The general term for the whole drilling pipe column and its joints used in the borehole during exploration construction (excluding the casing for hole protection). The drilling tool consists of an active drill pipe, a drill pipe, a core pipe, a reamer and a drill bit at the bottom end, and if necessary, a sedimentation pipe or drill collar is added to the upper part of the core pipe. The function of the drilling tool is mainly to transmit the bit pressure and rotation torque to the drill bit in the process of drilling the rock formation, and to transport the drilling flushing fluid to the bottom of the hole to collect the rock core.
Each component of the drilling tool is made of high-quality seamless steel pipe, which has excellent physical and mechanical properties to withstand the alternating load, fatigue and wear of the drilling tool itself during the drilling process. The deeper the borehole, the higher the performance requirements for the drilling tool. After a certain working period, the drilling tool will be scrapped due to wear and corrosion.
Drilling tools are mostly made of high-quality alloy steel or low-alloy steel, and are properly heat treated to improve their performance. China has successfully used alloy steel pipes containing manganese, tantalum, vanadium, titanium, silicon, boron and other elements to manufacture drilling tools, and the performance meets the requirements of the “GB3423-82″ national standard after appropriate heat treatment. According to this standard, drilling steel is divided into 6 types: DZ-40, DZ-50, DZ-55, DZ-60, DZ-65 and DZ-75.
Grace Ma
Post time: Mar-21-2025
