Portable pulling rigs began to replace the three-pole derricks as a tool for performing maintenance and repairs on oil wells in the 1930s but once most of the derricks had been destroyed in a severe wind storm in the 1950s, the portable pulling rig became the machine of choice. Horses were used to pull the portable machines to the wells where they were needed. A steel cable was attached to the top of the pump, through a pulley at the top of the mast on the rig and through another pulley at the bottom of the rig, and finally to the horses.
Oil Drilling Techniques: Portable Pulling Rig
Video clip. Charlie Fairbank discusses how portable pulling rigs work.
Duration: 01:46 minutes - Transcription
Later, tractors replaced horses for moving the equipment, and a gas-powered motor which sat behind the mast alternately wound and unwound a cable to lift the pump.
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