SY/T 6493-2000 Nuclear well logging instrument value transfer procedure
Some standard content:
ICS 73.020
Registration number: 8168—2011
Petroleum and natural gas industry standard of the People's Republic of ChinaSY/T 64932000
Specification for value transfer in nuclear well logging tools200-12-12Release
State Administration of Petroleum and Chemical Industry
2101—(6-01Implementation
SY/T 6493—2000
State standard
Value transfer system for nuclear well logging tools
Value transfer instrument requirements
Measurement requirements
Transfer steps
Value transfer data type
Value transfer requirements
Appendix A (record of the standard)
Measurement response function of transmitter
1 Scope
Petroleum and natural gas industry standard of the People's Republic of China Value transfer procedure for nuclear well logging tools
Specification for value transfer in nuclear well logging tools This standard specifies the value transfer system and value transfer method for nuclear well logging tools: This standard is used for - Value transfer of nuclear well logging instruments and their measuring standard instruments 2 Reference standards
SY/T 6493—20M
The provisions contained in the following standards constitute the provisions of this standard by reference. When this standard is published, the versions indicated are valid. All standards may be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards: JG (Petroleum) 47—1999 Compensated neutron calibration procedure JG (Petroleum) 48—1999 Verification procedure for natural gamma ray calibrator JIG1027—91 Measurement error and data processing SY/T 5129-—1996 Density meter calibration SY6179-1996 Compensated neutron film meter calibration procedure SY.T6255-—1996 Natural gamma ray meter calibration 3 Definitions
This standard uses the following definitions
3.1 Standard of measurement instruments with the highest measurement accuracy ihif:udepaitrentThe highest measurement standard instrument in the industry that unifies the measurement value in the professional field of the oil industry, acts as a benchmark, and is usually a physical standard device.
3.2 Working standard far wl logging Standard analogue scale that is used for measurement transfer or comparison through the highest measurement standard device in the industry, so it is usually a physical standard device. 3.3 Standarc calibratofStandarc calibratof1. Standard measurement instrument that is used for measurement transfer or comparison through the highest measurement standard device in the industry or standard well, so it is usually a physical standard device.
3.4 Measurement value transfer instrumentinstrunentsforvaluctrarsferThe instrument that serves as a medium for measurement transfer or comparison of standard measurement instruments, such as the definition of standard instruments and acquisition system standard instruments, see JJG (Petroleum) 47, G (Petroleum) 48. 3,5 Verifiercherk device
It is a device used to verify the stability of measurement value transfer instruments. Nuclear well logging instrument value transfer system
1.1 Block diagram of nuclear well logging instrument value transfer system, see Figure [4.2 Description of value transfer system:
The uncertainty of each level of the standard instrument in the value transfer system is most determined by the uncertainty of the upper level standard instrument, which is supplemented by the uncertainty of the upper level standard instrument. ||National standard products
National value transfer
Optical products
Uncertain weight products
Working standard brand
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Communication channel
Unadjustable
Figure 1 Nuclear well instrument measurement value transfer system diagram - 3 to 5 times of standard uncertainty. The measurement value transfer path can be selected according to needs. 5 Requirements for measurement value transfer instruments
5.1 For the measurement value transfer between the physical standard device and the simulation standard device, the standard receiver should be a measuring instrument of the same model as the simulation standard device. SY/T6493-2000
And only: For the measurement value transfer between physical standard devices, the selection of standard instrument models is not restricted. 5.2 The standard instrument should be subject to long-term stability assessment, and the relative stability error should be within ±1 %, the statistical uncertainty of the standard instrument detector count measurement should be within ±0.3%. 5.3
The counting rate error of the ground acquisition system should be within ±0.1%. 5.4
Before using the standard instrument, use a standard verifier for calibration: the verification error should be within ±1%, 5.5
Re-value transfer measurement requirements
The interval between standard formation measurement points is not more than 10cmg6.1
Each measurement point should be repeated 11 times in one measurement cycle. 6.2
The total measurement time for each measurement point should ensure that the total count of each detector is not less than 90,000 pulses, and the value transmission step
7.1 The highest metering device is transferred to the working standard well7.1.1 The value transmission instrument is used to measure the high Measure in the device and establish the relationship between the measured value of the transmission instrument and the nominal value of the highest metering device, that is, the transmission instrument response function. Determine the coefficients of the response function and the variance and covariance of each coefficient. 7.1.2 Use the standard instrument to measure in the working standard well, and calculate the value and uncertainty of the working standard well based on the measured value and the transmission instrument response function.
7.2 The highest metering device is transferred to the standard calibrator. 7.2.1 Week 71.1.
7.2.2 Use the standard instrument to measure the standard calibrator, and calculate the value and uncertainty of the standard calibrator based on the measured value and the transmission instrument response function.
7.3 Working standard well is transferred to the standard calibrator. 7.3.1 Use the standard instrument to calibrate in the working standard well and determine the system coefficients and their uncertainties. 7.3.2 Use the standard instrument to measure the standard calibrator, and substitute the full value and the scale coefficient into the response function to calculate the value and uncertainty of the standard calibrator.
7.4 The value transfer process from standard calibrator to nuclear measuring instrument is as follows: see SY/T6179, SY/T6255 and SY/T5129.
8 Data processing for value transfer
8.1.1 Class A standard uncertainty
Evaluate by statistical methods. Calculate the measured values under repeated conditions according to the Bessel method. See JG1027-91 Bessel method. 8.1.2 Type B standard uncertainty
Convert the limit error of long-term stability measurement and the difference between the limit error measurement in the stability monitoring program into relative standard uncertainty, and take the larger one as the relative standard uncertainty within the range of measurement value. 1.3 Standard uncertainty
The standard uncertainty of the measurement value is the combination of Type A standard uncertainty and Type B standard uncertainty, see JG1027 for the comprehensive standard error
. 1.4 Total uncertainty
For the determination of total uncertainty, see JG1027 for the total uncertainty. 8.2 Determination of transfer instrument response sensitivity It is recommended to use the transfer instrument response rain number reporting method specified in Appendix A (Appendix B of the standard). 8.3 Determination of transfer value and uncertainty of H The transfer value is calculated according to formula (1): Where: - transfer value; u, (i = 0, l, ---, m) - SY/T 6493--2000 Y = f (a, uo, aia.) - transfer instrument response function coefficient; - transfer instrument response function; f, a:) - function of the detector measurement value The uncertainty of the transfer value is calculated according to formula (2): 2aya + 22af) - Cor (ui, a,) 1 Formula:α
is the uncertainty of the transmission value;
is the uncertainty of the measurement function,
is the ten-term response function, and equation (2) is written in matrix form, see (3): WFevare +(ly?
F. = (1.x,??,\2\)
The covariance matrix of the response function coefficients;
is composed of rows to the maximum.
9 Requirements for value transfer
9.1 Newly built working standard wells should be transferred or compared with the highest measurement standard device in the industry, and the in-use working standard wells should be transferred with the highest measurement standard device after repair. 9.2 Newly produced standard calibrators and in-use standard calibrators after repair should be transferred with the highest measurement standard device or working standard.
9.3 The measuring instrument should be transferred with the standard calibrator before measurement. A1 Determine the form of the response function
$Y/F (493--2(H)
Appendix
(Appendix of the standard)
Transfer instrument response function simulation method
According to the measurement principle of the measuring instrument, the simulation calculation of the mathematical model or the distribution form of the measurement points of the physical standard device, the response function form is determined. For the polynomial function form, the polynomial order is selected in the data fitting process, and A2 determines the response function coefficients and its covariance matrix. The response function is recommended to adopt the polynomial form shown in formula (A1): y = an+ aj-r + i2r2 +a3-3
According to the least squares method, the coefficient vector A is calculated according to formula (A2): A=(FTWE)FWY
The covariance matrix VA of the coefficient is calculated according to formula (A3): YA=(FFWF) 1
The weighted residual sum of squares of the fitting is calculated according to formula (A4): C =(Y :FA)TW(Y
Wherein: Y-
The column vector of the fixed value y (=1,2,…) of the superior standard, the number of the highest measurement standard device: a polynomial coefficient a, (一,1,…班) The column vector of the domain, m is the polynomial order; A
F--a function of the measured value, (:=1,2.n) composed of a matrix, the form of the function is related to the type of instrument [such as the Western form of the compensated neutron detector is the ratio of the short source moment detector measurement value to the long travel moment detector measurement value). W--a weight diagonal matrix, corresponding to the weight of each measurement point. A selects the fitting weight
First set the weight matrix as formula (A5):
Where: a.(i=,2,n)-
-the uncertainty of the previous level standard.
According to formula (A1) and formula (A2), the response function o is calculated, then the weight matrix is formula (A6), where; (f-1,2,n) is according to s
Formula (A7) Calculation:
Select the polynomial order
Calculate the F factor according to formula (A8)
Where: \--number of measurement points;
——polynomial order:
SY/T (493—20MH)
Fe m (nk )(C--
（-weighted residual sum of squares of first-order polynomial fitting, calculated according to formula (A4). (A6)
When F,≤F,, -1 is the selected polynomial order, where F, is the critical value of the F distribution with a degree of 1 and -k-1 at a significant level (.05),
A5 Determine the quality of fitting
Calculate the weighted residual sum of squares according to formula (A4) [here called the goodness of fit factor) C, when C≤, (is the critical value of the ~ distribution with a degree of \-m at a significant level of 0.05). The fitting quality is qualified, otherwise it is discarded, find the cause and refit 6
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