海上无隔水管钻井泥浆举升泵叶轮耐磨性能研究

Research on wear-resistance of mud lifting pump impeller for marine riser-less drilling

摘要:

在海上钻井中，采用离心泵型式的无隔水管泥浆举升泵，通过电机带动叶轮转动，从而举升泥浆。由于举升泵长时间工作，泥浆中携带的大量岩屑会对叶轮造成磨损，严重影响泥浆举升泵的正常使用。因此，有必要对叶轮进行耐磨工艺处理，提升材料耐磨耐腐蚀性能。通过优选叶轮本体材料，调研表面耐磨处理工艺，并进行耐磨试验。试验证明，2205双相不锈钢综合性能较好，适用于无隔水管泥浆举升工况；碳化钨超音速喷涂工艺对叶轮耐磨性能提升最大，泥浆举升泵可选取双相不锈钢作为叶轮材料，并进行碳化钨超音速表面喷涂工艺处理，从而提升泥浆举升泵使用寿命。

Abstract:

The centrifugal-pump-type riser-less mud lifting pump is adopted in offshore drilling， lifting mud by motor-driven impeller rotation. During long term operation， abundant cuttings carried in drilling fluid cause severe impeller wear， which seriously impairs normal service of the mud lifting pump. Therefore， it is necessary to adopt wear-resistant treatment for impellers to improve their wear and corrosion resistance. In this study， impeller substrate materials were optimized， surface wear-resistant treatment processes were investigated， and wear-resistance tests were carried out. The test results show that 2205 duplex stainless steel possesses favorable comprehensive properties and is suitable for riser-less mud lifting service conditions. Tungsten carbide supersonic spraying achieves the most significant improvement in impeller wear-resistance. Duplex stainless steel is recommended as the impeller substrate material for mud lifting pumps， combined with tungsten carbide supersonic surface spraying， so as to extend the service life of mud lifting pumps.