The effects of CO2 concentration in flue gas injection for heavy oil recovery from fractured reservoirs durino GOGD process

A. Mohsenzadeh, M. Escrochi, M. V. Afraz, Sh Ayatollahi, Gh Karimi, Y. Ai-wahaibi

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

1 Citation (Scopus)

Abstract

Considerable heavy oil is accumulated in naturally fractured carbonate reservoirs, with very low oil recovery efficiency through costly production techniques. In this experimental study, the effects of different injecting gases on the performance of immiscible gas injection and the GOGD process have been investigated at reservoir conditions from full sized carbonate cores in a long fractured laboratory model. During this study on heavy crude oil, three different gases: pure CO 2, pure N2 and their mixture as synthetic flue gas injection; were used to study theperformance of isothermal GOGD process. It was found that the oil recovery before gas breakthrough was mostly from the fracture; however the injected gas mostly affected the amount of oil recovery and its rate from the matrix part. The piston wise displacement during N2injection and oil swelling during CO2injection were found to be the most important mechanisms affecting the oil recovery performance before gas breakthrough. On the other hand, It was found that the oil recovery efficiency for CO2 injection after gas breakthrough was mainly due to gas dissolution mechanism and for N2 injection it was because of high oil-gas density difference;both resulted in approximately 14% recovery efficiency of the remained OIP. However, flue gas injection activated both mechanisms simultaneously with their adverse effects and the recovery efficiency decreased to approximately 10% of the remained OIP. It was also concluded that the GOGD mechanism needs to be stimulated by other compatible techniques such as thermal methods, to increase heavy oil recovery from the matrixes of the fractured formations. CoDvriaht 2014. Society of Petroleum Engineers.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - SPE EOR Conference at Oil and Gas West Asia 2014
Subtitle of host publicationDriving Integrated and Innovative EOR
PublisherSociety of Petroleum Engineers
Pages489-503
Number of pages15
ISBN (Print)9781632663184
Publication statusPublished - Jan 1 2014
Externally publishedYes
EventSPE EOR Conference at Oil and Gas West Asia 2014: Driving Integrated and Innovative EOR - Muscat, Oman
Duration: Mar 31 2014Apr 2 2014

Publication series

NameSociety of Petroleum Engineers - SPE EOR Conference at Oil and Gas West Asia 2014: Driving Integrated and Innovative EOR

Other

OtherSPE EOR Conference at Oil and Gas West Asia 2014: Driving Integrated and Innovative EOR
CountryOman
CityMuscat
Period3/31/144/2/14

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Fingerprint Dive into the research topics of 'The effects of CO<sub>2</sub> concentration in flue gas injection for heavy oil recovery from fractured reservoirs durino GOGD process'. Together they form a unique fingerprint.

Cite this