A self-adaptive stroke adjustment method for downhole linear motor oil well pump

Abstract

The invention provides a self-adaptive pump stroke adjusting method for an oil well pump of a underground linear motor. The method comprises the following steps that S1, the time T is taken as a period, in the first period T, pump strokes per minute of an oil extraction device is N0, the oil extraction device starts from the second cycle T, the pump strokes per minute of the oil extraction devicein each period T are all up-regulated by a certain amount, and the oil well is evacuated until an oil well is evacuated in the certain period T, when the oil well is evacuated, the pump strokes per minute of the oil extraction device in each period T is recorded as N1, and then the oil extraction device stops mining; S2, when the stop time of the oil extraction device reaches the T1, the oil extraction device is restarted, and the oil extraction device extracts oil with N1 pump strokes per minute, the time length T2 used for evacuating the oil well again is recorded, and then mining of the oilextraction device is stopped; S3, after the stop time of the oil extraction device reaches the T1 again, the oil extraction device is restarted, and the oil extraction device extracts oil with Nnew pump strokes per minute, wherein the Nnew is equal to N1T2 / (T1 + T2 ). The self-adaptive pump stroke adjusting method for the oil well pump of the underground linear motor has the beneficial effects ofsimple in process, high in precision and high in practicability.

Description

technical field [0001] The invention relates to the technical field of oil production in oilfields, in particular to a method for self-adaptive stroke adjustment of downhole linear motor oil well pumps. Background technique [0002] As an important part of digital oilfield construction, pumping unit stroke control is particularly important in the current situation of low-permeability oilfields. If the stroke frequency is too high, the oil well will be easily pumped out; if the stroke frequency is too low, oil production resources will be wasted. The pumping unit's automatic stroke control refers to the automatic adjustment of the pumping unit's operating frequency according to the fluid production of the oil well, so as to achieve the balance between the oil production and liquid supply capacity and improve the automation capability of the equipment. [0003] At present, most of the pumping units used in the oil field are beam pumping units. The beam pumping unit can realiz...

AI Technical Summary

Problems solved by technology

Among them, the electric power method and the dynamometer method have higher theoretical accuracy, but the process is complicated, and the dynamic liquid surface method has a simple process, but due to the difficulty and accuracy of real-time measurement of the dynamic liquid surface, the practicability is slightly poor.

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