Go to the following and on the right side is a section entitled “in this section”. Click each section and you’ll find graphics of some of the equipment, etc. It gives you some prespective of the size of the equipment involved, the technical expertise, etc.
http://www.bp.com/sectiongenericarticle.do?categoryId=9033571&contentId=7061708
Ok next question...how do you all of a sudden make a turn while drilling?