The drill joint is part of the drill pipe, a branch joi […]
The drill joint is part of the drill pipe, a branch joint and a female joint, and is attached to both ends of the drill pipe. In order to enhance the connection strength of the joint, it is necessary to increase the wall thickness of the pipe body in the joint portion, which can be divided into: thickened, thickened, and thickened inside and outside. The connector has a thread (coarse buckle) to connect each single drill rod connector thread to a tapered tube thread with a sealing shoulder, and the shoulder shoulder rotate to seal, and the thread only plays a connection. The thickened method is different, and the threaded deduction of the corresponding joint is also different.
1. Inner flat: mainly used for external thickening drill pipes. It is characterized by the same inner diameter of the drill rod, and the flow resistance of the drilling fluid is small; but the outer diameter is large, it is easy to wear.
2. Through eye: Mainly used in internal and external thickening drill pipes. It is characterized by two inner diameters, and the flow resistance of the drilling fluid is greater than the inner flat, but the outer diameter is less than the normal.
3. Regular style: Mainly used in internal strength drill pipes and drills, salvage tools. It is characterized in that the inner diameter of the joint is smaller than the inner diameter of the pipe. The flow resistance of the drilling fluid is large, and the relative flow resistance is large in three buckles, but the outer diameter is small, the strength is large. The above three types of joints use V-threads, but the deduction, slap, taper, and size are very different.
4. Digital: This is a thread that is represented by an inches of the threaded base surface and a quarter-inch numeric value. Applied to drilling tools such as party drill rods, drill pipes, drills, drilling stabilizers.