1. Aluminum alloy drill pipe
The main advantage of aluminum alloy drill pipe is lightweight, which improves the drilling depth of the drill rig, has high toughness and good mechanical properties, and has low friction with the shaft wall when lifting. Due to the good circumvention of this drill pipe, It has good anti-fatigue performance, and its fatigue life is longer than the wear life, so when it rotates through the dogleg well section, its damage is relatively small, so it is more advantageous to use it in the curved well section or in the high-angle well, horizontal well.
2. Drill pipe with doubled fatigue life
Ordinary design drill rods have thick welding diameters, the inner thickened deconic section is short, and the stress concentration near the pipe body is large. It is easy to cause early rise fatigue or corrosion fatigue where the excessive thickening area disappears. In order to improve the life of the drill rod, the cone must be made The length miu of the surface part and the excessive arc radius R from the mother tube to the inner diameter conical surface are enlarged, that is, the requirements of miu> 100mm and R≥300mm must be met.
3. High toughness drill pipe
In order to meet the needs of low temperature and acid environment drill rods, a high toughness drill rod has been developed. This drill rod is characterized by unique chemical composition and special quenching-tempering heat treatment. Generally, refined steel is used. Among them, sulfur and phosphorus magazines and harmful gas content have strict requirements.
4. High torsion link joint drill pipe,
This kind of joint is used in high-inclination directional wells, ultra-deep wells, and hydrogen sulfide-containing gas wells. Compared with ordinary joints, there are two more flat parts of the external thread base and external thread flange, and the torsion resistance is increased by 40 %the above.
The above information is provided by drill pipe manufacturers.
