FIELD: oil and gas industry.
SUBSTANCE: invention relates to the oil and gas industry, particularly to the methods of designing the development of the gas-condensate fields (GCF) with the high content of the condensed fluid in the native gas (NG). For this purpose, in developing GCF, the exchanged gas sample of the initial composition is created in the chamber pVT, at the formation conditions. The staged modeling of the GCF developing process is performed in mode of exhaustion by differential condensation (DC) due to gas bleeding from the chamber pVT. The volume and mass of the separating gas, bumping and degasified condensate are determined. Sampling with the following calculating the NG density for each developing stage and forecast of changes in the NG density is performed by use of the analytic relationship. For each DC stage and after creating the thermobaric conditions, the mass of loaded NG, mass of NG bled from the chamber pVT, and the mass of NG escaped as the wet gas condensate, are determined. The mass of the NG left in the chamber pVT is calculated at each stage by using the balance method. At that, the NG density at the initial formation conditions is determined by the specified relations. The volume and mass of the NG conditioned to the standards, and loaded into the chamber pVT, density of the NG conditioned to the standards for the current formation pressure, volume of the NG in the chamber pVT at the current developing stage and conditioned to standards, NG density for the current formation pressures at formation conditions, the volume of the chamber pVT taken by the residue NG in gas phase at the current formation pressure, the volume of the chamber pVT taken by the NG at the initial formation pressure and the volume of the retrograde wet gas condensate precipitated in the chamber pVT at the current formation pressure are determined by specified relationships, and the change in NG density in GCF developing is forecasted at standard and formation conditions.
EFFECT: simplification of method for designing gas-condensate formation development, research time reduction and increased precision.
1 dwg, 6 tbl, 1 ex
