A study of three phase relative permeability and hysteresis in water alternating gas (WAG) injection

Olamide A Arogundade, Hamid Reza Shahverdi, Mehran Sohrabi Sedeh

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

3 Citations (Scopus)

Abstract

Various techniques of Enhanced Oil Recovery (EOR) exist and amongst them water and gas injection are the most widely used. It has been shown that combining water and gas injection in a WAG (water alternating gas) scheme can result in additional oil recovery. Interest in WAG injection has increasingly grown in recent times with many reservoirs around the world now under WAG injection.

Numerical simulation of WAG requires reliable three-phase relative permeability and hysteresis data which are normally obtained from models available in commercial simulators. This paper utilizes core-flood experimental data from literature to investigate validity of these models.

The findings from this study provide evidence that different three-phase relative permeability models were found to behave differently giving varying recovery factors in a WAG simulation scheme. While the effect of irreversible hysteresis was studied, it was observed here that imbibition (stage I) and drainage (stage II) processes gave results that deviated from conventional hysteresis. Simulations were run with and without hysteresis for different three phase relative permeability models with different effects observed for the recovery factor.

The results of this work show that a good understanding of the three phase relative permeability model in use is very important for a more robust reservoir simulation model. Also, the effect of irreversible hysteresis in WAG injection should be adequately modelled in order to obtain reliable results. Lastly, the results reveal the importance of optimum WAG ratio for maximizing oil recovery by preventing a gas tongue forming at the top of the reservoir and a water tongue forming at the bottom of the reservoir.
Original languageEnglish
Title of host publicationSPE Enhanced Oil Recovery Conference (EORC 2013)
Subtitle of host publicationDelivering the Promise NOW!
Place of PublicationRichardson, Texas
PublisherSociety of Petroleum Engineers
Pages102-117
Number of pages16
ISBN (Electronic)9781613992586
ISBN (Print)9781627488129
DOIs
Publication statusPublished - Jul 2013
EventSPE Enhanced Oil Recovery Conference - Kuala Lumpur, Malaysia
Duration: 2 Jul 20134 Jul 2013

Conference

ConferenceSPE Enhanced Oil Recovery Conference
CountryMalaysia
CityKuala Lumpur
Period2/07/134/07/13

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