Comparison Between Micro-Emulsion and Surfactant Solution Flooding Efficiency for Enhanced Oil Recovery in TinFouye Oil Field
- M. Bouabboune (Applied And Theoritical Fluid Mechanical Laboratory, Faculty Of Physics) | N. Hammouch (Sonatrach, Division Forage) | S. Benhadid (Applied And Theoretical Fluid Mechanical Laboratory, Faculty Of Physics)
- Document ID
- Petroleum Society of Canada
- Canadian International Petroleum Conference, 13-15 June, Calgary, Alberta
- Publication Date
- Document Type
- Conference Paper
- 2006. Petroleum Society of Canada
- 5.3.2 Multiphase Flow, 5.2.1 Phase Behavior and PVT Measurements, 5.4.1 Waterflooding, 2.5.2 Fracturing Materials (Fluids, Proppant), 4.1.5 Processing Equipment, 5.7.2 Recovery Factors, 1.6 Drilling Operations, 1.6.10 Coring, Fishing, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 3.1.6 Gas Lift, 5.1.4 Petrology, 4.1.2 Separation and Treating, 5.2 Reservoir Fluid Dynamics, 5.4.10 Microbial Methods, 5.6.1 Open hole/cased hole log analysis, 5.3.4 Reduction of Residual Oil Saturation
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The TinFouy? reservoir is among the largest oil reservoir discovered in Algeria. The reservoir has been extensively gas lifted since many years. Operating gas lift is now reaching their economic limits. So it will be necessary to call to tertiary enhancement method. This report investigates the technical feasibility of applying a microemulsion flood to TFY reservoir.
This study has two major components: First, is to optimize the concentration of surfactant, in order to obtain a lower interfacial tension between oil and microemulsion phases, and a high viscosity of the microemulsion compared to that of the oil phase. Second is to test the effectiveness of the obtained optimum chemical system for the displacement of residual oil saturation after waterflooding (secondary recovery). TinFouy? reservoir conditions and simples are used in this study. The G?omecanique equipment has been used for the displacement experiments in porous media.
Through phase behavior studies, two optimum microemulsion compositions were determined: 4wt% anionic surfactant, 2.5wt% pentanol, total salinity of 0.5g/l. two surfactant solutions have been prepared, with the same anionic and alcohol concentration as those of the optimized microemulsions, which allows us to compare their efficiency to displace the residual oil saturation. As a result, higher rate ae obtained by injecting a microemulsion followed by polymer flooding.
The TinFouy? oil reservoir is located in South-East; 1400km far from Algiers, with a depth vary between 1100m and 1500m. The reservoir was discovered in December 1960throught the first drilling of TinFouy? 1.The production started in 1963, from initially 30 wells in production, 16 were shut-in between August 1967 and February 1985.
The petrophysical analysis made by Sonatrach show that the reservoir is characterized by an excellent permeability and an average porosity. Also, the evaluation of the synthetic petro-logs derived from the core data, the reservoir appears to be homogenous. The original oil-in place (OOIP) was calculated by Sonatrach in 1968 using the volumetric method for the entire TinFouy? field, Sonatrach uses an OOIP of 78 million m3. Cumulative production until December 1988 sums up to 30.85 million m3 that corresponds approximately to 39% OOIP production rate, with water-cut of 70%. Also, these studies show that the cumulative secondary oil recovery using water flooding could attend 13 million m3 in 2006, with a water-cut of 90%. Consequently, the total volumetric oil remaining in TinFouy? reservoir is about 34.15 million m3 which corresponds to 43.78% OOIP that is why, Sonatrach has decided to look at chemical flooding option to lower the water flood residual oil and improve the sweep efficiency at the same time.
Among chemical flooding methods, microemulsion /polymer flooding and surfactant/polymer flooding processes are particularly effective for recovering a large fraction of the conventional oil (25 ° API or higher) left in the reservoir after a water flood1.2.3. The present laboratory study compares and contrasts the two processes, based on tertiary floods in TFY sandstone core. Lowering the interfacial tension between reservoir brine and oil to the point of microemulsification has been proved to be tremendously effective in reducing residual oil saturations.
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