Drill pipe heat treatment refers to heating the drill pipe material to a certain
temperature and holding it for a certain period of time, and then rapidly
cooling or slowly cooling it to achieve a certain metallographic structure and
hardness. The drill pipe after heat treatment has higher strength, wear
resistance and corrosion resistance, thereby extending the service life of the
drill pipe and improving drilling efficiency.
Heat treatment process
Drill pipe heat treatment mainly includes
two steps: Quenching and tempering.
Quenching: Heat the drill pipe body to 880℃-930℃, keep it warm for 40-60 minutes, and
then quickly cool it to a quenching liquid of 10℃-30℃ for no less than 30 seconds.
Tempering: Heat the quenched drill pipe body to 560℃-590℃, keep it
warm for 60-85 minutes, and then naturally cool it to room temperature.
Benefits of drill pipe heat treatment
1. Anti-corrosion: The oil working
environment is seriously polluted and is easily affected by corrosion during
the drilling process. After heat treatment, the drill pipe can effectively
improve its corrosion resistance and maintain corrosion resistance for a long
time.
2. Improve hardness: After heat treatment,
the drill pipe has fine grains and a denser metallographic structure, thereby
improving the hardness of the drill pipe. This increase in hardness not only
prevents wear caused by friction, but also helps to improve the strength and
toughness of the drill pipe.
3. Improve toughness: Heat treatment of
drill pipe can improve the internal structure of steel, reduce grain size, and
make the structure dense, thereby improving the toughness of the drill pipe and
reducing the risk of drill pipe breakage.
4. Improve heat resistance: In high
temperature environments, conventional steel is prone to chemical changes,
resulting in performance degradation, while heat-treated drill pipes can
maintain a certain heat resistance and can be used for a long time in high
temperature environments.
5. Extend service life: Heat-treated drill
pipes have the advantages of wear resistance, corrosion resistance, and high
strength. They can be used in complex working environments, extend the service
life of drill pipes, reduce maintenance costs, and improve production
efficiency.
Summary
Drill pipe heat treatment has important
application value in the field of oil exploration and production. Heat-treated
drill pipe has multiple advantages, such as corrosion resistance, enhanced
hardness, improved toughness, improved heat resistance and extended service
life. Compared with conventional drill pipe, heat-treated drill pipe is more
suitable for use in harsh working environments, which helps to improve
exploration and production efficiency and reduce costs.