Casing coupling is a short pipe applied in connecting two casing pipes which have threads. The pipe coupling has internal threads machined to match the external thread of the long joints of casing. The two joints of casing pipes are screwed into opposite ends of the casing coupling. Through their strength can be normally made of the same grade of steel as the casing. All casing couplings are manufactured in accordance with API 5CT specification of the latest edition.

Tubing coupling is a kind of drilling tool available in oil field. Tubing couplings are mainly used in connecting oil pipes. This type of pipe coupling has handled the problem that the existing couplings tend to crack because of stress concentration. The oil pipe ends and the inner wall of the tubing coupling are connected by threads. And the oil pipes and the ends of the tubing coupling have the same type of threads. It is not easy to crack for this type of connection and the connection effect is good. The tubing coupling can avoid the oil well string dropout accident effectively.

Standard

API 5CT and 5B

Grade

PSL1/PSL2 J55,K55,N80-1,N80-Q, L80-1 ,C90, C95,T95, P110, Q125, 1CR, 3CR, 9CR, 13CR, Super13CR etc.

Size

Tubing Coupling: 1.9"- 4-1/2"

Casing Couping: 4-1/2"- 13-3/8" 

Surface: Whole Phosphating or Inside Phosphating and Outside Coating

Thread: NUE, EUE, VAM, STC, LTC, BTC, XC, VAM TOP, NEW VAM, HYDRILL CS

Manufacturing Process of Tubing and Casing Coupling