H-F John Martin Composition Ring Plunger The H-F John Martin Composition Ring Plunger is a soft-packed plunger with rings that swell in downhole fluids to the appropriate tightness in the barrel. These rings are selected for use based on the gravity of the crude oil being produced and bottom hole temperature. They are intended for use when metal plungers are unable to produce the well due to sticking or galling when aggressive sands or large percentages of particulates are being pumped. |
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