Oil and gas operators have to cope with the unstable crude oil price. Meeting high income expectations means optimizing the production. Oil and gas wells have to produce more and more, to ensure better profits from initial investments, and capitalize on the best production from the existing wells. As long as oil & gas operators need to have their wells producing better and longer, optimizing the production is essential. Moreover, leaking casings or tubings due to corrosion, leaking connections usually occur in the life of young and mature wells. Leaks can have a strong impact on the production. If numerous production optimization techniques have come out to the market these recent years, our expandable steel patch is currently growing worldwide and meets numerous expectations from downhole technical challenges: Irregular boreholes, HPHT, short lengths, sealing insurance, and well integrity.