CN102944546A - Drilling fluid analysis device and method - Google Patents
Drilling fluid analysis device and method Download PDFInfo
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- CN102944546A CN102944546A CN201210520562XA CN201210520562A CN102944546A CN 102944546 A CN102944546 A CN 102944546A CN 201210520562X A CN201210520562X A CN 201210520562XA CN 201210520562 A CN201210520562 A CN 201210520562A CN 102944546 A CN102944546 A CN 102944546A
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Abstract
The invention discloses a drilling fluid analysis device and method. The drilling fluid analysis device comprises a computer, a sensor, a direct current power supply and a signal processing circuit, wherein the direct current power supply is connected with the sensor and supplies working power to the sensor; and the signal processing circuit is connected with the sensor and the computer respectively. The drilling fluid analysis method comprises the following steps of: arranging the sensor in a drilling fluid tank; emitting Raman excitation light by the sensor to a tested sample; receiving the Raman excitation light sent by the tested sample; converting a light signal of the Raman excitation light into an analog electric signal, sending the analog electric signal to the signal processing circuit, performing digital-to-analog conversion to obtain a Raman digital signal; then sending the Raman digital signal to the computer for analysis calculation through the signal processing circuit; and calculating the concentration of hydrocarbon substances in the tested sample by using a relational expression of the Raman scattered light and the concentration of the tested sample. By the drilling fluid analysis device and the drilling fluid analysis method, drilling fluid can be directly and quantitatively analyzed in real time; the detection speed is high; the analysis accuracy is high; and the device is simple in structure, stable in performance and relatively low in cost.
Description
Technical field
The present invention relates to a kind of drilling fluid analytical equipment, relate in particular to a kind of drilling fluid analytical equipment and analytical approach thereof based on Raman spectrum analysis.
Background technology
In photon and the molecular collision process, except by the molecule absorption, also scattering can occur.Because the collision mode is different, has multiple scattering form (elastic collision and inelastic collision) between photon and the molecule.If when collision energy exchange has occured between photon and the molecule, this not only makes photon change its direction of motion, has also changed its energy, and this being scattered in is called as Raman scattering on the spectrum, and intensity approximately is 10 of incident ray
-7This is that India physicist Raman is found when the light scattering of nineteen twenty-eight research benzene, and has therefore obtained the nineteen thirty Nobel Prize in physics.
Because what Raman scattering was related mainly is vibrational energy level and the rotational energy level of molecule, so it has identical object range with infrared spectrum.And different be that from microcosmic angle, infrared spectrum derives from the natural dipole moment of molecule, is that the asymmetric vibration by molecule causes; And scattering spectrum derives from the induced dipole moment of molecule, is to be caused by the symmetric vibration with symmetrical key.The two has complementarity.Peak that it should be noted that Raman spectrum will sharply can divide than infrared spectrum, and Raman spectrum is not subjected to the impact of water.In addition, homonuclear diatomic molecule (hydrogen, nitrogen etc.) is because its dipole moment is zero, thus there is not infrared spectrum, but its stretching vibration meeting produces Raman spectrum.Therefore, Raman spectrum can be used for detecting the nearly all material except rare gas.
As shown in Figure 1, wherein horizontal ordinate is Raman shift, ordinate is the Raman scattering light intensity, from accompanying drawing 1, can find out, hydrocarbons such as methane, propane, normal hexane, normal octane etc. are owing to have similar architectural feature, have close Raman shift at Raman spectrum, and their Raman scattering light intensity and its concentration are proportional.
In the oil-gas exploration process, on return hydrocarbons entrained in the drilling fluid qualitative and quantitative analysis be the gordian technique of well logging, its objective is direct discovery hydrocarbon zone.At present, mainly be by gas detection technology to the discriminating of oil gas in the drilling fluid, after the degassed separation of the oleaginous material in the stratum that drilling fluid is entrained (lower paraffin hydrocarbon is main), utilize the fast gas chromatograph analysis technology that it is detected.The major defect that gas chromatographic analysis exists is: (1) drilling fluid sample to be detected need pass through degassed separating treatment, and operation steps is complicated, and needs to use a series of supplement production equipment such as air compressor, hydrogen generator, and cost is higher; (2) air-channel system of degassed separating treatment equipment and gas chromatographic analysis equipment is complicated, and detection speed is slower, and rate of breakdown is high; (3) drilling fluid is being carried out in the process of degassed separating treatment, the temperature non-constant and gas sample transfer line of degassing efficiency all has direct impact to testing result, affects the gas chromatographic analysis Stability and dependability.
Summary of the invention
The invention provides a kind of drilling fluid analytical equipment and analytical approach thereof, can directly carry out real-time quantitative analysis to drilling fluid, detection speed is fast, and is with high accuracy, and apparatus structure is simple, stable performance, lower cost.
The present invention realizes by the following technical solutions: a kind of drilling fluid analytical equipment, and this described device comprises computing machine, is characterized in, and described drilling fluid analytical equipment also comprises: sensor, direct supply, signal processing circuit; Described direct supply and sensor are connected to it working power are provided; Described signal processing circuit is connected with sensor, computing machine respectively; Described sensor output analog electrical signal also sends to signal processing circuit, signal processing circuit is carried out analog to digital conversion with analog electrical signal to be made it to become the Raman digital signal and sends to computing machine, computing machine is processed the Raman digital signal that receives, and by signal processing circuit and sensor transmitted in both directions control signal and data.
Above-mentioned a kind of drilling fluid analytical equipment is characterized in, described sensor comprises housing and the sapphire window that is arranged on the housing, also comprises excitation source, avalanche diode detection module, right-angle prism, dichroic filter in the housing; Described avalanche diode detection module and excitation source interval arranged side by side arranges; The corresponding interval with the avalanche diode detection module of described right-angle prism arranges; Described dichroic filter interval is tilting between right-angle prism and sapphire window, and corresponding with excitation source; Described excitation source, right-angle prism and dichroic filter, avalanche diode detection module form the light path in the sensor.
Above-mentioned a kind of drilling fluid analytical equipment is characterized in that the shape of cross section of described sapphire window is made as plane or cambered surface.
Above-mentioned a kind of drilling fluid analytical equipment is characterized in that described excitation source is the pulse excitation light source; The frequency of operation of described avalanche diode detection module and the pulsed frequency of excitation source are complementary.Above-mentioned a kind of drilling fluid analytical equipment, be characterized in, also comprise a radiator valve in the described housing, described radiator valve is arranged on the periphery of excitation source and avalanche diode detection module, and this radiator valve carries out thermostatic control to excitation source and the avalanche diode detection module of its inside.Above-mentioned a kind of drilling fluid analytical equipment is characterized in, also comprises one group of Raman optical filter in the housing of described sensor, and described one group of Raman optical filter is arranged between right-angle prism and the avalanche diode detection module; Described one group of Raman optical filter comprises at least a slice narrow band pass filter.Above-mentioned a kind of drilling fluid analytical equipment is characterized in, also comprises many group optical fiber in the housing of described sensor, and each described optical fiber connects excitation source, dichroic filter, right-angle prism, Raman optical filter, avalanche diode detection module successively.
Above-mentioned a kind of drilling fluid analytical equipment is characterized in, also comprises one or more groups lens in the housing of described sensor, and each described lens is arranged in the light path of sensor, regulates and optimize the light path of raman excitation light and Raman diffused light propagation.
A kind of drilling fluid analytical approach is used for above-mentioned a kind of drilling fluid analytical equipment, is characterized in that described analytical approach comprises following steps:
Step 2, computing machine by signal processing circuit to the sensor settings parameter;
The sample emission raman excitation light of the setup parameter that step 3, sensor receive according to step 2 in the drilling fluid canal, and receive the sample Raman diffused light that scattering returns that is excited is converted to analog electrical signal with the light signal of Raman diffused light;
Step 4, sensor outputs to signal processing circuit with analog electrical signal, signal processing circuit is carried out analog to digital conversion to analog electrical signal, makes it to change into the Raman digital signal, and with this Raman digital signal to computer export.
Above-mentioned a kind of drilling fluid analytical approach is characterized in that described step 3 also comprises:
Step 3.1, the excitation source of sensor is outwards launched raman excitation light according to the setup parameter that step 2 receives,
Step 3.2, because dichroic filter has the characteristic of the light of optionally reflection or a certain frequency range of transmission, the raman excitation light that is transmitted on the dichroic filter is reflected, and the raman excitation light of reflection propagates on the sample in the drilling fluid canal by sapphire window;
Step 3.3, sample is by the backward outer scattering Raman diffused light of Raman excitation optical excitation;
Step 3.4, the Raman diffused light that sample scatters propagates on the dichroic filter by sapphire window, because dichroic filter has the characteristic of the light of optionally reflection or a certain frequency range of transmission, dichroic filter is crossed in the Raman diffused light transmission, and propagates to right-angle prism;
Step 3.5, the Raman diffused light of propagating to right-angle prism is transmitted in the right-angle prism perpendicular to a right angle face of right-angle prism, and the inclined-plane that propagates into right-angle prism is inboard, Raman diffused light changes the direction of propagation after through the reflection on inclined-plane to be propagated to another right angle face of right-angle prism, and is transmitted to outside the right-angle prism at this right angle face;
Step 3.6, the Raman diffused light that changes the direction of propagation through right-angle prism propagates on the avalanche diode detection module, and the avalanche diode detection module is converted to analog electrical signal with the light signal of the Raman diffused light that receives.
Compared with prior art, the present invention has following beneficial effect:
A kind of drilling fluid analytical equipment of the present invention is owing to comprise sensor, direct supply, signal processing circuit, computing machine, and device structure is simple, and is with low cost, and is convenient to maintenance and maintenance in the routine work; Apparatus of the present invention have been saved a series of supplement production equipment such as degassed separating treatment owing to being provided with sensor and sensor setting directly being measured drilling fluid in drilling fluid canal, rate of breakdown is lower, stable performance; The present invention is owing to be provided with sensor, and in sensor, be provided with the avalanche diode detection module of excitation source and reception and conversion Raman scattering light signal, utilize hydrocarbons at Raman spectrum similar Raman shift to be arranged, and the characteristic that the Raman scattering light intensity is directly proportional with sample concentration, realization is measured the real-time quantitative of hydrocarbons concentration in the drilling fluid, analysis speed is fast, accuracy is high, can satisfy petroleum prospecting and coal-seam gas, the petroleum exploration domains such as non-conventional gas exploitation such as shale gas, and geologic media monitoring, the laboratory, the needs in the fields such as chemical real-time analysis.
Description of drawings
Fig. 1 is the feature Raman spectrogram of prior art methane, propane, normal hexane, normal octane;
Fig. 2 is the structural representation of a kind of drilling fluid analytical equipment of the present invention;
Fig. 3 is the structural representation of the sensor of a kind of drilling fluid analytical equipment of the present invention;
Fig. 4 is the schematic flow sheet of a kind of drilling fluid analytical approach of the present invention;
Fig. 5 is the schematic flow sheet of the step 3 of a kind of drilling fluid analytical approach of the present invention;
Fig. 6 is the Raman scattering light intensity of the normal hexane standard sample among a kind of drilling fluid analytical approach of the present invention embodiment and the graph of a relation of sample concentration.
Embodiment
Below in conjunction with accompanying drawing, by describing a better specific embodiment in detail, the present invention is further elaborated.
Consult shown in the accompanying drawing 2, a kind of drilling fluid analytical equipment of the present invention comprises: sensor 1, direct supply 2, signal processing circuit 3, computing machine 4.Direct supply 2 is connected to it with sensor 1 working power is provided; Signal processing circuit 3 is connected with sensor 1, computing machine 4 respectively; Sensor 1 output analog electrical signal also sends to signal processing circuit 3, signal processing circuit 3 is carried out analog to digital conversion with analog electrical signal to be made it to become the Raman digital signal and sends to computing machine 4, the Raman digital signal that 4 pairs in computing machine receives is processed, and by signal processing circuit 3 and sensor 1 transmitted in both directions control signal and data.
Comprise excitation source 12, avalanche diode (APD) detection module 13, right-angle prism 14, dichroic filter 15 in the housing 10.Avalanche diode detection module 13 arranges with excitation source 12 intervals arranged side by side; Right-angle prism 14 arranges with avalanche diode detection module 13 corresponding intervals; Dichroic filter 15 intervals are tilting between right-angle prism 14 and sapphire window 11, and corresponding with excitation source 12.The light path that excitation source 12, right-angle prism 14 and dichroic filter 15, avalanche diode detection module 13 form in the sensors 1.The raman excitation light that excitation source 12 sends is through dichroic filter 15 and by being radiated at after the sapphire window 11 on the sample 17, sample 17 is excited the Raman diffused light that scatters by being received by avalanche diode detection module 13 through dichroic filter 15 and right-angle prism 14 after the sapphire window 11, and is converted to analog electrical signal.
Excitation source 12 is for the invention provides raman excitation light.Excitation source 12 is the pulse excitation light source, and its pulsed frequency scope is 1kHz ~ 10MHz.Owing to usually in drilling fluid, there is the material that has in a large number fluorescence, the large several orders of magnitude of strength ratio Raman scattering light intensity of fluorescence, the accuracy in detection of meeting severe jamming sensor 1, principle according to photoluminescence, the generation of fluorescence has about a few microsecond to arrive several milliseconds delay, and Raman scattering is to produce moment, therefore utilize the instantaneity of Raman scattering and the hysteresis quality of fluorescence, select the long pulse excitation light source of wavelength as excitation source 12, can avoid hyperfluorescenceCeng Yongminggaoyingguang material in the drilling fluid to the interference of the faint Raman diffused light of sample scattering.The excitation source 12 preferred pulsed laser light sources that use visible light or near-infrared band can also be selected other various pulse excitation light sources.The pulse excitation light source of visible light-near-infrared band has two advantages: the one, and the laser technique comparative maturity of this wave band has very high cost performance; The 2nd, select visible light or near infrared light can reduce fluorescence to the interference of Raman scattering.In the present embodiment, select wavelength be the red visible light pulses laser instrument of 660nm as excitation source 12, power is not less than 100mW.
Avalanche diode detection module 13 is converted to analog electrical signal with the light signal that receives, and it utilizes avalanche effect can amplify fast and detect faint Raman scattering light signal.The operating frequency range of avalanche diode detection module 13 is 1kHz ~ 10MHz, and the pulsed frequency of its frequency of operation and excitation source 12 is complementary.Avalanche diode detection module 13 has very high frequency of operation, utilize the characteristics of the hysteresis quality of the instantaneity of Raman scattering and fluorescence, before fluorescence produces, Raman diffused light is detected, can avoid fluorescent material in the drilling fluid to the interference of the detection of Raman diffused light, improve the signal to noise ratio (S/N ratio) of light signal.In the present embodiment, avalanche diode detection module 13 is selected the APD detection module C5331 of shore pine.
Housing 10 is interior can also to arrange a radiator valve 18, radiator valve (18) is arranged on the periphery of excitation source (12) and avalanche diode detection module (13), is opposite to its inner excitation source 12 and avalanche diode detection module 13 carries out thermostatic control.The luminous power of excitation source 12 is relevant with its working temperature with glow frequency, experiment showed, in the present embodiment, and 5 ℃ of the every variations of temperature, the Raman excitation light wavelength that excitation source 12 sends can change 1nm, and its optical output power can change about 5mW.Therefore for the consistance of the stable of the luminous power that guarantees excitation source 12 and the Raman excitation optical wavelength sent, must carry out thermostatic control to excitation source 12.Simultaneously, in order to improve drilling fluid is detected the accuracy of analyzing, select in the present embodiment high sensitivity avalanche diode detection module 13 at a high speed, it is carried out thermostatic control, can make sensor 1 reliable and stable work in a wider ambient temperature range.In the present embodiment, usage ratio-integral-derivative controller (Proportion Integration Differentiation, the PID controller), its temperature-controlled precision can reach 0.2 ℃, the error of the Raman excitation optical wavelength that makes the luminous power of the excitation source 12 that is caused by temperature and send has improved the job stability of sensor 1 and the environmental suitability of drilling fluid analytical equipment of the present invention all less than per mille.
The raman excitation light that excitation source 12 sends is through dichroic filter 15 and by being radiated at after the sapphire window 11 on the sample 17, and the Raman diffused light that sample 17 is inspired is by being received by avalanche diode detection module 13 through dichroic filter 15 and right-angle prism 14 after the sapphire window 11.Dichroic filter 15 has the characteristic of the light of optionally reflection or a certain frequency range of transmission.Select suitable dichroic filter 16 according to user demand, can optimize structure and the inner light path of sensor 1.In the present embodiment, dichroic filter 16 can reflect raman excitation light, and the transmission Raman diffused light.Right-angle prism 14 arranges with avalanche diode detection module 13 corresponding intervals; Can also use by a plurality of right-angle prisms interval the prism group that forms is set, arrange with avalanche diode detection module 13 corresponding intervals, to optimize light path.In the present embodiment, select one with the right-angle prism 14 of optical anti-reflective film, so that maximize by the Raman diffused light of right angle lens 14.
The housing 11 of sensor 1 is interior can also to arrange one group of Raman optical filter 16, and this group of Raman optical filter 16 is arranged between right-angle prism 14 and the avalanche diode detection module 13, comprises at least a slice narrow band pass filter.This narrow band pass filter must have very high optical density (Optical Density, OD), its optical density value is greater than 4, when guaranteeing the Raman scattering light transmission rate, the light that reduces as far as possible other wave band passes through, thereby reduce elastic scattering (Ruili line) to the interference of Raman diffused light, improve the signal to noise ratio (S/N ratio) of the light signal that is sent to avalanche diode detection module 13.In the present embodiment, according to the red visible light pulses laser instrument of selecting and the feature Raman shift of the hydrocarbon key chattering of alkane, selected two optical density value to form one group of Raman optical filter 16 greater than 4 narrow band pass filter for the Raman scattering optical band of hydrocarbons.
Housing 10 interior can also the settings of sensor 1 are organized optical fiber (not marking in the accompanying drawing) more, and each optical fiber connects excitation source 12, dichroic filter 15, right-angle prism 14, Raman optical filter 16, avalanche diode detection module 13 successively.Wherein one group of optical fiber sends the moral raman excitation light with excitation source 12 and transfers to dichroic filter 15; Wherein another group optical fiber receives the Raman diffused light through right-angle prism 14 reflections, and transfers to avalanche diode detection module 13.Can make up long distance, flexible light path at the sensor 1 interior optical fiber that arranges.
The housing 10 of sensor 1 is interior can also to arrange one or more groups lens (not marking in the accompanying drawing), each is organized in the light path that lens are arranged on the sensor 1 that excitation source 12, dichroic filter 15, right-angle prism 14, Raman optical filter 16, avalanche diode detection module 13 form, in order to regulate and to optimize the light path of raman excitation light and Raman diffused light, improve the detection quality of Raman scattering light signal.
Direct supply 2 is connected to it with sensor 1 working power is provided, direct supply 2 be arranged on computing machine 4 near, with the potential safety hazard of avoiding execute-in-place to bring.In the present embodiment, this direct supply 2 uses the direct supply of 24V.
Signal processing circuit 3 is connected with sensor 1, computing machine 4 respectively, respectively to sensor 1 and computing machine 4 transmitted signals, and receives the signal that comes from sensor 1 and computing machine 4.Signal processing circuit 3 be arranged on computing machine 4 near, it can be connected with sensor 1 by wired or wireless multiple communication modes, and can arrange according to various actual conditions such as field working conditions; This signal processing circuit 3 can be used the wired connection mode and access computing machine 4 by many general interfaces such as 232 serial ports or USB interface, process thereby the signal of sensor 1 is sent to computing machine 4, the parameter information that perhaps computing machine 4 is sent sends to sensor 1 and arranges and adjust.Signal processing circuit 3 is the circuit module of prior art.
Computing machine 4 is the computing machine of prior art, inner the Raman digital signal that special-purpose software and database send signal processing circuit 3 can be set carry out analytical calculation, and send a signal to excitation source frequency, the light intensity that sensor 1 is adjusted sensor 1, the parameters such as control temperature by signal processing circuit 3.
Consult shown in the accompanying drawing 4, a kind of drilling fluid analytical approach, be used for above-mentioned a kind of drilling fluid analytical equipment, comprise following steps: step 1, the sensor 1 of a kind of drilling fluid analytical equipment of the present invention is arranged in the drilling fluid canal 5, this drilling fluid analytical equipment is connected with external power source and opens corresponding power switch, direct supply 2 provides working power to sensor 1;
Step 2, computing machine 4 is set excitation source frequency, light intensity, the parameters such as control temperature by 3 pairs of sensors of signal processing circuit 1.
The sample 17 emission raman excitation lights of the parameter that step 3, sensor 1 receive according to step 2 in the drilling fluid canal 5, and receive sample 17 Raman diffused light that scattering returns that is excited are converted to analog electrical signal with the light signal of Raman diffused light;
Consult shown in the accompanying drawing 5, step 3 also comprises:
Step 3.1, the excitation source 12 of sensor 1 is outwards launched raman excitation light according to the setup parameter that step 2 receives,
Step 3.2, because dichroic filter 15 has the characteristic of the light of optionally reflection or a certain frequency range of transmission, the raman excitation light that is transmitted on the dichroic filter 15 is reflected, and the raman excitation light of reflection shines on the sample 17 in the drilling fluid canal 5 by sapphire window 11;
Step 3.3, sample 17 is by the backward outer scattering Raman diffused light of Raman excitation optical excitation;
Step 3.4, the Raman diffused light that sample 17 scatters propagates on the dichroic filter 15 by sapphire window 11, because dichroic filter 15 has the characteristic of the light of optionally reflection or a certain frequency range of transmission, dichroic filter 15 is crossed in the Raman diffused light transmission, and propagates to right-angle prism 14;
Step 3.5, the Raman diffused light of propagating to right-angle prism 14 is transmitted in the right-angle prism perpendicular to a right angle face of right-angle prism 14, and the inclined-plane that propagates into right-angle prism 14 is inboard, Raman diffused light changes the direction of propagation after through the reflection on inclined-plane to be propagated to another right angle face of right-angle prism 14, and is transmitted to outside the right-angle prism 14 at this right angle face;
Step 3.6, the Raman diffused light that changes the directions of propagation through right-angle prism 14 shine on the avalanche diode detection module 13 after through Raman optical filter 16, and avalanche diode detection module 13 is converted to analog electrical signal with the light signal of the Raman diffused light that receives.Step 4, sensor 1 outputs to signal processing circuit 3 with analog electrical signal, and 3 pairs of analog electrical signals of signal processing circuit carry out analog to digital conversion, make it to change into the Raman digital signal, and this Raman digital signal is exported to computing machine 4.Step 5, utilize the intensity of Raman diffused light (Stockes line) and the relational expression of sample concentration:
P=kcVΩP
0 （1），
Wherein, P is the Raman scattering light intensity; K is the Raman scattering factor of sample; C is the concentration of sample; V is the volume of raman excitation light and sample generation Raman scattering; Ω is the solid angle that receives Raman diffused light; P
0It is the luminous power of raman excitation light.For a certain Raman sensor, the luminous power P of raman excitation light
0, Raman scattering factor k, the sample solid angle Ω that produces the volume V of Raman scattering and receive Raman scattering is fixed value, so the concentration c of the Raman scattering light intensity P that receives and sample is proportional.
Because the feature Raman spectrum of the hydrocarbon key C-H vibration of various hydrocarbons has similar Raman shift, therefore can use a certain hydrocarbons as standard sample various hydrocarbons to be measured, thereby realize the quantitative measurment to the hydrocarbons concentration in the drilling fluid.Take a certain hydrocarbons as standard sample, 4 pairs of these hydrocarbons standard sample building databases of computing machine comprise the concentration of standard sample and the data of Raman scattering light intensity in the database.In the present embodiment, with the standard sample of normal hexane as the hydrocarbons in the drilling fluid, accompanying drawing 6 is depicted as the testing result to the sample that contains the variable concentrations normal hexane, horizontal ordinate is the normal hexane concentration in the sample, ordinate is the Raman scattering light intensity, as can be seen from Figure 4, the normal hexane concentration in Raman scattering light intensity and the sample has good linear dependence relation, its linearly dependent coefficient R=0.9931.Computing machine 4 compares analysis with the size of the Raman digital signal that receives and the Raman scattering light intensity data of database Plays sample, calculates the hydrocarbons concentration in the drilling fluid sample.Because the present invention is arranged in the drilling fluid canal 5 and directly the drilling fluid sample is measured, and analysis speed is fast, therefore can realize the real-time quantitative of the hydrocarbons concentration in the drilling fluid is measured.
In sum, apparatus of the present invention are simple in structure, and are with low cost, are convenient to maintenance and maintenance in the routine work; And owing to being provided with sensor and sensor setting directly being measured drilling fluid in drilling fluid canal, saved a series of supplement production equipment such as degassed separating treatment, rate of breakdown is lower, stable performance; The present invention is owing to be provided with sensor, and in sensor, be provided with the avalanche diode detection module of excitation source and reception and conversion Raman scattering light signal, utilize hydrocarbons at Raman spectrum similar Raman shift to be arranged, and the characteristic that the Raman scattering light intensity is directly proportional with sample concentration, realization is measured the real-time quantitative of hydrocarbons concentration in the drilling fluid, analysis speed is fast, accuracy is high, can satisfy petroleum prospecting and coal-seam gas, the petroleum exploration domains such as non-conventional gas exploitation such as shale gas, and geologic media monitoring, the laboratory, the needs in the fields such as chemical real-time analysis.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. drilling fluid analytical equipment, this described device comprises computing machine (4), it is characterized in that, and described drilling fluid analytical equipment also comprises: sensor (1), direct supply (2), signal processing circuit (3);
Described direct supply (2) is connected to it with sensor (1) working power is provided; Described signal processing circuit (3) is connected with sensor (1), computing machine (4) respectively; Described sensor (1) output analog electrical signal also sends to signal processing circuit (3), signal processing circuit (3) is carried out analog to digital conversion with analog electrical signal to be made it to become the Raman digital signal and sends to computing machine (4), computing machine (4) is processed the Raman digital signal that receives, and by signal processing circuit (3) and sensor (1) transmitted in both directions control signal and data.
2. a kind of drilling fluid analytical equipment as claimed in claim 1, it is characterized in that, described sensor (1) comprises housing (10) and is arranged on sapphire window (11) on the housing (10), also comprises excitation source (12), avalanche diode detection module (13), right-angle prism (14), dichroic filter (15) in the housing (10); Described avalanche diode detection module (13) arranges at the interval side by side with excitation source (12); The corresponding interval with avalanche diode detection module (13) of described right-angle prism (14) arranges; Described dichroic filter (15) interval is tilting between right-angle prism (14) and sapphire window (11), and corresponding with excitation source (12); Described excitation source (12), right-angle prism (14) form the light path in the sensor (1) with dichroic filter (15), avalanche diode detection module (13).
3. a kind of drilling fluid analytical equipment as claimed in claim 2 is characterized in that, the shape of cross section of described sapphire window (11) is made as plane or cambered surface.
4. a kind of drilling fluid analytical equipment as claimed in claim 2 is characterized in that, described excitation source (12) is the pulse excitation light source; The pulsed frequency of the frequency of operation of described avalanche diode detection module (13) and excitation source (12) is complementary.
5. a kind of drilling fluid analytical equipment as claimed in claim 2, it is characterized in that, also comprise a radiator valve (18) in the described housing (10), described radiator valve (18) is arranged on the periphery of excitation source (12) and avalanche diode detection module (13), and this radiator valve (18) carries out thermostatic control to excitation source (12) and the avalanche diode detection module (13) of its inside.
6. a kind of drilling fluid analytical equipment as claimed in claim 2, it is characterized in that, also comprise one group of Raman optical filter (16) in the housing (10) of described sensor (1), described one group of Raman optical filter (16) is arranged between right-angle prism (14) and the avalanche diode detection module (13); Described one group of Raman optical filter (16) comprises at least a slice narrow band pass filter.
7. a kind of drilling fluid analytical equipment as claimed in claim 6, it is characterized in that, also comprise many group optical fiber in the housing (10) of described sensor (1), each described optical fiber connects excitation source (12), dichroic filter (15), right-angle prism (14), Raman optical filter (16), avalanche diode detection module (13) successively.
8. a kind of drilling fluid analytical equipment as claimed in claim 2, it is characterized in that, also comprise one or more groups lens in the housing (10) of described sensor (1), each described lens is arranged in the light path of sensor (1), regulates and optimize the light path of raman excitation light and Raman diffused light propagation.
9. a drilling fluid analytical approach is used for above-mentioned a kind of drilling fluid analytical equipment, it is characterized in that described analytical approach comprises following steps:
Step 1 is arranged on the sensor (1) of described a kind of drilling fluid analytical equipment in the drilling fluid canal, this drilling fluid analytical equipment is connected with external power source and opens corresponding power switch, and direct supply (2) provides working power to sensor (1);
Step 2, computing machine (4) are passed through signal processing circuit (3) to sensor (1) setup parameter;
Step 3, sensor (1) is launched raman excitation light according to the setup parameter that step 2 receives to the sample (17) in the drilling fluid canal, and receive the sample Raman diffused light that scattering returns that is excited, the light signal of Raman diffused light is converted to analog electrical signal;
Step 4, sensor (1) outputs to signal processing circuit (3) with analog electrical signal, and signal processing circuit (3) is carried out analog to digital conversion to analog electrical signal, makes it to change into the Raman digital signal, and this Raman digital signal is exported to computing machine (4); Step 5, computing machine (4) comprise the concentration of standard sample and the data of Raman scattering light intensity to a kind of hydrocarbons standard sample building database in this database; Computing machine (4) compares analysis with the size of the Raman digital signal that receives and the Raman scattering light intensity data of database Plays sample, calculates the hydrocarbons concentration in the drilling fluid sample.
10. a kind of drilling fluid analytical approach as claimed in claim 9 is characterized in that described step 3 also comprises:
Step 3.1, the excitation source (12) of sensor (1) is outwards launched raman excitation light according to the setup parameter that step 2 receives, step 3.2, because dichroic filter (15) has the characteristic of the light of optionally reflection or a certain frequency range of transmission, the raman excitation light that is transmitted on the dichroic filter (15) is reflected, and the raman excitation light of reflection propagates on the sample in the drilling fluid canal by sapphire window (11);
Step 3.3, sample is by the backward outer scattering Raman diffused light of Raman excitation optical excitation;
Step 3.4, the Raman diffused light that sample scatters propagates on the dichroic filter (15) by sapphire window (11), because dichroic filter (15) has the characteristic of the light of optionally reflection or a certain frequency range of transmission, dichroic filter (15) is crossed in the Raman diffused light transmission, and propagates to right-angle prism (14);
Step 3.5, the Raman diffused light of propagating to right-angle prism (14) is transmitted in the right-angle prism perpendicular to a right angle face of right-angle prism (14), and the inclined-plane that propagates into right-angle prism (14) is inboard, Raman diffused light changes the direction of propagation after through the reflection on inclined-plane to be propagated to another right angle face of right-angle prism (14), and outside this right angle face is transmitted to right-angle prism (14);
Step 3.6, the Raman diffused light that changes the direction of propagation through right-angle prism (14) propagates on the avalanche diode detection module (13), and avalanche diode detection module (13) is converted to analog electrical signal with the light signal of the Raman diffused light that receives.
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| CN201210520562.XA CN102944546B (en) | 2012-12-07 | 2012-12-07 | A kind of drilling fluid analytical equipment and analytical approach thereof |
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| CN106600885A (en) * | 2017-01-19 | 2017-04-26 | 智能（厦门）传感器有限公司 | Safety monitoring and early warning system for lithium battery power of new energy automobile and early warning method |
| CN109540864A (en) * | 2018-10-25 | 2019-03-29 | 华中科技大学 | A kind of coal quality rapid detection method based on PL-Raman spectrum analysis |
| CN111122541A (en) * | 2019-12-25 | 2020-05-08 | 桂林电子科技大学 | Optical fiber probe system for distinguishing Raman signal and fluorescence signal |
| CN111562247A (en) * | 2019-02-13 | 2020-08-21 | 中国石油天然气股份有限公司 | Hydrogen sulfide and carbon dioxide on-line analysis device and method |
| CN112881342A (en) * | 2021-01-12 | 2021-06-01 | 中国地质大学（北京） | On-spot coal seam carbon dioxide source identification system |
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| CN112881342B (en) * | 2021-01-12 | 2022-04-26 | 中国地质大学（北京） | On-spot coal seam carbon dioxide source identification system |
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Effective date of registration: 20190318 Address after: No. 1769 Puxing Road, Minhang District, Shanghai, 20114 Co-patentee after: Shanghai Shenkai Petroleum & Chemical Equipment Corporation Ltd. Patentee after: Shanghai Shenkai Petroleum Sci-Tech Co., Ltd. Co-patentee after: Shanghai Shenkai Petroleum Equipment Co., Ltd. Address before: 201114, Shanghai, Minhang District Pu Xing Road No. 1769 Co-patentee before: Shanghai Shenkai Petroleum Equipment Co., Ltd. Patentee before: Shanghai Shenkai Petroleum & Chemical Equipment Corporation Ltd. |
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