钢体PDC钻头耐冲蚀性能研究-油气井工程专业论文.docxVIP

钢体PDO钻头耐冲蚀性能研究 钢体PDO钻头耐冲蚀性能研究 冯云春(油气井工程) 指导教师：徐依吉教授 摘要 随着高压喷射钻井技术的不断完善，钻井泵压不断提高，钢体PDC 钻头的冲蚀失效问题日益加重，严重影响了钻井速度。因此，提高PDC 钻头的耐冲蚀性能就迫在眉睫。通过大量调研与室内实验发现，Ni60和 Co—Wc自熔合金粉末等通过堆焊在母材表面能够有效地防止钻井液类的 浆体冲蚀。在此基础上设计了几种含不同质量份数WC的Ni60自熔合金 以及Co．WC、TiC+Ni40％等耐冲蚀涂层材料，通过堆焊以及超音速喷涂 两种方法制成试件，然后通过冲蚀实验判断试件的耐冲蚀性能优劣。实 验研究表明：Ni60+WC40％和Co-WC两种涂层的耐冲蚀性能最佳，综合 考虑Ni60+WC40％的性价比最高；本文还借助扫描电镜对冲蚀后的试件 进行观察，发现泥浆对涂层的冲蚀破坏机理为：对硬度较低相以微切削 和冲击疲劳断裂为主，使硬质相失去保护，在较小的压力下便能被冲蚀 破坏，涂层中WC强化颗粒的粒度、密集程度和交结状况也是影响涂层 的耐冲蚀能力的关键因素；通过实验发现堆焊技术更适合PI)C钻头表面 防护。 关键字：钢体PDC钻头，冲蚀，实验，堆焊，Ni60 Study Study on Erosion Resistance of Steel BodyPDCBit FENG Yun-chun(OilGas Well Engineering) Directed by Professor XU Yi-ji Abstract With the improvement of the hi．gh pressIlre drilling technology,the p陀ssum of the drill pump was increased continuously．Erosion of steel-body PDC bit Was more and more serious．Ⅵlerefore．erosion resistance OfPDC bit should be enhanced immediately．The investigation and laboratory experiment indicated that welded surfacing layer of Ni60 and Co·WC self-melting alloy powder can prevent drilling fluid from eroding body of PDC bit，SO several erosion resistance materials were designed on the base of them．And then， they were made from some erosion specimens by resurfacing welding and high velocity Oxy-Fuel spraying．The experiment indicated that specimens of Ni60+40％WC and Co-WC self-melting alloy powder are better than other． Eroded specimens were observed by scanning electron microscope．The main mechanism of erosion is that the hard phase is micro-curing action and impact rapture．The experiment indicated that resurfaeing welding technology is fitter for PDC bit than high velocity Oxy·Fuel spraying． Key words：Steel boay PDC bit，Erosion,Experiment，Resurfacing welding， Ni60 独创性声明本人声明所呈交的论文是个人在导师指导下进行的研究工作及 独创性声明 本人声明所呈交的论文是个人在导师指导下进行的研究工作及 取得的研究成果。尽我所知，除了文中特别加以标注和致谢的地方外， 论文中不包含其他人已经发表或撰写过的研究成果，也不包含为获得 石油大学或其它教育机构的学位或证书而使用过的材料。与我一同工 作的同志对本研究所做的任何贡献均已在论文中作了明确的说明并 表示了谢意。 签名；．冯乏考 -¨占年多月工日 关于论文使用授权的说明 本人完全了解石油大学有关保留、使用学位论文的规定，即：学 校有权保