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<p>The scraping block is a key component of downhole cleaning tools, which removes rust, drilling residue, cement residue, and other debris from the inner wall of the well casing by rotating rubbing. The wear resistance of the scraping block is an important factor affecting the work efficiency, service life, and reliability of downhole cleaning tools. This study applies two common heat treatment processes, nitriding and quenching, to improve the wear resistance of the scraping block. Through reciprocating sliding wear test and wet sand rubber wheel test, the wear behavior of the two heat treatment processes rubbed by two frequently used well casing materials 42CrMo and AlSi 4330&#xa0;V, was comprehensively investigated under simulated working conditions. The results show that, the wear volume of the gas nitriding samples is lower. SEM and EDS analyses were conducted on the wear tracks after testing. During the reciprocating sliding wear process, the wear type of the gas nitriding samples is mainly abrasive wear and corrosive wear, while the quenched samples exhibit abrasive wear and adhesive wear. In the wet sand rubber wheel test, only abrasive wear occurred. The anti-adhesion and high hardness of the nitride layer of the nitriding samples are the reasons for their best wear resistance and the minimal wear on the friction pair sample which simulates the well casing.</p>

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Comparative study on the wear behavior of scraping block treated by nitriding and quenching

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月2日

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  • Weihai Xue,
  • Yuying Zhao,
  • Siyang Gao,
  • Rutao Ma,
  • Deli Duan

摘要

The scraping block is a key component of downhole cleaning tools, which removes rust, drilling residue, cement residue, and other debris from the inner wall of the well casing by rotating rubbing. The wear resistance of the scraping block is an important factor affecting the work efficiency, service life, and reliability of downhole cleaning tools. This study applies two common heat treatment processes, nitriding and quenching, to improve the wear resistance of the scraping block. Through reciprocating sliding wear test and wet sand rubber wheel test, the wear behavior of the two heat treatment processes rubbed by two frequently used well casing materials 42CrMo and AlSi 4330 V, was comprehensively investigated under simulated working conditions. The results show that, the wear volume of the gas nitriding samples is lower. SEM and EDS analyses were conducted on the wear tracks after testing. During the reciprocating sliding wear process, the wear type of the gas nitriding samples is mainly abrasive wear and corrosive wear, while the quenched samples exhibit abrasive wear and adhesive wear. In the wet sand rubber wheel test, only abrasive wear occurred. The anti-adhesion and high hardness of the nitride layer of the nitriding samples are the reasons for their best wear resistance and the minimal wear on the friction pair sample which simulates the well casing.