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Why are oil rod pumps so crucial and irreplaceable in oil production? In the middle and late stages of oilfield development, formation energy declines, and crude oil can no longer flow to the surface on its own. Mechanical means must be used to lift the oil. Among all mechanical oil production methods, rod pumping is the most mature and widely used, accounting for over 60% of global onshore oil well production. Without the economical and reliable mechanical lift methods represented by oil rod pumps, sustained and stable commercial production would be impossible. So, how does this globally used rod pump system continuously lift crude oil to the surface?