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Document Type:Latin Dissertation
Language of Document:English
Record Number:55263
Doc. No:TL25217
Call number:‭MR20240‬
Main Entry:Mohammad Tuhinuzzaman
Title & Author:The role of capillarity in the VAPEX processMohammad Tuhinuzzaman
College:The University of Regina (Canada)
Date:2006
Degree:M.A.Sc.
student score:2006
Page No:127
Abstract:The process using hydrocarbon vapours to extract bitumen or heavy oil, known as VAPEX (Vapour Extraction), has been studied in the last decade. The original concept of this non-thermal process is similar to that of the steam-assisted gravity drainage (SAGD) process. In the VAPEX process, gas and/or solvent is injected at or near the dew point so that the solvents can remain vapourized in the chamber around the horizontal injector. Dilution of heavy oil and thus lowering the viscosity, density, IFT and capillary pressure is regarded as the basic mechanism of the VAPEX process. Although, in VAPEX, researchers have studied many influencing factors on oil recovery, the effect of capillary pressure has never been studied or understood completely. This research addresses the issue related to this important parameter on a preliminary basis. The research commences with diluting the original heavy oil with kerosene at different weight percentages to generate 4 different oil samples. Experiments are conducted to construct capillary pressure curves for the lighter oil samples. Heavier oil samples were utilized to construct corresponding relative permeability curves by un-steady state displacement technique. Thereafter, the main phase of the experimental studies commences with lab scale applications of the VAPEX process using the heavier oil samples. While the dynamic process continues, efforts are put forward to calculate oil drainage rate, gas rate, gas-to-oil ratio (GOR) and cumulative recovery with respect to time. The final stage of this research work is composed entirely of simulation studies. At the initial stage, two different oil compositions are generated in WINPROP to represent the heavier oil samples prepared earlier in the lab. Care has been taken to match the simulated and original oil sample physical properties by utilizing the Regression feature in WINPROP. Henceforth, all the available data are plugged into the CMG GEM simulator to predict the performance of VAPEX in lab scale. For each oil sample, results were generated with or without tuning in the capillary pressure curves. By comparing the experimental and simulation results, it can be deduced that capillary pressure's major contribution on the VAPEX process is its influence in shaping up the vapour chamber. In the absence of capillary pressure data in simulation, the vapour chamber tends to grow vertically with a minimal sideways leaching. Fitting capillary data results in a mushroom-shaped vapour chamber, which is more prevalent for the heavier oil sample. Secondly, capillarity prolongs the solvent breakthrough, occurrence of which initiates the VAPEX process. However, after solvent breakthrough, capillary pressure causes drainage rate to increase by extending the effective diffusion area. Simulation studies show that fitting in capillary pressures anticipates higher rates and productions.
Subject:Applied sciences; Petroleum production; 0765:Petroleum production
Added Entry:The University of Regina (Canada)