Idea of Oil Pump Icon
This is an oil pump jack. It it a very large drill attached to a platform by a pole. This creates a fulcrum that moves the drill head up and down, pumping the oil from inside the Earth to the surface. It has a counter-balance on the right hand side of it in order to drive the motion of the jack.
This page shows the different variations of the Oil Pump from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.