1. understanding of drill pipe properties. Geological drill pipe is a kind of drilling tool that uses alloy steel pipe to thicken the head at both ends, turn the small pitch taper thread, and connect with the lock joint. It is used in the field of geological exploration, transmits the torque of the drilling rig to the bottom hole bit, and is responsible for transmitting drilling fluid. Common specifications include φ 34*1m, φ 42*1m, φ 50*1m, φ 60*1m, φ 63.5*1m, φ 73*1m, etc. Common connection methods include male and female connection (tapered thread) and joint connection (rectangular internal thread).
2. understanding of the drill pipe material. At present, the national standard materials are DZ40, DZ50, DZ60, R780, etc. Among these material models, the texture of R780 is the best, and it has outstanding performance in toughness and wear resistance. The geological drill pipe body produced by Yining Science and Technology adopts special geological alloy steel pipes (R780, DZ50), while the geological drill pipe drill bit adopts high-quality alloy structural steel (42CrMo) after rough machining, vacuum quenching and tempering heat treatment, and surface nitriding treatment after finish machining, which can effectively eliminate the problems of gluing and buckling, is more wear-resistant, easy to disassemble, and greatly improves the fatigue strength and shear strength.
3., according to the drilling capacity parameters of the drilling rig and the drilling diameter, the drilling depth can be drilled, and the drill pipe diameter is determined according to the empirical ratio of D/d = 4.5.
4. according to the main parameters of drill pipe design, namely torque, feed pressure to select drill pipe. We know that the torque transmitted by the drill pipe is transmitted by the meshing and extrusion of the key and the keyway. Due to the processing accuracy, material properties, welding technology and other reasons, it is impossible to divide the torque evenly on each key, and each contact key cannot contact the force evenly. Therefore, the long key is often partially broken by twist. When selecting the design torque of the drill pipe, it must be greater than the design torque of the drilling rig.
5. understanding of the drill pipe process. In addition to the selection of high-quality materials, surface quenching is also very important to ensure wear resistance. The standard processing of the threaded part can ensure that the joint is frequently unscrewed without being damaged. The geological drill pipe produced by Yikuang Technology adopts advanced friction welding technology for production and processing. The drill pipe has the characteristics of high bending strength and firm welding, which can ensure the requirements for straightness during deep hole drilling and has a long service life.
