The Pollution Research Of Retrograde Condensation In Field Of Qiudong-Wenba

In development process of gas condensate field, the phenomenon of retrograde condensate will happen when the sand face pressure is reduced to the dew point pressure. The condensate oil began to flow to the bottom, when the saturation of condensate oil gather than the critical of the saturation of condensate oil. The growth of condensate oil reduces the gas flow effective pore space, reduced the relative permeability gas phase, this is the pollution of retrograde condensate of gas condensate Wells. Pollution of not only harm the production of gas well capacity, also can cause the loss of heavy constituent.This paper established and solution the equation of the condensate gas supply what describe from the border to the bottom of the well.The dynamic, from gas supply capacity border to the pressure and flow process bottom phase, gas parameters such as relative permeability is calculated and analyzed according to the actual data of QD7 and W8-1.Get out the conclusion of that the condensate gas reservoir influences of pollution itself less than the influences of retrograde condensate.This article starting with retrograde condensate pollution affects scope and mode, and put forward treatment measure of retrograde condensate pollution.