About special buckle

1. Introduction of special buckle
Special thread is a pipe thread with special structure different from API thread. Although API threaded Casing has been widely used in oil well production, its disadvantages are obvious in the special environment of some oil fields. Although API round threaded string has good sealing performance, the tension of the threaded part is only 60% to 80% of the strength of the string, so it cannot be used in deep well production. Although the API eccentric trapezoidal thread string has much higher tensile performance than the API circular thread string, its sealing performance is not good enough to be used in high-pressure gas Wells. In addition, thread grease only works in temperatures below 95 ° C, so it cannot be used in high-temperature Wells.
Compared with API round thread connection and eccentric trapezoidal thread connection, special buckle connection has made breakthrough progress in the following aspects :⑴ Good sealing performance. Through the design of elastic and metal sealing structure, the gas sealing resistance of the joint reaches the ultimate internal yield pressure of the tube body. ⑵ High connection strength. The connection strength of the oil sleeve connected by the special buckle reaches or exceeds the strength of the pipe body, which fundamentally solves the problem of slipping; (3) Through the selection of materials and the improvement of surface treatment technology, the problem of thread bonding is basically solved; (4) Through structural optimization, the stress distribution of the joint is more reasonable and more conducive to stress corrosion resistance; ⑸ The reasonable shoulder strap structure design makes the feeding operation more convenient.
At present, more than 100 special buttons with patented technology have been developed in the world.