Don-Nan Oversized Cage | Schlumberger

Don-Nan Oversized Cage

High-efficiency cage for improved solids and gas flow-through

Reduce gas interference and increase pump efficiency

The oversized cage is a standing valve cage fitted directly to the hold-down mandrel and pump barrel. It enables fluid and particulates to travel through valves with less disturbance, reducing gas interference and increasing pump efficiency.

It has an enlarged body compared with the equivalent API cage. Although the outside diameter has been increased, it continues to meet tubing drift requirements. Increasing the outside diameter effectively increases the flow area inside the cage without a loss of strength.

When combined with an alternate-pattern ball and seat, the oversized cage allows fluid and particulates to travel through valves with less disturbance, resulting in reduced gas interference and increased pump efficiency during field testing.

The oversized cage is available in alloy steel, stainless steel, and MONEL.

Oversized Cage
API configuration (left) and Don-Nan oversized cage (right).
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