PHYSICAL AND MATHEMATICAL MODEL AND CALCULATION METHOD FOR TWO-PHASE FLOW OF A GAS-CONDENSATE MIXTURE IN A GATHERING PIPELINE SYSTEM

Vollständiger Abstract

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This paper proposes a physical and mathematical model of two-phase gas condensate flow in a pipeline system. The presented model is characterized by a comprehensive description of hydraulic and thermal losses. An algorithm for numerically solving the system of the proposed model equations is described. The model was tested using a section of a gas gathering system (GGS) at a large gas condensate field. It is shown that the developed model has a high degree of convergence in terms of pressure and temperature drop across the section of the GGS.The variation of parameters along the pipeline length was studied. Analysis of the dynamics of the system's key physical parameters confirms the validity of the proposed model and numerical algorithms. Continuous phase transitions are observed as the gas condensate mixture moves through the pipeline. Using one operating regime as an example, it is shown that the mass fraction of the liquid phase in the pipeline cross-section changes from 0.233 to 0.261 fractional units.