Rod (Insert)pumps are inserted inside the tubing and run as an assembled unit with the sucker rods. This type pump is anchored in a cup type or mechanical type seating nipple which is run as a part of the tubing string. A rod pump is removed from the tubing when the sucker rod string is pulled.
A rod pump is necessarily smaller in diameter than a tubing pump and therefore of a smaller capacity for a given tubing size.
Rod pumps have these main advantages:
- Built with bottom or top hold downs
- Available with 3 cup seating assembly or mechanical hold down
- Precision barrels up to 40'
- Barrels available in harden and honed, brass, and NiCarb
They come in two differents types:
The "RH" Rod Heavy Wall pump is an API all precision metal pump:
- For Deeper wells
- O.D. threads for a stronger connection
- Extension available on both ends, and proper spacing will allow it to be a stroke through pump
- the "RH" barrel has a wall thickness of 3/16"
The "RW" Rod Thin Wall pump is an API all precision metal pump
- For shallow wells
- The "RW" barrel has a wall thickness of 1/8"
Pumps are available in different lengths and material to address the different downhole challenges.