金刚石钻头钴基胎体材料冲蚀磨损的量化研究

Research on Quantification of Erosion-corrosion of Co-based Matrix Material for Diamond Bits

摘要:

金刚石钻头的工作寿命和性能很大程度上取决于胎体材料的性能，国内外对胎体材料的研究主要集中在机械冲刷和井底流场的研究，没有考虑携带岩屑的钻井液对钻头胎体材料的电化学腐蚀以及机械冲刷和电化学腐蚀的相互作用。介绍了胎体材料冲蚀磨损的工作原理，根据试验条件与要求，采用摩擦学和电化学腐蚀原理，设计了模拟现场的冲蚀磨损试验台，对钴基胎体材料进行冲蚀磨损试验并进行了量化。结果表明，胎体材料冲蚀腐损是由纯机械冲刷、电化学腐蚀以及它们共同作用引起。因此，在腐蚀性环境中设计胎体材料，要考虑其抗腐蚀性。

Abstract:

The service life and performance of diamond bits, to a great extent, are determined by the properties of matrix. The research on matrix materials is mainly concentrated in mechanical erosion and downhole flow field at home and abroad without consideration on electrochemical corrosion and synergy of mechanical erosion and electrochemical corrosion to the matrix material. In this paper, according to the experimental demands and conditions, a slurry erosion test platform is designed by the principle of tribology and electrochemical corrosion, and Co-based matrix is chosen as the experimental sample. The results show that erosion-corrosion of matrix material is caused by pure mechanical erosion, electrochemical corrosion and their synergy as well. So corrosion should be taken into consideration for design of matrix material in corrosive condition.