Research On Condensate Oil Pollution In S Gas Field

As an unconventional oil and gas resource,condensate gas reservoir is rich in reserves and has attracted much attention.S gas field is a typical low permeability and low condensate oil-gas field,but it does not pay attention to the effect of condensate oil pollution and lack of accurate research.The purpose of this study is to use indoor physical simulation and software simulation auxiliary method to accurately test condensate content in S gas field,evaluate the degree of condensate pollution,determine the feasibility of condensate pollution relief,and evaluate the impact of retrograde condensate damage on key indicators of gas field development.It has important guiding significance for the follow-up development of the gas field.In this study,8 groups of stratigraphic fluids were obtained from the site for the high pressure physical properties of PVT.A typical stratigraphic fluid is prepared after the study of the high pressure physical properties of the formation fluid in the S gas field.Then 4 groups of simulated oil pollution experiments in near well area are carried out to evaluate the pollution degree of reverse condensate.Then 2 groups of experiments were carried out for the experimental group with serious condensate pollution to study the feasibility and effect of the release of condensate oil.Finally,the numerical simulation method is used to study the pollution of condensate oil and its influence on the subsequent development.The research results show that the content of condensate oil in S gas field is far higher than that in previous research.The average content of condensate is 31.97 g/m3.The results of condensate oil pollution experiment and numerical simulation show that,although the content of condensate oil is very low,the condensate oil pollution in the near well area is still in the presence of condensate oil.The effect of removing pollution can be achieved by using the measures of injection of methanol and dry gas.In this paper,the pollution degree of condensate oil in S gas field with low permeability and low condensate oil and its feasibility are studied,and the prediction and suggestion are made for the late development of gas field.which has important reference value for the development of this kind of gas field.