Two expert systems distinguish between acceptable and abnormal operations; both utilize an established pattern recognition algorithm. Surface dynamometer cards for individual wells are used to check for normal operation. Surface cards can also provide feedback to pumpoff controllers and to variable speed drives. Calculated pump dynamometer cards are used to diagnose malfunctioning wells. These expert programs improve productivity by focusing attention on malfunctioning wells. The analysis could be part of a centralized operation with remote data acquisition and an automatic daily computer printout identifying malfunctions by well. Library maintenance involves communication between the day-to-day users, the repair shop and the expert.

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