Drill pipe connections play a vital role in drilling operations, serving as the critical link between individual sections of drill pipes. Depending on the specific requirements of the drilling process, different types of connections are used in the oil and gas industry. Below are some of the most commonly used drill pipe connection types. REG (Regular Style Connection): The REG connection is typically used to join inner-upset drill pipes, where the outer diameter of the pipe is smaller than the inner diameter of the thickened section. This type of connection is mainly applied at the bit end of the drill string, where stress concentration in the threads is less of a concern due to the location of the drill bit. As a result, the API has maintained its specifications for this connection type over time. IF (Internal-Flush Style Connection): The IF connection is designed to connect externally-upset (EUE) or both internally and externally thickened drill pipes. It ensures that the inner diameter of the joint matches or closely resembles that of the thickened section. The thread design features a V-0.065 flat top and bottom triangular tooth with a width of 0.065 inches (1.651 mm). However, due to potential stress concentrations, this connection type has been gradually phased out by the API in favor of more robust alternatives. FH (Full-Hole Style Connection): The FH connection is used to join internally and externally thickened drill pipes, resulting in a joint where the inner diameter matches the thickened end, which is smaller than the standard pipe’s inner diameter. Although it has fewer thread specifications compared to other types, it comes in three variations—V-0.065, V-0.05, and V-0.040—making it popular for use in kellys, drill pipes, and drill collars. Its design allows for efficient flow and structural integrity during drilling operations. NC (Numbered Connection): For high-strength drill pipes with a minimum yield strength of 75,000 PSI or higher, the API recommends using numbered connections, known as NC connections. These connections are specifically designed to match pins and boxes with corresponding thread designations, allowing for interchangeability when the grade codes are the same. Thread pitch and type compatibility are essential for ensuring proper function and safety. NC connections range from NC10 to NC77, each with unique dimensions and applications. It's always recommended to consult with the tool joint manufacturer to confirm compatibility before use. Titanium Powder Sintered Filter Titanium Powder Sintered Filter,Titanium Filter Component,Titanium Powder Sintered Sheet,Titanium Powder Sintered Porous Element Baoji Qiyuexin Metal Material Co., Ltd. , https://www.qyxtitanium.com