Prediction of the pressure under which a gasser is inactive

In this paper, a prediction method of the gas well flow-stop pressure is put forward. Using Qsc, (the production of the gas well ) and according to the gas well productivity equation, when calculation of gas production is Qsc and the formation pressure is PR (when bottom hole flowing pressure is Pwf), PR is natural flow-stop pressure by the gas well in a given tubing size, water cut, and the minimum wellhead back pressure. The result shows that the gas well shaft pressure loss increases when water/gas ratio increases. In the use of large-sized pipeline, the well bore pressure loss decreases slightly, but flux obviously increases. Using the energy, reducing natural flow-stop pressure of the gas well, extending as far as possible the flowing time, and when choosing the tubing size considering the single well production, water-cut and pressure deviation when choosing the tubing size. Using combination tubing and reducing as far as possible wellhead back pressure.