Simulation of asphaltene precipitation during gas injection using PC-SAFT EOS

Saeedeh Mohebbinia, Kamy Sepehrnoori, Russell Taylor Johns, Aboulghasem Kazemi Nia Korrani

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Oilfield problems owing to asphaltene precipitation are well known. Asphaltenes can block pore throats or change the formation wettability and thereby reduce the hydrocarbon mobility. Simulation of asphaltene precipitation during gas injection requires a comprehensive thermodynamic model, which accounts for the complex phase behavior of asphaltenes. In this paper, PC-SAFT EOS is implemented for the first time in a compositional reservoir simulator to model asphaltene precipitation. The additional computational time of PC-SAFT compared to the cubic equations-of-state such as Pen-Robinson (PR EOS) is decreased by improving its root finding algorithm. A deposition and wettability alteration model is then integrated with the thermodynamic model to simulate the dynamics of precipitated asphaltenes. Different gas injection scenarios are modeled to show the effect of gas injection on apshaltene precipitation and deposition. Simulation results show that the profile of the damaged area by asphaltene deposition is governed by the shape of the asphaltene precipitation envelope for the reservoir fluid. The damage caused by asphaltene deposition, through plugging and wettability alteration, was revealed as a decline in productivity index curves. Results indicate that a reservoir fluid can have precipitation risk during gas injection even if it does not exhibit precipitation in the primary recovery life of a field. The computational time of the simulations using PC-SAFT EOS were compared to those using PR EOS for different number of components. Results of these comparisons show the feasibility of using PC-SAFT in compositional simulations.

Original languageEnglish (US)
Pages (from-to)693-706
Number of pages14
JournalJournal of Petroleum Science and Engineering
Volume158
DOIs
StatePublished - Sep 1 2017

Fingerprint

asphaltene
EOS
Asphaltenes
Wetting
wettability
gas
simulation
Thermodynamics
Fluids
Phase behavior
thermodynamics
Equations of state
fluid
Simulators
Productivity
Hydrocarbons
equation of state
Recovery
simulator
hydrocarbon

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

Mohebbinia, Saeedeh ; Sepehrnoori, Kamy ; Johns, Russell Taylor ; Kazemi Nia Korrani, Aboulghasem. / Simulation of asphaltene precipitation during gas injection using PC-SAFT EOS. In: Journal of Petroleum Science and Engineering. 2017 ; Vol. 158. pp. 693-706.
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Simulation of asphaltene precipitation during gas injection using PC-SAFT EOS. / Mohebbinia, Saeedeh; Sepehrnoori, Kamy; Johns, Russell Taylor; Kazemi Nia Korrani, Aboulghasem.

In: Journal of Petroleum Science and Engineering, Vol. 158, 01.09.2017, p. 693-706.

Research output: Contribution to journalArticle

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