Description
About Tubing coupling
Normally tubing coupling OD maximum is 4 1/2”, as the tubing pipe is applied for the drilling activities (Inside the tubing is the sucker rod to drill/pump the oil), couplings type is more various and rigorous than casing, mostly used is thicken type upset coupling (Internal upset and external upset), for short is EUE coupling, it is the most favorable in tubing connections. Tubing with EU end (EUE) coupling connection also called UPTBG. Because of the end of the tubing is thickened (upset), the connecting stress is better than buttress coupling.
Buttress coupling another type used for tubing connections, it has the same thickness of the pipe body, called NU end (NUE)tubing or TBG.
Features
The oil tubing coupling can solve the problem of fatigue fracture in the existing coupling due to stress concentration. Oil tubing end is connected to the inside wall of the coupling in a tapered thread. The coupling body end and oil tubing are connected with same thread pitch flat thread. The coupling is not easy to produce fatigue fracture, and has good connection effect. It can prevent the accident of oil well pipe string break effectively.
About Casing coupling
Casing coupling is for the dimensions more than 4 1/2 inch. Differently than tubing coupling is, casing coupling normally does not need to be thickened (Non-upset), which means no upset casing coupling, so it has following types:
• BTC: Buttress coupling
• LTC: Long buttress coupling
• STC: Short buttress coupling
All three types has same thickness of the casing pipe body, just have different lengths.
The oil casing coupling is a necessary piece used to connect the two casing. The coupling manufacturing method is the same as seamless pipe. The steel pipe ends with internal thread to connect with the upper and lower casing. In order to ensure the joint tightness, the precision of screw thread is strictly required.
Seamless and ERW Casing
Specification | API 5CT |
Grades | K55, N80, L80, C95, P110, Chrome, J55(Modified), J55 (API), PS80 |
Special Grades | For sour services and for deep well with high collapse properties |
Dimensions | OD 4" - 26" WT - 0.2 -0.5" |
Length range | 1, 2 or 3 |
Thread connections | API (STC and LTC), BTC, extreme line, etc. |
Seamless and ERW Tubing
Specification | API 5CT |
Grades | J55 (API) J55(Modified), N80, L80, L80 13Cr, P110, Q125, H40 (API) |
Thread connections | API 5B - Last Edition or Premium, EUE, NUE, special seal, metal-to-metal seal and VAGT |
Specification
Casing Couplings Short Thread Specifications:
Casing Couplings
Short Thread | Casing Size OD (inches) | Coupling Size OD (inches) | Length (inches) | Weight per Coupling (lbs) | Palletized Carton Quantity |
 | 4-1/2 | 5.000 | 6.250 | 8.05 | 343 |
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Warehouse Storage
Shandong Juhuo Special Steel Co., Ltd. is a comprehensive enterpriseintegrating steel
supply and processing. The company has a large inventory of metal materials
such as stainless steel, galvanized, profiles, aluminum.copper, lead, etc, which can
meet the needs of customers in different fields.The company has strong strength and
has a professional team with excellent technology and rich
experience.The company has also introduced advanced production equipment
and processing technology, which can provide customers with steel products of various
specifications and processing requirements.
Customer conversation
We provide the products consultation , purchase plan suggestion , logistic service (
including the shipment service , custom works ,etc ).
Application field
Taking technology as the guide, quality as the guarantee, and service as the purpose,
the company actively explores the market, expands the scale of operation, and
constantly improves enterprise management to ensure product quality and service
quality.
