I am very familiar with oilfield chemical pumps. I used to be a chemical man. The only time they would use a pump like we use would be on a chemical delivery truck of for transferring from a bulk tank into a day tank. Most olifield chemical pumps have to be adjustable in order to meter dosing. Its hard to go that with a centrifugal pump. They mainly use piston or diaphramn pumps. As I think you were mentioning they sometimes use peristaltic pumps.

They are mainly used for low volume, low pressure applications. The good thing about them is that you don't have to worry about contamination. All you have to do is change out the tygon tubing.