Basic well construction--the base process of casing and cementing has not changed since oil and gas production started in Alberta with Leduc. What has changed is that the technologies and the cements and the materials used have improved greatly. So in modern wells, we're very confident in the cement jobs we have. We have methods of assessing the cement jobs using things like rods and stuff. So although the basic construction has not changed much, the quality of the construction has improved significantly, particularly over the last 20 to 30 years.
On May 8th, 2007. See this statement in context.