Abstract: Drill pipe damage primarily manifests as grooves and scratches on the joint shoulder, as well as corrosion and erosion of the pipe body. This article analyzes the causes of drill pipe damage and maintenance methods during drilling operations, aiming to provide guidance for drilling operations, extend the service life of drill pipe, and prevent
Post-weld heat treatment (PWHT) of pipelines usually refers to heat treatment below the metal's phase transition point, which is also commonly referred to as stress relief. The main functions of post-weld heat treatment are to release residual stress, reduce diffusible hydrogen, and improve microstructure and properties. In addition, post-weld heat treatment (PWHT) has other functions
Oil and natural gas are national strategic reserves. As oil and gas field exploration and production gradually shift to deepwater offshore, deep terrestrial formations, and unconventional replacement resource development, the demand for high-end special steels for oil and gas applications has increased significantly. World Metal Herald and Daye Special Steel, a subsidiary of CITIC Pacific
Corrosion has long been a hazard in the petrochemical industry. A slight negligence can damage equipment at best, or even cause accidents or disasters at worst. According to statistics, approximately 60% of damage to petrochemical equipment is caused by corrosion. Therefore, scientific considerations are paramount when selecting petrochemical equipment and materials. The following discusses key
Cryogenic treatment of metals significantly reduces wear and corrosion in marine components, resulting in reduced maintenance, reduced replacement costs, and extended service life. However, this technology has been slow to develop since World War II and has only recently become an effective means of improving the wear and corrosion resistance of heat-treated components. This article
The pipe body material of oil drill pipe is generally low-carbon chromium-molybdenum alloy steel. During drilling operations, the drill pipe is often subjected to complex loads such as tension, bending, torsion, impact, and collision. The service environment is very harsh, which requires the drill pipe to have high strength and high impact toughness. If the
The primary benefit of a double centralizer is stabilizing the azimuth. In practice, we've found that in most cases, dual centralizers stabilize and slightly increase azimuth. Some drill string configurations often exhibit a strong azimuth increase, but proper use prevents azimuth loss. Therefore, dual centralizers should always be used when the azimuth is just right
Pipelines are essential for transporting oil, natural gas, and even solid materials like coal over long distances. As global energy demands grow, high-pressure, long-distance transmission pipelines have become vital for large-scale natural gas delivery. This has driven the rapid development of high-grade pipeline steels. In harsh environments, traditional welded pipes often fall short, making
T/P91 alloy steel is widely used in high-temperature and high-pressure piping systems, especially in power and petrochemical industries. While its welding and heat treatment processes are well-documented, there remains some confusion and inconsistency in practical applications, particularly regarding the selection of post-weld heat treatment (PWHT) temperatures and durations. This article offers a practical perspective
Oil and natural gas are vital national strategic resources. As exploration and production shift toward deepwater offshore fields, deep terrestrial formations, and unconventional resources, the demand for high-performance materials, particularly high-end specialty steels, has increased significantly. These demanding environments require steel materials with exceptional strength, corrosion resistance, and reliability. To address this rising demand,
