What is Oilfield cement, is it the same as the cement that cars drive on?
I have never worked in the Oil Patch, but I believe oilfield cement is a mixture of sand, aggregate and a barium compound (barium carbonate, maybe). If you look at the Periodic Table, you will see that barium lies under calcium, and has the same properties (more or less). Since barium is denser, when an over-pressured oil reservoir is breached, this mixture plugs up the drill hole until the well can be capped. This is a major use of the element barium.
