Petroleum: The Pumping Unit (OG-09)
If sufficient subsurface
pressure exists, oil (mixed with gas and sometimes water) will flow from a
well unassisted. But in time, as pressure declines with production, oil
will cease to flow and must be lifted artificially by a pumping device.
The pumping unit commonly consists of a power-driven walking beam, which
is connected to a pump at the bottom of the well by a string of steel rods
running through the tubing. The up-and-down motion of the walking beam
activates the subsurface pump piston and lifts the oil up in the tubing to
the surface. The size of the pumping unit is proportionate to the depth of
the well and the amount of liquid that must be lifted.
Our Hoosier State Beneath Us:
Oil and Gas