The plunger is equipped with a sand scraping assembly to clean the sand on inner wall of the barrel, prevent the pump from sand stuck.

Sand scraping sucker rod well pump are typically used in sandy applications and offer the following advantages:

• The movement of the traveling barrel keeps the fluid in motion and the sand washed clear—almost down to the pump seating nipple. This advantage minimizes the possibility of sand settling around the pump and seizing it in the tubing.

• Traveling-barrel pumps are especially suitable for wells that are pumped intermittently.

Sand cannot settle inside the pump because the traveling valve at the top of the pump will close when the well is shut down.

This prevents sand from settling inside the pump—a condition that could cause the plunger to stick or prevent the standing valve from opening when the well resumes pumping.

• Both the traveling and standing valves on traveling-barrel pumps have open-type cages, which have a more rugged construction and provide more fluid passage than closed-type cages.

• The externally and internally equalized pressure on the traveling or stationary barrel provides bottom-anchor pumps with a greater resistance to bursting than top-anchor pumps.

Traveling-barrel, bottom-anchor pumps have the following limitations:

• Traveling-barrel pumps are at a disadvantage in wells with a low-static fluid level. To enter the pumping chamber, the fluid must rise through the pull tube and plunger and then pass through the standing valve.

• The standing valve is located on top of the plunger and is smaller in diameter than the traveling valve and, therefore, offers more fluid restriction than the larger standing valve of stationary-barrel pumps.

This promotes gas breakout and could cause gas interference in the pump.

• Longer lengths of traveling-barrel pumps should not be run in deep wells.

When the standing valve (in the plunger top cage) is closed, the hydrostatic column load is transmitted by the plunger through the pull tube and holddown into the pump seating nipple.

In a deep well, this load will be sufficient to put a bow in a long pull tube, thus setting up a drag between the pull plug and the pull tube.

• Traveling-barrel pumps are not usually run in slant holes or in wells that are deviated at the pump seating nipple.

Either condition will cause excessive wear on the pump barrel and will detract from the travel of the pump and, therefore, reduce the displacement.

Features:

A sand scraping device is added to the plunger to close the inner wall of the pump barrel to scrape sand, and the oil sand is carried out of the pump barrel through the liquid flow:

1. Prevent the phenomenon of sand sticking to the plunger.
2. Reduce the wear of the plunger pump barrel and prolong the service life of the oil well pump.

Application:

1. Adapt to the production of thin oil wells that are not buried in sand.
2. The gas oil is relatively high, and the oil wells prone to gas lock are not suitable use this pump.
3. The oil well contains sand ≤ 2%.