Evaluating reservoir production strategies in miscible and immiscible gas-injection projects

Iman Farzad, Mahmood Amani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Successful design and implementation of a miscible gas injection project depends upon the minimum miscibility pressure (MMP) and other factors such as reservoir and fluid characterization. The experimental methods available for determining MMP are both costly and time consuming. Therefore, the use of correlations that prove to be reliable for a wide range of fluid types would likely be considered acceptable for preliminary screening studies. This work includes a comparative evaluation of MMP correlations and thermodynamic models using an equation of state by PVTsim1 software. We observed that none of the evaluated MMP correlations studied in this investigation is sufficiently reliable. EOS-based analytical methods seemed to be more conservative in predicting MMP values. Following an acceptable estimate of MMP, several compositional simulation runs were conducted to determine the sensitivity of the oil recovery to variations in injection pressure (at pressures above, equal to and below the estimated MMP), stratification and mobility ratio parameters in miscible and immiscible gas injection projects. Simulation results indicated that injection pressure was a key parameter that affects oil recovery to a high degree. MMP determined to be the optimum injection pressure. Stratification and mobility ratio could also affect the recovery efficiency of the reservoir in a variety of ways.

Original languageEnglish
Title of host publicationSPE Latin American and Caribbean Petroleum Engineering Conference
Pages1365-1380
Number of pages16
Volume3
Publication statusPublished - 2007
Externally publishedYes
EventSPE 10th Latin American and Caribbean Petroleum Engineering Conference, X LACPEC 07 - Buenos Aires, Argentina
Duration: 15 Apr 200718 Apr 2007

Other

OtherSPE 10th Latin American and Caribbean Petroleum Engineering Conference, X LACPEC 07
CountryArgentina
CityBuenos Aires
Period15/4/0718/4/07

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ASJC Scopus subject areas

  • Geology

Cite this

Farzad, I., & Amani, M. (2007). Evaluating reservoir production strategies in miscible and immiscible gas-injection projects. In SPE Latin American and Caribbean Petroleum Engineering Conference (Vol. 3, pp. 1365-1380)