Innovative drilling and completion technologies The oil and gas industry has developed fast in terms of drilling efficiency and cost savings in the 1990s. Some drilling milestones were quite notable at the end of the 20th century. Although we are performing significant progress, the enlargement of the world economy has given rise to escalating demands for petroleum, giving the energy industry new challenges. For example, how can we advance technologies to benefit more oil and gas resources with lower drilling costs? How can we improve the efficiency of drilling tools and operation safety on the basis of traditional drilling tools? These questions and challenges focus on drilling technologies and how to further improve the technology to better meet the energy demands of the world economy.