Introduction
The Multi-phase pump was designed with several different well conditions in mind. It has proven itself in both foamy and gaseous fluid wells, as well as in viscous fluids. It eliminates the need for the tradition standing valve and cage, which increases the allowable inflow to the pump chamber. This virtually eliminates gas locking during the pumping cycle. The pump can also be designed to handle emulsions with sand.
Description
A travelling assembly is located at the top of the plunger and the positive seal ring standing valve assembly is located above the pump barrel. This assembly is located at the top of the pump which creates a crater effect at the pump inlet allowing inflow into the pump during the upstroke.
Composite valve seat materials are used for the standing valve seat, and elastomer wipers and seal rings are installed in the poppet body to create a tight seal against the valve rod. The wipers also help eliminate seizing or hanging up on the valve rod during the stroking cycle.
Operation
On the downstroke, the poppet designed standing valve positively seals the tubing fluid from re-entering the pump barrel. As the plunger continues its downward motion , the travelling valve opens and fluid enters the upper pump chamber.
On the upstroke, the travelling valve closes off the pump chamber from the well bore fluids. The complete fluid is then carried upward through the now open standing valve poppet and on to the tubing. At the top of the stroke, the standing valve poppet closes with a liquid tight seal and the cycle repeats.
Advantages
* Effective for foamy gaseous fluid wells
* Maximizes allowable inflow
* Eliminates use of a conventional standing valve
* Handles sandy viscous fluids
* Eliminates gas locking
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