Method and device for judging optimal times of stroke of pumping unit

Abstract

The invention discloses a method and a device for judging optimal the time of stroke of a pumping unit. The method comprises the following steps of: obtaining a current load displacement indicator diagram according to data of load and displacement sensors; changing the time of stroke, re-collecting the load displacement data to obtain the changed load displacement indicator diagram after the changing of the time of stroke; calculating relative liquid yield according to the ground indicator diagram before and after the changing of the time of stroke, judging the variation situation of the ratio of; and continuously running the programs until the minimal time of stroke is obtained under the maximal daily liquid yield, i.e., the optimal time of stroke is obtained. The device mainly comprises the load sensor, the angular displacement sensor, an RTU (remote terminal unit), a frequency changer, and on the like. Due to the fact that the optimal time of stroke judging program adopts the relative variation value of the daily liquid yield instead of the absolute value of the daily liquid yield, so the program is low in computing amount and small in occupied internal memory, and is capable of directly running on the RTU, further, the pumping unit can finish the data collection, computation and control independently by self without depending on the computation and the control of a host computer, and the system is ensured to run more reliably.

Description

technical field [0001] The invention relates to the technical field of automatic control of oil pumping unit power diagram measurement and optimal stroke determination, in particular to a method and device for optimal stroke determination of a pumping unit. Background technique [0002] At present, the contradiction in the concentration of domestic oil fields is the large number of low-yielding oil wells. Under the combination of the existing oil production parameters of the pumping unit, air pumping phenomenon is common, the pump efficiency and system efficiency are low, and the power consumption per ton of liquid remains high. [0003] Over the years, in order to overcome the phenomenon of air pumping and improve pump efficiency and system efficiency, researchers have conducted in-depth research. The research shows that after the stroke of the pumping unit and the diameter of the oil well pump are selected, the main factor affecting the pump efficiency and system efficien...

AI Technical Summary

Problems solved by technology

However, in the actual implementation process, there is still the problem of poor system operation reliability, the main reason is that the microprocessor chip installed on the control unit of the pumping unit has limited performance and small capacity, which is not enough for operation and calculation. "Digital Analysis" software in order to obtain the daily fluid production of the oil well, and the daily fluid production of the oil well is a key parameter for a reasonable selection of stroke times. Therefore, the data obtained by a single pumping unit must be transmitted to the The upper computer performs calculations

However, the data transmission between multiple pumping units and the same upper computer cannot be uninterrupted and smooth under the condition of limited resource allocation in the oil field. In the case of intermittent data transmission, the program of selecting a reasonable stroke time will be forced to be interrupted , causing the closed-loop control program to fail to run

[0008] From the above analysis, it can be seen that the "special power map analysis" software of the pumping unit has a large amount of calculation, the chip capacity of the control unit of the pumping unit itself is small, and the computing power is insufficient, which are the key factors that make the reasonable stroke selection program of the pumping unit difficult to operate reliably

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