-
-
-
-
Honor
-
-
-
-
-
Contact
-
Four Technical Characteristics of Cable Drill Pipe
Release time:
2021-12-16
Author:
Source:
The 1. drill pipe body adopts G105 and S135 oil pipe conforming to API standard for production. Through overall heat treatment, the overall mechanical property can be improved and the service life can be prolonged. In order to reduce the connection point of drill pipe and meet the use requirements of narrow space in underground coal mine, the length of drill pipe shall not exceed 3m. And the use of a larger inner diameter of the rod can increase the overall inner diameter of the drill pipe, reduce the loss of liquid kinetic energy in the transmission process, and can reduce the overall quality of the drill pipe. 2. thread structure The force of the thread structure is relatively complex, and fatigue failure or fatigue fracture is prone to occur under the action of various loads such as tension, compression, torsion, and bending. previously made
1. drill pipe body
The drill pipe body adopts G105 and S135 oil pipe conforming to API standard for production. Through overall heat treatment, the overall mechanical property can be improved and the service life can be prolonged. In order to reduce the connection point of drill pipe and meet the use requirements of narrow space in underground coal mine, the length of drill pipe shall not exceed 3m. And the use of a larger inner diameter of the rod can increase the overall inner diameter of the drill pipe, reduce the loss of liquid kinetic energy in the transmission process, and can reduce the overall quality of the drill pipe.
2. thread structure
The stress of the thread structure is more complex, and fatigue failure or fatigue fracture is easy to occur under the action of various loads such as tension, compression, torsion and bending. In the past, this kind of fatigue fracture often occurs at the threaded connection of the drill pipe. In order to improve the weak link of the drill pipe, the overall structure of the thread adopts a double taper design, the taper of the joint thread is consistent with the taper of the rope coring drill pipe thread, and increases the thread root area to improve the thread connection strength.
3. cable design
The underground drilling measurement system often uses the cable drill pipe to realize the wired measurement while drilling, which can overcome the problems existing in the connection installation between the cable and the drill pipe in the past, the cable often affects the normal drilling process, and the cable cannot be reliably connected during the drilling process. The central cable is adopted, and the positioning retaining rings at both ends of the drill pipe and the hole are fixed with elastic retaining rings to transmit signals for the hole bottom measurement probe and the hole monitor.
4. production process
The main body of the cable drill pipe is processed by heat treatment, friction welding and numerical control machine. Among them, joint heat treatment, friction welding, post-weld heat treatment and fine turning thread are all important processes in the process of drill pipe body processing.
The manufacturing process of drill pipe is divided into joint thickening integrated type and friction welding type. The joint adopts nitriding treatment, which has high strength and hardness, ensures the reliability of the connection, strengthens the wear resistance of the screw thread, and improves the service life of the drill pipe. The key process of cable drill pipe processing is friction welding. Friction welding is a solid-state welding method. The two friction surfaces generate heat through mechanical friction motion, heat the surface of the weldment to a plastic state, and then apply axial pressure to connect the same metal or dissimilar metal firmly together. Its characteristics are: full-section welding, no defects such as pores and cracks, stable welding quality, high processing efficiency, welding surface is not easy to oxidize, the interface is fine, the parameter reproducibility is good, and the same strength as the base metal can be obtained. The welding area of the inner hole of the drill pipe is machined to ensure the smooth transition between the joint and the rod body. The joint and the rod body are connected by friction welding technology, which not only ensures the strength of the joint, but also reduces the quality of the drill pipe, and its strength can meet the requirements of the hole bottom motor drilling, but also meet the requirements of the hole power rotary cobalt.
Key words:
Technology, drill pipe, thread, adoption, friction, joint, welding, overall, strength, processing
