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A SIMULATION STUDY OF MISCIBLE AND IMMISCIBLE CO2 WAG INJECTION

HAN YONG, JOACHIM WAN (2013) A SIMULATION STUDY OF MISCIBLE AND IMMISCIBLE CO2 WAG INJECTION. Universiti Teknologi Petronas. (Unpublished)

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Abstract

As reservoir pressure continues to deplete leaving substantial unrecovered oil in the reservoir after secondary recovery, various enhanced oil recovery methods need to be evaluated to produce additional drive to increase the recovery factor of reservoir oil, among which is the water alternating gas (WAG) injection method. Choice has to be made whether to perform miscible or immiscible displacement, depending on reservoir conditions, incremental recovery, and cost-benefit analysis. In this project, several factors affecting miscible and immiscible displacement performance are reviewed, such as volumetric sweep efficiency and unit displacement efficiency. CO2 gas is chosen to be the subject of research because of its favorable properties and behavior for miscible flooding, and its abundance in Malaysia (Samsudin, et al., 2005). This project focuses on studying the potential ways to achieve CO2 miscibility with reservoir oil via increasing reservoir pressure via water flooding, or decreasing reservoir temperature via coolant flooding, by using a compositional model simulator with thermal option. Simulation results show that lowering reservoir temperature allows CO2 to extract more heavy components from the oil phase, which increases oil recovery factor. This can be done by injecting cold water and/or cold CO2 itself. However, if CO2 temperature drops below its critical temperature, it condenses into liquid phase with extremely high viscosity, therefore it may take a longer time to cool down regions further away from the injector.

Item Type: Final Year Project
Academic Subject : Academic Department - Petroleum Geosciences - Petrophysics - Petrophysical data acquisition
Subject: T Technology > T Technology (General)
Divisions: Geoscience and Petroleum Engineering
Depositing User: Users 2053 not found.
Date Deposited: 21 Nov 2013 11:20
Last Modified: 25 Jan 2017 09:38
URI: http://utpedia.utp.edu.my/id/eprint/10716

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