Feasibility study of miscible gas injection in a carbonate oil reservoir; A systematic experimental and simulation approach

Mehdi Alipour Kallehbasti, Javad Rostami Paroodbari, Nasser Alizadeh, Reza Rostami Ravari, Mahmood Amani

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

1 Citation (Scopus)

Abstract

Gas injection is a common practice in many carbonate oil fields; however, there is a lot of debate around the viability of economical enhanced oil recovery by miscible gas injection. For a correct simulation of miscible gas injection and monitoring the progress of the miscible front in the reservoir, a compositional reservoir simulation is needed. Fluid characterization is one of the most important parts of this simulation. In this paper, fluid characterization for such a mechanism is discussed and a systematic approach is presented which could be used in any other similar study. The dynamic reservoir simulation is also brought at the end for comparison. The carbonate reservoir of the field of interest, contains 900 million barrels of under-saturated, 34 API degrees oil, with initial reservoir pressure of 8200 psi. After building a PVT model and adjusting the Equation of State (EOS), the Minimum Miscibility Pressure (MMP) of four different injection gases (N2, CO2, associated gas and sales gas) were calculated with different methods. Swelling test and slim tube test were also conducted which were used to cross check the EOS tuning. Although, MMPs in all cases were much lower than initial reservoir pressure, their effects on recovery factor were different. A compositional reservoir model was built based on the tuned EOS and the effects of all injection gases in different scenarios were examined. The procedures as well as the main results are explained in this paper.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2012, ADIPEC 2012 - Sustainable Energy Growth: People, Responsibility, and Innovation
Pages2697-2705
Number of pages9
Volume4
Publication statusPublished - 2012
Externally publishedYes
EventAbu Dhabi International Petroleum Exhibition and Conference 2012 - Sustainable Energy Growth: People, Responsibility, and Innovation, ADIPEC 2012 - Abu Dhabi, United Arab Emirates
Duration: 11 Nov 201214 Nov 2012

Other

OtherAbu Dhabi International Petroleum Exhibition and Conference 2012 - Sustainable Energy Growth: People, Responsibility, and Innovation, ADIPEC 2012
CountryUnited Arab Emirates
CityAbu Dhabi
Period11/11/1214/11/12

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ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Kallehbasti, M. A., Paroodbari, J. R., Alizadeh, N., Ravari, R. R., & Amani, M. (2012). Feasibility study of miscible gas injection in a carbonate oil reservoir; A systematic experimental and simulation approach. In Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2012, ADIPEC 2012 - Sustainable Energy Growth: People, Responsibility, and Innovation (Vol. 4, pp. 2697-2705)