The inflow performance of a well represents the ability of that well to give up fluids. This ability depends to a great extent upon the type of reservoir and drive mechanism, and such variables as reservoir pressure, permeability, etc. It is common practice to assume that inflow into a particular well with constant conditions is directionally proportional to average reservoir pressure. When this pressure decline, the well is not able to flow by itself and it is necessary to used a properly artificial lift method. In many cases, sucker rod pumping is the method used. Some times, the dynamometer registers shows that the well is flowing by itself and at the same time the sucker rod beam is pumping, and as soon as the operator stop de sucker rod beam, the production quickly ceases till de sucker rod start again, but still without any sign of pumping action. But flumping is a combination of flowing and pumping, and it is when a well that is being pumped through the tubing is flowing at the same time from de casing tubing annulus. There is no question here of a dual completion, and both the annulus and the tubing production come from the same horizon. Many wells today are flumping, and this condition is generally fortuitous and no conscious effort has been made to bring it about. It is therefore worth inquiring into the nature of flumping to be able the engineers achieve a production method to be applied in certain types of well. This method used is to suppose the oil production, to know the pump efficiency, calculate the production curve in the annulus, and define the vertical flow condition that may be possible the combination of flowing by the annulus and pumping in the tubing production.