SIMULATION MODELING OF BLOWDOWNS OF WELLS AND GAS GATHERING PIPELINES OF GAS-CONDENSATE FIELDS
DOI:
https://doi.org/10.31471/1993-9868-2025-1(43)-71-86Keywords:
gas-condensate field; modeling; flow; liquid; outflow velocity; flow rate.Abstract
Three-dimensional modelling of the physical process of a gas–liquid mixture leaking from a pipeline into the atmosphere was carried out under conditions corresponding to the actual parameters observed during the blowing of gathering pipelines and wells in gas and gas-condensate fields in Ukraine. In the Ansys R1 Student software environment, a three-dimensional model comprising zones of atmospheric and excess pressure was constructed. These were represented by a rectangular parallelepiped (with dimensions of 5 m by 3 m by 3 m) and a pipeline with an inner diameter of 77 mm and a length of 1 m, respectively. The VOF (Volume of Fluid) mathematical model, which is based on solving a system of mass conservation, momentum and volume fraction transport equations closed by a two-parameter k-ε turbulence model, was selected for the simulation. This model enables the prediction of multiphase flow dynamics with distinctly separated phases, as is typical when blowing down liquid with gas.Various values of excess pressure (0.10–0.35 MPa) and liquid volume fraction (α_l = 0.00–0.50) were assigned at the inlet boundary of the pipeline to perform the calculations. The outflow velocity, Mach number and gas flow rate were determined from the simulation results for each set of boundary input data. Additionally, to obtain comprehensive information on the effect of liquid on gas flow rate and for detailed analysis, the graphical interface of the Fluid Flow (Fluent) module was used to visualise velocity distribution contours and the liquid volume fraction along the 3D model of the pipeline and the atmospheric pressure zone. By examining the modelling results, the study identified regularities in the influence of the liquid phase on the gas flow rate during the pressurised outflow of a gas-liquid mixture from the pipeline into the atmosphere. It also revealed the primary factors leading to a reduced gas flow rate when the liquid volume fraction in the flow increases. It was confirmed that additional coefficients need to be developed and integrated into current gas loss calculation methodologies for blowing, in order to account for the presence of liquid in the gas flow.
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