Pipe liners for corrosive high-temperature oil and gas production applications

Polyamide-11 has been used for more than 20 years as the chemical and pressure barrier in flexible pipes used in offshore oil and gas production. Recently, polyamide-11 has been used to line and protect carbon steel (CS) pipelines carrying corrosive sour raw gas and condensates. The liner was inserted in the field using three well-known installation techniques. If is being used successfully at temperatures that are not possible with conventional polyethylene liners. Until now, at temperatures above similar to 45 degrees C, only corrosion inhibition programs have proven to be effective in controlling the internal corrosion rates of CS pipes carrying sour raw gas. There is a total of similar to 10 km of polyamide-11 note installed in sir pipelines located in central and northwestern Alberta, Canada and in central France, operating at temperatures up to similar to 80 degrees C. The installations and the properties of exposed and aged polyamide-11 liner are discussed. The chemical resistance and mechanical properties of the polyamide-11 that make this application possible are discussed in detail.