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Simulation Study On WAG-CO2 Injection Optimization For Less Asphaltene Precipitation In Light Oil

NARAYANAN, PUVENESHWARI (2013) Simulation Study On WAG-CO2 Injection Optimization For Less Asphaltene Precipitation In Light Oil. Universiti Teknologi Petronas. (Unpublished)

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Abstract

Flow assurance issues due to asphaltene precipitation in light oil reservoirs during water-alternating-carbon dioxide gas (WAG-CO2) injection are common. The possibility of asphaltene precipitation is often neglected during enhanced oil recovery (EOR) planning phase due to its minute amount in light oils. Another problem is the lack of prior knowledge on the WAG parameters that could possibly enhance the asphaltene precipitation during WAG-CO2 injection. Based on the severity of the problem, this study was initiated with the aim to determine and suggest the optimum WAG parameters, namely WAG injection rate, WAG injection pressure, WAG cycle sizes, WAG ratio and injected water salinity for lesser asphaltene precipitation. A compositional model was built using compositional simulator for the purpose of this study. The impacts of each WAG parameter were determined by varying the parameters one at a time while keeping others constant in the simulation runs. The results revealed the parameter with profound effects is only the injection pressure. The higher the injection pressure, the lesser the amount of asphaltene precipitated and deposited. WAG ratio of 2:1 gives better oil recovery and lesser asphaltene precipitation due to waterblocking effect. Other parameters have a slight effect or no effect at all on the asphaltene precipitation. Based on this study, it can be deduced that manipulating the injection pressure and WAG ratio will control the amount of asphaltene precipitated and deposited. The outcomes of this study will benefit the operators adopting WAG-CO2 method in light oil fields through better management of flow assurance problems caused by asphaltene precipitation.

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: 22 Nov 2013 16:50
Last Modified: 25 Jan 2017 09:38
URI: http://utpedia.utp.edu.my/id/eprint/10728

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