In the inquiry to the oil casing , in addition to determining the material similar to the carbon steel pipe , it is also necessary to pay attention to the buckle type of the oil casing. Such as EUE, NUE, LTC, BTC, VAM TOP and other terms. Said are the button type of the port. There are many types, but the common ones are nothing more than these. Knowing this is helpful for the supply of oil casings . This is an important part of the knowledge of petroleum casing products.
thread type of oil casings
1, the common pipe thread type (Tubing Joint)
The commonly used buckle types of tubing are divided into three types: EU, NU and NewVam . These three types of buckles can be found in the tool shop. The EU and NU are difficult to distinguish from the appearance of the buckles. They are all triangular buckles, but they can be easily distinguished from the entire column. NU means no external thickening.
New Vam is actually a trapezoidal buckle (the cross section of the buckle is rectangular), and it is also without outer thickening, so it is easy to distinguish.
1) EU (External upset) outer thickening
The EU buckle is an external thickened tubing buckle type. Three kinds of EU-related piano logos will also be found during the process of knowing the buckle joints on the shop floor. The EUE (External Upset End) indicates the outer thickened end, the EUP (External Upset Pin) indicates the outer thickened male buckle, and the EUB (External Upset Box) indicates the outer thickened female buckle. In addition to using the pin and box to indicate the male buckle, the other indicates that the male button has 1. external thread 2. male 3. male thread. The female button has 1. female thread 2. internal thread 3. box 4. box thread.
2) NU (Non-upset) has no external thickening
NU means that there is no outer thickened tubing joint. In addition to no external thickening and EU generally there is a difference is that NU is generally 10 buckles per inch, EU is generally 8 buckles per inch. Where NUE means non-thickened end or end non-thickening. The same E means End.
3) New VAM
The buckle type is characterized in that the buckle section is substantially rectangular, the pitch is equal, the taper is not large, and there is no outer thickening. See the end of the production sleeve at the workshop.
2. Drill rod commonly used buckle type summary
Drill rod buckles are commonly found in REG and IF buckles, others such as FH are not found in the tool shop. According to the master experience, the REG buckle and the IF buckle are generally 5 buckles/in and 4 buckles/in, but greater than 4-1/2″ even 4 buckles/in is also a REG buckle, that is, greater than 4-1/2″. All are REG buckles, which are less than 4-1/2″ IF buckles.
1) Regular buckle type in the REG (API Regular Thread) API standard
Threads for regular drill pipe joints. This type of thread has been used to connect the inner thickened drill pipe, and the inner diameter of the drill pipe joint is 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 inner diameter of the drill pipe body.
The REG buckle and the IF buckle feel touched and feel different. The REG buckle is finer and the IF buckle is rougher because the buckle density per unit length is different.
2) Inner flat type in IF (API Internal Flush) API standard
Threads for internal flat drill pipe joints. This type of thread is used to connect the outer thickening or outer thickening drill pipe to form the inner diameter of the drill pipe joint, and the inner diameter of the thickened end of the drill pipe is equal or close to the inner diameter of the drill pipe body.
3) The eye-eye type in the FH (API Full Hole) API standard
Throughout the eye, as the name implies, it is just a big eye. That eye? It refers to the inner diameter of the drill pipe joint and the inner diameter of the drill pipe thickened end. Rather than the inner diameter of the drill pipe body, the two are generally smaller than the inner diameter of the drill pipe body.
3. Commonly used buckle type of blind tube screen
1) LTC (Long Thread Connector) long threaded connection
LTC threads are the same shape as STC threads and can be connected, but connections are generally not allowed because they can withstand the same maximum torque values.
2) STC (Stub (Short) Thread Connector) short threaded connection
Both STC and LTC threads are API standard threads, the difference is only the length of the buckle, the longer is LTC, the shorter is STC, the 4-1/2″ outer diameter tube, after I measured the buckle more than 3 inches The length is generally LTC, less than 3 inches for STC. This experience is still worthy of research, please ask the master.
BTC is very different from LTC and STC. It is very similar to NewVam. The distinction is made only from the outer diameter and use of the column.
4. Commonly used buckle type
The flushing pipe is a common pipe string for sand control completion, and its main purpose is to be the flow channel for the filling fluid of the completion section. Therefore, the pipe string has no coupling and no thickening, and only the 1.9-inch pipe has an outer thickening. The reason should be that the 1.9in tube wall is too thin. If it is not thickened, the direct buckle will affect the mechanical properties of the entire column. The flushing buckle is commonly used in the workshop as Hydrill 511, Hydrill CS and TSWP. 2-7/8″ is generally Hydrill 511, 1.9″ is generally Hydrill CS, and others such as 4″ is TSWP. Among them, Hydrill CS and TSWP are both trapezoidal stepped buckles, which are difficult to distinguish from the outer shape and are only distinguished from the outer diameter.
1)TSWP(BAKER OIL TOOLS WASHPIPE)
2)TSS(BAKER OIL TOOLS SPECIAL)
3) Hydrill 511
5. Sealing short cuts commonly used buckle type
ACME trapezoidal thread
Sealed short-cut multi-purpose ACME buckle, ACME buckle type features, the cross section is mostly trapezoidal (approximate rectangle), the buckle length is long, usually there is a section of the extension before the buckle.
6. Other buckle types
IN 4S thread type
The FL-4S buckle is found in the pressure test plug, which is approximately a right-angled trapezoidal section.
LP button type
The LP buckle type is found in the variable buckle joint. The buckle is usually short and the cusp angle is small. The diameter of the root of the male buckle is the same as that of the cylinder.
These are basically the more types of buckles that are encountered . Welcome everyone to add, contact information on the home page, a lot of exchange!