Layer lottery with, drill that, for brevity, DST is called, is practical, which is usually petroleum engineers order to measure the difference in pressure column wells and also the difference in pressure of the well and the boundaries of the oil tank without the use of tools for doing it. Methods to is that in the first method, which progressive (buildup) is famous for the crater production wells to the pack and according to their charts the difference in pressure between the column of the well and the boundaries of the tank to obtain. And in the second method, the pressure drop (drawdown) is the famous open stream column of the well and measuring the changes of the well and based on the diagrams, the corresponding difference in pressure, the column wells, and the boundaries of the tank to obtain. Usually each how much difference high pressure is better and makes the well more time to production and continue with the Dubai Higher produce terminology drilling