Indicator diagram conversion optimization method based on Fourier series

Abstract

The invention relates to the field of oil production engineering, in particular to an indicator diagram conversion optimization method based on Fourier series. The method comprises the following steps: obtaining an effective power value of the pumping unit by obtaining centroid velocities and electrical parameters of a crank, a connecting rod and a walking beam, and establishing a mathematical model for effective power optimization; obtaining fourier coefficients of construction variables through the model, performing optimization and obtaining an optimized suspension center load; and constructing an indicator diagram according to the optimized suspension center load and suspension center displacement. The method effectively solves the problem that upper and lower dead points of the conversion indicator diagram are not converged, greatly reduces the oil well working condition diagnosis and metering cost, and promotes the construction of the oil field low-cost Internet of Things based on electrical parameters.

Description

technical field [0001] The invention relates to the field of oil production engineering, in particular to a Fourier series-based work diagram conversion optimization method. Background technique [0002] At present, the dynamometer diagram analysis method has been widely used in major domestic oil fields, but there are problems such as high cost and poor real-time performance in the dynamometer diagram measurement. However, the electric power map data is easy to obtain, has the characteristics of low cost and is suitable for long-term continuous monitoring, but there are still some deficiencies in the existing electric power map transfer technology. If it can be effectively optimized and improved, this method will be widely used in oil fields. The production site has been well applied in engineering practice, making it possible to build large-scale and low-cost Internet of Things in oil fields. [0003] In the process of converting the existing electric power diagram to the...

AI Technical Summary

Problems solved by technology

In this method, the minimum loss function before and after the effective power change is taken as the effective power optimization objective function, and considering the constraints such as the constant total work and the effective power being zero at the upper and lower dead centers, an effective power optimization model and load simulation based on Fourier series are established. Combined with the optimization model, the effective conversion of the measured electric power diagram to the electric power diagram is realized, and the problem of non-convergence near the upper and lower dead points of the converted indicator diagram is effectively solved

Images