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What are the factors that cause the fracture of geological drill pipes?

Updated:2021-08-06
Summary:

When geological drill pipes are broken, lost drills, br […]

When geological drill pipes are broken, lost drills, broken joints, etc., the user is very distressed. So, what are the factors that cause the fracture of geological drill pipes?

 

The first is the selection of geological drill pipe materials. If the drill pipe uses ordinary steel, its toughness, hardness, and wear resistance cannot meet the industry standards of geological drilling. The friction damage is severe during drilling, and it is easily twisted when subjected to lateral vibration. In turn, the drilled hole is bent. At present, most domestic manufacturers use high-quality drill pipes. The geological drill pipes produced by Qianjiang Machinery use Shanghai Baosteel R780 material for the rod body and 42CrMo material for the joint. This ensures that the drill rod has the characteristics of high bending strength, large rotating torque, and stable operation.

 

The second is the processing technology of geological drill pipes. The processing of geological drill pipes is mainly quenching, friction welding, and thread processing. A very important link is friction welding and thread processing. Friction welding is under pressure, under constant or incremental pressure and torque, and uses the relative movement between the welding contact end surfaces to generate frictional heat and friction on the friction surface and its nearby areas. The heat of plastic deformation causes the temperature of its surrounding area to rise to a temperature range close to but generally lower than the melting point. The deformation resistance of the material is reduced, the plasticity is increased, and the oxide film at the interface is broken. Under the action of the upsetting pressure, the plasticity of the material is accompanied Deformation and flow, a solid-state welding method that realizes welding through molecular diffusion and recrystallization at the interface.

 

The thread processing adopts advanced automatic processing equipment, which effectively guarantees the processing accuracy of each product. The production process of friction welding and thread processing ensures the coaxiality standard of multiple connections of drill rods during deep hole drilling, which is similar to similar products. In comparison, it has the characteristics of high bending strength, large rotating torque, and stable operation.

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