SYSTEMS AND PROCESSES FOR COATING AND LINING COILED TUBING

摘要

In a process for coating the exterior surface of coiled tubing, the coiled tubing is passed through: a surface preparation stage; an adhesive application stage; an extrusion stage (in which the coiled tubing is passed through a die in conjunction with a flow of melted coating material); and a cooling (or coating solidification) stage. In a process for lining coiled tubing, a tubular liner made from a selected elastically-deformable material, and having an outer diameter larger than the coiled tubing bore, is fed through rollers or dies to elastically deform the liner radially to reduce its outer diameter to less than the coiled tubing bore diameter. The radially-deformed liner is inserted into the coiled tubing and then allowed to elastically rebound radially, such that the liner's outer surface is urged into contact with the inner surface of the coiled tubing bore.