measurements to the surface via an electrical or optical signal on a signal line (22). Fig. 4 also shows an injector head {14) for running the rod {10) or a slickline metal mantled cable {13) in or out of the well. Fig. 5 illustrates the borehole instrument system of the invention wherein said Raman detector (8) is arranged in said housing {1), said housing {1) arranged as a so-called "badger" being self- propelled and comprising a drilling motor {9) in front of said housing (1), a compactor {91) for compacting drilled rock fragments behind said housing in said borehole, and an unwinding cable (20) stored in said housing {1) and extending in said compacted drilled rock fragments to the borehole surface .
Fig. 6 illustrates a similar arrangement but wherein the "badger" receives laser light from a laser source {5) arranged topsides, and with a Raman detector in the badger.
Fig. 7 illustrates an embodiment of the invention wherein a laser source is arranged topside, transmitting a laser beam via an optical fibre {2, 21) to the housing {1) downhole further illuminating the borehole wall via a window (6, 61, 62) and wherein the Raman scattering received in the window (6, 6a, 62) is transmitted back via a second optical fibre (2, 22) to the topsides to a Raman spectroscope .
Fig. 8 is an illustration of a "shoe" portion of the housing (1) arranged for scraping against the borehole wall. Fig. 9 illustrates roughly the present invention combined with a drillstring.
Embodiments of the invention
The present invention is illustrated broadly in Fig. 1 and is a borehole instrument system comprising a housing {1) in a borehole {B) , said housing {1) provided with an optical window {6, 61) for guiding a low-energy laser beam (L) induced in a laser (5) towards a borehole wall (w) , and a lens {6, 62) for collecting Raman scattered light {R) induced by said laser beam {L) and transmitting said Raman scattered light (R) to a Raman detector {8) . The Raman detector (8) is connected to a processor arranged for identifying at least one mineral of said borehole wall based on the detected frequencies of the Raman scattered signal. The window or lens {6, 61, 62) may be made in sapphire. Fig. 1 does not identify the position of the laser source nor the Raman detector, even though it is assumed that due to the low intensity of the Raman scattered photons, the Raman detector (8) could advantageously be near the source of the Raman scattered photons, i.e. in the housing (1) in the borehole in order to reduce the risk of attenuation of the light signal.
It is imagined that in an embodiment of the present invention a laser source {5, 51) is arranged in the housing (1) in said
borehole .
In an embodiment of the invention, the low-energy laser beam (L) is induced by a laser {5, 52) topsides of said borehole, said laser beam {L) transmitted through a first optical fibre (2, 21) to the housing and through said window (6) .
The borehole instrument system is in an embodiment arranged with said optical fibre in a fibre reinfored semi-rigid rod (10) such as a carbon fibre or glass fibre rod, stored on a drum (11) and connected to said laser {5, 52) topsides.
Fig. 5 illustrates the borehole instrument system of the invention wherein said Raman detector (8) is arranged in said housing (1), said housing {1) arranged as a so-called "badger" being self- propelled and comprising a drilling motor (9) in front of said housing (1), a compactor (91) for compacting drilled rock fragments behind said housing in said borehole, and an unwinding cable (20) stored in said housing (1) and extending in said compacted drilled rock fragments to the borehole surface .
Fig. 6 illustrates a similar arrangement but wherein the "badger" receives laser light from a laser source {5) arranged topsides, and with a Raman detector in the badger. In a further developed system also the Raman detector may be arranged topsides so as for the "badger" to transmit the collected Raman-scattered light through an optical fibre cable to the surface. This instrument setup with the laser source and possibly with the Raman spectroscope may also be used for the instrument irrespective of whether the connection to the surface is through a optical fibres in a "badger" umbilical, or in a logging slickline string, a coiled tubing, a rigid fibre reinforced rod cable, or wherein optical fibres are arranged in a drillstring.
In an embodiment of the invention the borehole instrument system of is provided with said optical fibre arranged in a slickline metal mantled cable (13) coiled on a drum (11) and with the Raman detector (8) arranged in the housing (1), the Raman detector (8) transmitting measurements to the surface via an electrical or optical signal on a signal line (22). This is illustrated in Fig. 4. As described above, this setup may be embodied as illustrated in Fig. 7 with the Raman scattered signal transmitted from the window (6, 62) in the housing (1) through said second optical fibre or fibres (22) to the topsides where the Raman spectroscope analyzes the scattered signal in order to detect the Raman frequencies.
Fig. 8 is an illustration of a "shoe" portion of the housing (1) arranged for scraping against the borehole wall and provided with a leading edge below the window {6, 61, 62) and a trailing protrusion so as to form a spacing of 0 to 0,5 mm between the window and the rock surface. Such a shoe will be able to penetrate the mudcake on the borehole wall and there will be a thin film of borehole or formation fluid between the wall and the window. The laser beam may arrive from the local laser or via a fibre optical cable and run through the window, pass through the local liquid as described for Fig. 8, and illuminate one or more mineral grains on the borehole wall. A small proportion of the illuminated molecules, about one in a million, will instantaneously provide
Raman scattering with a wavelength different from the laser beam's wavelength. The Raman scattering may be separated from other scattering through filters or pulsed laser use and pulsed sampling, or through filtering. The Raman scattering is received through the window and may be spread into a spectrum through the use of a prism or a grating to a light detector such as a CCD. In an embodiment, indicated in Fig. 8, the Raman scattered light is transferred from the window through an optical fibre {22) in a cable to the surface Raman spectroscope {8) at the topsides . Fig. 9 illustrates roughly the present invention combined with a drillstring. The housing {1) with the borehole instrument system of the present invention may be arranged near the drill bit of a drillstring. The laser beam may be sent out from a local laser or event through a laser arranged further up and transmitted via an optical fibre in the assembled drilling string. Further, the collected Raman-scattered light may be analysed in a locally arranged Raman detector and analyser in the housing in the
drillstring in the borehole, or transmitted through an optical fibre to further up to a topsides arranged Raman spectroscope.

Claims

Claims
1. A borehole instrument system comprising a housing (1) in a borehole (B) , said housing (1) provided with an optical window (6, 61) for guiding a low-energy laser beam (L) induced in a laser (5) towards a borehole wall (w) , and a lens (6, 62) for collecting Raman scattered light (R) induced by said laser beam (L) and transmitting said Raman scattered light (R) to a Raman detector (8) which is connected to a processor arranged for identifying at least one mineral of said borehole wall.
2. The borehole instrument system of claim 1, said low-energy laser beam (L) induced by a laser (5, 51) in said housing (1) in said borehole .
3. The borehole instrument system of claim 1, said low-energy laser beam (L) induced by a laser (5, 52) topsides of said borehole, said laser beam (L) transmitted through a first optical fibre (2, 21).
4. The borehole instrument system of claim 3, wherein said optical fibre is arranged in a fibre reinfored semi-rigid rod (10) such as a carbon fibre or glass fibre rod, stored on a drum (11) and connected to said laser (5, 52) .
5. The borehole instrument system of claim 3, wherein said optical fibre is arranged in a slickline metal mantled cable (13) coiled on a drum (11) and with the Raman detector (8) arranged in the housing (1), the Raman detector (8) transmitting measurements to the surface via an electrical or optical signal on a signal line (22) .
6. The borehole instrument system of claim 3, wherein said optical fibre is arranged in a coiled tubing (23) coiled on a drum (11) and with the Raman detector (8) arranged in the housing (1), the Raman detector (8) arranged for transmitting measurements to the surface via an electrical or optical signal on a signal line (22) .
7 . The borehole instrument system of claim 1 or 2, said Raman detector (8) arranged in said housing (1), said housing (1) arranged as a "badger" being self-propelled and comprising a drilling motor (9) in front of said housing (1), a compactor (91) for compacting drilled rock fragments behind said housing in said borehole, and an unwinding cable (20) stored in said housing (1) and extending in said compacted drilled rock fragments to the borehole surface.
8. The borehole instrument system of claim 1 or 7, said low-energy laser (5, 51) arranged in said housing (1) .
9. The borehole instrument syystem of any of the preceding claims, wherein the laser beam is emitted from the housing (1) arranged near the drillbit in a drillstring in the borehole.
10. The borehole instrument system of claim 9, wherein the laser beam is created topsides in a laser, and transmitted downhole through an optical fibre or fibres in the drillstring.
11. The borehole instrument system of claim 9, wherein the Raman- scattered light is received to the housing (1) .
12. The borehole instrument system of claim 11, wherein the raman- scattered light is received to the housing (1) and transmitted further through an optical fibre to a Raman spectroscope topsides.
PCT/NO2012/050256 2011-12-30 2012-12-27 A borehole instrument system for ramam scattering WO2013100770A2 (en)

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US201161581701P 2011-12-30 2011-12-30
NONO20111781 2011-12-30
NO20111781 2011-12-30
US61/581,701 2011-12-30

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WO2013100770A3 WO2013100770A3 (en) 2014-03-20

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CN110454142A (en) * 2019-05-23 2019-11-15 王恒 A kind of cable transmission underground LR laser raman testing tool
CN117250179A (en) * 2023-07-27 2023-12-19 中国地质科学院矿产资源研究所 Mobile Raman detection system and method for field site

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CN107071307B (en) * 2017-02-20 2019-07-16 重庆大学 A kind of real-time data acquisition device and method inhibiting CCD noise

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