CN114354059A - Calibration method and device of non-bearing type load measuring instrument - Google Patents
Calibration method and device of non-bearing type load measuring instrument Download PDFInfo
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- CN114354059A CN114354059A CN202111604061.5A CN202111604061A CN114354059A CN 114354059 A CN114354059 A CN 114354059A CN 202111604061 A CN202111604061 A CN 202111604061A CN 114354059 A CN114354059 A CN 114354059A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004364 calculation method Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000012795 verification Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The invention discloses a calibration method and a device for a non-bearing load measuring instrument, wherein standard polished rods are automatically loaded and unloaded at 20kN intervals within the range of 0-120 kN through calibration software in a computer, the load measuring instrument arranged on the standard polished rods is calibrated, a calibration coefficient is obtained through calculation of a regression equation set, and the load measuring instrument is calibrated by adopting the calibration coefficient. The invention can automatically and synchronously acquire the load value of the loading platform and the micro-deformation measurement value of the load measuring instrument in real time, and automatically finish calibration, coefficient calculation and verification. The calibration device and the calibration method of the non-bearing load measuring instrument are suitable for calibration and verification of the non-bearing load measuring instrument used in the current oil field.
Description
Technical Field
The invention relates to a calibration method of a non-bearing load measuring instrument and a device used by the calibration method, and belongs to the technical field of oilfield testing.
Background
The polished rod load and polished rod displacement tested by the pumping unit polished rod load measuring instrument form a polished rod indicator diagram, and the well condition of an oil well and the liquid production amount of the oil well can be analyzed and calculated through the polished rod indicator diagram, so that the method is an important means for testing the oil well.
The oil pumping machine load measuring instrument for the oil field has two types: the first is a bearing type, namely, a polished rod load is directly applied to a pressure sensor of a load measuring instrument, and the output signal of the pressure sensor is processed and calculated to obtain the load; the second type is a non-bearing type load measuring instrument, namely the load measuring instrument does not bear the load of the polished rod, two pins of the non-bearing type load measuring instrument and a locking screw rod top head are clamped on the polished rod, and the load value is indirectly calculated by measuring the micro deformation of the diameter of the polished rod when the polished rod is loaded.
The method for calibrating the non-load-bearing load measuring instrument generally comprises the following steps: before the whole measuring instrument is assembled, the used micro-deformation sensors are calibrated, force is applied to the induction shafts of the micro-deformation sensors during calibration to enable the induction shafts to generate standard micro-deformation, the number of the standard micro-deformation is multiple, then output voltages of the sensors under the multiple standard micro-deformation are recorded, and the calibration meter of the micro-deformation sensors is obtained. In actual operation, the calibration method needs manual regulation to apply standard micro-deformation, has high requirements on operators, long calibration time and low efficiency, and has more precise standard micro-deformation equipment and high maintenance requirement cost. Therefore, the prior art still has the defects and needs to be improved.
Disclosure of Invention
The invention aims to provide a calibration method of a non-bearing load measuring instrument and a device used by the calibration method, which have the advantages of simple structure, low manufacturing cost, small measuring error and convenient operation, and overcome the defects of the current calibration technology and equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a calibration method of a non-bearing load measuring instrument, which is characterized by comprising the following steps: the method comprises the steps of automatically loading and unloading a standard polished rod at intervals of 20kN within the range of 0-120 kN through standard inspection software in a computer, calibrating a load measuring instrument installed on the standard polished rod, obtaining a calibration coefficient through calculation of a regression equation set arranged in the computer, and calibrating the load measuring instrument through the calibration coefficient, so that a loading platform load value and a load measuring instrument micro-deformation measurement value can be automatically and synchronously acquired in real time through the computer, and calibration, coefficient calculation and calibration are automatically completed.
In the method, the specific calibration steps are as follows:
the method comprises the following steps that firstly, a standard polished rod provided with a load measuring instrument is vertically placed between a lower top column and an upper top column of a loading platform; starting the marking software on the computer, controlling the lower top pillar of the loading platform to move upwards through the marking software, enabling the top end of the standard polished rod to be in contact with the bottom surface of the upper top pillar, and adjusting the load measuring instrument to 0kN as a reference value X0；
Step two, the lower top pillar of the loading platform is controlled by the calibration software to continuously apply load to the standard polished rod, and the measured values X of the load measuring instrument are respectively recorded at a 20kN calibration point, a 40kN calibration point, a 60kN calibration point, an 80kN calibration point, a 100kN calibration point and a 120kN calibration pointLoading 20、XLoading 40、XLoading 60、XLoading 80、XLoading 100、XLoading 120；
Step three, the lower ejection column of the loading table is controlled to unload the standard polished rod through the calibration software, and the measured values X of the load measuring instrument are recorded at a 100kN calibration point, an 80kN calibration point, a 60kN calibration point, a 40kN calibration point, a 20kN calibration point and a 0kN calibration point respectivelyUnloading 100、XUnloading 80、XUnloading 60、XUnloading 40、XUnloading 20、XUnload 0；
Step four, taking the measured value of each calibration point in the loading and unloading process to calculate the average measured value X of each calibration point20、X40、X60、X80、X400、X120(ii) a Calculating the calibration coefficient A, B, C of each calibration point through a regression equation set;
the regression equation set is as follows:
F0=A+BX0+CX0 2
F20=A+BX20+CX20 2
F40=A+BX40+CX40 2
F60=A+BX60+CX60 2
F80=A+BX80+CX80 2
F100=A+BX100+CX100 2
F120=A+BX120+CX120 2
in the formula: f-is the standard load of different calibration points;
x-is the average measurement of different calibration points;
A. b, C-is a calibration coefficient calculated according to a regression equation set;
step five, after the calibration coefficient A, B, C is determined, substituting the actually measured load value X of the load measuring instrument into the equation F = A + BX + CX2Calculating the actual load value F, and then comparing the actual load value F with the standard load F0And calculating the verification precision by the difference obtained by subtracting.
The device used in the method comprises a loading platform and a load measuring instrument; an upper top column and a lower top column are arranged on the loading platform; the loading platform is connected with a computer through a communication cable, and the computer is connected with the wireless transceiving module; the load measuring instrument is arranged in the middle of a standard polished rod used for calibrating the loading platform.
In the above device, the load measuring instrument is a non-load bearing load measuring instrument.
In the device, the computer is internally provided with standard inspection software.
In the device, the standard polished rod is round steel with the diameter phi of 25mm, the total length of the standard polished rod is 146mm, the standard polished rod is in threaded connection with the lower top column, and one end of the standard polished rod is provided with threads M10-6e capable of being installed in a central threaded hole of the lower top column.
Due to the adoption of the technical scheme, compared with the prior art, the method and the device have the following characteristics:
1. the invention calibrates the non-bearing load measuring instrument by the deformation formed by loading the standard polished rod.
2. The deformation of the load measuring instrument is directly converted into the polished rod load, the mode of calibrating the deformation of the measuring instrument by standard deformation is simpler compared with the conventional calibration, and errors caused by additional installation, operation and the like in the conventional calibration can be avoided.
3. The invention calibrates the whole non-bearing load measuring instrument, and avoids the installation error caused by calibrating the sensor first and then assembling the whole instrument in the conventional calibration.
4. The invention has strong universality, and the upper jack-post, the lower jack-post and the standard polish rod can be arranged on a conventional loading platform to calibrate the load measuring instrument.
5. The device has the advantages of simple structure, low requirement on the processing precision of parts, lower cost and lower maintenance cost than the conventional micro-deformation calibration device.
6. The standard polish rod uses 25mm alloy steel for the oil pumping unit, the total length is 146mm, one end of the standard polish rod is provided with threads M10-6e, the standard polish rod can be installed in a threaded hole in the center of the lower support pillar, and the threaded connection can prevent the calibration precision from being influenced by loading pressure deviation and prevent the polished rod of the stake from being out of balance under stress.
7. The device is calibrated in a (0-120) kN load range, 7 calibration points are calibrated at intervals of 20kN, the calibration coefficient is calculated through a regression equation set, and finally the calibration coefficient is used for calibrating the load measuring instrument.
8. And the calibration software in the computer automatically and synchronously acquires the load value of the loading platform and the micro-deformation measurement value of the load measuring instrument in real time, and automatically finishes calibration, coefficient calculation and verification.
The calibration method and the device of the non-bearing load measuring instrument are suitable for calibration and verification of the non-bearing load measuring instrument used in the current oil field.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a dimensional diagram of a standard polished rod structure used in the present invention.
The labels in the figures are: 1-load loading platform, 2-load measuring instrument, 3-upper top column, 4-lower top column, 5-standard polished rod, 6-communication cable, 7-wireless transceiver module and 8-computer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention relates to a calibration method of a non-bearing load measuring instrument, which automatically loads and unloads a standard polished rod within the range of 0-120 kN at intervals of 20kN through calibration software in a computer, calibrates the load measuring instrument installed on the standard polished rod, obtains a calibration coefficient through calculation of a regression equation set arranged in the computer, and calibrates the load measuring instrument by adopting the calibration coefficient; therefore, the load value of the loading platform and the micro-deformation measurement value of the load measuring instrument can be automatically and synchronously acquired in real time through the computer, and calibration, coefficient calculation and verification are automatically completed.
As shown in fig. 1, the specific calibration steps of the method are as follows:
step one, vertically placing a standard polished rod 5 provided with a load measuring instrument 2 between a lower top column 4 and an upper top column 3 of a loading platform 1; starting the marking software on the computer 8, controlling the lower ejection column 4 of the loading platform 1 to move upwards through the marking software, enabling the top end of the standard polished rod 5 to be in contact with the bottom surface of the upper ejection column 3, and adjusting the load measuring instrument 2 to 0kN serving as a reference value X0；
Step two, the lower top pillar 4 of the loading platform 1 is controlled by the calibration software to continuously apply load to the standard polished rod 5, and the measured values X of the load measuring instrument 2 are respectively recorded at a 20kN calibration point, a 40kN calibration point, a 60kN calibration point, an 80kN calibration point, a 100kN calibration point and a 120kN calibration pointLoading 20、XLoading 40、XLoading 60、XLoading 80、XLoading 100、XLoading 120；
Step three, the lower top pillar 4 of the loading platform 1 is controlled to unload the standard polished rod 5 through the calibration software, and the measured values X of the load measuring instrument 2 are respectively recorded at a 100kN calibration point, an 80kN calibration point, a 60kN calibration point, a 40kN calibration point, a 20kN calibration point and a 0kN calibration pointUnloading 100、XUnloading 80、XUnloading 60、XUnloading 40、XUnloading 20、XUnload 0；
Step four, taking the measured value of each calibration point in the loading and unloading process to calculate the average measured value X of each calibration point20、X40、X60、X80、X400、X120(ii) a And calculating the calibration coefficient of each calibration point by a regression equation setA、B、C；
The regression equation set is as follows:
F0=A+BX0+CX0 2
F20=A+BX20+CX20 2
F40=A+BX40+CX40 2
F60=A+BX60+CX60 2
F80=A+BX80+CX80 2
F100=A+BX100+CX100 2
F120=A+BX120+CX120 2
in the formula: f-is the standard load of different calibration points;
x-is the average measurement of different calibration points;
A. b, C-is a calibration coefficient calculated according to a regression equation set;
step five, after the calibration coefficient A, B, C is determined, substituting the actually measured load value X of the load measuring instrument into the equation F = A + BX + CX2Calculating the actual load value F, and then comparing the actual load value F with the standard load F0And calculating the verification precision by the difference obtained by subtracting.
The device used in the method comprises a loading platform 1 and a load measuring instrument 2 as shown in fig. 1 and 2; an upper support pillar 3 and a lower support pillar 4 are arranged on the loading platform 1; the loading platform 1 is connected with a computer 8 through a communication cable 6, and the computer 8 is connected with a wireless transceiving module 7; the load measuring instrument 2 is arranged in the middle of a standard polished rod 5 used for calibrating the loading platform 1; the load measuring instrument 2 adopts a non-load bearing type load measuring instrument in the prior art; the computer 8 is internally provided with marking software which can be compiled according to the use requirement by a conventional method or can be directly made into the existing marking software finished product; the standard polish rod 5 is made into round steel with the diameter phi of 25mm, the total length of the round steel is 146mm, and one end of the standard polish rod 5 is made into a thread M10-6e capable of being installed in a central threaded hole of the lower support pillar 4, so that the standard polish rod 5 can be in threaded connection with the lower support pillar 4.
When the standard polished rod 5 used for the calibration load measuring instrument 2 is manufactured, the standard polished rod 5 is preferably manufactured by adopting the structure and the size as shown in fig. 2, a 25mm alloy steel part used for a pumping unit is adopted, the total length of the standard polished rod 5 is 146mm, M10-6e threads are machined at one end of the standard polished rod 5, the standard polished rod 5 can be installed in a threaded hole in the center of the lower ejection column 4 through the M10-6e threads, and the threaded connection can prevent the calibration precision from being influenced by loading pressure deviation and prevent the standard polished rod 5 from being pulled out due to unbalanced stress.
The load measuring instrument 2 is used for monitoring the diameter change of the standard polished rod 5, is arranged in the middle of the standard polished rod 5, and can continuously monitor the diameter change of the standard polished rod 5. The load measuring instrument 2 can be directly used by the existing load measuring instrument finished product.
Claims (6)
1. A calibration method of a non-bearing load measuring instrument is characterized in that: the method comprises the steps that standard polished rods are automatically loaded and unloaded within the range of 0-120 kN at intervals of 20kN through standard inspection software in a computer, a load measuring instrument installed on the standard polished rods is calibrated, calibration coefficients are obtained through calculation of a regression equation set arranged in the computer, and then the load measuring instrument is calibrated through the calibration coefficients; therefore, the load value of the loading platform and the micro-deformation measurement value of the load measuring instrument can be automatically and synchronously acquired in real time through the computer, and calibration, coefficient calculation and verification are automatically completed.
2. The calibration method of the non-load bearing load measuring instrument according to claim 1, wherein: the method comprises the following specific calibration steps:
the method comprises the following steps that firstly, a standard polished rod (5) provided with a load measuring instrument (2) is vertically placed between a lower top column (4) and an upper top column (3) of a loading platform (1); starting the marking software on the computer (8), controlling the lower support pillar (4) of the loading platform (1) to move upwards through the marking software, enabling the top end of the standard polished rod (5) to be in contact with the bottom surface of the upper support pillar (3), and adjusting the load measuring instrument (2) to be 0kN serving as a reference value X0；
Step two, controlling the loading platform (1) through the marking softwareThe lower top pillar (4) continues to apply load to the standard polished rod (5), and the measured value X of the load measuring instrument (2) is recorded at a 20kN calibration point, a 40kN calibration point, a 60kN calibration point, an 80kN calibration point, a 100kN calibration point and a 120kN calibration point respectivelyLoading 20、XLoading 40、XLoading 60、XLoading 80、XLoading 100、XLoading 120；
Step three, the lower top pillar (4) of the loading platform (1) is controlled to unload the standard polished rod (5) through the calibration software, and the measured values X of the load measuring instrument (2) are recorded at a 100kN calibration point, an 80kN calibration point, a 60kN calibration point, a 40kN calibration point, a 20kN calibration point and a 0kN calibration point respectivelyUnloading 100、XUnloading 80、XUnloading 60、XUnloading 40、XUnloading 20、XUnload 0；
Step four, taking the measured value of each calibration point in the loading and unloading process to calculate the average measured value X of each calibration point20、X40、X60、X80、X400、X120(ii) a Calculating the calibration coefficient A, B, C of each calibration point through a regression equation set;
the set of regression equations set in the computer is as follows:
F0=A+BX0+CX0 2
F20=A+BX20+CX20 2
F40=A+BX40+CX40 2
F60=A+BX60+CX60 2
F80=A+BX80+CX80 2
F100=A+BX100+CX100 2
F120=A+BX120+CX120 2
in the formula: f-is the standard load of different calibration points;
x-is the average measurement of different calibration points;
A. b, C-is a calibration coefficient calculated according to a regression equation set;
and step five, after the calibration coefficient A, B, C is determined, substituting the actual load value X of the load measuring instrument into the equation F = A + BX + CX2 to calculate an actual load value F, and subtracting the standard load F0 from the actual load value F to obtain a difference value to calculate the calibration precision.
3. The apparatus used in the calibration method of the non-load-bearing load measuring instrument according to claim 1 or 2, wherein: the device comprises a loading platform (1) and a load measuring instrument (2); an upper support pillar (3) and a lower support pillar (4) are arranged on the loading platform (1); the loading platform (1) is connected with a computer (8) through a communication cable (6), and the computer (8) is connected with a wireless transceiver module (7); the load measuring instrument (2) is arranged in the middle of a standard polished rod (5) used for calibrating the loading platform (1).
4. The apparatus of claim 3, wherein: the load measuring instrument (2) is a non-load bearing type load measuring instrument.
5. The apparatus of claim 3, wherein: and standard inspection software is installed in the computer (8).
6. The apparatus of claim 3, wherein: the standard polished rod (5) is round steel with the diameter phi of 25mm, the total length of the standard polished rod is 146mm, the standard polished rod (5) is in threaded connection with the lower support pillar (4), and one end of the standard polished rod (5) is provided with threads M10-6e capable of being installed in a central threaded hole of the lower support pillar (4).
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| CN115808310A (en) * | 2023-02-09 | 2023-03-17 | 哈尔滨科锐同创机模制造有限公司 | Test parameter calibration method and system applied to bearing test |
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| CN115808310A (en) * | 2023-02-09 | 2023-03-17 | 哈尔滨科锐同创机模制造有限公司 | Test parameter calibration method and system applied to bearing test |
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