CN107132250A - A kind of measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics - Google Patents
A kind of measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics Download PDFInfo
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- CN107132250A CN107132250A CN201710307023.0A CN201710307023A CN107132250A CN 107132250 A CN107132250 A CN 107132250A CN 201710307023 A CN201710307023 A CN 201710307023A CN 107132250 A CN107132250 A CN 107132250A
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- coal sample
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- dispersion characteristics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The invention discloses a kind of measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics, 1 N lump coal samples are gathered, 1 is respectively labeled as#‑N#Coal sample, is measured respectively by the same way：Step S1：Coal sample is processed into the square coal cinder that the length of side is 60mm, drying operation is carried out to the coal sample processed；Coal sample is placed into drying tower after weighing；Step S2：The coal sample dried in step S1 is completely immersed in distilled water, scales/electronic balance weighing is used every time t, at normal temperatures and pressures, using impedometer, the measurement of telegram in reply property is carried out to aqueous coal sample, coal sample is put into distilled water by measurement again after finishing, and is no longer changed until weighing；Step S3：With origin softwares, the telegram in reply Dispersion Characteristics curve of different water cut coal sample is obtained.The present invention using telegram in reply property measuring method, measurement different water cut saturation degree under coal body telegram in reply property Dispersion Characteristics, and then by hydraulic fracturing press off effect with telegram in reply property be associated, for underground raising coal seam permeability technical support is provided.
Description
Technical field
The invention belongs to the technical field of geological exploration of coal, more particularly to a kind of different water cut saturation degree coal body telegram in reply property
The measuring method of Dispersion Characteristics.
Background technology
Coal mine gas drainage is to take precautions against coal mine gas explosion, promotes Safety of Coal Mine Production powerful guarantee.The difficulty of gas pumping
Easy degree has much relations with coal seam permeability.Hydraulic fracturing can improve coal seam permeability, and how using a kind of simple and direct fast
The method of speed presses off effect to evaluate hydraulic fracturing, is the problem of we pay close attention to instantly.
The content of the invention
It is an object of the invention to provide a kind of measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics, gathers 1-N lump coal samples, N is natural number, point
Biao Ji not be#-N#Coal sample, to 1#-N#Coal sample is measured respectively by the same way, and measurement comprises the following steps：
Step S1：Coal sample is processed into the square coal cinder that the length of side is 60mm, drying operation is carried out to the coal sample processed；Then
Dried coal sample is put and dried in the air into drying tower to room temperature, coal sample is placed into drying tower after weighing；
Step S2：The coal sample dried in step S1 is completely immersed in distilled water, scales/electronic balance weighing is used every time t,
Under normal temperature and pressure, using impedometer, the measurement of telegram in reply property is carried out to aqueous coal sample, coal sample is put into distillation by measurement again after finishing
In water, no longer changed until being weighed after 72 hours；
Step S3：With origin softwares, using logarithmic coordinates system, the double Y-axis curves of R-Hz-X are drawn, by the measurement in step S2
Data carry out polynomial curve fitting, obtain the telegram in reply Dispersion Characteristics curve of different water cut coal sample；
Step S4：The telegram in reply Dispersion Characteristics curve of different water cut coal sample in analytical procedure S3.
Preferably, in step sl, using drying box, drying operation, the temperature of drying box are carried out to the coal sample processed
Degree is set to 105 degree, and coal sample is taken out from drying box every 1 hour and is weighed once, until the mass change of coal sample is small
Untill when 0.01 gram or quality are no longer reduced, regard now coal sample is drying regime, saturation degree is designated as 0.
Preferably, described drying box uses DHG-914CA electric heating constant-temperature blowing drying boxes.
Preferably, in step s 2, at normal temperatures and pressures, being entered using impedometer and fixing device to aqueous coal sample
The property measurement of row telegram in reply；Described fixing device includes gantry frame, and the bottom of the inner chamber of gantry frame is provided with red copper conductor, coal sample
The upper surface of red copper conductor is located at, the upper surface of coal sample is provided with red copper conductor, and the upper surface of the red copper conductor of coal sample upper end is provided with
Nylon insulating barrier, the upper end of gantry frame is provided with regulation turn-knob, and the lower end of regulation turn-knob is connected with nylon insulating barrier；Two red coppers
Conductor connects the measurement signal input of impedometer by wire respectively.
Preferably, described impedometer uses LCR3533-01 impedometers, first impedometer is carried out
The preheating of one hour；Then the compensation button of impedometer is clicked on, impedometer is compensated automatically, to improve measurement
Precision；Frequency range is adjusted to 1Hz-200kHz, measurement parameter is set to R and X, measures the telegram in reply impedance real part of aqueous coal sample
Coal sample is put into distilled water by R, imaginary part X each 200 points of value, measurement again after finishing.
Preferably, in step s3, each 200 points frequency f changing values corresponding with its of impedance real part R, imaginary part X are inputted
Origin softwares, using frequency f as abscissa, impedance real part R, imaginary part X are ordinate, using logarithmic coordinates system, generate R-Hz-X
Double Y-axis scatter diagrams, using the order polynomial curve matching of origin highest fitting of a polynomials number of times 9, make R2>0.95, it is approximately considered
Matched curve is scatter diagram law curve, the telegram in reply Dispersion Characteristics curve of different water cut coal sample is obtained, by under different saturation
The X of coal sample is plotted on a figure with f change curves.
Preferably, in step s 4, the different water cut saturation degree coal body telegram in reply property Dispersion Characteristics for analyzing different coal samples are bent
Line, R reduces as frequency f increases, and three-stage rule is presented with frequency f in X, and with the increase of coal sample water saturation, coal
Sample imaginary impedance X profile is gradually reduced.
Preferably, described N=4, coal sample includes 1#Coal sample, 2#Coal sample, 3#Coal sample and 4#Coal sample, 1#Coal sample is anthracite,
2#Coal sample is meager lean coal, 3#Coal sample is coking coal, 4#Coal sample is rich coal.
Present invention has the advantage that：
The present invention is using telegram in reply property measuring method, coal body telegram in reply property Dispersion Characteristics under measurement different water cut saturation degree, and then by water
Force to split and press off effect and be associated with telegram in reply property, corresponding when not pressing off is dry water, and corresponding when pressing off completely is
Saturation water, partly presses off state and also can estimate it according to its multiple corresponding water saturation interval of electrical parameter and partly press off effect.
It is different according to the multiple electrical property feature of coal body under different water cut saturation degree, by measuring the multiple electrical property feature of coal body, with reference to itself and corresponding coal
The water saturation relation of body, and then can improve coal seam permeability for analysis fracturing effect for underground and technology is provided
Support and experiment support.
Brief description of the drawings
Fig. 1 is the connection diagram of impedometer in the present invention and fixing device；
Fig. 2 is 1 in the present invention#Coal body Dispersion Characteristics are bent under impedance real part R and imaginary part X under a certain water saturation for coal sample
Line；
Fig. 3 is 1 in the present invention#Coal sample different water cut saturation degree coal body X with f Dispersion Characteristics curve；
Fig. 4 is 2 in the present invention#Coal sample different water cut saturation degree coal body X with f Dispersion Characteristics curve；
Fig. 5 is 3 in the present invention#Coal sample different water cut saturation degree coal body X with f Dispersion Characteristics curve；
Fig. 6 is 4 in the present invention#Coal sample different water cut saturation degree coal body X with f Dispersion Characteristics curve；
Fig. 7 is the coal body telegram in reply property Dispersion Characteristics curve law in the present invention.
1 is LCR3533-01 impedometers, and 2 be four terminal pair configuration, and 3 be coal sample, and 4 be red copper conductor, and 5 be that nylon insulate
Structure, 6 be gantry frame, and 7 be regulation turn-knob.
Embodiment
As Figure 1-3, anthracite coal sample is gathered, labeled as 1#Coal sample, to 1#Coal sample is measured, and measurement includes as follows
Step：
Step S1：By 1#Coal sample is processed into the coal cinder of 60mm square, using DHG-914CA electric heating constant-temperature blowing drying boxes,
To process 1#Coal sample carries out drying operation.Temperature setting is 105 degree, and 1 is taken out from drying box every 1 hour#Coal sample is entered
Row is weighed once, until 1#Untill the mass change of coal sample is less than when 0.01 gram or quality are no longer reduced, depending on now 1#Coal sample is dry
Dry state, saturation degree is designated as 0.Then by this drying 1#Coal sample, which is put, dries in the air into drying tower to room temperature, is put into after weighing in drying tower.
Step S2：By 1#Coal sample is completely immersed in distilled water, and scales/electronic balance weighing is used every 6h, at normal temperatures and pressures,
Using LCR3533-01 impedometers and fixing device to aqueous 1#Coal sample carries out the measurement of telegram in reply property.First to impedometer
Carry out the preheating of a hour.Then the compensation button of impedometer is clicked on, impedometer is compensated automatically, to improve
Measurement accuracy.Frequency range is adjusted to 1Hz-200kHz, measurement parameter is set to R and X, and voltage is 1V.Fixing device includes dragon
Door frame, the bottom of the inner chamber of gantry frame is provided with red copper conductor, 1#Coal sample is located at the upper surface of red copper conductor, 1#Coal sample it is upper
End face is provided with red copper conductor, 1#The upper surface of the red copper conductor of coal sample upper end is provided with nylon insulating barrier, and the upper end of gantry frame is set
There is regulation turn-knob, the lower end of regulation turn-knob is connected with nylon insulating barrier；Two red copper conductors are connected by four terminal pair configuration respectively
The measurement signal input of impedometer, four terminal pair configuration can reduce error, measurement aqueous 1#The multiple electrical resistance of coal sample is real
Portion R, imaginary part X each 200 points of value, are measured after finishing again by 1#Coal sample is put into distilled water, is no longer sent out until being weighed after 72 hours
Changing, that is, think 1#Coal sample is aqueous to reach saturation.
Step S3：Each 200 points frequency changes corresponding with its of impedance real part R, imaginary part X are inputted into origin softwares, with
Frequency is abscissa, and impedance real part R, imaginary part X are ordinate, and using logarithmic coordinates system, the double Y-axis scatter diagrams of generation R-Hz-X are adopted
With the order polynomial curve matching of origin highest fitting of a polynomials number of times 9, make R2>0.95, matched curve is approximately considered for scatterplot
Figure law curve, obtains different water cut 1#The telegram in reply Dispersion Characteristics curve of coal sample, the X of coal body under different saturation is become with f
Change Drawing of Curve on a figure.
Step S4：Analyze different water cut saturation degree coal body telegram in reply property Dispersion Characteristics curve, R reduces as frequency f increases, X with
Frequency f and three-stage rule is presented, and with the increase of coal body water saturation, coal body imaginary impedance X profile is gradually reduced.
As shown in Fig. 1,4, meager lean coal coal sample is gathered, labeled as 2#Coal sample, to 2#Coal sample is measured according to step 1-4.
As shown in Figure 1,5, coking coal coal sample is gathered, labeled as 3#Coal sample, to 3#Coal sample is measured according to step 1-4.
As a shown in Figure 6, rich coal coal sample is gathered, labeled as 4#Coal sample, to 4#Coal sample is measured according to step 1-4.
Table 1
Table 1 is in order that method has applicability, and the coal that different rank is gathered respectively is used as 1#-4#Coal sample, respectively not
With its telegram in reply property Dispersion Characteristics is surveyed under water saturation, its measurement result distinguishes corresponding diagram 3-6.According to a variety of different ranks
The telegram in reply Dispersion Characteristics curve of coal sample, its curve law is as shown in Figure 7：AB is low frequency phase, and the corresponding time is longer, has and fills
The time of foot polarizes, and X increases and reduced with f, and this stage is induced polarization；BC is intermediate frequency phase, excites to intensify and gradually subtracts
Weak, X increases and increased with f, and this stage is electromagnetic induction；CD is the high frequency stage, and X reduces as f increases, and this stage is dielectric
Polarization.Meet rock electricity Dispersion Characteristics, carrying out coal petrography exploration for telegram in reply property lays solid experiment basis.
Embodiment described above is only that the preferred embodiment of the present invention is described, and is set not departing from the present invention
On the premise of meter spirit, various modifications and improvement that those of ordinary skill in the art make to technical scheme all should
In the protection domain for falling into claims of the present invention determination.
Claims (8)
1. a kind of measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics, it is characterised in that：Gather 1-N lump coal
Sample, N is natural number, is respectively labeled as 1#-N#Coal sample, to 1#-N#Coal sample is measured respectively by the same way, and measurement is wrapped
Include following steps：
Step S1：Coal sample is processed into the square coal cinder that the length of side is 60mm, drying operation is carried out to the coal sample processed；Then
Dried coal sample is put and dried in the air into drying tower to room temperature, coal sample is placed into drying tower after weighing；
Step S2：The coal sample dried in step S1 is completely immersed in distilled water, scales/electronic balance weighing is used every time t,
Under normal temperature and pressure, using impedometer, the measurement of telegram in reply property is carried out to aqueous coal sample, coal sample is put into distillation by measurement again after finishing
In water, no longer changed until being weighed after 72 hours；
Step S3：With origin softwares, using logarithmic coordinates system, the double Y-axis curves of R-Hz-X are drawn, by the measurement in step S2
Data carry out polynomial curve fitting, obtain the telegram in reply Dispersion Characteristics curve of different water cut coal sample；
Step S4：The telegram in reply Dispersion Characteristics curve of different water cut coal sample in analytical procedure S3.
2. the measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics as claimed in claim 1, it is characterised in that：
In step sl, using drying box, drying operation is carried out to the coal sample processed, the temperature setting of drying box is 105 degree, every
1 hour takes out coal sample from drying box and weighed once, until the mass change of coal sample is less than 0.01 gram or quality no longer
Untill during reduction, regard now coal sample is drying regime, saturation degree is designated as 0.
3. the measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics as claimed in claim 2, it is characterised in that：
Described drying box uses DHG-914CA electric heating constant-temperature blowing drying boxes.
4. the measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics as claimed in claim 3, it is characterised in that：
In step s 2, at normal temperatures and pressures, the measurement of telegram in reply property is carried out to aqueous coal sample using impedometer and fixing device；It is described
Fixing device include gantry frame, the bottom of the inner chamber of gantry frame is provided with red copper conductor, and coal sample is located at the upper of red copper conductor
End face, the upper surface of coal sample is provided with red copper conductor, and the upper surface of the red copper conductor of coal sample upper end is provided with nylon insulating barrier, gantry frame
The upper end of frame is connected provided with regulation turn-knob, the lower end of regulation turn-knob with nylon insulating barrier；Two red copper conductors pass through wire respectively
Connect the measurement signal input of impedometer.
5. the measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics as claimed in claim 4, it is characterised in that：
Described impedometer uses LCR3533-01 impedometers, and the preheating of a hour is first carried out to impedometer；So
The compensation button of impedometer is clicked on afterwards, and impedometer is compensated automatically, to improve measurement accuracy；Frequency range is adjusted
For 1Hz-200kHz, measurement parameter is set to R and X, measures telegram in reply impedance real part R, the imaginary part X value each 200 of aqueous coal sample
Coal sample is put into distilled water by point, measurement again after finishing.
6. the measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics as claimed in claim 5, it is characterised in that：
In step s3, each 200 points frequency f changing values corresponding with its of impedance real part R, imaginary part X are inputted into origin softwares, with frequency
F is abscissa, and impedance real part R, imaginary part X are ordinate, and using logarithmic coordinates system, the double Y-axis scatter diagrams of generation R-Hz-X are used
The order polynomial curve matching of origin highest fitting of a polynomials number of times 9, makes R2>0.95, matched curve is approximately considered for scatter diagram
Law curve, obtains the telegram in reply Dispersion Characteristics curve of different water cut coal sample, and the X of coal sample under different saturation is changed into bent with f
Line is plotted on a figure.
7. the measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics as claimed in claim 6, it is characterised in that：
In step s 4, the different water cut saturation degree coal body telegram in reply property Dispersion Characteristics curve of different coal samples is analyzed, R increases with frequency f
And reduce, X with frequency f present three-stage rule, and with coal sample water saturation increase, coal sample imaginary impedance X profile by
Gradually decline.
8. the measuring method of different water cut saturation degree coal body telegram in reply property Dispersion Characteristics as claimed in claim 7, it is characterised in that：
Described N=4, coal sample includes 1#Coal sample, 2#Coal sample, 3#Coal sample and 4#Coal sample, 1#Coal sample is anthracite, 2#Coal sample is meager lean coal, 3#
Coal sample is coking coal, 4#Coal sample is rich coal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112836861A (en) * | 2021-01-12 | 2021-05-25 | 江苏师范大学 | Time-varying model establishment method for coal sample quality change rate under water-rock action |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5610524A (en) * | 1994-09-09 | 1997-03-11 | Institut Francais Du Petrole | Device for petrophysical measurement and implementation method |
| EP1398630A1 (en) * | 2002-09-11 | 2004-03-17 | Institut Francais Du Petrole | Method for determining the resistivity index, as a function of the water saturation, of certain rocks with complex porosity |
| JP2007256267A (en) * | 2006-02-22 | 2007-10-04 | Saga Univ | Porosity valuation method of grinding stone using capacitance and dielectric constant |
| CN105115793A (en) * | 2015-06-26 | 2015-12-02 | 河海大学 | Method for rapidly preparing samples with different water saturations |
| CN105987933A (en) * | 2015-02-11 | 2016-10-05 | 中国石油化工股份有限公司 | Measurement device for rock resistivity test and special-purpose electrode pad thereof |
| CN106133732A (en) * | 2015-06-26 | 2016-11-16 | 西南石油大学 | A kind of rock water saturation computational methods |
-
2017
- 2017-05-04 CN CN201710307023.0A patent/CN107132250A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5610524A (en) * | 1994-09-09 | 1997-03-11 | Institut Francais Du Petrole | Device for petrophysical measurement and implementation method |
| EP1398630A1 (en) * | 2002-09-11 | 2004-03-17 | Institut Francais Du Petrole | Method for determining the resistivity index, as a function of the water saturation, of certain rocks with complex porosity |
| JP2007256267A (en) * | 2006-02-22 | 2007-10-04 | Saga Univ | Porosity valuation method of grinding stone using capacitance and dielectric constant |
| CN105987933A (en) * | 2015-02-11 | 2016-10-05 | 中国石油化工股份有限公司 | Measurement device for rock resistivity test and special-purpose electrode pad thereof |
| CN105115793A (en) * | 2015-06-26 | 2015-12-02 | 河海大学 | Method for rapidly preparing samples with different water saturations |
| CN106133732A (en) * | 2015-06-26 | 2016-11-16 | 西南石油大学 | A kind of rock water saturation computational methods |
Non-Patent Citations (2)
| Title |
|---|
| 童茂松 等: "《泥质砂岩的复电阻率实验研究》", 《测井技术》 * |
| 郭晓洁 等: "《构造煤复电性实验及其特征研究》", 《煤田地质与勘探》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112836861A (en) * | 2021-01-12 | 2021-05-25 | 江苏师范大学 | Time-varying model establishment method for coal sample quality change rate under water-rock action |
| CN112836861B (en) * | 2021-01-12 | 2022-02-01 | 江苏师范大学 | Time-varying model establishment method for coal sample quality change rate under water-rock action |
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