Research On Rational Development Mode Of Abnormally High Pressure Fractured Condensate Gas Reservoir

In this paper,according to the characteristics of abnormally high-pressure fractured condensate gas reservoirs with high original formation pressure and natural fractures in the reservoir.Firstly,high-pressure physical property experiments of condensate gas reservoirs are carried out.type characteristics.Secondly,the research on reverse condensate damage was carried out,and the temporal and spatial distribution of condensate saturation and the relationship between gas well allocation and reverse condensate damage were obtained.Then,according to the mechanism that affects the effect of cyclic gas injection and the influencing factors of the mechanism of cyclic gas injection,seven development methods of cyclic gas injection are proposed,and the production enhancement effects of various methods are compared.Finally,the ability of depletion,cyclic gas injection and CO₂ injection to improve the recovery of condensate oil is compared,and a reasonable development method suitable for abnormally high pressure fractured condensate gas reservoirs is obtained.The results of high-pressure physical property experiments show that the dew point pressure of the condensate gas reservoir in block B is 53.41MPa,the maximum reverse condensate volume is 2.71%,and the condensate oil content is 107.183g/m³.The ground dew pressure difference is large,and the amount of reverse condensate is low,which is a condensate gas reservoir with medium liquid hydrocarbon content.The research results of reverse condensate damage show that the condensate oil saturation in the matrix pores and fractures in the near-wellbore zone is much higher than that in the far-well zone,and the condensate oil saturation in the fractures in the near-wellbore zone is higher than that in the matrix pores.saturation.With the increase of production time,the condensate oil saturation in the matrix pores and fractures in the near-wellbore zone gradually increased,and then decreased slightly and stabilized,and the condensate oil saturation in the far-wellbore zone increased slightly.The larger the allocation,the more serious the damage of reverse condensation.The research results of cyclic gas injection show that there are two methods,the synchronous cycle switching well development of injection and production wells and the asynchronous cycle switching well development of injection and production wells,which also take into account whether the injection and production wells are synchronous and the working system of injection and production wells.These two factors,thereby increasing the oil-gas contact time and expanding the range of injection-production pressure fluctuations,can maximize the condensate recovery and reduce the gas-oil ratio.The numerical simulation results of block B model show that,for abnormally high pressure fractured condensate gas reservoirs,compared with depletion development,depletion and cyclic gas injection development or depletion and CO₂ injection development can maintain formation pressure or reduce it slowly,and attenuate the decrease in daily oil production and the increase in gas-oil ratio.Among them,the recovery rate of condensate oil developed by depletion and cyclic gas injection is higher.