Downhole sucker-rod pumps: Difference between revisions

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Tight clearances (less than 0.003 in.) may cause producing problems, whereas loose clearances (greater than 0.008 in.) may result in excessive leakage by the pump. Good field-pump records are essential to make good pump recommendations.
Tight clearances (less than 0.003 in.) may cause producing problems, whereas loose clearances (greater than 0.008 in.) may result in excessive leakage by the pump. Good field-pump records are essential to make good pump recommendations.
Slippage in sucker-rod pumps takes two forms: static and dynamic slippage.
Slippage in sucker-rod pumps takes two forms: static and dynamic slippage.
• Static slippage is the dominant factor and occurs only during the upstroke of the pump; it is caused by the pressure differential across the plunger-barrel fit. The high hydrostatic pressure present in the tubing string, acting on top of the plunger with the traveling valve closed, forces liquid to slip past the plunger into the pump chamber between the traveling and the standing valves.
• Static slippage is the dominant factor and occurs only during the upstroke of the pump; it is caused by the pressure differential across the plunger-barrel fit. The high hydrostatic pressure present in the tubing string, acting on top of the plunger with the traveling valve closed, forces liquid to slip past the plunger into the pump chamber between the traveling and the standing valves.
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