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wag-injection
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Experimental and Simulation Study of Water Alternating Hydrocarbon - CO2 Mixture Gas in one of Iranian Oil Reservoirs
, M.Sc. Thesis Sharif University of Technology ; Taghikhani, Vahid (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Badakhshan, Amir (Supervisor)
Abstract
In this work the effect of composition changes of the injection gas (Hydrocarbon gas + carbon dioxide) on Water Alternating Gas (WAG) performance in immiscible flooding which has been rarely attended in the available literature is investigated. Core flood experiments are conducted on a 10 cm length Sarvak sandstone core sample at 46 degree C and at immiscible condition, i.e., below the minimum miscible pressure (MMP) of the oil sample using pure CO2 as injected Gas.The influence of injection WAG ratio on oil recovery also is investigated. Artificial injection brine which is made by dissolving NaCl into distilled water with 5000 ppm (mg/L), NaftShahr oil which has about 41 API gravity and...
Evaluation of Different Water and Gas Injection Scenarios for Improving Recovery of One of the Iranian South West Reservoirs
, M.Sc. Thesis Sharif University of Technology ; Masihi, Mohsen (Supervisor)
Abstract
Increasing the global demand for energy and decreasing the production rate of oil reservoirs have forced the oil companies to focus on enhanced oil recovery (EOR) extensively. This paper summarizes the design, reservoir simulation, and results of different gas injection scenarios in one of the Iranian complex oil reservoirs. This complex reservoir is located in the south west of Iran and is made up of sandstone, limestone, and dolomite layers. It is an under saturated reservoir with no gas cap but with a strong aquifer. Oil production has started in 1977, but due to strong aquifer the production is still in the plateau period. In this study, by simulation, it is estimated that natural...
Experimental and Modeling Study of Gas/WAG Injection at Near Miscible Condition in One of Iranian Oil Reservoirs
,
M.Sc. Thesis
Sharif University of Technology
;
Ghazanfari, Mohammad Hossein
(Supervisor)
;
Massihi, Mohsen
(Supervisor)
Abstract
Most of the Iranian oil reservoirs are reaching end of their natural production life, hence they are suitable candidates for EOR common processes like gas injection and WAG injection. Studies have shown that gas and WAG injection can be applied for optimal oil production. Past studies have been mainly on gas and WAG injection in immiscible or fully miscible conditions and there is a limited amount of data available on performance of these methods in near miscible conditions. Miscible injection is not feasible in old Iranian oil reservoirs due to their depleted pressure. Moreover injection in lower pressures is attractive from both economical and operational standpoints since this reduces the...
Simulation and Investigation of EOR Method in Cheshmeh Khosh Oil Reservoir
, M.Sc. Thesis Sharif University of Technology ; Godarznia, Iraj (Supervisor) ; Helalizadeh, Abbas (Supervisor) ; Masihi, Mohsen (Supervisor)
Abstract
Considering that hydrocarbon production, reduces energy of reservoir and causes part of the valuable compounds remaining in the oil or gas reservoir and can not be extracted by reservoir energy, so optimization of production by control flow rate, drilling new wells and applying lOR and EOR methods in order to increase hydrocarbon recovery is necessary. Gas and water inject through injection well into the reservoir for improve oil recovery. As implementation of different production and injection scenario is very expensive. Simulation of different method and applying the best is very helpful and necessary. In this study we use Eclipse software that is one of the best software that can simulate...
Experimental investigation of water alternating CH4-CO 2 mixture gas injection in light oil reservoirs
, Article International Journal of Oil, Gas and Coal Technology ; Vol. 8, issue. 1 , 2014 , p. 31-40 ; Ghazanfari, M. H ; Taghikhani, V ; Badakhshan, A ; Sharif University of Technology
Abstract
This paper studies a WAG process for improving the recovery efficiency in light oil reservoirs. Until now, few references have reported the role of CO2 mole percent on recovery improvement in light oil reservoirs. The injected gas was changed, and the effect of composition changes on performance of core flood experiments were conducted at fixed flow rate. Five series of experiments (varied in methane mole percentages, 0, 25, 50, and 75, 100) were systematically examined. The results indicated that the oil recovery efficiency improved with the increasing of CO2 mole ratio and there was also maximum recovery efficiency in this work. That would be helpful to better understanding the role of CO2...
Experimental Investigation and Comparison of Water Alternative Gas (WAG) and Continuous Gas Injection (CGI) Processes in One of Iranian Oil Reservoirs
, M.Sc. Thesis Sharif University of Technology ; Ghotbi, Sirous (Supervisor) ; Kharrat, Reyaz (Supervisor)
Abstract
Gas injection processes are considered as the second largest Enhanced Oil Recovery processes after thermal processes. In Dealing with the problems of Continuous Gas Injection (CGI) processes, the substitute method of Water Alternating Gas (WAG) is gaining ever increasing attention in field applications. The Hybrid method has the advantages both CGI and WAG processes. Laboratory studies of gas injection methods to show the optimum method and the effect of pressure on the performance of this method is the main objective of this project. Results obtained from these tests can be used in the Enhanced Oil Recovery scenarios for this reservoir. In this project, experiments for Continuous Gas...
Experimental investigation of heavy oil recovery by continuous/WAG injection of CO2 saturated with silica nanoparticles
, Article International Journal of Oil, Gas and Coal Technology ; Volume 9, Issue 2 , 2015 , Pages 169-179 ; 17533317 (ISSN) ; Khezrnejad, A ; Shahrokhi, O ; Ghazanfari, M. H ; Vossoughi, M ; Sharif University of Technology
Inderscience Enterprises Ltd
2015
Abstract
In this work, application of CO2 saturated with silica nanoparticles in continuous/water alternating gas (WAG) injection for heavy oil recovery was investigated which has been rarely attended in the available literature. Core displacement tests were conducted to monitor heavy oil recovery in both continuous and WAG injection schemes. It has been observed that for continuous nano-saturated CO2 injection, the oil recovery is higher than pure CO2 injection. This observation might be explained by alteration of rock wettability to a more water-wet condition. In WAG injection scheme, water breakthrough happened later in nano-saturated CO2 than pure CO2 injection. This delayed water breakthrough...
Optimization of the WAG injection process
, Article Petroleum Science and Technology ; Volume 33, Issue 3 , Jan , 2015 , Pages 294-301 ; 10916466 (ISSN) ; Alizadeh, A ; Ghazanfari, M ; Alizadeh, N ; Sharif University of Technology
Taylor and Francis Inc
2015
Abstract
Availability of hydrocarbon gases at the field makes it attractive for gas-based enhanced oil recovery (EOR) methods such as water alternating gas (WAG) injection. Optimization of EOR methods requires too many simulation runs, which are time consuming and expensive. Therefore, developing a proxy model, which emulates simulator outputs, is considered as an appropriate alternative technique. In this work, effects of composition changes of injection gas, WAG ratio, and slug size on produced oil and water were investigated. In addition, the optimum value of the previous parameters, including some constraints, are presented using response surface methodology. Experimental design is also applied...