Many of the world’s reserves and potential reserves of hydrocarbons lie beneath the sea, and the oil and gas industry, trying to satisfy the growing demands of the market, during the history has developed technologies and techniques for finding and exploiting hydrocarbons in the often complex and challenging offshore conditions. There are different types of rigs for offshore drilling, some suitable for drilling in shallow waters (less than 500 ft) and others capable of drilling in deep waters (up to 12,000 ft). This thesis focuses on the jack ups, mobile offshore units consisting of a buoyant hull fitted with movable legs that allow the hull to be lifted over the sea level, in such a way to have a stable platform to carry out offshore drilling operations in waters depths up to more than 400 ft.