Enhancing production with natural gas ejector for Hai Thach gas condensate field - CFD model development
Abstract
In the field of gas and condensate production, the processing of fluid flowing depends on the reservoir pressure and the inlet pressure
of the gas processing system. In order to recover gas and condensate from the depleting or pressure-reducing wells at the same time with wells still maintaining stable flowrate and pressure, conventionally the methods of using surface equipment are often studied to evaluate their technical feasibility as well as economic efficiency. Two conventional methods using surface equipment are Three-phase Natural Gas Compressor and Ejector. Compared to the Gas Compressor, the method using Ejector offers many advantages such as low investment and operating costs, and this is also a lightweight, reliable and environmental-friendly equipment. However, to support investment decision making, a reliable fluid dynamic model is crucial to analyse the workability and performance as well as to accurately calculate the increase of enhanced recovery products.
In this study, the results of the Computational Fluid Dynamic (CFD) model using a gas mixture were also compared to those produced by the equivalent model using only methane. The flowing of fluids inside the Ejector is modelled based on the k-ε Re-Normalisation Group (k-ε RNG) turbulent model. The gas compositions for working fluids are those under the conditions of Hai Thach field. The Peng-Robison real gas equation was also applied to calculate the gas density.
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