Digital high-precision indicator diagram data acquisition device

Abstract

The invention discloses a digital high-precision indicator diagram data acquisition device, and belongs to an electronic indicator diagram technology of an oil field pumping unit in the field of oil production engineering. The device utilizes an angle sensor to obtain a rotation angle of a walking beam, and then utilizes a displacement sensor to obtain relative displacement of a polish rod and a beam hanger; and a processor carries out calculation by using the rotation angle and the pulse number of the relative displacement and completes acquisition of pumping unit indicator diagram data, andan indicator diagram is displayed by a man-machine screen or remotely transmitted to a network to draw the indicator diagram. According to the digital high-precision indicator diagram data acquisitiondevice, a novel indicator diagram data acquisition mode is adopted, aiming at the mechanical structure and the working principle of the beam-pumping unit, the angle sensor is used for acquiring the swing angle of the walking beam and calculating the stroke, the displacement sensor is used for acquiring the displacement data of the polish rod and calculating the load, and the stroke and the load are both direct digital values, outdoor temperature difference interference and impact interference which cannot be overcome by an existing sensor are solved, and the device has the advantages of beinglong in service life, low in cost, high in anti-interference performance and the like.

Description

technical field [0001] The invention belongs to the electronic dynamometer technology of an oil field pumping unit in the field of oil production engineering, and in particular relates to a digital high-precision dynamometer diagram data acquisition device. Background technique [0002] The indicator diagram can reflect the working condition of the deep well pump. It is measured by a special instrument and drawn on the coordinate diagram. The area enclosed by the closed line segment represents the work done by the pumping unit during a reciprocating motion of the donkey head. drawing. Analyzing and explaining the dynamometer diagram is a major means to directly understand the working condition of the deep well pump. Not only can all abnormal phenomena in the work of the deep well pump be reflected intuitively on the dynamometer diagram, but also can be combined with relevant data, To analyze and judge whether the working system of the oil well is reasonable, whether the pum...

AI Technical Summary

Problems solved by technology

This type of sensor has the following disadvantages: 1) It is easily affected by external interference, and vibration has a significant impact on piezoelectric sensors, especially in small pressure measurements

2) The influence of temperature is obvious, the sensitivity will decrease with the increase of temperature, and thermal expansion will occur when the temperature rises, resulting in a change of the pre-tightening force of the crystal, so that the output of the sensor will drift

[0006] At present, the most advanced load-displacement integrated machine dynamometer sensor used on oil field pumping units uses piezoelectric ceramic pressure sensors, and its disadvantages are: 1) The principle of displacement measurement is to calculate the pressure of a known object based on F=ma Acceleration, the acceleration is the displacement after the second integration, the measurement of the displacement will have a large error when the stroke frequency of the pumping unit is less than 2 times / min; 2) The piezoelectric sensor cannot be used in the static measurement, because The charge after being subjected to external force can only be preserved when the circuit has infinite input impedance, but this is not the case in fact, so the piezoelectric sensor can only be used in dynamic measurement, while the pumping unit The top dead center and bottom dead center of the donkey head are in the instantaneous static state during the movement, and the measured load and displacement errors are very large at this time; Restricted by factors, the number of collection points of vertical and horizontal coordinates of the work map graph can only be between 220 and 280 points respectively, and the precision is not high. In the calculation of fluid production calculation, the measurement accuracy is generally only between 70 and 80%. It takes 7 to 10 minutes to produce a pair of dynamometer diagrams, and the real-time performance is relatively poor.

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