| Oversize Tubing Pumps The Oversize Tubing Pumps are used whenever an API Tubing Pump plunger is not large enough in diameter to deliver the necessary production quantity. Oversize Tubing Pumps are characterized by the need to pull the tubing to retrieve any part of the pump, because the plunger is larger in diameter than the inside of the tubing above the pump. This necessitates the use of an On-Off Tool to disconnect the sucker rod string from the Oversize Pump plunger when the pump is pulled for servicing. A Tubing Drain is also needed to drain the tubing during servicing. The most popular style of Oversize Tubing Pump is the "Slim-Hole" style. It can have a larger diameter plunger than other oversize styles while retaining the same outside diameter of the pump assembly. It is available in several sizes and in many materials for corrosion and abrasion resistance. The Harbison-Fischer Spoon Bill Tubing Drain is commonly used as illustrated to provide a means of draining the tubing when the pump is pulled. The other style of Oversize Tubing Pump is
the API Style Oversize Tubing Pump. It is a standard API tubing pump
that is run on smaller tubing than the Tubing Pump size. It uses an
externally threaded barrel with extensions. The API style uses commonly
available parts which can be chosen for corrosion or abrasion resistance.
Two Harbison-Fischer Tubing Drains are available for this style: the
Harbison-Fischer Spoon Bill Tubing Drain and the Harbison-Fischer J-Slot
Tubing Drain. The Harbison-Fischer J-Slot Drain functions as the plunger
hanger as well as the swage reduction coupling on top of the pump which
is needed to connect the pump to the smaller tubing above the pump. |
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