Sucker rod is thin rod of pumping Wells, it connected to pump up under the polished rod, can have the effect of transmission power. In the general case sucker rod joint length of seven or eight meters, material is on the surface of the high carbon steel hard chromium plating. With internal thread hoop loose in the tubing connected, extends to the underground reservoir on the piston, through the reciprocating motion to pump oil, and the length of the well generally at about 2 km, with shengli oilfield as an example, its more than three thousand m in the deepest place.

      Tubing coupling is a kind of oil field drilling tools, tubing collar is mainly used for pipe connection. Tubing coupling mainly solves the existing collar because the problem of stress concentration is easy to produce fatigue fracture. Sucker rod and tubing coupling both are indispensable two key projects of production operations