Don-Nan RWT API Insert Pumps

Accumulate sand and scale around the hold-down without sticking the pump

Recommended for shallow operating depths, RWT API insert pumps are thin-walled, traveling barrel, bottom hold-down pumps recognized by API as a standard design. Whereas the plunger assembly is attached to the hold-down where it becomes stationary, the barrel assembly is the traveling portion that moves with the sucker rod string.

Because the barrel assembly moves, sand and scale can accumulate around the hold-down without sticking the pump; upon restarting operation, all settled material will be dispersed in the fluid. The exit point for fluid is through an open three-wing cage, which prevents any solid material from reentering the pump on well shutdown and lengthens the run life of internal components.

The seating options on this pump include mechanical or cup types suitable for high temperatures, and mechanical types for simplified well maintenance. A mechanical hold-down does not require repair unless major damage has occurred, whereas cups should be replaced every time the pump is unset. Both hold-down types follow the same procedure of setting and unsetting by placing the weight of the sucker rods down on the pump or lifting up.