Flexible Scaffolding Tube is one of the 2 km long, pipe diameter is 6 in the scaffolding tube, was shut down for corrosion problems. The scaffolding tube to after 5 ~ 6 home land owners, apply for to build a new scaffolding tube particularly difficult, therefore, decided to repair the pipes.

Wellstream company adopts the method of repair is a flexible steel pipe of the pipe before fitting it over to the old, so I can not need to apply to buy new pipe, greatly save the cost, and reduce the damage to the environment. The repair scaffolding tube is used to inject liquid carbon dioxide to the wellhead, in order to improve oil recovery.

Where to the mouth of the well, there are two 90 ° bend and a road through the area. Before pipe through homework after pigging, removal of obstacles such as elbow of the work.

Flexible steel has four layer structure, the inner layer is extrusion of thermoplastic pipe, plays a role of sealing in the transmission fluid. Between two layers of lining with polyethylene pipe is filled with carbon, it has the ability of long-term exposure to ultraviolet radiation resistance, and can eliminate external static electricity.

The most outer layer is the thick outer shield of extrusion, used to protect the bottom is not affected by the external pipe. Over the rated pressure flexible steel in accordance with ANSI classification, such as the grade 300 is equivalent to 5.15 MPa; Class 400 is equivalent to 6.89 MPa; Class 600 is equivalent to 10.3 MPa. The sea and the design principle of the flexible steel is 17 j, k and API RP 17 b.