Question 1: What are the common buckle types of oil pipes in API 5CT specification, and how to distinguish them?
Answer
There are three common buckle types for oil pipes in API 5CT specification, namely EU, NU and NewVam. NewVam is actually a trapezoidal buckle (the buckle cross section is rectangular), and it also does not have external thickening, so it is easy to distinguish. EU (External upset) is an external thickening oil pipe buckle type. When you recognize the variable buckle joint on the workshop shelf, you will also find three biano logos related to EU, among which EUE (External Upset End) indicates external thickening end, EUP (External Upset Pin) indicates external thickening male buckle, and EUB (External Upset Box) indicates external thickening female buckle.
Question 2: What are the common buckle types of drill pipes in API 5CT specification, and what are their characteristics?
Answer
Common buckle types of drill pipes in API standards are REG (API Regular Thread) and IF (API Internal Flush). REG is a regular thread type, which is used for regular drill pipe joints. This thread type was used to connect internal thickened drill pipes, forming a drill pipe joint with an inner diameter smaller than the inner diameter of the thickened end of the drill pipe, and the inner diameter of the thickened end of the drill pipe is smaller than the inner diameter of the drill pipe body. IF is an internal flat thread type, which is used for connecting external thickened or external internal thickened drill pipes, forming a drill pipe joint with an inner diameter that is equal to or close to the inner diameter of the drill pipe body.
Question 3: How are the thread types of casing couplings classified in the API 5CT specification?
Answer
Casing couplings are produced and processed in accordance with the "API SPEC 5CT and 5B specifications", and are divided into round thread couplings from 4-1/2 inches to 20 inches and stepped casing couplings (BTC). Round threads are further divided into long round couplings (LTC) and short round couplings (STC).
Question 4: What are the commonly used thread types for punching pipes, and how to distinguish them?
Answer
The common buckle types for punching pipes are Hydrill 511, Hydrill CS and TSWP. 2 - 7/8 is generally Hydrill 511, 1.9 is generally Hydrill CS, and others such as 4 are TSWP. Among them, Hydrill CS and TSWP are both stepped buckles with a partial trapezoidal shape, which are difficult to distinguish from the appearance and can only be distinguished by the outer diameter size.
Question 5: What are the end processing forms of API 5CT short-circuit, and what do they mean?
Answer
The end processing forms of short-circuit are divided into double male short-circuit and tubing short-circuit. Double male short-circuit means that both ends are male buckles and external threads. Tubing short-circuit means that both ends are one male and one female thread, one end is internal thread, and the other end is external thread. For example: 2 - 7/8, 6.5#, N80, EUE, 2FT, the default is one male and one female, one end with a coupling and one end with a thread protector (thread cap).
