Mechanical hold down with internal strainer

A system for holding down a downhole rod pump and straining pump fluids, the system comprising:

• a seat nipple, the seat nipple comprising an upper surface and a lower engagement feature;
• a mandrel comprising:
• a top edge surface and an external threaded region;
• an interior bore extending longitudinally through the mandrel;
• and
• a tapered section positioned in engagement with the seat nipple;
• a top bushing comprising:
• a bushing interior bore extending longitudinally through the bushing;
• an upper external threaded section;
• and
• a lower internal threaded section, the lower internal threaded section being threadedly engaged with the external threaded region of mandrel;
• wherein the top edge surface of the mandrel is positioned within an interior space defined by the engagement of the mandrel and the bushing;
• an internal strainer assembly comprising:
• a strainer bushing positioned within the interior space defined by the engagement of the mandrel and the bushing, the strainer bushing having a lower edge surface, the straining bushing lower edge surface resting on the top surface of the mandrel;
• and
• a strainer affixed to the strainer bushing and extending longitudinally through the interior bore of the mandrel.

A mechanical hold down for engaging with a seat nipple, the mechanical hold down comprising:

• a mandrel comprising:
• a top edge surface and an external threaded region;
• an interior bore extending longitudinally through the mandrel;
• and
• a tapered section configured to engage a seat nipple;
• a top bushing comprising:
• a bushing interior bore extending longitudinally through the bushing;
• an upper external threaded section;
• an upper internal surface defining a first taper;
• and
• a lower internal threaded section, the lower internal threaded section being threadedly engaged with the external threaded region of mandrel;
• and
• an internal strainer assembly comprising:
• an edge surface resting on the top surface of the mandrel;
• and
• an upper edge surface defining a second taper, wherein the second taper is adapted to align with a strainer bushing positioned between the mandrel and the bushing, the strainer bushing comprising:
• a lower first taper;
• and
• a strainer affixed to the strainer bushing and extending longitudinally through at least a portion of the interior bore of the mandrel.