Paper: CASING PUMP OPERATION

When the drilling operation of an oil well is finished, an oil string of casing is left in the hole. In the early days, if the well would flow, it was allowed to flow through the casing. When it quit flowing, tubing was installed inside the casing. Oil was then pumped through the tubing with a working barrel and valves. The valves used leather cups with a ball check in the traveling and the standing valves. When this type pump needed repairs, it was necessary to pull both the rods and tubing to effect repairs on the pump. Then the rod pump came into use. This pumped was seated in the tubing and only the pump and rods were pulled for repairs to the pump.