What are the causes of geological drill pipe fracture?

The first is the selection of geological drill pipe. If the drill pipe is made of ordinary steel, its toughness, hardness and wear resistance can't reach the industry standard of geological drilling, and the friction damage is serious when drilling, and it is easy to distort when it is subjected to lateral vibration, thus making the drilling hole bend. At present, most domestic manufacturers use high-quality drill pipes. The geological drill pipes produced by Ruilong Drilling Tools are made of DZ50 and R780 materials from Shanghai Baosteel and Hunan Henggang, and the joints are made of Xining Special Steel. It ensures that the drill pipe has the characteristics of high bending strength, large torque and stable operation.

Secondly, the processing technology of geological drill pipe is mainly quenching, friction welding and thread processing. The most important links are friction welding and thread processing. Friction welding is to generate friction heat and plastic deformation heat on the friction surface and its adjacent area under the constant or increasing pressure and torque, so that the temperature of its adjacent area rises to a temperature range close to but generally lower than the melting point, the deformation resistance of the material decreases, the plasticity increases and the interfacial oxide film breaks. Under the upsetting pressure, the material is accompanied by plastic deformation and flow, which is caused by molecular diffusion and recrystallization at the interface.

Thread processing adopts advanced automatic processing equipment, which effectively ensures the processing accuracy of each product. The production process of friction welding first and then thread processing ensures the best coaxiality standard of drill pipe multiple connections during deep hole drilling. Compared with similar products, it has the characteristics of high bending strength, large rotating torque and stable operation.

Finally, the collocation of geological drill pipe with drill bit and drilling rig. Many users don't understand the matching principle of drill pipe and drill bit, drill pipe and drilling rig, which leads to the fracture of drill pipe thread and the twisting of drill pipe rod body.

Diameter difference is the primary factor we consider when matching drill pipe and drill bit. Diameter difference refers to the diameter difference between drill pipe and drill bit. As we all know, the diameter of drilling is caused by the diameter of drill bit, and the diameter of drill pipe is smaller than that of drill bit, so that the stress of drill pipe can be minimized when drilling.

The matching of drill pipe and drilling rig mainly depends on the torque of drilling rig and drill pipe. Generally speaking, the torque of drill pipe is less than that of drilling rig.

Therefore, when the geological drill pipe breaks, all the above problems should be considered first, and then the source of the problem can be determined and measures can be taken. We should also consider the above parameters when purchasing geological drill pipes in order to find the best products.