The outer thickened seamless casing pipe adopts tapered pipe round thread, which is thickened by the joint to complete the connection and sealing. Its tooth shape is triangle, dome round bottom, tooth shape angle is 60°, thread taper is 1:16, tooth shape angle The bisector is perpendicular to the axis. When the thread is tightened, the flanks of the internal and external threads are tightly sealed with an interference fit, which is easy to process, has sealing performance with thread grease, has some joint strength, and is relatively simple to maintain and use on site.
The characteristics of the outer thickened seamless casing pipe:
1. The joint strength is strengthened by upsetting the joint.
Without changing the shape of the thread, the size of the joint is increased through the upsetting process, which improves the joint strength and meets the requirements of the next depth.
2. After the cooperation with the thread grease, the outer thickened seamless casing pipe has a gap of 0.076mm between the tooth top and the bottom of the tooth. When the thread is tightened, the tooth top gap is filled with thread grease. After the thread grease is solidified, the leakage channel is blocked. So as to complete the sealing effect.
The outer thickened seamless casing pipe has an indelible dedication in the history of the development of the petroleum industry. With the development of the petroleum industry and the increasingly harsh geological conditions, the outer thickened seamless casing pipe thread gradually conforms to the requirements of special formations.