Internal or external corrosion of tubings
Internal or external tubing corrosion with the presence of water is a common problem during the life of the well. (The same goes for casing corrosion). Most oil and gas production involves co-produced water, making corroded tubings a pervasive issue across the oil and gas industry.
Moreover, age and the presence of corrosive materials such as carbon dioxide (CO2) and hydrogen sulfide (H2S) can exacerbate the problem.
The inevitable exposure to production fluids can compromise the integrity of a tubing string. Either through mechanical fatigue, heat dilatation, or corrosion, a leak can appear. For tubing sizes 4-1/2 to 13-3/8in, Saltel Xpandable Steel Patch can be run to repair corroded tubings (once installed the Patch given internal and external differential pressure rating vary depending on whether it is supported or not). Running a tubing Patch eliminates the need to pull out the completion string, and minimizes the non-productive time involved with a full workover operation.
Saltel Xpandable Patch is an excellent inner lining alternative for repairing corroded or eroded tubings, should they be even twisted, burst or bent.
The Patch seals the corroded zone, ensuring maximum nominal and drift ID after setting. Saltel Patch provides effective sealing, even in out of gauge or worn tubings. Here the Patch sealing efficiency logically depends on the level of corrosion, and the elastomer skin thickness.
See also Tubing repair