Gas/oil nonequilibrium in multicontact miscible displacements within homogeneous porous media

Y. M. Al-Wahaibi, A. H. Muggeridge, C. A. Grattoni

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

5 Citations (Scopus)

Abstract

Compositional simulation is usually used to predict the performance of multi-contact miscible (MCM) recovery schemes. One key assumption in most such simulations is that of instantaneous compositional equilibrium is achieved between phases in each grid block. This is despite the fact that most grid blocks are tens of metres long and at least a metre thick. This paper investigates the non-equilibrium observed in series of multi-contact miscible displacements performed in the laboratory. For simplicity a two-phase, three-component (IPA/water/cyclohexene) liquid system that exhibits an upper critical point at ambient conditions was used. Both vaporising and condensing drives were performed in well-characterised homogenous glass-bead packs. The use of analogue fluids and bead-packs enabled visualisation of the displacements as well as the usual measurements of effluent composition against time and recovery. Non-equilibrium was observed in the effluent from both the condensing and vaporising experiments. This increased with flow-rate but appeared to be independent of the permeability and the length of the bead-pack. Further experiments investigating the influence of gravity on vertical displacements indicated that non-equilibrium may also be a function of the viscous to gravity ratio. Detailed simulation using a commercial compositional simulator was unable to predict this non-equilibrium unless the results were tuned to the experimental observed effluent profiles using alpha factors. This is despite the fact that all PVT data, relative permeabilities and other pack properties were taken directly from experiments. However good match was obtained from a layered model with the permeability distribution obtained from a unit mobility ratio miscible displacement in the same pack. These results are consistent with physical dispersion being the underlying cause of the non-equilibrium. Viscous fingering is discounted due to the low mobility ratio (∼2) of the displacements.

Original languageEnglish
Title of host publicationProceedings - SPE Symposium on Improved Oil Recovery
Pages610-631
Number of pages22
Volume2
Publication statusPublished - 2006
Event15th SPE-DOE Improved Oil Recovery Symposium: Old Reservoirs New Tricks A Global Perspective - Tulsa, OK, United States
Duration: Apr 22 2006Apr 26 2006

Other

Other15th SPE-DOE Improved Oil Recovery Symposium: Old Reservoirs New Tricks A Global Perspective
CountryUnited States
CityTulsa, OK
Period4/22/064/26/06

Fingerprint

Gas oils
Porous materials
porous medium
Effluents
Vaporization
oil
Gravitation
gas
Recovery
permeability
effluent
Experiments
gravity
simulation
fingering
Visualization
Simulators
Flow rate
experiment
Glass

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

Al-Wahaibi, Y. M., Muggeridge, A. H., & Grattoni, C. A. (2006). Gas/oil nonequilibrium in multicontact miscible displacements within homogeneous porous media. In Proceedings - SPE Symposium on Improved Oil Recovery (Vol. 2, pp. 610-631)

Gas/oil nonequilibrium in multicontact miscible displacements within homogeneous porous media. / Al-Wahaibi, Y. M.; Muggeridge, A. H.; Grattoni, C. A.

Proceedings - SPE Symposium on Improved Oil Recovery. Vol. 2 2006. p. 610-631.

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

Al-Wahaibi, YM, Muggeridge, AH & Grattoni, CA 2006, Gas/oil nonequilibrium in multicontact miscible displacements within homogeneous porous media. in Proceedings - SPE Symposium on Improved Oil Recovery. vol. 2, pp. 610-631, 15th SPE-DOE Improved Oil Recovery Symposium: Old Reservoirs New Tricks A Global Perspective, Tulsa, OK, United States, 4/22/06.
Al-Wahaibi YM, Muggeridge AH, Grattoni CA. Gas/oil nonequilibrium in multicontact miscible displacements within homogeneous porous media. In Proceedings - SPE Symposium on Improved Oil Recovery. Vol. 2. 2006. p. 610-631
Al-Wahaibi, Y. M. ; Muggeridge, A. H. ; Grattoni, C. A. / Gas/oil nonequilibrium in multicontact miscible displacements within homogeneous porous media. Proceedings - SPE Symposium on Improved Oil Recovery. Vol. 2 2006. pp. 610-631
@inproceedings{5426c2ba2fa943f4be66e46020e8edf1,
title = "Gas/oil nonequilibrium in multicontact miscible displacements within homogeneous porous media",
abstract = "Compositional simulation is usually used to predict the performance of multi-contact miscible (MCM) recovery schemes. One key assumption in most such simulations is that of instantaneous compositional equilibrium is achieved between phases in each grid block. This is despite the fact that most grid blocks are tens of metres long and at least a metre thick. This paper investigates the non-equilibrium observed in series of multi-contact miscible displacements performed in the laboratory. For simplicity a two-phase, three-component (IPA/water/cyclohexene) liquid system that exhibits an upper critical point at ambient conditions was used. Both vaporising and condensing drives were performed in well-characterised homogenous glass-bead packs. The use of analogue fluids and bead-packs enabled visualisation of the displacements as well as the usual measurements of effluent composition against time and recovery. Non-equilibrium was observed in the effluent from both the condensing and vaporising experiments. This increased with flow-rate but appeared to be independent of the permeability and the length of the bead-pack. Further experiments investigating the influence of gravity on vertical displacements indicated that non-equilibrium may also be a function of the viscous to gravity ratio. Detailed simulation using a commercial compositional simulator was unable to predict this non-equilibrium unless the results were tuned to the experimental observed effluent profiles using alpha factors. This is despite the fact that all PVT data, relative permeabilities and other pack properties were taken directly from experiments. However good match was obtained from a layered model with the permeability distribution obtained from a unit mobility ratio miscible displacement in the same pack. These results are consistent with physical dispersion being the underlying cause of the non-equilibrium. Viscous fingering is discounted due to the low mobility ratio (∼2) of the displacements.",
author = "Al-Wahaibi, {Y. M.} and Muggeridge, {A. H.} and Grattoni, {C. A.}",
year = "2006",
language = "English",
volume = "2",
pages = "610--631",
booktitle = "Proceedings - SPE Symposium on Improved Oil Recovery",

}

TY - GEN

T1 - Gas/oil nonequilibrium in multicontact miscible displacements within homogeneous porous media

AU - Al-Wahaibi, Y. M.

AU - Muggeridge, A. H.

AU - Grattoni, C. A.

PY - 2006

Y1 - 2006

N2 - Compositional simulation is usually used to predict the performance of multi-contact miscible (MCM) recovery schemes. One key assumption in most such simulations is that of instantaneous compositional equilibrium is achieved between phases in each grid block. This is despite the fact that most grid blocks are tens of metres long and at least a metre thick. This paper investigates the non-equilibrium observed in series of multi-contact miscible displacements performed in the laboratory. For simplicity a two-phase, three-component (IPA/water/cyclohexene) liquid system that exhibits an upper critical point at ambient conditions was used. Both vaporising and condensing drives were performed in well-characterised homogenous glass-bead packs. The use of analogue fluids and bead-packs enabled visualisation of the displacements as well as the usual measurements of effluent composition against time and recovery. Non-equilibrium was observed in the effluent from both the condensing and vaporising experiments. This increased with flow-rate but appeared to be independent of the permeability and the length of the bead-pack. Further experiments investigating the influence of gravity on vertical displacements indicated that non-equilibrium may also be a function of the viscous to gravity ratio. Detailed simulation using a commercial compositional simulator was unable to predict this non-equilibrium unless the results were tuned to the experimental observed effluent profiles using alpha factors. This is despite the fact that all PVT data, relative permeabilities and other pack properties were taken directly from experiments. However good match was obtained from a layered model with the permeability distribution obtained from a unit mobility ratio miscible displacement in the same pack. These results are consistent with physical dispersion being the underlying cause of the non-equilibrium. Viscous fingering is discounted due to the low mobility ratio (∼2) of the displacements.

AB - Compositional simulation is usually used to predict the performance of multi-contact miscible (MCM) recovery schemes. One key assumption in most such simulations is that of instantaneous compositional equilibrium is achieved between phases in each grid block. This is despite the fact that most grid blocks are tens of metres long and at least a metre thick. This paper investigates the non-equilibrium observed in series of multi-contact miscible displacements performed in the laboratory. For simplicity a two-phase, three-component (IPA/water/cyclohexene) liquid system that exhibits an upper critical point at ambient conditions was used. Both vaporising and condensing drives were performed in well-characterised homogenous glass-bead packs. The use of analogue fluids and bead-packs enabled visualisation of the displacements as well as the usual measurements of effluent composition against time and recovery. Non-equilibrium was observed in the effluent from both the condensing and vaporising experiments. This increased with flow-rate but appeared to be independent of the permeability and the length of the bead-pack. Further experiments investigating the influence of gravity on vertical displacements indicated that non-equilibrium may also be a function of the viscous to gravity ratio. Detailed simulation using a commercial compositional simulator was unable to predict this non-equilibrium unless the results were tuned to the experimental observed effluent profiles using alpha factors. This is despite the fact that all PVT data, relative permeabilities and other pack properties were taken directly from experiments. However good match was obtained from a layered model with the permeability distribution obtained from a unit mobility ratio miscible displacement in the same pack. These results are consistent with physical dispersion being the underlying cause of the non-equilibrium. Viscous fingering is discounted due to the low mobility ratio (∼2) of the displacements.

UR - http://www.scopus.com/inward/record.url?scp=33745685780&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33745685780&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:33745685780

VL - 2

SP - 610

EP - 631

BT - Proceedings - SPE Symposium on Improved Oil Recovery

ER -