Method for measuring stroke period of pumping unit

Abstract

The invention provides a method for measuring a stroke period of an oil pumping unit, which comprises the following steps of: acquiring displacement data xi at intervals of preset time delta t, wherein i is greater than or equal to 0 and less than N, storing the acquired displacement data into an N-point buffer area B1, returning to zero when an address offset pointer P of the B1 overflows, when the offset pointer P overflows, calculating an average value of xi data of the N-point buffer area to obtain basic displacement sampling point data Xj, wherein j is greater than or equal to 0 and lessthan M, storing the basic displacement sampling point data Xj into an M-point annular buffer area B2, meanwhile, calculating a mean value Sj of all data in the annular buffer area B2, carrying out monotonicity judgment on the mean value Sj, recording a change time point T1, repeating the step S4 in a circulating manner, recording a next same-direction monotonicity change time point T2, and calculating the time difference between T2 and T1 of the stroke period of the oil pumping unit. The method has great reliability and accuracy for stroke period metering of the displacement curve of the superposed noise output by the wired angular displacement sensor, and the whole method is simple and efficient to implement.

Description

technical field [0001] The invention relates to the technical field of measurement, in particular to a method for measuring the stroke period of an oil pumping unit. Background technique [0002] The stroke cycle parameter of the pumping unit is very important to the collection of the dynamometer diagram, which is directly related to the integrity of the fixed sampling point data of the dynamometer diagram. If the stroke period is too large, some data of the indicator diagram will overlap, and if it is too small, the data of the indicator diagram will not be closed. Contents of the invention [0003] The aim of the present invention is to solve at least one of said technical drawbacks. [0004] For this reason, the object of the present invention is to propose a kind of measuring method of pumping unit stroke period. [0005] In order to achieve the above object, an embodiment of the present invention provides a method for measuring the stroke cycle of a pumping unit, co...

AI Technical Summary

Problems solved by technology

If the stroke cycle is too large, some data in the dynamometer diagram will overlap; if it is too small, the data in the dynamometer diagram will not be closed.

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