Multi-fault diagnosing method for oil well with sucker rod pump based on indicator diagram

Abstract

The invention discloses a multi-fault diagnosing method for an oil well with a sucker rod pump based on an indicator diagram and relates to the technical field of oil production. The multi-fault diagnose method comprises the following steps of transforming a collected ground surface indicator diagram into a down hole pump indicator diagram; setting up a standard feature library of every fault type according to existing indicator diagram data in oilfield production; adopting interval data to express an eigenvalue of every invariant curve moment eigenvector; then calculating the relevancy between a collected sample and every fault type in the standard feature library; judging the possible fault types of the collected sample, and thus improving the credibility of fault diagnosing; at last, conducting multi-fault combination on the possible fault types of the collected sample; and deciding the possible multi-fault type by calculating an F index value of each combination. The multi-fault diagnosing method is simple in principle, small in calculating complexity, easy to achieve, and high in accuracy degree of diagnosing.

Description

technical field [0001] The invention relates to the technical field of petroleum production, in particular to a method for diagnosing multiple faults of rod pumped oil wells based on a dynamometer diagram. Background technique [0002] Rod pump wells are the main production method in domestic and foreign oilfields. To achieve continuous, stable and efficient operation is an important measure to improve oil well production efficiency, reduce production costs and reduce production safety hazards. Because the oil pump works thousands of meters underground, the working environment is harsh, making the downhole working conditions extremely complicated, and failures occur from time to time, ranging from shutting down the well to affecting production, and causing safety accidents in severe cases. Accurate fault diagnosis of the condition is a problem that oilfield enterprises have been concerned about. [0003] With the continuous development of computer information technology, co...

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Problems solved by technology

[0004] However, the existing diagnostic methods generally only consider the occurrence of one fault condition, and the simultaneous occurrence of multiple faults in actual production is common. Therefore, when multiple fault conditions occur simultaneously in the mine, the current Some methods cannot make accurate analysis to provide effective technical guidance

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