Petroleum and its derivatives supply a significant part of the world’s energy. Oil is used to produce electricity, to operate vehicles and for a number of other vital purposes. Global proven reserves of oil at the beginning of 2009 was1. 342 trillion barrels of which about 10 % is deep water – a little more than 100 billion barrels. Deep water drilling is the process of oil and gas exploration and production in depths of more than 500 feet. The deep water drilling system consists of the semisubmersible drill ship, riser and subsea hardware including the blowout preventer (BOP) stack and underwater work systems.
Deep water horizon contains perishable evidence and potentially stores pollutants, and as with many sunken ships this warrants a baseline survey and on-going monitoring. In order to justify the risks and expense of undertaking investigation, salvage other deep-water operations, it is important to identify what information is being sought and how this will improve our understanding of the event and future prevention. Unfortunately exploiting the earth’s petroleum resources can be difficult, and it has a serious environmental impact as oil reserves decrease, the disadvantages of drilling for oil increase.
In deep water, achieving the required objectives is more difficult. The key challenges are as follows: * Riser curvature and wear are increased * Buoyancy effectiveness is reduced * Mud pressure are increased * Collapse pressure are increased * Base/disconnect tension applied at BOP is increased * Hang-off deflection are increased * Running and retrieval takes longer Submitted To – Mentor – Dr Chandan Guria Submitted By – Ashish Joshi Adm. No. – 2011JE1154 2nd Year B. Tech Petroleum Engineering