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WO2014089115A1 - Capteurs de méthane immersibles - Google Patents

Capteurs de méthane immersibles Download PDF

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Publication number
WO2014089115A1
WO2014089115A1 PCT/US2013/072920 US2013072920W WO2014089115A1 WO 2014089115 A1 WO2014089115 A1 WO 2014089115A1 US 2013072920 W US2013072920 W US 2013072920W WO 2014089115 A1 WO2014089115 A1 WO 2014089115A1
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WIPO (PCT)
Prior art keywords
methane
immersible
radiation
fluid medium
water
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.)
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PCT/US2013/072920
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English (en)
Inventor
Andrew C. BARTON
Alex MORROW
Jason A. Schaefer
William A. Ivancic
Russell H. Barnes
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Battelle Memorial Institute Inc
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Battelle Memorial Institute Inc
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Publication of WO2014089115A1 publication Critical patent/WO2014089115A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions

Definitions

  • Methane CH 4 (g)
  • Methane gas is a colorless, odorless gas, and is the chief constituent of natural gas. Methane gas is especially prevalent in coal beds, but occurs in non-coal rocks as well. Methane gas occurs naturally in the subsurface, accumulating in voids within the rock and as dissolved gas in groundwater. Methane can enter a well system through damaged or corroded well casing, improperly sealed well casing, uncased formations, and as dissolved gases being released from groundwater present in the well. Because methane may be dissolved in groundwater, it may not leave the well water until it arrives at the faucet, resulting in the accumulation of gas in the home. Thus, a risk exists for methane overexposure.
  • Symptoms of methane over-exposure may include difficulty breathing, suffocation, dehydration, nausea, vomiting, dizziness, confusion, blurred vision, and increased heart rate.
  • methane gas is flammable and, in the right mixture with air, can be highly explosive. Thus, detection of methane gas in well systems is important.
  • Methane detection systems exist. For example, one conventional methane detection system is the well-known "bottle test.” Other conventional methane detection systems include catalytic combustion detectors, flame ionization detectors, and semiconductor-type detectors. More recently, methane gas has been detected spectroscopically, e.g., by infrared optical analysis. SUMMARY
  • an immersible detection system for detecting the existence and concentration of methane gas in water.
  • the immersible detection system may include:
  • a radiation source tuned to emit radiation at a wavelength having a linewidth which embraces at least one significant absorption line of the 2v 3 band of methane
  • a detector configured to receive the radiation
  • a multi-pass mirror system configured to direct the radiation emitted by the radiation source to the detector
  • a signal process and control unit operatively connected with the detector, for analyzing the received radiation to determine the existence and concentration of methane gas.
  • a water-immersible methane sensor is provided.
  • the water- immersible methane sensor may include:
  • a light emitting diode tuned to emit light with a peak wavelength of between about 1.60 ⁇ and about 1.69 ⁇ ;
  • a detector configured to receive the light
  • a membrane including a silicone polymer that is substantially gas permeable and substantially water impermeable;
  • an immersible detection system for detecting the existence and concentration of methane gas in water.
  • the immersible detection system may include:
  • a radiation source operatively connected with the gas chamber and tuned to emit radiation at a wavelength having a linewidth which embraces at least one significant absorption line of the 2v 3 band of methane;
  • a detector configured to receive the radiation
  • a gas permeable, water impermeable membrane layer operatively connected with the gas chamber and configured to allow methane gas to enter the gas chamber;
  • a signal process and control unit operatively connected with the detector, for analyzing the received radiation to determine the existence and concentration of methane gas.
  • a method for detecting the presence and concentration of methane gas in water is provided.
  • the method may include:
  • the methane detection system may include:
  • a light emitting diode tuned to emit light with a peak wavelength of between about 1.60 ⁇ and about 1.69 ⁇ ;
  • a detector to receive the light
  • a multi-pass mirror system configured to direct the light emitted by the light emitting diode to the detector
  • an immersible detection system for determining an existence and concentration of methane included by a fluid medium.
  • the immersible detection system may include a radiation source.
  • the radiation source may be tuned to emit radiation at a wavelength having a linewidth which embraces at least one significant absorption line of a 2v3 band of methane.
  • the immersible detection system may include a methane permeable, water impermeable membrane layer.
  • the methane permeable, water impermeable membrane layer may be configured to admit at least a portion of the methane included by the fluid medium into the immersible detection system.
  • the admitted methane may absorb at least a portion of the radiation at the at least one significant absorption line of the 2v3 band of methane.
  • the immersible detection system may include a detector configured to receive the radiation.
  • the immersible detection system may include a signal process and control unit operatively connected to the detector.
  • the signal process and control unit may be configured to analyze the radiation to determine the existence and concentration of the methane included by the fluid medium according to absorption at the at least one significant absorption line of the 2v3 band of methane.
  • a water-immersible methane sensor for determining an existence and concentration of methane included by a fluid medium.
  • the water- immersible methane sensor may include a light emitting diode.
  • the light emitting diode may be tuned to emit light with a peak wavelength between about 1.60 ⁇ and about 1.69 ⁇ .
  • the water-immersible methane sensor may include a detector configured to receive the light.
  • the water-immersible methane sensor may include a membrane that includes a silicone polymer.
  • the membrane may be permeable to methane and substantially impermeable to water.
  • the membrane may be configured to admit at least a portion of the methane included by the fluid medium into the water-immersible methane sensor.
  • the admitted methane may absorb at least a portion of the light in at least one significant absorption line of a 2v3 band of methane.
  • the water-immersible methane sensor may include a signal process and control unit operatively connected to the detector.
  • the signal process and control unit may be configured to analyze the light to determine the existence and concentration of the methane included by the fluid medium according to absorption at the at least one significant absorption line of the 2v3 band of methane.
  • an immersible detection system for detecting the existence and concentration of methane included by a fluid medium.
  • the immersible detection system may include a chamber.
  • the immersible detection system may include a radiation source operatively connected with the chamber.
  • the radiation source may be tuned to emit radiation at a wavelength having a linewidth which embraces at least one significant absorption line of methane.
  • the immersible detection system may include a methane permeable, water impermeable membrane layer.
  • the methane permeable, water impermeable membrane layer may be operatively connected to the chamber.
  • the methane permeable, water impermeable membrane layer may be configured to admit at least a portion of the methane included by the fluid medium to the chamber.
  • the admitted methane may absorb at least a portion of the radiation at the at least one significant absorption line of methane.
  • the immersible detection system may include a detector configured to receive the radiation.
  • the immersible detection system may include a multi-pass mirror system including a concave mirror, e.g., a concave spherical mirror.
  • the multi-pass mirror system may be configured to direct the radiation emitted by the radiation source through the admitted methane in at least two passes.
  • the admitted methane may absorb at least a portion of the radiation at the at least one significant absorption line of methane.
  • the multi-pass mirror system may be configured to direct at least a portion of the radiation not absorbed by the admitted methane to the detector.
  • the immersible detection system may include a signal process and control unit operatively connected to the detector.
  • the signal process and control unit may be configured to analyze the radiation to determine the existence and concentration of the methane included by the fluid medium according to absorption at the at least one significant absorption line of methane.
  • a method for detecting the presence and concentration of methane included by a fluid medium may include separating at least a portion of the methane from the fluid medium.
  • the method may include directing radiation through the methane separated from the fluid medium in at least two passes.
  • the radiation may be at a wavelength having a linewidth which embraces at least one significant absorption line of a 2v3 band of methane.
  • the admitted methane may absorb at least a portion of the radiation in the at least one significant absorption line of the 2v3 band of methane.
  • the method may include selectively detecting absorption of the radiation at the at least one significant absorption line of the 2v3 band of methane.
  • the method may include determining the existence and concentration of the methane included by the fluid medium according to the selectively detected absorption of the radiation at the at least one significant absorption line of the 2v3 band of methane.
  • FIG. 1 is a cross-sectional side view of an example immersible methane sensor 100 showing the electronics and optical absorption sections of the sensor;
  • FIG. 2 illustrates another view of example immersible methane sensor 100 wherein the electronics and optical absorption sections of the sensor are separated from the outer tube;
  • FIG. 3 is a perspective view of example immersible methane sensor 100 showing the electrical cable port and the spherical mirror of the multi-pass optical absorption mirror system;
  • FIG. 4 is a perspective view of the assembled example immersible methane sensor 100 showing o-ring seals and the gas permeation membrane;
  • FIG. 5 illustrates an example IR detector suitable for use with the immersible methane sensors disclosed herein;
  • FIG. 6 A illustrates an exploded view of the electronics section-side of the support block that at least partially divides the electronics section from the optical absorption section of example immersible methane sensor 100;
  • FIG. 6B illustrates an exploded view of the optical absorption section-side of the support block that at least partially divides the electronics section from the optical absorption section of example immersible methane sensor 100;
  • FIG. 7 illustrates the mirror mosaic portion of the multi-pass optical absorption mirror system of example immersible methane sensor 100
  • FIG. 8 is a flow chart of an example method for detecting the presence and concentration of methane gas in water
  • FIG. 9A is a graph showing methane diffusion into an example sensor in a test fixture as a function of time, the example sensor lacking the membrane layer and a porous stainless steel support; temperature at the example sensor is also shown as a function of time;
  • FIG. 9B is a graph showing methane diffusion into an example sensor as a function of time, the example sensor including the membrane layer and a porous stainless steel support; temperature at the example sensor is also shown as a function of time;
  • FIG. 9C is a graph showing a reverse methane diffusion test, where methane loaded into an example sensor exits the sensor as a function of time, the example sensor including the membrane layer and a porous stainless steel support; temperature at the example sensor is also shown as a function of time;
  • FIG. 9D is a graph showing the forward methane diffusion test of FIG. 9C, but with temperature correction applied to the data.
  • FIG. 9E is a graph showing the forward methane diffusion test of FIG. 9D, but with the temperature corrected voltage signal converted to a dissolved methane concentration.
  • FIG. 9F is a graph showing temperature-corrected data for the forward methane diffusion test of FIG. 9D.
  • the present embodiments disclose relatively small, compact, inexpensive systems and methods for detecting and determining the concentration of dissolved gases in water, including down-hole detection and determination of the concentration of dissolved methane gas in underground well water.
  • the method of operation for the sensor involves separating dissolved methane gas from the water by gas permeation through a hydrophobic polymer membrane that passes methane gas while rejecting the passage of water.
  • a longpath optical absorption measurement in the near-infrared optical range is used within the sensor to measure the methane collected in the gas phase.
  • the methane measurements are correlated to methane concentration in the surrounding water in contact with the permeation membrane using a Henry's Law mathematical relationship as known in the art.
  • FIGS. 1- 7 Details of example embodiments of the methane sensor are illustrated in FIGS. 1- 7.
  • a cross-sectional side view of which is depicted in FIG. 1 an immersible detection system 100 is provided for detecting the existence and concentration of methane gas in water.
  • an immersible detection system 100 is provided for detecting the existence and concentration of methane gas in water.
  • immersible detection system 100 may include a gas chamber 105, a radiation source 110, tuned to emit radiation through gas chamber 105 at a wavelength having a fluorescence linewidth which embraces at least one significant absorption line of the 2v 3 band of methane; a detector 120 configured to receive the radiation; a gas permeable, water impermeable membrane layer 130; a multi-pass mirror system including a spherical mirror 140, located within the gas chamber 105 and configured to direct the radiation emitted by radiation source 110 through gas chamber 105 to detector 120; and a signal process and control unit (not shown), operatively connected with detector 120, for analyzing the received radiation to determine the existence and concentration of methane gas.
  • gas chamber 105 is operatively connected with radiation source 110 and gas permeable, water impermeable membrane layer 130.
  • radiation source 110, detector 120, and a mirror mosaic portion (not shown) of the multi-pass mirror system are mounted on a mosaic mirror support block 145.
  • a thermistor may be used to provide the temperature of the methane gas in gas chamber 105 and to correct calculations for temperature variation effects on radiation source 110, detector 120, and absorption coefficients for methane.
  • Outputs from detector 120 may be processed using signal processing electronics and a microprocessor in the electronics section 150 of sensor 100.
  • Software in the microprocessor with temperatures from the thermistor converts the spectroscopic measurements to methane pressure, and then through Henry's Law calculates the dissolved methane concentration in water.
  • Results from the dissolved methane measurements may be reported from sensor 100 through an electrical cable to an output box at ground level at or near the well-head.
  • a digital display on the output box provides continuous dissolved methane concentrations.
  • Outputs from the box can be relayed by wire or wireless. In one embodiment, an alarm may be triggered if threshold levels of methane gas are present.
  • Electrical power for detection system 100 may be supplied, for example, by an internal battery or remotely by a cable and output box located at the well head.
  • immersible detection system 100 may be configured in two primary sections— electronics section 150 and an optical absorption section 160.
  • a radiation source 110 and detector 120 may be operatively connected with both electronics section 150 and optical absorption section 160 through support block 145.
  • FIG. 2 illustrates another view of an example immersible methane sensor 100 wherein electronics section 150 and optical absorption section 160 of sensor 100 are separated from an outer tube 170.
  • FIG. 3 is a perspective view of an example immersible methane sensor 100 showing an electrical cable port 180 and spherical mirror 140 of the multi-pass optical absorption system.
  • housing 170 may be contoured to allow for pipe travel, as shown in FIGS. 1-4.
  • housing 170 includes a metal cylindrical tube with an outer diameter of less than about 13 ⁇ 4 inches and a length of less than about nine inches. These dimensions are convenient for insertion into standard well pipes and natural gas wells. It should be noted that when not inserted in water, sensor 100 may be used for gas-phase measurements.
  • detection system 100 may be readily adapted, e.g., by use of different wavelengths and corresponding filters, to detect many other gases dissolved in water and other liquids. As an example, additional wavelengths may be emitted and filtered to monitor both methane and carbon dioxide in sea water. Further, detection system 100 may be coupled with other water quality parameter sensors, e.g., TDS, chloride, and pH sensors.
  • water quality parameter sensors e.g., TDS, chloride, and pH sensors.
  • Methane has two strong absorption bands, or groups of lines, centered at 3.3 ⁇ (V? band) and 7.6 ⁇ (v ⁇ band). Methane has another strong absorption band located at 1.64 to 1.70 um (2v 3 band).
  • a suitable LED may emit light with a peak wavelength of between about 1.60 ⁇ and about 1.69 ⁇ .
  • a suitable LED may emit light with a peak wavelength of about 1.65 ⁇ .
  • One example of a suitable LED may be the "LED16FC" manufactured by Roithner Lasertechnik GmbH in Vienna, Austria. The LED16FC has an output wavelength of from about 1500 to about 1900 nm, with a peak wavelength of between about 1600 nm and about 1690 nm, and particularly at about 1650 nm.
  • radiation source 110 may include an LED with a collection lens on its face.
  • the collection lens helps gather more of the emitted energy and limit the angular extent of the LED's divergence.
  • Detector 120 may include, for example, a single or multi-element detector with separate narrow bandpass optical filters.
  • detector 120 may be a two element detector with a filter wavelength for the filters of about 1670 nm for the methane absorption channel, and 1550 nm for zero absorbance correction (that is, as reference to correct for instrument drift).
  • the 1670 nm wavelength is associated with the Q-branch manifolds of the 2v 3 vibration band of methane.
  • the zero absorbance channel is between the 1900 and 1400 nm bands of water vapor where water absorbance is minimal.
  • detector 120 may be a lead sulfide quad cell (four element) detector as shown in FIG. 5 and as manufactured by Cal-Sensors, Inc. in Santa Rosa, California.
  • detector 120 may have a first element having a filter wavelength of between about 1647 nm and 1691 nm, with a center wavelength of about 1670 nm (e.g., a NB-1670-023 optical filter manufactured by Spectrogon in Taby, Sweden); a second element having a filter wavelength of between about 1516.1 nm and 1582.7 nm, with a center wavelength of about 1550 nm (e.g., a NB-1552-031 optical filter manufactured by Spectrogon); a third element having a filter wavelength of between about 1627 nm and 1664 nm, with a center wavelength of about 1646 nm (e.g., a NB- 1648-019 optical filter manufactured by Spectrog
  • detector 120 may further include a collection lens, such as, for example, a TECHSPEC® N-BK7 Half-Ball Lens as manufactured by Edmund Optics Inc. in Barrington, New Jersey. Such a collection lens is shown in FIG. 5 as item 190.
  • a collection lens such as, for example, a TECHSPEC® N-BK7 Half-Ball Lens as manufactured by Edmund Optics Inc. in Barrington, New Jersey. Such a collection lens is shown in FIG. 5 as item 190.
  • Detection sensitivity for a particular wavelength region may be optimized by adjusting the separation between spherical mirror 140 and the mosaic mirrors of the multipass mirror system.
  • membrane layer 130 allows the transfer of methane into and out of detection system 100, while rejecting the passage of water. As the dissolved methane concentration in the water varies up and down, methane passes in and out of the gas chamber through the membrane.
  • membrane layer 130 may include any composition that has a high permeability for methane and high hydrophobicity to reject the passage of water.
  • membrane may include a porous, super-hydrophobic silicone polymer manufactured by Millipore Corporation in Billerica, Massachusetts.
  • Another example membrane may include polydimethylsiloxane. The membrane parameters are chosen to balance maximum diffusion of methane with the necessary strength to withstand water pressure and other forces in deep well environments. Multi-Pass Mirror System
  • the LED described herein is directed toward a relatively large (e.g., about 1 inch in some embodiments) primary mirror (e.g., spherical mirror 140), which collects the divergent energy from the LED and focuses it back onto a small mirror back near (but slightly displaced from) the LED.
  • This small mirror redirects the light toward another small mirror, which then redirects the light back toward the primary mirror.
  • This process is repeated multiple times (each reflection off of the primary mirror is pointed toward a different set of small mirrors) and results in the establishment of a long path length through the volume of gas contained in the gas chamber (e.g., gas chamber 105). At the end of this repeated reflection optical path, the light is directed to the detector (e.g., detector 120).
  • FIG. 6a illustrates an exploded view of the electronics section-side of support block 145 that at least partially divides electronics section 150 from optical absorption section 160 of example immersible methane sensor 100.
  • FIG. 6b illustrates an exploded view of the optical absorption section-side of support block 145.
  • an example mirror mosaic 140' is shown which corresponds to the "small mirrors" described herein.
  • FIG. 7 illustrates another view of the mirror mosaic portion 140' of the optical absorption mirror system of example immersible methane sensor 100.
  • the multi-pass mirror system produces a long optical absorption path length within a small volume (in one embodiment, the gas chamber has a volume of approximately 73 cm ) to provide the detection sensitivity for methane in water in the subparts per million concentration range— a surprisingly good result.
  • the primary mirror is separated from the mosaic by about 10 cm, with the overall length of the mirror system in the sensor being about 12 cm. Sixteen passes through such a system provides an optical absorption pathlength of about 1.63 meters.
  • the multi-pass mirror system allows for a compact (and inexpensive) design that can be used to perform down-hole well measurements at very high sensitivity and response time.
  • an immersible detection system for detecting the existence and concentration of methane gas in water.
  • the immersible detection system may include: a radiation source, tuned to emit radiation at a wavelength having a fluorescence linewidth which embraces at least one significant absorption line of the 2v 3 band of methane; a detector configured to receive the radiation; a gas permeable, water impermeable membrane; a multi-pass mirror system configured to direct the radiation emitted by the radiation source to the detector; and a signal process and control unit, operatively connected with the detector, for analyzing the received radiation to determine the existence and concentration of methane gas.
  • a water-immersible methane sensor may include: a light emitting diode tuned to emit light with a peak wavelength of between about 1.60 ⁇ and about 1.69 ⁇ ; a detector configured to receive the light; a membrane including a silicone polymer that is substantially gas permeable and substantially water impermeable; a multi-pass mirror system configured to direct the light to the detector; and a signal process and control unit, operatively connected with the detector, for analyzing the received light to determine the existence and concentration of methane in water.
  • an immersible detection system for detecting the existence and concentration of methane gas in water.
  • the immersible detection system may include: a gas chamber; a radiation source operatively connected with the gas chamber and tuned to emit radiation at a wavelength having a fluorescence linewidth which embraces at least one significant absorption line of the 2v 3 band of methane; a detector configured to receive the radiation; a gas permeable, water impermeable membrane layer operatively connected with the gas chamber and configured to allow methane gas to enter the gas chamber; a multi-pass mirror system contained within the gas chamber; and a signal process and control unit, operatively connected with the detector, for analyzing the received radiation to determine the existence and concentration of methane gas.
  • FIG. 8 is a flow chart of an example method 800 for detecting the presence and concentration of methane gas in water.
  • a methane detection system e.g., methane detection system 100
  • water step 810
  • the methane detection system may include: a light emitting diode (e.g., radiation source 110) tuned to emit light with a peak wavelength of between about 1.60 ⁇ and about 1.69 ⁇ ; a detector (e.g., detector 120) configured to receive the light; a gas permeable, water impermeable membrane layer (e.g., membrane 130) configured to pass methane gas from the water into a gas chamber (e.g., gas chamber 105) within the methane detection system, while rejecting the liquid water; and a multi-pass mirror system configured to direct the light emitted by the light emitting diode through the gas chamber to the detector; and analyzing the received light using a signal process and control unit which is operatively connected to the detector (step 820).
  • a light emitting diode e.g., radiation source 110
  • a detector e.g., detector 120
  • a gas permeable, water impermeable membrane layer e.g., membrane 130
  • dissolved methane released from the water in contact with the surface of the hydrophobic membrane penetrates through the membrane into the gas chamber where the spectroscopic absorption measurement provides a methane pressure which is correlated to a dissolved methane concentration using an established Henry's Law relationship.
  • FIG. 9A is a graph 900 showing methane diffusion into an example sensor as a function of time.
  • the example sensor for which data is shown in FIG. 9A lacks a membrane layer and a porous stainless steel support.
  • the test of FIG. 9A was performed in the gas phase to measure diffusion time through the test fixture and example sensor; here, response time is approximately three hours.
  • Voltage signal 902 represents sensitivity of the example sensor to methane.
  • Voltage 902 may be converted to mg/L of methane, taking into account the effect of temperature 906, also graphed as a function of time.
  • Dotted line 904 indicates the point in time, about 1.9 hours, when methane was added.
  • FIG. 9B is a graph 910 showing methane diffusion into an example sensor as a function of time.
  • the example sensor for which data is shown in FIG. 9B includes a membrane layer and a porous stainless steel support.
  • the test of FIG. 9B was performed in the gas phase to measure diffusion time through the example sensor; here, response time is approximately three hours, taking into account a response time of six hours minus the three hour fixture diffusion time of the experiment in FIG. 9A.
  • Voltage signal 912 represents sensitivity of the example sensor to methane.
  • Voltage 912 may be converted to mg/L of methane, taking into account the effect of temperature 916, also graphed as a function of time.
  • Dotted line 914 indicates the point in time, about 3.7 hours, when methane was added.
  • FIG. 9C is a graph 920 showing a reverse methane diffusion test, where methane pre-loaded into an example sensor exits the sensor as a function of time.
  • the example sensor for which data is shown in FIG. 9C includes a membrane layer and a porous stainless steel support.
  • the test of FIG. 9C was performed by pre-loading the example sensor with methane, and placing the example sensor in methane-free water in a nitrogen environment to measure diffusion time out of the example sensor.
  • Increasing voltage signal 922 over time shows that methane was diffusing out of the sensor.
  • Sensor temperature 924 and laboratory temperature 926 are also graphed as a function of time. Voltage signal 922 is not temperature corrected in FIG. 9C.
  • FIG. 9D is a graph 930 showing a forward methane diffusion test, where an example sensor is placed in methane-free water. After about 5 hours, the gas surrounding the water was loaded with methane to create an approximately 10 mg/L methane concentration in the water.
  • the example sensor for which data is shown in FIG. 9D includes a membrane layer and a porous stainless steel support. Decreasing voltage signal 932 over time shows that methane was diffusing into the sensor. Sensor temperature 934 and laboratory temperature 936 are also graphed as a function of time. Voltage signal 932 is not temperature corrected in FIG. 9D.
  • FIG. 9E is a graph 940 showing temperature-corrected data for the forward methane diffusion test of FIG. 9D, where an example sensor is placed in methane-free water. After about 5 hours, the gas surrounding the water was loaded with methane to create an approximately 10 mg/L methane concentration in the water.
  • the example sensor for which data is shown in FIG. 9E includes a membrane layer and a porous stainless steel support. Decreasing voltage signal 942 over time shows that methane was diffusing into the sensor. Sensor temperature 944 and laboratory temperature 946 are also graphed as a function of time. Voltage signal 942 is temperature corrected in FIG. 9E.
  • FIG. 9F is a graph 950 showing temperature-corrected data for the forward methane diffusion test of FIG. 9D, where an example sensor is placed in methane-free water. After about 5 hours, the gas surrounding the water was loaded with methane to create an approximately 10 mg/L methane concentration in the water.
  • the example sensor for which data is shown in FIG. 9E includes a membrane layer and a porous stainless steel support. Signal 952 corresponds to signal 942 from FIG. 9E, but converted to a dissolved methane concentration in mg/L.
  • an immersible detection system for determining an existence and concentration of methane included by a fluid medium is provided.
  • the immersible detection system may include a radiation source.
  • the radiation source may be tuned to emit radiation at a wavelength having a linewidth which embraces at least one significant absorption line of a 2v3 band of methane.
  • the immersible detection system may include a methane permeable, water impermeable membrane layer.
  • the methane permeable, water impermeable membrane layer may be configured to admit at least a portion of the methane included by the fluid medium into the immersible detection system.
  • the admitted methane may absorb at least a portion of the radiation at the at least one significant absorption line of the 2v3 band of methane.
  • the immersible detection system may include a detector configured to receive the radiation.
  • the immersible detection system may include a signal process and control unit operatively connected to the detector. The signal process and control unit may be configured to analyze the radiation to determine the existence and concentration of the methane included by the fluid medium according to absorption at the at least one significant absorption line of the 2v3 band of methane.
  • the immersible detection system may include a multi-pass mirror system.
  • the multi-pass mirror system may be configured to direct the radiation emitted by the radiation source through the admitted methane.
  • the radiation emitted by the radiation source may be directed through the admitted methane in at least two passes such that the admitted methane absorbs at least a portion of the radiation at the at least one significant absorption line of the 2v3 band of methane.
  • the multi-pass mirror system may be configured to direct at least a portion of the radiation not absorbed by the methane to the detector.
  • the multi-pass mirror system may further include a concave mirror, e.g., a concave spherical mirror.
  • the signal process and control unit may be configured to analyze the radiation to determine the existence and concentration of the methane included by the fluid medium selectively according to absorption at the at least one significant absorption line of the 2v3 band of methane.
  • the radiation source may include a light emitting diode.
  • the light emitting diode may be tuned to emit light with a peak wavelength of about 1.60 ⁇ , 1.61 ⁇ , 1.62 ⁇ , 1.63 ⁇ , 1.64 ⁇ , 1.65 ⁇ , 1.66 ⁇ , 1.67 ⁇ , 1.68 ⁇ , 1.69 ⁇ , or a range between about any two of the preceding values, for example, between about 1.60 ⁇ and about 1.69 ⁇ .
  • the light emitting diode may be tuned to emit light with a peak wavelength of about any one of the preceding values, for example, about 1.65 ⁇ .
  • the detector may include a filter configured to reject at least some radiation outside of the absorption line of the 2v3 band of methane.
  • detector may include at least two filter elements.
  • the first filter element may include a filter center wavelength of about 1.67 ⁇ .
  • the second filter element may include a filter center wavelength of about 1.55 ⁇ .
  • the detector may include at least four filter elements.
  • the first filter element may include a filter wavelength of between about 1647 nm and 1691 nm.
  • the second filter element may include a filter wavelength of between about 1516 nm and 1582 nm.
  • the third filter element may include a filter wavelength of between about 1627 nm and 1664 nm.
  • the fourth filter element may include a filter wavelength of between about 1699 nm and 1718 nm.
  • the methane permeable, water impermeable membrane layer may include a polydimethylsiloxane compound.
  • the methane permeable, water impermeable membrane layer may be supported by an underlying porous, gas permeable substrate.
  • the fluid medium may include one or more of: a gaseous mixture of the methane in air or the methane dissolved in an aqueous solution.
  • the fluid medium may include a gaseous mixture of the methane in air.
  • the fluid medium may include the methane dissolved in an aqueous solution.
  • the fluid medium may include one or more of: a liquid, a gas, a vapor, a subcritical fluid, or a supercritical fluid.
  • the fluid medium may include a liquid.
  • the fluid medium may include a gas.
  • the fluid medium may include a vapor.
  • the fluid medium may include a subcritical fluid.
  • the fluid medium may include a supercritical fluid.
  • the detector and signal process and control unit may be configured to determine the existence and concentration of the methane included by the fluid medium.
  • the fluid medium may be sampled to evaluate water quality associated with one or more of: conventional or unconventional oil and gas development, coal mining, landfill operations, wastewater treatment, chemical manufacturing, or industrial processes.
  • the fluid medium may be sampled to evaluate water quality associated with conventional oil and gas development.
  • the fluid medium may be sampled to evaluate water quality associated with unconventional oil and gas development.
  • the fluid medium may be sampled to evaluate water quality associated with coal mining.
  • the fluid medium may be sampled to evaluate water quality associated with landfill operations.
  • the fluid medium may be sampled to evaluate water quality associated with wastewater treatment.
  • the fluid medium may be sampled to evaluate water quality associated with chemical manufacturing, or industrial processes.
  • the immersible detection system may be configured to fit within a cylinder having a diameter in inches of about 1, 1.5. 2, 2.5, 3, 3.5, 4, 4.5, or 5, or any range between about any two of the preceding values, for example, between about 1 inch and about 4 inches.
  • the cylinder may have a diameter about any of the preceding values, for example, about two inches.
  • the cylinder may have a length in inches of about 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16, or any range between about any two of the preceding values, for example, between about 7 inches and about 12 inches.
  • the cylinder may have a diameter about any of the preceding values, for example, about 8 inches.
  • the cylinder may have a combination of any of the preceding values for the diameter and length, for example, a diameter of about 2 inches and a length of about eight inches.
  • the immersible detection system may include a lower methane detection limit in the fluid medium in mg/mL of at least about 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2., 1.3, 1.4, 1.5, or any range between about any two of the preceding values, for example, between about 0.01 mg/mL and about 0.1 mg/mL.
  • the immersible detection system may include a lower methane detection limit in the fluid medium of about any of the preceding values, for example, about 0.01 mg/ml; about 0.1 mg/mL; or about 1 mg/mL.
  • the immersible detection system may be configured to operate at a pressure in pounds per square inch absolute (psia) of about 0, 10, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, or any range between about any two of the preceding values, for example, between about between about 10 psia and 200 psia.
  • psia pounds per square inch absolute
  • the immersible detection system may be configured to operate at a temperature in ° C of about 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, or any range between about any two of the preceding values, for example, between about between about 0 ° C and about 50 ° C, or between about 5 ° C and about 30 ° C.
  • the immersible detection system may also include a heater configured to reduce condensation in the immersible detection system, for example, a resistive or thin film heater.
  • a water-immersible methane sensor for determining an existence and concentration of methane included by a fluid medium.
  • the water- immersible methane sensor may include a light emitting diode.
  • the light emitting diode may be tuned to emit light with a peak wavelength between about 1.60 ⁇ and about 1.69 ⁇ .
  • the water-immersible methane sensor may include a detector configured to receive the light.
  • the water-immersible methane sensor may include a membrane that includes a silicone polymer.
  • the membrane may be permeable to methane and substantially impermeable to water.
  • the membrane may be configured to admit at least a portion of the methane included by the fluid medium into the water-immersible methane sensor.
  • the admitted methane may absorb at least a portion of the light in at least one significant absorption line of a 2v3 band of methane.
  • the water-immersible methane sensor may include a signal process and control unit operatively connected to the detector.
  • the signal process and control unit may be configured to analyze the light to determine the existence and concentration of the methane included by the fluid medium according to absorption at the at least one significant absorption line of the 2v3 band of methane.
  • the water-immersible methane sensor may include a multipass mirror system.
  • the multi-pass mirror system may be configured to direct the radiation emitted by the radiation source to the admitted methane.
  • the admitted methane may absorb at least a portion of the radiation at the at least one significant absorption line of the 2v3 band of methane.
  • the multi-pass mirror system may be configured to direct at least a portion of the radiation not absorbed by the methane to the detector.
  • the multi-pass mirror system may include a concave mirror, e.g., a concave spherical mirror.
  • the signal process and control unit may be configured to analyze the radiation to determine the existence and concentration of the methane included by the fluid medium selectively according to absorption at the at least one significant absorption line of the 2v3 band of methane.
  • the light emitting diode may be tuned to emit light with a peak wavelength of about 1.60 ⁇ , 1.61 ⁇ , 1.62 ⁇ , 1.63 ⁇ , 1.64 ⁇ , 1.65 ⁇ , 1.66 ⁇ , 1.67 ⁇ , 1.68 ⁇ , 1.69 ⁇ , or a range between about any two of the preceding values, for example, between about 1.60 ⁇ and about 1.69 ⁇ .
  • the light emitting diode may be tuned to emit light with a peak wavelength of about any one of the preceding values, for example, about 1.65 ⁇ .
  • the detector may include a filter configured to reject at least some radiation outside of the absorption line of the 2v3 band of methane.
  • the detector may include at least two filter elements.
  • the first filter element may include a filter center wavelength of about 1.67 ⁇ .
  • the second filter element may include a filter center wavelength of about 1.55 ⁇ .
  • the detector may include at least four filter elements.
  • the first filter element may include a filter wavelength of between about 1647 nm and 1691 nm.
  • the second filter element may include a filter wavelength of between about 1516 nm and 1582 nm.
  • the third filter element may include a filter wavelength of between about 1627 nm and 1664 nm.
  • the fourth filter element may include a filter wavelength of between about 1699 nm and 1718 nm.
  • the membrane may include a polydimethylsiloxane compound.
  • the membrane may be supported by an underlying porous, gas permeable substrate.
  • the fluid medium may include one or more of: a gaseous mixture of the methane in air or the methane dissolved in an aqueous solution.
  • the fluid medium may include a gaseous mixture of the methane in air.
  • the fluid medium may include the methane dissolved in an aqueous solution.
  • the fluid medium may include one or more of: a liquid, a gas, a vapor, a subcritical fluid, or a supercritical fluid.
  • the fluid medium may include a liquid.
  • the fluid medium may include a gas.
  • the fluid medium may include a vapor.
  • the fluid medium may include a subcritical fluid.
  • the fluid medium may include a supercritical fluid.
  • the detector and signal process and control unit may be configured to determine the existence and concentration of the methane included by the fluid medium.
  • the fluid medium may be sampled to evaluate water quality associated with one or more of: conventional or unconventional oil and gas development, coal mining, landfill operations, wastewater treatment, chemical manufacturing, or industrial processes.
  • the fluid medium may be sampled to evaluate water quality associated with conventional oil and gas development.
  • the fluid medium may be sampled to evaluate water quality associated with unconventional oil and gas development.
  • the fluid medium may be sampled to evaluate water quality associated with coal mining.
  • the fluid medium may be sampled to evaluate water quality associated with landfill operations.
  • the fluid medium may be sampled to evaluate water quality associated with wastewater treatment.
  • the fluid medium may be sampled to evaluate water quality associated with chemical manufacturing.
  • the fluid medium may be sampled to evaluate water quality associated with industrial processes.
  • the water-immersible methane sensor may be configured to fit within a cylinder having a diameter in inches of about 1, 1.5. 2, 2.5, 3, 3.5, 4, 4.5, or 5, or any range between about any two of the preceding values, for example, between about 1 inch and about 4 inches.
  • the cylinder may have a diameter about any of the preceding values, for example, about two inches.
  • the cylinder may have a length in inches of about 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16, or any range between about any two of the preceding values, for example, between about 7 inches and about 12 inches.
  • the cylinder may have a diameter about any of the preceding values, for example, about 8 inches.
  • the cylinder may have a combination of any of the preceding values for the diameter and length, for example, a diameter of about 2 inches and a length of about eight inches.
  • the water-immersible methane sensor may include a lower methane detection limit in the fluid medium in mg/mL of at least about 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2., 1.3, 1.4, 1.5, or any range between about any two of the preceding values, for example, between about 0.01 mg/mL and about 0.1 mg/mL.
  • the immersible detection system may include a lower methane detection limit in the fluid medium of about any of the preceding values, for example, about 0.01 mg/ml; about 0.1 mg/mL; or about 1 mg/mL.
  • the water-immersible methane sensor may be configured to operate at a pressure in pounds per square inch absolute (psia) of about 0, 10, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, or any range between about any two of the preceding values, for example, between about between about 10 psia and 200 psia.
  • psia pounds per square inch absolute
  • the water-immersible methane sensor may be configured to operate at a temperature in ° C of about 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, or any range between about any two of the preceding values, for example, between about between about 0 ° C and about 50 ° C, or between about 5 ° C and about 30 ° C.
  • the water-immersible methane sensor may also include a heater configured to reduce condensation in the immersible detection system, for example, a resistive or thin film heater.
  • an immersible detection system for detecting the existence and concentration of methane included by a fluid medium.
  • the immersible detection system may include a chamber.
  • the immersible detection system may include a radiation source operatively connected with the chamber.
  • the radiation source may be tuned to emit radiation at a wavelength having a linewidth which embraces at least one significant absorption line of methane.
  • the immersible detection system may include a methane permeable, water impermeable membrane layer.
  • the methane permeable, water impermeable membrane layer may be operatively connected to the chamber.
  • the methane permeable, water impermeable membrane layer may be configured to admit at least a portion of the methane included by the fluid medium to the chamber.
  • the admitted methane may absorb at least a portion of the radiation at the at least one significant absorption line of methane.
  • the immersible detection system may include a detector configured to receive the radiation.
  • the immersible detection system may include a multi-pass mirror system including a concave mirror, e.g., a concave spherical mirror.
  • the multi-pass mirror system may be configured to direct the radiation emitted by the radiation source through the admitted methane in at least two passes.
  • the admitted methane may absorb at least a portion of the radiation at the at least one significant absorption line of methane.
  • the multi-pass mirror system may be configured to direct at least a portion of the radiation not absorbed by the admitted methane to the detector.
  • the immersible detection system may include a signal process and control unit operatively connected to the detector.
  • the signal process and control unit may be configured to analyze the radiation to determine the existence and concentration of the methane included by the fluid medium according to absorption at the at least one significant absorption line of methane.
  • a method for detecting the presence and concentration of methane included by a fluid medium may include separating at least a portion of the methane from the fluid medium.
  • the method may include directing radiation through the methane separated from the fluid medium in at least two passes.
  • the radiation may be at a wavelength having a linewidth which embraces at least one significant absorption line of a 2v3 band of methane.
  • the admitted methane may absorb at least a portion of the radiation in the at least one significant absorption line of the 2v3 band of methane.
  • the method may include selectively detecting absorption of the radiation at the at least one significant absorption line of the 2v3 band of methane.
  • the method may include determining the existence and concentration of the methane included by the fluid medium according to the selectively detected absorption of the radiation at the at least one significant absorption line of the 2v3 band of methane.
  • the fluid medium may include one or more of: a gaseous mixture of the methane in air or the methane dissolved in an aqueous solution.
  • the fluid medium may include a gaseous mixture of the methane in air.
  • the fluid medium may include the methane dissolved in an aqueous solution.
  • the fluid medium may include one or more of: a liquid, a gas, a vapor, a subcritical fluid, or a supercritical fluid.
  • the fluid medium may include a liquid.
  • the fluid medium may include a gas.
  • the fluid medium may include a vapor.
  • the fluid medium may include a subcritical fluid.
  • the fluid medium may include a supercritical fluid.
  • the method may include sampling or extracting the fluid medium to evaluate water quality.
  • the water quality may be associated with one or more of: conventional or unconventional oil and gas development, coal mining, landfill operations, wastewater treatment, chemical manufacturing, or industrial processes.
  • the water quality may be associated with conventional oil and gas development.
  • the water quality may be associated with unconventional oil and gas development.
  • the water quality may be associated with coal mining.
  • the water quality may be associated with landfill operations.
  • the water quality may be associated with wastewater treatment.
  • the water quality may be associated with chemical manufacturing.
  • the water quality may be associated with industrial processes.
  • the method may include detecting methane included by the fluid medium at a lower methane detection limit of at least about 0.01 mg/L.
  • the lower methane detection limit in the fluid medium in mg/mL may be at least about 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2., 1.3, 1.4, 1.5, or any range between about any two of the preceding values, for example, between about 0.01 mg/mL and about 0.1 mg/mL.
  • the method may include detecting methane included by the fluid medium at a lower methane detection limit of about any of the preceding values, for example, about 0.01 mg/ml; about 0.1 mg/mL; or about 1 mg/mL.
  • the method may include operating in a pressure range in pounds per square inch absolute (psia) of between about 10 psia and 200 psia.
  • the method may include operating at a pressure in pounds per square inch absolute (psia) of about 0, 10, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, or any range between about any two of the preceding values, for example, between about between about 10 psia and 200 psia.
  • the method may include operating in a temperature range of between about 0 ° C and 50 ° C.
  • the method may include operating at a temperature in ° C of about 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, or any range between about any two of the preceding values, for example, between about between about 0 ° C and about 50 ° C, or between about 5 ° C and about 30 ° C.
  • the directing radiation through the methane separated from the fluid medium in at least two passes may further include using a concave mirror, e.g., a concave spherical mirror.
  • the method may also include reducing condensation by heating one or more of a detector, a filter, a multi-pass mirror system, or a radiation source.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne des systèmes de détection immersibles (100) et des procédés pour les utiliser afin de détecter l'existence et la concentration de gaz méthane dans un milieu fluide. Le système comprend une source de rayonnement (110) émettant à une longueur d'onde d'absorption du méthane, une couche de membrane perméable au méthane (130) qui est, par exemple, imperméable à l'eau, un détecteur (120) ainsi qu'une unité de traitement et de contrôle de signal (150) connectée au détecteur pour analyser le rayonnement afin de déterminer la concentration du méthane dans le milieu fluide.
PCT/US2013/072920 2012-12-03 2013-12-03 Capteurs de méthane immersibles Ceased WO2014089115A1 (fr)

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US201261732822P 2012-12-03 2012-12-03
US61/732,822 2012-12-03

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WO2014089115A1 true WO2014089115A1 (fr) 2014-06-12

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107642684A (zh) * 2017-09-19 2018-01-30 常州常工电子科技股份有限公司 一种智能探漏装置
CN113605978A (zh) * 2021-08-23 2021-11-05 中煤科工集团重庆研究院有限公司 一种回风巷瓦斯排放监测方法
WO2022034152A1 (fr) * 2020-08-14 2022-02-17 Optronics Technology As Système de détection de gaz
WO2023139023A1 (fr) * 2022-01-19 2023-07-27 Argos Messtechnik Gmbh Dispositif pour l'analyse de gaz mesurés, en particulier de mesures en eaux profondes

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5341214A (en) * 1989-09-06 1994-08-23 Gaztech International Corporation NDIR gas analysis using spectral ratioing technique
US20020096492A1 (en) * 2000-01-28 2002-07-25 Thomas George Micromachined tuned-band hot bolometer emitter
US20050269499A1 (en) * 2003-05-23 2005-12-08 Schlumberger Technology Corporation Method and sensor for monitoring gas in a downhole environment
US20060093523A1 (en) * 2004-10-29 2006-05-04 Hyperteq, Lp System, method and apparatus for mud-gas extraction, detection and analysis thereof
JP2007192638A (ja) * 2006-01-18 2007-08-02 New Cosmos Electric Corp ガス検知装置
US20090044617A1 (en) * 2007-08-13 2009-02-19 Baker Hughes Incorporated Downhole gas detection in drilling muds
US20100050761A1 (en) * 2008-08-26 2010-03-04 SchlumbergerTechnology Corporation Detecting gas compounds for downhole fluid analysis

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5341214A (en) * 1989-09-06 1994-08-23 Gaztech International Corporation NDIR gas analysis using spectral ratioing technique
US20020096492A1 (en) * 2000-01-28 2002-07-25 Thomas George Micromachined tuned-band hot bolometer emitter
US20050269499A1 (en) * 2003-05-23 2005-12-08 Schlumberger Technology Corporation Method and sensor for monitoring gas in a downhole environment
US20060093523A1 (en) * 2004-10-29 2006-05-04 Hyperteq, Lp System, method and apparatus for mud-gas extraction, detection and analysis thereof
JP2007192638A (ja) * 2006-01-18 2007-08-02 New Cosmos Electric Corp ガス検知装置
US20090044617A1 (en) * 2007-08-13 2009-02-19 Baker Hughes Incorporated Downhole gas detection in drilling muds
US20100050761A1 (en) * 2008-08-26 2010-03-04 SchlumbergerTechnology Corporation Detecting gas compounds for downhole fluid analysis

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BOULART C ET AL: "Sensors and technologies for in situ dissolved methane measurements and their evaluation using Technology Readiness Levels", TRAC, TRENDS IN ANALYTICAL CHEMISTRY, ELSEVIER, AMSTERDAM, NL, vol. 29, no. 2, 1 February 2010 (2010-02-01), pages 186 - 195, XP026892534, ISSN: 0165-9936, [retrieved on 20100201], DOI: 10.1016/J.TRAC.2009.12.001 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107642684A (zh) * 2017-09-19 2018-01-30 常州常工电子科技股份有限公司 一种智能探漏装置
WO2022034152A1 (fr) * 2020-08-14 2022-02-17 Optronics Technology As Système de détection de gaz
CN113605978A (zh) * 2021-08-23 2021-11-05 中煤科工集团重庆研究院有限公司 一种回风巷瓦斯排放监测方法
WO2023139023A1 (fr) * 2022-01-19 2023-07-27 Argos Messtechnik Gmbh Dispositif pour l'analyse de gaz mesurés, en particulier de mesures en eaux profondes

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