Compositional modeling of retrograde gas-condensate reservoirs in multimechanistic flow domains

Luis Ayala H., Turgay Ertekin, Michael A. Adewumi

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

A multimechanistic flow environment is the result of the combined action of a Darcian flow component (the macroscopic flow of the phase caused by pressure gradients) and a Fickian-like or diffusive flow component (diffusive flow caused by molecular concentration gradients) taking place in a hydrocarbon reservoir. The present work presents the framework needed for the assessment of the impact of multimechanistic flow on systems where complex fluid behavior - such as that of retrograde gas-condensate fluids - requires the implementation of compositional reservoir simulators. Because of the complex fluid behavior nature of gas-condensate fluids, a fully-implicit (IMPISC-type) compositional model is implemented and the model is used for the study of the isothermal depletion of naturally fractured retrograde gas reservoirs. In these systems, especially those tight systems with very low permeability (k<0.1 md), bulk fluid flow as predicted by Darcy's law might not take place despite the presence of large pressure gradients. The use of an effective diffusion coefficient in the gas phase - which accounts for the combined effect of the different diffusion mechanisms that could take place in a porous medium - and its relative contribution to fluid recovery are discussed. The compositional tracking capabilities of the model are tested, and the conditions where Fickian flow can be the major player in recovery predictions and considerably overcome the flow impairment to gas flow posed by the eventual appearance of a condensate barrier - typical of gas-condensate systems - are investigated. Finally, a mapping that defines different domains where multimechanistic flow can be expected in compositional simulators of retrograde gas-condensate reservoirs is presented.

Original languageEnglish (US)
Pages (from-to)480-487
Number of pages8
JournalSPE Journal
Volume11
Issue number4
DOIs
StatePublished - Jan 1 2006

Fingerprint

Gas condensates
gas condensate
Fluids
modeling
Pressure gradient
fluid
Simulators
Recovery
pressure gradient
Gases
simulator
Flow of gases
Porous materials
Flow of fluids
Hydrocarbons
Darcy law
hydrocarbon reservoir
condensate
gas flow
fluid flow

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

Ayala H., Luis ; Ertekin, Turgay ; Adewumi, Michael A. / Compositional modeling of retrograde gas-condensate reservoirs in multimechanistic flow domains. In: SPE Journal. 2006 ; Vol. 11, No. 4. pp. 480-487.
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Compositional modeling of retrograde gas-condensate reservoirs in multimechanistic flow domains. / Ayala H., Luis; Ertekin, Turgay; Adewumi, Michael A.

In: SPE Journal, Vol. 11, No. 4, 01.01.2006, p. 480-487.

Research output: Contribution to journalArticle

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