科研之友
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摘要
Sampling process is one of the important tasks in petroleum engineering which is used to specify the fluid type and estimate PVT characteristics. Moreover, to perform geochemical and crude oil analyses, enough volume of fluid is required. To obtain a representative reservoir fluid, sampling should be preferably done at the beginning of the reservoir life i.e., prior to reaching saturation pressure. Above the saturation, the presence of free gas in the oil layer is less probable and the representative reservoir fluid can be acquired. In this study, we propose a detailed step-by-step procedure for the fluid sampling process. According to temperature and pressure conditions at each step, one or more oil or gas properties have been calculated appropriately. Since the down-hole sampling cannot provide sufficient volume for PVT analysis and other fluid calculations, the surface sampling and recombination processes are of great importance. To validate and justify the proposed procedures, we studied a surface recombination process on a volatile reservoir fluid from an oil field in the Middle East. The results indicate reasonable agreements between recombined fluid properties and reservoir fluid properties obtained from routine analysis. The error of 3.2 % has been observed in saturation pressure values compared with the down-hole reservoir fluid.
- 出版日期2014-12
