Study on anti-eccentric wear technology by self-lubricating tubing with anti-wear and anti-corrosion coating

摘要

In recent years, with the increasing of the directional wells or high angle wells, and the growing of containing water of oil wells, the problem of eccentric wears is becoming more seriously and restricting the normal production of oilfield. Self-lubricating tubing with anti-wear and anti-corrosion coating was invented, based on the analysis of the mechanism of eccentric wears. The coating microstructure was analyzed using scanning electron microscopy (SEM). The corrosion resistance was evaluated by the Cortest high temperature and pressure autoclave. The wear resistance was analyzed by the MG-200 wear tester. The results show that the microstructure of the coating is fine and netted. The coating is no impurities and good integrity. The problem of softening, blistering, or loose was not found after 168h corrosion tests under the high temperature and pressure conditions. In addition, the adhesive ability of the coating can meet the industry standard 1. The coating is 5 times the corrosion resistance of N80 tubing. And the friction coefficient is 75.79% lower than that of N80 tubing. The wear resistance of N80 tubing is increased by 29.3 times. So the coating can play dual role of friction-reducing and anti-wear. According to oilfield application results, the technology can solve the problem of eccentric wears and extend significantly the period of well-repair according.