CN201909692U - Wireless self-calibration indicator diagram instrument for oil pumping unit in oilwell - Google Patents

Abstract

The utility model relates to the field of oil well pumping unit power chart measurement, in particular to a wireless self-calibrating oil well pumping unit power chart instrument. Its characteristic is: use the acceleration sensor to measure the acceleration of the suspension point, obtain the displacement through the second integration of the acceleration, and obtain the stroke and stroke times at the same time. Using the wire displacement sensor as the calibration source, the stroke is calibrated, and the acceleration is calibrated inversely. After calibration, the measurement accuracy can meet the requirements of use. Using the utility model, after performing self-calibration on the spot, higher measurement accuracy can be obtained under various working conditions, and the device can be used continuously for a long time. Moreover, the device has low price and can be widely used in oil fields.

Description

Wireless self-calibration oil well pumping unit dynamometer

technical field

The utility model relates to the field of oil well pumping unit power chart measurement, in particular to a wireless self-calibrating oil well pumping unit power chart instrument.

Background technique

When the suspension point of the pumping unit performs reciprocating motion between the upper and lower dead points, the suspension point moves upward from the bottom dead point to the top dead point, and the downward movement from the top dead point to the bottom dead point. According to the up and down displacement and load, the displacement is The horizontal axis and the load as the vertical axis can draw the pumping unit power diagram.

When the beam pumping unit is working, in different areas, the oil pump is hundreds of meters to several thousand meters underground, and the ground cannot directly understand the working condition of the oil pump. Usually, it is necessary to measure the work diagram of the pumping unit to indirectly understand the working condition of the oil pump , to provide a basis for oilfield maintenance personnel to make maintenance decisions, and at the same time, it is necessary to measure the stroke and stroke times of the pumping unit.

At present, oilfields generally use wired dynamometers to measure dynamometers. Its working principle is: use the wire displacement sensor to measure the displacement, and use the force sensor to measure the load. The core of the pull wire displacement sensor is a bobbin with automatic wire take-up function. When in use, the bobbin is installed on the suspension point of the smoke machine, and the thread end is fixed on the ground. The number of rotations can measure the displacement of the suspension point, and its measurement accuracy is high. Load measurement uses electrical resistance strain gauges. Since the service life of the spool is about 100,000 times, and the suspension point of the pumping unit is different according to the model, it goes back and forth 5,000-10,000 times a day, so this kind of dynamometer cannot be used continuously for a long time. Oilfields generally use one dynamometer to perform intermittent inspections on multiple oil wells. Due to the long inspection cycle, it is impossible to obtain real-time gong graphs of pumping units. Simultaneously, because the price of this dynamometer is relatively high, it is not easy to be widely used.

Contents of the invention

The purpose of the utility model is to provide a wireless self-calibration oil well pumping unit dynamometer with high measurement accuracy, long service life and low cost.

The technical solution for realizing the purpose of this utility model: a wireless self-calibration oil well pumping unit dynamometer, including a processor, an acceleration sensor and a load sensor connected to the processor; the acceleration sensor is used to collect acceleration data; the load sensor is used to collect Load data; the processor is used to process acceleration data and load data to obtain work diagrams.

As described above, the wireless self-calibration oil well pumping unit dynamometer, the processor is implemented by a single-chip microcomputer, and the single-chip microcomputer includes a real-time clock, a flash memory unit, a timer and an analog-to-digital conversion unit;

According to the wireless self-calibrating oil well pumping unit dynamometer as described above, the acceleration sensor includes an analog-to-digital conversion unit, a digital processing unit and an output unit;

According to the above-mentioned wireless self-calibrating oil well pumping unit dynamometer, the load sensor includes a strain gauge and an operational amplifier unit.

The effect of the utility model is that: after on-site calibration of the acceleration displacement sensor of the dynamometer by the external pull wire displacement sensor, high-precision measurement of the dynamometer of the pumping unit can be realized. The device only needs a processor, an acceleration sensor and The load sensor can realize continuous measurement for a long time and reduce the measurement cost.

Description of drawings

Fig. 1 is a structural schematic diagram of a wireless self-calibrating oil well pumping unit dynamometer provided by the utility model.

In the figure: 1. Processor; 2. Acceleration sensor; 3. Load sensor.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in FIG. 1 , a wireless self-calibrating oil well pumping unit dynamometer includes a processor 1 , an acceleration sensor 2 and a load sensor 3 connected to the processor 1 . The processor 1 is realized by a single-chip microcomputer, and the single-chip microcomputer includes a real-time clock, a flash memory unit, a timer and an analog-to-digital conversion unit. The acceleration sensor 2 includes an analog-to-digital conversion unit, a digital processing unit and an output unit. The load sensor 3 includes strain gauges and operational amplifiers. The pull wire displacement sensor is connected with the wireless self-calibrating oil well pumping unit dynamometer when calibration is required, and removed after the calibration is completed. The stay wire displacement sensor can adopt the prior art.

For specific applications, select the C8051F430 single-chip microcomputer, the ADIS16021 acceleration sensor, the general-purpose components for the load sensor, and the purchased parts for the pull-wire displacement sensor.

The utility model work process is as follows:

In actual use, it is generally set to measure once an hour, and sleep at other times. This function is completed by the real-time clock (RTC) in the single-chip microcomputer; when starting to measure, set a reasonable sampling period to ensure that each punch is sampled more than 200 times. Less than 300 times, this function is completed by the timer in the single-chip microcomputer; the single-chip microcomputer reads the acceleration data of the acceleration sensor through the SPI interface, and at the same time samples the voltage value of the load sensor through the internal A/D, and calculates the load. After continuous sampling for 1000 times, stop sampling to obtain data samples. Carry out numerical analysis on the acceleration data in the data sample, find out the position of the acceleration in the data sample when the acceleration is at the upper and lower dead centers, and obtain an effective acceleration sample. The length of the acceleration sample is multiplied by the sampling period to obtain the number of strokes, and the quadratic numerical integration of the acceleration sample can be used to obtain the displacement and stroke. In general, the displacement and stroke errors are large and cannot be used directly. The stroke is calibrated using the calibration data stored in the FLASH, and then the acceleration data is calibrated in reverse, and then the acceleration sample is integrated twice to obtain accurate displacement and stroke. According to the position of the acceleration sample in the data sample, the load sample can be obtained. The data of the load sample corresponds to the displacement data one by one. According to the displacement and load data, the work diagram can be obtained.

Calibration process: When the dynamometer is installed for the first time or needs to be calibrated, connect the cable displacement sensor to the processor, the dynamometer can automatically detect the existence of the external cable displacement sensor, start self-test, and the dynamometer reads the cable displacement through the frequency interface sensor data. After the self-inspection is over, remove the external cable displacement sensor, and the dynamometer will automatically record the stroke measured by the external sensor and store it permanently until the next self-inspection.

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. If these modifications and variations fall within the scope of the claims of the utility model and their equivalent technologies, the utility model is also intended to include these modifications and variations.

Claims (4)

1. a wireless self-calibration oil well pumping unit dynamometer, is characterized in that: comprise processor (1), the acceleration sensor (2) that is connected with processor (1) and load sensor (3); Acceleration sensor (2) ) is used to collect acceleration data; the load sensor (3) is used to collect load data; the processor (1) is used to process the acceleration data and the load data to obtain a power map. 2. according to a kind of wireless self-calibration oil well pumping unit gong graph instrument according to claim 1, it is characterized in that: described processor (1) adopts single-chip microcomputer to realize, and described single-chip microcomputer comprises real-time clock, flash memory unit, timing converter and analog-to-digital conversion unit. 3. A wireless self-calibrating oil well pumping unit dynamometer according to claim 1, characterized in that: said acceleration sensor (2) comprises an analog-to-digital conversion unit, a digital processing unit and an output unit. 4. A wireless self-calibrating oil well pumping unit dynamometer according to claim 1, characterized in that: said load sensor (3) includes a strain gauge and an operational amplifier unit.

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