SPE Petroleum Engineering Certification Exam

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An operator analyzes a downhole dynamometer card from a sucker rod pump and observes a sharp drop on the downstroke that occurs before the plunger reaches the bottom of its stroke, followed by a sharp impact line. What is the most likely cause of this 'fluid pound' signature?

The pump's displacement capacity is greater than the well's inflow, causing incomplete pump fillage. The tubing anchor has failed, allowing the tubing to move with the rod string. The traveling valve is leaking, allowing fluid to slip past during the upstroke. The standing valve is completely plugged with scale or debris.

Correct Answer:

The pump's displacement capacity is greater than the well's inflow, causing incomplete pump fillage.

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