David Whales has over 20 years experience as a Senior Drilling Engineer with several oil majors and large service companies. Much of his experience has been with the more technically challenging operations, including; underbalanced drilling, through tubing drilling and high temperature high pressure drilling. In the past few year David has added abandonment operations to his portfolio of skills while working on the decommissioning of the UK’s Heather and Thistle platforms. More recently, he has been focused on the testing of alternative abandonment technologies in the low-cost land environment. This experience has given him a good understanding of not only the detailed technical issues that need to be resolved to achieve a successful abandonment but also the overarching project issues that allow significant cost reductions to be achieved.