Very good explanatory video, about Reciprocating the Casing during cementing. Its function is to eliminate sludge in the walls of the well and generate a better adhesion (Bond) of the cement and avoid micro rings (Communication). In other operations they use a CRT, to rotate and reciprocate the casing (TR) before cementing, to fulfill the aforementioned function. It is a very risky operation, as this video shows. All workers here must have 1000 eyes, to avoid an accident. Watch more videos on ou