CN105239999B - A kind of method of quick determining multifrequency NMR logging instrument underground transmission power - Google Patents
A kind of method of quick determining multifrequency NMR logging instrument underground transmission power Download PDFInfo
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- CN105239999B CN105239999B CN201510563752.3A CN201510563752A CN105239999B CN 105239999 B CN105239999 B CN 105239999B CN 201510563752 A CN201510563752 A CN 201510563752A CN 105239999 B CN105239999 B CN 105239999B
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Abstract
The invention discloses a kind of methods of quick determining multifrequency NMR logging instrument underground transmission power, including (1) to determine that each working frequency corresponds to the pulsed magnetic field intensity maximum value B under scale transmission power1max；(2) according to each frequency scale transmission power level GAcalIt tests for the first time；Acquire the pulsed magnetic field intensity measured value B of each frequency transmitting1With formation temperature T；(3) institute's pulsed magnetic field intensity measured value B is calculated1mod；(4) judge the pulsed magnetic field intensity measured value B acquired in real time1modWith shop calibration pulsed magnetic field intensity maximum value B1maxBetween error whether meet the requirements；(5) the pulsed magnetic field intensity measured value B acquired in real time according to stratum1mod, calculate the performance number GA of each frequencynext；Until meeting the requirements.The problems such as it is long that the present invention solves existing logger time caused by determining underground transmission power by hand, inaccurate, and logging quality is low.Formation information Real-time Feedback is realized and quickly determines transmission power.This method is conducive to realize, accurately be found automatically.
Description
Technical field
The present invention relates to petroleum exploration logging technical fields, are related to a kind of quick determining multifrequency NMR logging instrument underground
The method of transmission power.
Background technology
Nuclear magnetic resonance log is to utilize nmr phenomena of the proton in known magnetic field, detects formation pore and contained stream
A kind of method of body characteristics.What nuclear magnetic resonance log measured is the die-away time that free precession process after nuclear magnetic resonance occurs for proton
And amplitude.Amplitude information is directly proportional to the quantity of detecting area proton, and formation porosity information can be obtained by scale, it not by
The influence of radioactive source and lithology.
Multifrequency NMR logging instrument is China's development with independent intellectual property right measurement type nuclear magnetic resonance log between two parties
Instrument.It is mainly made of tank circuit, electronic circuit, centralizer and four parts of probe, is made of magnet and antenna wherein popping one's head in.
Using 5 frequency bands, totally 9 different frequencies measure the instrument, generate uniform magnetostatic field by permanent magnet, make in stratum
Hydrogen nuclei generate polarization.Instrument measures between two parties in well, is formed in wellbore stratum by centered on borehole axis, a diameter of
14-16 ", thickness 1mm, high by 24 ", each other at a distance of 9 cylindrical shells of 1mm.
Instrument carries out the measurement of lateral relaxation time using CPMG pulses, corresponding with certain power emission by instrument antenna
Radio-frequency pulse makes in stratum proton rotation be formed by magnetization vector and pulls 90 ° and 180 ° down respectively, formation CPMG pulse sequence,
Echo relaxation signals are received by antenna simultaneously.Nuclear magnetic resonance logging instrument transmission power due to being influenced by wellbore fluid, with
And the influence with temperature is influenced in the electrical characteristics of different depth stratum and water flooding, the transmission power of instrument can be with variation.This
A little variations can not realize 90 ° and 180 ° of switching when can lead to emit CPMG pulses to hydrogen nuclei magnetization vector in stratum, lead
Cause acquisition echo relaxation signals signal-to-noise ratio it is low, cannot in complex reservoir effective identification of hydrocarbon.Nuclear magnetic resonance apparatus at present
General to determine transmission power using the method for manual setting, since frequency is more, each frequency search is primary, leads to hunting time
Long, transmission power is nor best power.It is therefore desirable to can be fed back quickly to determine nuclear magnetic resonance according to stratum using one kind
The method of logging instrument underground transmission power improves logging signal quality.
Invention content
It is an object of the invention to be directed to existing multifrequency nuclear magnetic resonance logging instrument by determining underground transmission power institute by hand
Cause log-time long, power inaccuracy is searched, the problems such as increasing well logging risk indirectly, reduce logging quality.For this purpose, this
Invention proposes a kind of method of quick determining NMR logging instrument underground transmission power, is conducive to realize, can log well
It is accurately found automatically in journey.
The purpose of the present invention is what is realized by following technical proposals.
It provides one kind to feed back based on real-time formation information, power is calculated according to linear approximation principle, it is real by constantly approaching
Now quickly determine transmission power.
A kind of method of quick determining multifrequency NMR logging instrument underground transmission power, includes the following steps：
(1) during multifrequency nuclear magnetic resonance logging instrument transfers underground, the increasing of surrounding formation is measured according to logger
Benefit searches corresponding water tank calibration file, determines that each working frequency corresponds to the pulsed magnetic field intensity under scale transmission power most
Big value B1max；
(2) logger is according to each frequency scale transmission power level GAcalEmit RF magnetic field to stratum, according to each
Frequency scale transmission power level GAcalCarry out first time test；Simultaneous logging instrument acquires each Different Strata band frequency transmitting
Pulsed magnetic field intensity measured value B1With formation temperature T；
(3) the pulsed magnetic field intensity measured value B emitted according to Different Strata band frequency1With formation temperature T, location is calculated
Pulsed magnetic field intensity measured value B under the temperature conditions of interval1mod；
(4) judge the pulsed magnetic field intensity measured value B that this section of stratum acquires in real time1modWith shop calibration pulsed magnetic field intensity
Maximum value B1maxBetween error whether meet the requirements；If met the requirements, show to use the frequency usage under this section of strata condition
Performance number GA is met the requirements, and otherwise, is carried out in next step；
(5) the pulsed magnetic field intensity measured value B acquired in real time according to stratum1mod, calculate the performance number GA of each frequencynext；
Then step (2)-(4) are repeated, until meeting the requirements.
Further, the step (1) determines pulsed magnetic field intensity maximum value B1max, steps are as follows：
(1a) passes through the pulsed magnetic field intensity shop calibration value B ' of each frequency measured when shop calibration1And echo amplitude
Relationship between Amp goes out relational expression according to conic fitting：
In formula, a is quadratic term fitting coefficient, and b is first order fitting coefficient, and c is constant；
(1b) determines pulsed magnetic field intensity maximum value B1max
B1max=(- b)/2a is 2..
Further, the step (2), it is as follows that transmission power when according to scale carries out first time test process：
2a) according to shop calibration RF magnetic field intensity B1calWith frequency scale transmission power GAcalRelationship fits relationship
Formula：
GAcal=Kcal×B1cal+C ③
In formula, KcalFor linear fit coefficient；C is the constant of linear fit；
2b) according to shop calibration pulsed magnetic field intensity maximum value B1max, obtain the first time test transmitting work(of each frequency
Rate GA 'cal
GA’cal=Kcal×B1max+C； ④；
2c) with the first time of each frequency test transmission power GA 'calEmit RF magnetic field, while acquiring corresponding stratum item
Pulsed magnetic field intensity measured value B under part1With formation temperature T.
Further, the pulsed magnetic field intensity measured value under the temperature conditions of stratomere where the step (3) determines
B1mod, steps are as follows：
(3a) tests temperature correction coefficient by workshop temperature, using least square method to formation temperature T and pulse
Magnetic field intensity measured value B1Curve carries out linear fit, calculates corresponding correction coefficient Kt；
(3b) in the case of formation temperature T, if TcIndoor temperature when being scale, then
B1mod=(1+Kt×(T-Tc)×B1 ⑤。
Further, the step (5), calculates the performance number GA of each frequencynext, steps are as follows:
(5a) according to step (1) (2) (3), according to transmission power GA when shop calibrationcalAfter emitting RF magnetic field, institute is acquired
Magnetic field intensity B under the temperature conditions of stratomere1mod；
Magnetic field intensity B under the temperature conditions of stratomere where (5b) is obtained further according to 5. formula1mod, calculate corresponding scale strip
Performance number under part
GA=B1mod×Kcal+C ⑥；
(5c) calculates transmission power GA next timenext：
GAnext=GAcal+(GAcal-GA) ⑦；
After preceding trial twice, test again then using steps are as follows：
It is respectively GA to attempt transmission power used twice before (5d) settingnAnd GAn-1Magnetic field under the conditions of corresponding stratum is strong
Degree is respectively B1mod(n)And B1mod(n-1)；
Wherein, n indicates testing time, palpus >=2 n；
(5e) calculates transmission power level GAnext
(5f) is according to calculating transmission power level GAnextEmit RF magnetic field, while acquiring magnetic field under formation conditions
Intensity, if magnetic field intensity and shop calibration pulsed magnetic field intensity maximum value B1maxBetween error whether meet 5% requirement
With regard to setting the GA currently testednextFor best power, otherwise continue step (5d)-(5f).
Compared with prior art, the present invention having the following advantages that：
1. transmission power GA when by scale and pulsed magnetic field intensity measured value B1It is fitted, accelerates and entirely look into
Process is looked for, only needs to search 3 times under normal circumstances by largely testing；
2. this method can automatically be searched with software realization, while realize 9 frequency parallel work, the transmission power of lookup
GA is accurate；
3. by quickly determining transmission power method, the error rate manually searched can be reduced, it is long to solve the lookup time
The problem of, safety and the timeliness of well logging construction are improved, while accurately transmission power also ensures measurement echo data
Quality.
Description of the drawings
Fig. 1 is the flow chart for quickly determining operating power in multifrequency NMR logging instrument well logging using the present invention；
Fig. 2 is transmission power calculation flow chart in underground of the present invention；
Fig. 3 is the multifrequency NMR logging instrument shop calibration figure that the present invention quotes；
Fig. 4 is the multifrequency NMR logging instrument temperature and RF magnetic field intensity compensation relational graph that the present invention quotes；
Fig. 5 is the multifrequency NMR logging instrument RF magnetic field intensity and transmission power relational graph that the present invention quotes.
Specific implementation mode
Present invention is further described in detail referring to the drawings.
It is of the invention to be as follows shown in referring to Fig.1：
Step 1 measures surrounding formation during multifrequency nuclear magnetic resonance logging instrument transfers underground according to logger
Gain, search corresponding water tank workshop calibration data, determine that each working frequency corresponds to 90 degree under scale transmission power and pulls down
Pulsed magnetic field intensity maximum value B needed for angle1max。
Shop calibration file is loaded, each frequency measured when each frequency scale performance number GA and shop calibration is read
Pulsed magnetic field intensity B '1Etc. parameters, pass through the B of each frequency measured when shop calibration1Relationship between echo amplitude Amp,
Go out relational expression according to conic fitting：
By formula B1max=(- b)/2a is 2.
Determine corresponding RF magnetic field maximum of intensity B1max.As shown in Figure 3.In formula, a is quadratic term fitting coefficient, and b is
First order fitting coefficient, c are constant.
Step 2, transmission power when logger is according to scale carry out first time test.
First, according to shop calibration RF magnetic field intensity and transmission power relationship, relational expression is fitted
GAcal=Kcal×B1cal+C ③
In formula, KcalFor linear fit coefficient；C is the constant of linear fit；
As shown in figure 5, and B determining in step 11max, substitute into the transmission power for calculating and can obtaining testing for the first time
GA’cal
GA’cal=Kcal×B1max+C； ④；
Secondly, with the first time of each frequency test transmission power GA 'calEmit RF magnetic field, while acquiring corresponding stratum
Under the conditions of pulsed magnetic field intensity measured value B1With formation temperature T.
Step 3 calculates the B under the conditions of corresponding stratum1mod。
According to shop calibration RF magnetic field intensity and temperature-compensating relationship, Fig. 4 is seen, using least square method to formation temperature
T and pulsed magnetic field intensity measured value B1Curve is fitted, and calculates corresponding correction coefficient Kt。
In the case of formation temperature T, TcIndoor temperature when being scale, it may be determined that
B1mod=(1+Kt×(T-Tc)×B1 ⑤。
Step 4 compares pulsed magnetic field intensity measured value B1modWith shop calibration pulsed magnetic field intensity maximum value scale B1max
Between error whether meet 5% requirement, if met the requirements, show under this section of strata condition use the frequency scale power
Value GA is met the requirements, and otherwise continues step 5.
Step 5, the pulsed magnetic field intensity measured value B acquired in real time according to stratum1mod, calculate the performance number of each frequency
GAnext；Then step (2)-(4) are repeated, until meeting the requirements.See Fig. 2.
(5a) is set according to step (1) (2) (3) according to transmission power GA when shop calibrationcalAfter emitting RF magnetic field, adopt
Magnetic field intensity B under the temperature conditions of stratomere where under the corresponding formation condition of collection1mod。
(5b) is further according to step 2 relational expression GAcal=Kcal×B1cal+C
It can obtain B ' under formation condition1modPerformance number under the conditions of corresponding scale
GA=B1mod×Kcal+C ⑥；
(5c) calculates transmission power GA next timenext：
GAnext=GAcal+(GAcal-GA) ⑦；
After preceding trial twice, test again then using steps are as follows：
It is respectively GA to attempt transmission power used twice before (5d) settingnAnd GAn-1, correspond to the magnetic field under the conditions of stratum
Intensity is respectively B1mod(n)And B1mod(n-1)；
Wherein, n indicates testing time, palpus >=2 n；
(5e) calculates transmission power level GAnext：
(5f) is according to calculating transmission power level GAnextEmit RF magnetic field, while acquiring magnetic field under formation conditions
Intensity, if magnetic field intensity and shop calibration pulsed magnetic field intensity maximum value B1maxBetween error whether meet 5% requirement
With regard to setting the GA currently testednextFor best power, otherwise continues step (5d) and arrive (5f).
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of method of quick determining multifrequency NMR logging instrument underground transmission power, which is characterized in that this method includes
Following step：
(1) during multifrequency nuclear magnetic resonance logging instrument transfers underground, the gain of surrounding formation is measured according to logger, is looked into
Corresponding water tank calibration file is looked for, determines that each working frequency corresponds to the shop calibration pulsed magnetic field intensity under scale transmission power
Maximum value B1max；
(2) logger is according to each frequency scale transmission power level GAcalEmit RF magnetic field to corresponding stratomere, according to
Each frequency scale transmission power level GAcalCarry out first time test；It is corresponding that simultaneous logging instrument acquires each differently interval
The pulsed magnetic field intensity measured value B of frequency transmitting1With formation temperature T；
(3) according to the pulsed magnetic field intensity measured value B of the corresponding frequency transmitting of differently interval1With formation temperature T, place is calculated
Pulsed magnetic field intensity measured value B under the temperature conditions of stratomere1mod；
(4) the pulsed magnetic field intensity measured value B under the temperature conditions of stratomere where judging1modWith shop calibration pulsed magnetic field strength
Spend maximum value B1maxBetween error whether meet the requirements；If met the requirements, shows to use under the temperature conditions of the stratomere and be somebody's turn to do
Frequency usage performance number GA is met the requirements, and otherwise, is carried out in next step；
(5) according to the pulsed magnetic field intensity measured value B under the temperature conditions of place stratomere1mod, calculate the transmitting work(of each frequency
Rate value GAnext；
It is as follows：
Judge whether to test for the first time, if it is：
(5a) according to step (1) (2) (3), according to frequency scale transmission power level GAcalAfter emitting RF magnetic field, location is calculated
Pulsed magnetic field intensity measured value B under the temperature conditions of interval1mod；
(5b) is further according to shop calibration RF magnetic field intensity B1calWith frequency scale transmission power level GAcalThe Linear Quasi that relationship obtains
Collaboration number, in conjunction with the pulsed magnetic field intensity measured value B under the temperature conditions of place stratomere1mod, calculate corresponding scale condition
Under performance number
GA=B1mod×Kcal+C ⑥；
KcalFor linear fit coefficient；C is the constant of linear fit；
(5c) calculates transmission power level GA next timenext：
GAnext=GAcal+(GAcal‐GA) ⑦；
If not then：After preceding trial twice, test again then using steps are as follows：
It is respectively GA to attempt transmission power used twice before (5d) settingnAnd GAn-1Magnetic field intensity point under the conditions of corresponding stratum
It Wei not B1mod(n)And B1mod(n-1)；
Wherein, n indicates testing time, palpus >=2 n；
(5e) calculates transmission power level GAnext
(5f) is according to calculating transmission power level GAnextEmit RF magnetic field, while acquiring magnetic field intensity under formation conditions,
If magnetic field intensity and shop calibration pulsed magnetic field intensity maximum value B1maxBetween error meet 5% requirement, with regard to setting work as
The transmission power level GA of preceding testnextFor best power, otherwise continue step (5d)-(5f).
2. the method for quick determining multifrequency NMR logging instrument underground transmission power according to claim 1, feature
It is, it is maximum that the step (1) determines that each working frequency corresponds to the shop calibration pulsed magnetic field intensity under scale transmission power
Value B1max, steps are as follows：
(1a) passes through the pulsed magnetic field intensity shop calibration value B ' of each frequency measured when shop calibration1With echo amplitude Amp it
Between relationship, go out relational expression according to conic fitting：
In formula, a is quadratic term fitting coefficient, and b is first order fitting coefficient, and c is constant；
(1b) determines shop calibration pulsed magnetic field intensity maximum value B1max
B1max=(- b)/2a is 2..
3. the method for quick determining multifrequency NMR logging instrument underground transmission power according to claim 1, feature
It is, the step (2), it is as follows that transmission power when according to scale carries out first time test process：
2a) according to shop calibration RF magnetic field intensity B1calWith frequency scale transmission power level GAcalRelationship fits relational expression：
GAcal=Kcal×B1cal+C ③
2b) according to shop calibration pulsed magnetic field intensity maximum value B1max, obtain the first time test transmission power of each frequency
GA’cal
GA’cal=Kcal×B1max+C； ④；
2c) with the first time of each frequency test transmission power GA 'calEmit RF magnetic field, while acquiring each differently interval
The pulsed magnetic field intensity measured value B of corresponding frequency transmitting1With formation temperature T.
4. the method for quick determining multifrequency NMR logging instrument underground transmission power according to claim 1, feature
It is, the pulsed magnetic field intensity measured value B under the temperature conditions of stratomere where the step (3) calculates1mod, steps are as follows：
(3a) tests temperature correction coefficient by workshop temperature, using least square method to formation temperature T and each difference
The pulsed magnetic field intensity measured value B of the corresponding frequency transmitting of stratomere1Curve carries out linear fit, calculates corresponding correction system
Number Kt；
(3b) in the case of formation temperature T, if TcIndoor temperature when being scale, then
B1mod=(1+Kt×(T-Tc)×B1 ⑤。
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| CN111538099B (en) * | 2020-05-06 | 2023-05-26 | 中国石油天然气集团有限公司 | Nuclear magnetic resonance logging speed determining method |
| CN114412456B (en) * | 2022-01-14 | 2022-09-02 | 中国科学院地质与地球物理研究所 | Method for scaling pulse sequence for refined nuclear magnetic resonance logging |
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