Sanjack has developed the downhole pumps with various processes of bronzing, nitriding, chrome plating, tungsten plating for special well conditions.

The Type B Rod Pump has the following characteristics.

The locking device is located at the bottom, which has the characteristics that the pump barrel will not be elongated due to the action of the liquid column, only subject to external pressure, and the gap will not increase.

Therefore, it is suitable for use in deep wells; the pump can swing around the pivot point of the bottom locking device and can also be used in inclined wells.

Application: deep wells with viscosity below 400mPa-s

Not applicable: It is easy to deposit sand particles in the annular space of the fixed support sleeve and the bottom locking device, which makes the pump operation difficult, and should not be used in the sand-containing well; the bottom is fixed, the pump barrel swings greatly during operation, and the valve stem and the guide sleeve are intensified.

Wear is not suitable for long stroke pumps.

All-metal, heavy-wall, stationary-barrel, bottom-anchor RHB rod pumps are ideal for deep wells with severe pumping conditions.

RHB tubing pump

The RHBC model features a cup seating assembly.

The RHBM model features a metal seal that can be re-seated several times without replacement.

The RHBC and RHBM pumps are recommended for the following applications:

• Wells with low static-fluid levels
• Deep wells
• Gaseous wells (when pump is run in conjunction with a good oil-gas separator or
gas anchor)
• Wells that might pound fluid

These pumps are not designed to run in sandy wells but can be modified for such duty, using a top-seal assembly or a bottom discharge valve.

The stationary-barrel design is superior to traveling-barrel versions for low fluid levels because the fluid to be pumped has only to pass the larger standing valve located immediately above the shoe.

This design maximizes recovery and minimizes the tendency to foam.

insert pumps are heavy-walled，stationary barrel, bottom hold down pumps recognized

These pumps are recommended for depths of 8,000ft or greater when there is little chance of sand accumulation.

If sand is an issue, nonstandard accessories such as a top seal can be used to prevent a stuck pump.

These pumps can also be modified for use as a stoke through pump to release sand and other material.

To minimize damage to the plunger and barrel, a grooved-body plunger is often used to catch and carry the sand away from those components.

Seating options on this pump include mechanical or cup types suitable for high temperatures and mechanical types to simplify 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 by placing the weight of sucker rods down on the pump and unsetting by lifting them up.