Sucker rod is a long and thin rod in a pumping well. It is connected with polished rod on the top and Pumpjack on the bottom to transmit power.
The length of a single sucker rod is 7.62 or 8 meters, 9.14 meters, and the material is generally low-carbon alloy steel. After quenching and tempering treatment, it is connected one by one with internal thread clamps in the oil pipe and extends to the piston at the underground oil layer. The oil is pumped through reciprocating motion. At present, the length of oil wells is generally about 2000 meters, taking Shengli Oil Field as an example, the deepest one is more than 3000 meters.