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• W2018341751 abstract "Abstract There is still a large amount of natural resources in heavy oil reservoirs which can be explored using new methods. However, this enormous amount of hydrocarbon resources which are in these reservoirs may be explored with new concepts. The VAPEX process is a promising recovery method. The process consists in two horizontal wells, parallel between themselves, producer and injector, where vaporized solvent is injected with the objective of reducing the oil or bitumen viscosity. The purpose of this work is to examine how some important operational and reservoir parameters influence the VAPEX process, in the produced oil rates, in the cumulative produced oil and in the recovery factor. Parameters such as the spacing between wells, the injection pressure, and type of solvent, oil viscosity, residual water saturation and horizontal permeability are addressed in this study. The choice of solvent to be used in the process was the factor that most significantly influenced the process, allowing a greatest recovery factor of oil. The largest cumulative oil recovered was obtained for other parameters of significant influence as the longest distance between wells, increased horizontal permeability and lower injection pressure. Introduction The exploitation of heavy oil or bitumen is of interest to many oil companies due to the decline of conventional oil reserves. These resources worldwide are in the order of 1 trillion m3 (about 6 trillion bbl) of oil in place, which is about six times more than the total reserves of conventional oil, where most is present in Venezuela. Canada is second with estimated oil in place of 400 billion m3 (2.7 trillion bbl), double the total deposits of conventional oil in the Middle East (Janisch, 1979). In many reservoirs, the high viscosity oil limits the primary production so the need to improve methods of recovery of oil. Currently, the thermal processes are implemented as a process of enhanced oil recovery for recovering heavy oil. But little by little, the miscible methods are also being indicated. The recovery by heat-based methods may be more problematic and uneconomical for some scenarios, such as reservoirs with gas cap, aquifer, high water saturation, low porosity, low thermal conductivity, small thickness, vertical fractures and / or cracks, and required other methods of recovery. In oil reservoirs where there is low efficiency of displacement and fluid injected cannot extract the oil from pores of the rock due to high interfacial tensions, the use of miscible methods may be recommended. Among these advanced methods of recovery can find the process VAPEX (vapor extraction) process that is under development as an alternative to thermal processes such as injection of steam. VAPEX process for recovery of heavy oil has attracted much interest in recent years due to the fact that steam is not used in the method. In Canada, for example, several oil companies are actively participating in developing the VAPEX process, which is advancing rapidly with the purpose of marketing them. Some of these companies are at Plover Lake, in Cold Lake, in Foster Creek, in Fort McMurray, all in Alberta, and in North Carruthers has implemented the process in pilot areas (Upreti, 2007). The impact of the spacing between the injector and the producer with and without gas cap was discussed by Karmaker et. al (2003). Das and Butler (1996) suggested that the propane and butane are the most effective solvents for VAPEX and proved that the diffusion of propane is more rapid than that of butane. The objective of this study is to analyze the process VAPEX through operational and reservoir parameters, and thus determine which parameters have significant influence in the process." @default.
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• W2018341751 date "2009-05-31" @default.
• W2018341751 modified "2023-09-26" @default.
• W2018341751 title "A Parametric Study of Solvent Injection as a Recovery Method For Heavy Oil and Bitumen Reservoirs" @default.
• W2018341751 doi "https://doi.org/10.2118/122040-ms" @default.
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