Coiled tubing is a kind of joint length up to thousands of meters and can implement many times repeated bending, the plastic deformation of the new type of oil pipes. Coiled tubing and its operation and equipment is called the "universal rig", such as the United States, Canada and other countries abroad, coiled tubing has become a essential oil in the oil field operation and equipment. The coiled tubing is 9000 m long, the longest of this special tubing manufacturing core technology is:

1, chemical elements,

Due to the severe service environment, mechanical properties and corrosion resistance of coiled tubing materials have higher requirements, to the optimization design on the material of the chemical composition, must also be on smelting and rolling achieve full flow josic purification control, minimize the inclusion content of harmful elements such as and S, P.

2, processing

Due to reasons such as dislocation multiplication effect of work hardening and BaoShen after combination, controlled transformation regularity of pipe body strength.

3, heat treatment,

Through the process pipe body, realize the organization and performance of the optimal control, especially in high strength and high plasticity and low residual stress.

4, the welding technology

In low carbon alloy steel, mainly USES the HFW welding technology, need to study the optimum parameters of the welding process (such as current, voltage, frequency, welding speed, forming Angle, extrusion, etc.), the research of weld and weld heat treatment technology.

5, plate butt

To achieve continuous production of welded HFW must first plate extension, the plate butt adopts methods such as TIG, MAG and plasma welding. Are research methods is the friction stir welding method.

6, pipe butt

Coiled tubing is in use process may cause local damage, injury or defect part must be removed, and through the connecting pipe welding. The traditional docking method generally USES the manual TIG welding, welding quality is hard to control, make the automatic welding technology at present.

7, the new technology of manufacturing

Such as CVR technology, that is, using the same specifications of the tube billet continuous tube, online by medium frequency induction heated to 940 ℃, through the thermal mechanical rolling, on the one hand, optimized HFW seam or seamless, on the other hand to achieve the thickness or diameter. In addition, there are special stainless steel tube continuous laser welding technology and so on.