CN105092527A - Gas detector for logging and method thereof - Google Patents
Gas detector for logging and method thereof Download PDFInfo
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- CN105092527A CN105092527A CN201410211161.5A CN201410211161A CN105092527A CN 105092527 A CN105092527 A CN 105092527A CN 201410211161 A CN201410211161 A CN 201410211161A CN 105092527 A CN105092527 A CN 105092527A
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Abstract
The invention relates to the field of oil-gas exploration and development, especially to a gas detector for logging and a method thereof. The gas detector comprises a laser emission module, a laser sensing module, a signal acquisition and processing module and a display module. By blending multiple functions of laser emission, laser control, second harmonic detection, wavelength modulation and data acquisition and processing, etc., the detector realizes ground real-time online detection of gas components and also can detect multi-component gases simultaneously according to actual situations of mine gases. In addition, the gas detector has advantages of simple operation, high detection accuracy, wide applicability and the like.
Description
Technical field
The present invention relates to oil-gas exploration and development field, particularly relate to a kind of well logging gas-detecting device and method.
Background technology
Well logging is exploratory development " eyes ".Gas detection technology is the gordian technique of well logging, and the object one that mud logging gas detects directly finds hydrocarbon zone, and two is the monitoring and warnings carrying out toxic and harmful, and three is find non-hydrocarbon gases mineral reserve.
In drilling process, bore the fluid of turning up the soil in layer and enter pit shaft in every way, return ground along with on drilling fluid.Under surface condition, these fluids present with gaseous state or liquid form.The detection of the detection of formation gas mainly hydro carbons gas (mainly saturated alkane class detects composition mainly component), by the detection to hydrocarbon gas, can find and evaluate oil, gas, water layer in time.
In exploitation well well logging process, making to be used as many is exactly gas chromatograph, and its principle of work is:
Utilize the partition factor of each component between gas phase with immobile liquid liquid phase in sample different, when vaporize after sample by carrier gas bring into run in chromatographic column time, component carries out repeated multiple times distribution with regard to two are wherein alternate, because Stationary liquid is to the absorption of each component or dissolving power difference, therefore each component travelling speed is in the chromatography column just different, after certain column length, just separated from one another, then leave chromatographic column in order and enter detecting device, the ion current signal produced, after amplifying, register is depicted the chromatographic peak of each component.
The gas phase analysis chromatograph of current application, detects the problems such as gas is single, complicated operation, selectivity are not high, accuracy of detection is low when there is measure gas concentrations.Also often in prior art in hydrocarbon indication adopt hydrogen flame color spectrum SK-3Q04, and the problem adopting hydrogen flame color to compose SK-3Q04 also to detect single hydrocarbon gas, and analyzing influence many factors, more easily to break down and component can not detect continuously in real time.
Summary of the invention
For above-mentioned technical matters existing in prior art, the invention provides a kind of well logging gas-detecting device, this device not only can detect the concentration change of gas in real time in well logging process, improves accuracy of detection, can also detect multiple gases simultaneously.The invention still further relates to the method using this gas-detecting device.
According to a first aspect of the invention, carry and encircleed a kind of well logging gas-detecting device, it comprises:
Laser emitting module, the laser needed during for providing and detecting gas;
Laser sensing module, for the laser making gas absorption laser emitting module to be measured send, and carries out opto-electronic conversion to convert electric signal to by the laser signal after gas absorption;
Signal acquiring and processing module, for receiving the electric signal of laser sensing CMOS macro cell, and carries out to the electric signal received the digital signal that process of fitting treatment is sign gas concentration;
Display module, for the digital signal of Received signal strength Acquire and process module, converts the concentration of gas to, and shows in real time by described digital signal.
Described laser emitting module comprises further:
At least one laser instrument, for Emission Lasers ripple;
At least one laser temperature control module, for regulating the temperature of laser instrument, prevents laser temperature because of too high or too low and damaged;
The laser diode current control module of at least one, for regulating the wavelength of laser, the centre wavelength of the laser that laser instrument is launched and the absorption line of gas to be measured match.
Laser instrument containing equal number in described laser emitting module, laser temperature control module and laser diode current control module.
As a modification of the present invention, this gas-detecting device also comprises:
Signal generating module and lock-in amplifier, this signal generating module one end and laser diode current control module are coupled, and produce sawtooth signal and are superimposed upon in laser drive current, make the Absorption Line of the inswept gas to be measured of optical maser wavelength, the other end of this signal generating module is coupled with lock-in amplifier
This lock-in amplifier for receiving the electric signal of laser sensing CMOS macro cell, and carries out second-harmonic detection, the sinewave modulation signal that reference signal when this lock-in amplifier carries out second-harmonic detection produces from described signal generating module.
Improve as another kind of the present invention, this gas-detecting device also comprises fiber coupler, and this fiber coupler one end is coupled with laser instrument, and the other end is coupled with laser sensing module, for being coupled by multiple laser, forms beam of laser ripple.
Described laser sensing module comprises:
Reflection tank, for making the laser exported from fiber coupler enter into reflection tank, for gas absorption to be measured, this reflection tank is also provided with air intake opening and exhausr port;
Detector, for receiving the laser signal that reflection tank exports, and is converted to electric signal through opto-electronic conversion by laser signal.
Described laser sensing module also comprises Demarcate Gas pond, and this one end, Demarcate Gas pond is coupled with reflection tank, and the other end is coupled with detector, for demarcating detection absorption signal.
As another improvement of the present invention, this gas-detecting device also comprises:
Gas purification module, carries out drying for the gas to be measured produced by Oil/gas Well and filters;
This gas purification module comprises the exsiccator and filtrator that connect according to this.
According to a further aspect of the invention, provide the method using well logging gas-detecting device mentioned above, comprise the following steps:
(1) laser wave matched with the absorbing wavelength of gas to be measured is launched by laser instrument; And by laser diode current control module, optical maser wavelength is regulated, centre wavelength and the gas absorption spectrum line center to be measured of the laser that laser instrument is launched match; Regulated by the temperature of laser temperature control module to laser instrument, prevent laser instrument because of too high or too low for temperature and damaged;
(2) in laser sensing module, laser is contacted with the gas to be measured entered by air intake opening, and the laser signal after gas absorption to be measured is transported to detector;
(3) laser signal received is carried out opto-electronic conversion by detector, and the electric signal after conversion is delivered to Signal acquiring and processing module,
(4) Signal acquiring and processing module converts the electric signal received to digital signal;
(5) digital signal is converted to concrete data to show on a display screen.
Described step (1) comprises further: the laser wave after coupling is delivered to laser sensing module after being coupled by laser wave by fiber coupler.
In described step (3), the laser signal received is converted to two path signal by detector,
One road electric signal is delivered to lock-in amplifier, and the sinewave modulation signal produced with signal generating module carries out second-harmonic detection, and the second harmonic signal of generation is delivered to Signal acquiring and processing module;
Another road electric signal is delivered to Signal acquiring and processing module and carries out data sampling and processing and control.
Described step (4) comprises further:
Signal from detector is carried out linear fit as laser intensity signal to its data after filtering;
The laser intensity signal of matching is utilized to be normalized to eliminate the impact of light-intensity variation on Concentration Testing the second harmonic signal that lock-in amplifier generates, second harmonic signal after normalization obtains a detection absorption spectra through repeatedly cumulative, carries out to the absorption spectra detected the concentration that the matching of secondary product obtains gas to be measured.
Described step (1) also comprises further:
The sawtooth signal that signal generating module produces is superimposed upon in laser drive current, makes the abundant absorbing laser ripple of gas.
Described step (2) comprises further:
Gas to be measured is carried out the step of drying, filtration by gas purification module.
Compared with prior art, the invention has the advantages that, by the several functions such as Laser emission, laser controlling, second-harmonic detection, wavelength-modulated, data acquisition and procession are merged, the ground real-time online realizing component gas detects, and can according to the actual conditions of mine gas, the gas of various ingredients is detected simultaneously simultaneously, and there is the advantages such as simple to operate, accuracy of detection is high, applicability is wide.
Accompanying drawing explanation
Fig. 1 shows gas-detecting device structural drawing according to the preferred embodiment of the invention;
Fig. 2 is the basic flow sheet of gas chromatography of the present invention.
The ingredient of gas chromatograph
(1) carrier gas system: comprise source of the gas, gas purification, gas flow rate control and measurement;
(2) sampling system: comprise injector, vaporizer (be steam by fluid sample instant vaporization);
(3) chromatographic column and Wen Zhu: comprise thermostatically-controlled equipment (being separated into by multicomponent sample single);
(4) detection system: comprise detecting device, temperature regulating device;
(5) register system: comprise amplifier, registering instrument or data processing equipment, workstation.
Embodiment
Below in conjunction with preferred embodiment and Figure of description, the present invention is described further.
Fig. 1 shows gas-detecting device according to the preferred embodiment of the invention, and it comprises: laser emitting module 1, laser sensing module 3, Signal acquiring and processing module 5 and display module 7.Laser emitting module 1 comprises the laser instrument 101, laser temperature control module 102 and the laser diode current control module 103 that are coupled according to this.Laser instrument 101, for launching the laser wave matched with gas absorption spectrum line to be measured; Laser temperature control module 102, for regulating the temperature of laser instrument 101, prevents laser instrument 101 temperature because of too high or too low and damaged; Laser diode current control module 103 is for regulating the wavelength of laser, and the centre wavelength of the laser that laser instrument 101 is launched and the absorption line of gas to be measured match.
When only needing to detect pure gas, laser emitting module 1 can only containing one group of laser instrument, 101, one group of laser temperature control module 102 and one group of laser diode current control module 103; When needs detect many group gas, can containing many group laser instruments 101, many group laser temperature control modules 102 and many group laser diode current control modules 103.The quantity of laser instrument 101, laser temperature control module 102 and laser diode current control module 103 should be all consistent with the group number of gas to be measured.Such as: when need detect 3 groups of gas, need in laser emitting module 1 to arrange 3 groups of laser instruments, 101,3 groups of laser temperature control modules 102 and 3 groups of laser diode current control modules 103 simultaneously.Each laser instrument 101 is coupled as the transmitting terminal of laser wave.
This gas-detecting device can also be provided with signal generating module 2 and lock-in amplifier 6.Signal generating module 2 one end and laser diode current control module 103 are coupled, producing sawtooth signal is superimposed upon on the drive current of laser instrument 101, the Absorption Line of the inswept gas to be measured of optical maser wavelength fully can be absorbed by gas to be measured, the other end of signal generating module 2 is coupled with lock-in amplifier 6, the electric signal that this lock-in amplifier 6 generates for receiving laser sensing module 3, and carry out second-harmonic detection, the sinewave modulation signal that reference signal when this lock-in amplifier 6 carries out second-harmonic detection produces from described signal generating module 2.
When detecting multicomponent gas, this gas-detecting device also comprises fiber coupler 8, this fiber coupler 8 one end is coupled with laser instrument 101, the other end is coupled with laser sensing module 3, when measuring many groups gas to be measured, multiple laser need be coupled, after forming beam of laser ripple, enter laser sensing module 3.
Laser sensing module 3 comprises: reflection tank 301 and detector 303, reflection tank 301 enters into reflection tank 301 (when detecting pure gas for making the laser exported from fiber coupler 8, the laser wave launched from laser instrument 101 directly enters reflection tank 301, absorb for gas contact to be measured), for the gas absorption to be measured after gas purification module 4 processes, this reflection tank 301 is also provided with air intake opening and exhausr port; Detector 303, for receiving the laser signal that reflection tank 301 exports, and is converted to electric signal through opto-electronic conversion by laser signal.This laser sensing module 3 can also comprise Demarcate Gas pond 302, and this one end, Demarcate Gas pond 302 is coupled with reflection tank 301, and the other end is coupled with detector 303, for demarcating detection absorption signal.
Gas detection method according to the preferred embodiment of the invention, it comprises the following steps:
Step one: launched the laser wave matched with the absorbing wavelength of gas to be measured by laser emitting module 1.
For making testing result error less, the optical maser wavelength to launching is needed to regulate, can be regulated by the laser diode current control module 103 pairs of optical maser wavelengths arranged, centre wavelength and the gas absorption spectrum line center to be measured of the laser that laser instrument 101 is launched match; Can also be regulated by the temperature of laser temperature control module 102 pairs of laser instruments 101, prevent laser instrument 101 because of too high or too low for temperature and damaged.
Step 2: in laser sensing module 3 laser with carry out drying by gas purification module 4, filter after and contact through the gas to be measured that air intake opening enters reflection tank 301, after the abundant absorbing laser ripple of gas to be measured, laser signal after absorbing is delivered to detector 303;
Step 3: the laser signal received is converted to two path signal by detector 303 after opto-electronic conversion;
One road electric signal is delivered to lock-in amplifier 6, and the sinewave modulation signal produced with signal generating module 2 carries out second-harmonic detection, and the second harmonic signal of generation is delivered to Signal acquiring and processing module 5;
Another road electric signal is directly delivered to Signal acquiring and processing module 5 and carries out data sampling and processing and control.
Step 4: the signal from detector 303 is carried out linear fit as laser intensity signal to its data by Signal acquiring and processing module 5 after filtering; Utilized by the second harmonic signal that lock-in amplifier 6 generates the laser intensity signal of matching to be normalized to eliminate the impact of light-intensity variation on Concentration Testing simultaneously, second harmonic signal after normalization obtains a detection absorption spectra through repeatedly cumulative, carries out to the absorption spectra detected the concentration that the matching of secondary product obtains gas to be measured.
Step 5: digital signal is converted to concrete data and show on a display screen.The corresponding concentration of gas to be measured can be obtained.
In step, in order to make gas to be measured energy fully absorbing laser ripple, can also by conditioning signal generation module 2 output sawtooth signal, and the sawtooth signal of generation is superimposed upon on laser instrument 101 drive current, thus when making the inswept gas to be measured of optical maser wavelength, gas to be measured can abundant absorbing laser ripple.
When measuring multicomponent gas, after the laser wave that many group laser instruments 101 are launched arrives fiber coupler 8, multiple laser ripple is coupled by fiber coupler 8, and is delivered to reflection tank 301.When detecting one-component gas, laser instrument 101 laser wave is directly delivered to reflection tank 301.
This gas-detecting device and method are by merging several functions such as second-harmonic detection, wavelength-modulated, data acquisition and procession, the ground real-time online realizing component gas detects, and can detect according to the gas of the actual conditions of mine gas to various ingredients, and there is the advantages such as simple to operate, accuracy of detection is high, applicability is wide simultaneously.
Although present invention is described with reference to preferred embodiment, without departing from the scope of the invention, various improvement can be carried out to it and material wherein can be replaced with equivalent.The present invention is not limited to specific embodiment disclosed in literary composition, but comprises all technical schemes fallen in the scope of claim.
Claims (13)
1. a well logging gas-detecting device, is characterized in that, comprising:
Laser emitting module, the laser needed during for providing and detecting gas;
Laser sensing module, for the laser making gas absorption laser emitting module to be measured send, and carries out opto-electronic conversion to convert electric signal to by the laser signal after gas absorption;
Signal acquiring and processing module, for receiving the electric signal of laser sensing CMOS macro cell, and carries out to the electric signal received the digital signal that process of fitting treatment is sign gas concentration;
Display module, for the digital signal of Received signal strength Acquire and process module, converts the concentration of gas to, and shows in real time by described digital signal.
Described laser emitting module comprises further:
At least one laser instrument, for Emission Lasers ripple;
At least one laser temperature control module, for regulating the temperature of laser instrument, prevents laser temperature because of too high or too low and damaged;
The laser diode current control module of at least one, for regulating the wavelength of laser, the centre wavelength of the laser that laser instrument is launched and the absorption line of gas to be measured match.
2. well logging gas-detecting device as claimed in claim 1, is characterized in that, the laser instrument containing equal number in described laser emitting module, laser temperature control module and laser diode current control module.
3. well logging gas-detecting device as claimed in claim 1 or 2, it is characterized in that, this gas-detecting device also comprises: signal generating module and lock-in amplifier, this signal generating module one end and laser diode current control module are coupled, producing sawtooth signal is superimposed upon in laser drive current, make the Absorption Line of the inswept gas to be measured of optical maser wavelength, the other end of this signal generating module is coupled with lock-in amplifier
This lock-in amplifier for receiving the electric signal of laser sensing CMOS macro cell, and carries out second-harmonic detection, the sinewave modulation signal that reference signal when this lock-in amplifier carries out second-harmonic detection produces from described signal generating module.
4. well logging gas-detecting device as claimed in claim 1, it is characterized in that, this gas-detecting device also comprises fiber coupler, this fiber coupler one end is coupled with laser instrument, the other end is coupled with laser sensing module, for being coupled by multiple laser, forms beam of laser ripple.
5. well logging gas-detecting device as claimed in claim 4, it is characterized in that, described laser sensing module comprises:
Reflection tank, for making the laser exported from fiber coupler enter into reflection tank, for gas absorption to be measured, this reflection tank is also provided with air intake opening and exhausr port;
Detector, for receiving the laser signal that reflection tank exports, and is converted to electric signal through opto-electronic conversion by laser signal.
6. well logging gas-detecting device as claimed in claim 5, it is characterized in that, described laser sensing module also comprises Demarcate Gas pond, and this one end, Demarcate Gas pond is coupled with reflection tank, and the other end is coupled with detector, for demarcating detection absorption signal.
7. well logging gas-detecting device as claimed in claim 6, it is characterized in that, this gas-detecting device also comprises:
Gas purification module, carries out drying for the gas to be measured produced by Oil/gas Well and filters;
This gas purification module comprises the exsiccator and filtrator that connect according to this.
8. a well logging gas detection method, it comprises the following steps:
(1) laser wave matched with the absorbing wavelength of gas to be measured is launched by laser instrument; And by laser diode current control module, optical maser wavelength is regulated, centre wavelength and the gas absorption spectrum line center to be measured of the laser that laser instrument is launched match; Regulated by the temperature of laser temperature control module to laser instrument, prevent laser instrument because of too high or too low for temperature and damaged;
(2) in laser sensing module, laser is contacted with the gas to be measured entered by air intake opening, and the laser signal after gas absorption to be measured is transported to detector;
(3) laser signal received is carried out opto-electronic conversion by detector, and the electric signal after conversion is delivered to Signal acquiring and processing module,
(4) Signal acquiring and processing module converts the electric signal received to digital signal;
(5) digital signal is converted to concrete data to show on a display screen.
9. gas detection method as claimed in claim 8, it is characterized in that, described step (1) comprises further: the laser wave after coupling is delivered to laser sensing module after being coupled by laser wave by fiber coupler.
10. the gas detection method as described in any one of claim 8-9, is characterized in that, in described step (3), the laser signal received is converted to two path signal by detector,
One road electric signal is delivered to lock-in amplifier, and the sinewave modulation signal produced with signal generating module carries out second-harmonic detection, and the second harmonic signal of generation is delivered to Signal acquiring and processing module;
Another road electric signal is delivered to Signal acquiring and processing module and carries out data sampling and processing and control.
11. gas detection methods as claimed in claim 10, is characterized in that, described step (4) comprises further:
Signal from detector is carried out linear fit as laser intensity signal to its data after filtering;
The laser intensity signal of matching is utilized to be normalized to eliminate the impact of light-intensity variation on Concentration Testing the second harmonic signal that lock-in amplifier generates, second harmonic signal after normalization obtains a detection absorption spectra through repeatedly cumulative, carries out to the absorption spectra detected the concentration that the matching of secondary product obtains gas to be measured.
12. gas detection methods as claimed in claim 10, is characterized in that, described step (1) also comprises further: be superimposed upon in laser drive current by the sawtooth signal that signal generating module produces, make the abundant absorbing laser ripple of gas.
13. gas detection methods as claimed in claim 8, is characterized in that, described step (2) comprises further:
Gas to be measured is carried out the step of drying, filtration by gas purification module.
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| CN201410211161.5A CN105092527A (en) | 2014-05-19 | 2014-05-19 | Gas detector for logging and method thereof |
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Cited By (3)
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| CN105758969A (en) * | 2016-05-05 | 2016-07-13 | 煤科集团沈阳研究院有限公司 | Gas chromatograph used under mine and use method |
| CN108519349A (en) * | 2018-03-30 | 2018-09-11 | 东北石油大学 | Oil field gas injection multielement hot fluid component CO2And H2O concentration on-line checking experimental provisions |
| CN113466207A (en) * | 2021-06-30 | 2021-10-01 | 天津大学 | Gasification tar monitoring system, monitoring method and device |
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| CN113466207A (en) * | 2021-06-30 | 2021-10-01 | 天津大学 | Gasification tar monitoring system, monitoring method and device |
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