硬质涂层膨胀锥减摩耐磨性能

Wear resistance and anti-friction of expansion cone with hard coating

为降低膨胀锥/膨胀管间摩擦阻力,提高膨胀锥耐磨损性能,制备了硬质涂层膨胀锥,研究了硬质涂层膨胀锥的性能,并对其进行了现场应用。采用超音速火焰喷涂技术在合金钢膨胀锥表面制备了碳化物硬质涂层,使膨胀锥表面硬度提高了近60%。摩擦磨损实验结果表明:锂基脂润滑条件下,硬质涂层使膨胀锥试块摩擦系数降低超过30%,磨损量降低约33%;水润滑条件下,硬质涂层使膨胀锥试块摩擦系数降低约25%;硬质涂层显著降低了膨胀锥和膨胀管间的摩擦阻力,减轻了磨损,增加了膨胀锥的使用寿命。现场应用结果表明:硬质涂层膨胀锥具有良好的耐磨损性能,应用4口井后涂层与膨胀锥基体结合良好,表面无明显磨损现象,成功完成现场套损井的修补作业。

To improve wear resistance of expansion cone and decrease the friction between cone and tube, an expansion cone covered by hard coating was prepared and applied in the field. The carbide-based hard coatings were fabricated on the expansion cone surface by using high-velocity oxygen fuel thermal spraying technology, and the coating improved surface hardness of the cone by nearly 60%. The wear tests indicate that： the hard coating reduces friction coefficient of expansion cone sample by over 30% and＇wear loss by 33% with lithium grease lubricating; the hard coating reduces friction coefficient of expansion cone sample by about 25% with water lubricating; the hard coating reduces the wear and friction between expansion cone and tube significantly, and extends the cone life. Field tests indicate that： the expansion cones with hard coating have excellent wear resistance; the coating bound well with the expansion cone substrate after application for four wells, and no evident abrasion happens on the cone surface; the cone is successfully applied in the field to repair the damaged casings.