Specifications

1.API Spec 11B standard
2.Also be referred to as "insert pump"

Function:

Rod pump is also referred to as "insert pump" as its plunger is attached took and moves up and down with the sucker rod string .It is suitable for reducing the time of workover for deep well as it is not necessary to pull all the tubing out of the well hole when checking the pump, which makes the operation quicker and the service life of tubing longer. The rod pump is in a state of "free hanging", so it is suitable for deviated wells.

 

According to seating mode, the rod pump can be divided into two types: cup hold-down and mechanical hold-down.

According to anchored position, the pump can be divided into two type: hold-down pumps and bottom hold-down pumps which include stationary barrel and traveling barrel types

 

Stationary Heavy Wall Barrel Top Anchor Mech

 

1.  Hold-down Rod Pump RHAM & RHAC 

Stationary Heavy Wall Top Anchor Cup Hold-down Rod Pump RHAC
The top anchored pump with stationary barrel is suitable for sand production well since the fluid discharged from the guide cage washes away the sand between tubing and the top of the pump. But, the pump barrel is more subject to inside pressure and tensile load caused by the fluid column, and the plunger clearance will intend to increase during upstroke so the top anchored pumps are not recommended in deep wells.

 

2.  Stationary Heavy Wall Barrel, Bottom Anchor, Cup Seating, Rod pumps RHBC&RHBM

Stationary Heavy Wall Barrel, Bottom Anchor, Mech, Seating, Rod pumps RHBM

It is suitable for deep well since the barrel only bears pressure from outside and does not bear tensile load and its clearance change is small. But it is not recommended for extreme sandy conditions since there is no circulation of the well fluid around the outside of the barrel so pump may become stuck in the tubing by packed sand.

 

3.   Traveling Barrel Bottom Anchor Rod Pump(Insert Pump)RHTC, RHTM

In this pump, the barrel is attach to, and moves up and down with the sucker rod string. The plunger is connected to the hold down by a hollow pull tube and remains stationary. The traveling barrel pump is recommended for sandy wells since the movement of the traveling barrel keeps the fluid in motion and sand washed down, which minimizes the possibility of and setting around the pump and sticking it. The traveling barrel is particularly recommended for wells being pumped intermittently since the ball in the to cage will seat when the well is shut down, sand cannot settle inside of the pump, The traveling barrel pump is not suitable for gassy wells and viscous fluid wells. It is not recommended for the pumps with long stroke in deep wells, either.