Revaporization of Butane and Pentane from Sand

Abstract

A STUDY of the behavior of retrograde condensation from gas mixtures was made in the presence and absence of sand in order to determine if the condensed liquid would revaporize in the presence of sand. Methanebutane and methane-pentane mixtures that would form liquids by retrograde condensation when produced from a constant volume cell were used.The methane-butane mixtures of similar composition were produced by three different methods. The first two were charged into an empty cell and were produced in one case within a period of 9 hr and in the other within a period of 3 days. The third mixture was charged to a sand-packed cell and produced within a period of 9 hr. The curves relating composition of the produced gas to pressure obtained from these experiments show that equilibrium was maintained as long as liquid was condensing. However, during the portion of the pressure decline where the condensed liquid should be revaporizing, equilibrium was maintained only when the mixture was produced from the sand-packed cell.The methane-pentane mixture is produced only in the presence of sand. The data obtained for this system also show that equilibrium is maintained at all times during the pressure decline.These results indicate that revaporization is aided rather than prevented by the fact that the condensate" wets the sand."

Characteristics and quantitative study on gas breakthrough in developing Yaha-2 condensate gas reservoir in Tarim Basin, China

“…Standing et al (1948) found that all the condensate oil can be extracted as long as the injected dry gas is enough. Weinaug and Cordell (1948) conducted some experiments and found that if the injected dry gas is enough, the condensate oil would enter the gas phase by reverse evaporation. Abel et al (1970) observed that the higher the injection pressure is, the higher the recovery of condensate oil will be.…”