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Gas-Condensate PVT Fluid Modeling Methodology Based on Limited Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE 2020 Annual Conference & Exhibition Online, Dec 2020, Volume 2020, p.1 - 5
Abstract
A well-established method for fluid characterization is to use regression on the critical parameters of the grouped components of an equation of state (EOS) to replicate the results of fluid experiments performed in the laboratory, mainly constant composition expansion (CCE), constant volume depletion (CVD), and differential liberation (DL). In the case of many mature reservoirs, however, proper fluid laboratory examination is not available. This paper proposes an alternative fluid characterization methodology based on the Engler distillation test (ASTM86). Its objective is to help engineers derive key fluid parameters such as formation volume factors and oil-gas ratios in the absence or limitation of PVT-cell experimental data, based only on the Engler distillation test (ASTM86) results and a fluid composition up to C5+.
The suggested methodology was applied on multiple highly heterogeneous fields located in the Dnieper-Donetsk Basin in Eastern Ukraine and proved to be useful for all the fields of varying fluid types ranging from lean gas with a condensate yield (presence of C5+ per cubic meter of gas) of 10 g/m3 to very rich retrograde gases of 500 g/m3.