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IOR 1995 - 8th European Symposium on Improved Oil Recovery
- Conference date: 15 May 1995 - 17 May 1995
- Location: Vienna, Austria
- ISBN: 978-94-6282-125-5
- Published: 15 May 1995
21 - 40 of 87 results
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Evaluation of IOR Techniques at the Ula Field
Authors St. R. Jakobsen, T. M. Hegre, J. Peak and T. JohansenThe Ula reservoir consists of ons main reservoir unit which presently is very well swept by injected water, and ons upper reservoir unit from which there is significantly lower oil recovery due to its lower permeability.
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Scaling of Three Phase Compositional Simulation - A Numerical Investigation
Authors D. Wessel-Berg and O. St. HustadA general method for scaling three dimensional three-phase compositional flow based on a fine scale simulation is presented.
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Pore Level Modelling of Three Phase Flow in Porous Media
Authors D. H. Fenwick and M. J. BluntWe analyze the pore level displacement of three phases - water, oil and gas. The presence of a third phase dramatically alters the flow, because of the formation of a layer of oil between water and gas in the pore space.
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EOR Application in Large Oil/Gas Fields of West Siberia: Generalisation of the Experience, New Technologies
More than 30% of oil and gas-condens ate reserves in Russia are contained in the oil fields having gas caps. Annual recovery race of such reserves is less than 6%. Race of oil production and oil recovery factor are also very low. The discovery of giant oil fields in the West Siberia, such as the Samotlor oil field, the Lyantor oil field and the Fyodorovskoe oil field as well as many other fields, has demanded application of new technologies for the development of wast under-gas zones.
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Matching the Future for the Evaluation of Extreme Reservoir Development Scenarios
Authors D. Guerillot and F. RoggeroThe reservoir engineer needs not only to match the past but also has to forecast production by considering various geological models and reservoir development scenarios.
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Scale-Up of Near Miscible Gas Injection Processes: Integration of Laboratory Measurements and Compositional Simulation
Authors K. K. Pande, J. M. Sheffield, A. S. Emanuel, R. L. Ulrich and E. F. De ZabalaResults from laboratory PVT measurements, special core analysis studies, and reservoir condition coreflood studies were used to develop and test the accuracy of a compositional simulation model in predicting near- mullticontact miscible gas flood performance at the laboratory scale.
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The Role of Capillary Pressure in Compositional Simulation of Heterogeneous Reservoirs
Authors J. W. Barker and G. SindicCompositional simulations (neglecting gravity) of a simple reservoir element consisting of regions of high and low permeability reveal imbibition of oil into the low permeability region during depletion, and extraction of the oil from this region during lean gas injection by `capillary pumping', a mechanism driven by variations in interfacial tension. Initial fluid composition is found to have a significant effect. The range of dimensionless capillary numbers for which capillary pressure may be neglected is determined, but evaluation of these numbers is not easy.
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Enhanced Oil Recovery of the Anisotropic Reservoir
Authors S. Zakirov and V. PiscarevUsually, productive formations of oil and gas fields are anisotropic on their reservoir properties. Most scientists paid attention to determination and taking into consideration the anisotropy of permeability in vertical direction.
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A Generalized Streamline Method to Predict Reservoir Flow
Authors M. J. Blunt, K. Liu and M. R. ThieleWe present a generalized streamline method that is able to model flow in porous media-including gravity, compositional effects and dispersion in three dimensions. First we describe the theory and discuss the approximations of the method. Then we compare the predictions using the streamline technique against high resolution numerical simulation.
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WAG Injection at Reservoir Conditions in a Layered Long-Core Loaded with a Live North Sea Crude
Authors I. Akervoll, P. A. Slotte and A. G. HansenWater-alternating-gas (WAG) and Combined water/gas (CWG) injection schemes have gained increasing interest in the recent years as a strategy to improve and accelerate oil recovery from North Sea Fields.
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A Consistent Correlation for Three Phase Relative Permeabilities and Phase Pressures Based on Three Sets of Two Phase Data
Authors O. St. Hustad and A. G. HansenA correlation for three-phase relative permeabilities and phase pressures for reservoir simulators is presented.
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Gas Mobility during Three Phase Flow in a WAG Process
Authors P. K. Munkerud and O. HoimyrThe main objectives of the work presented in this paper was to determine the influence of saturation history, fluid/rock interaction (wettability), fluid interfacial tensions and capillary pressure on gas mobility during three phase flow in combined gas/water injection processen (CGW, WAG or tertiary gas injection).
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Evaluation of Associated Gas Injection in the Miller Field
By T. P. MouldsThe Miller Field, located in the UKCS, contains a light oil with 18% C02 and a high GOR of 1830 scf/stb. The associated gas is currently exportel with 22% C02 content.
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Simulation of WAG and Gas Injection with Potential Sweep Improvement by Application of Foam
Authors L. M. Surguchev, J. E. Hanssen, D. A. Coombe and I. SvorstoelStratified oil reservoirs with high permeability contrast and moderate structural dip are considered today as potential candidates for WAG and/or for dowdip gas injection. The combination of waterflooding and gas injection processes in WAG as well as updip gas injection are well known processes, quite intensively studied for North Sea application. This simulation study aims to compare different gas-assisted processes and has a focus on the importance of anisotropy and vertical inter-layer communication in stratified reservoirs for these methods.
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Oil Recovery by Gravity Drainage during Gas Injection
Authors H. Skurdal, O. St. Hustad and T. HoltThis paper presents the results from six gravity stable gas injection experiments in 1.2 m long water flooded sandstone cores. All experiments were performed close to ambient conditions with different combinations of spreading and wetting characteristics for time periods of 50 to 170 days. The effectiveness of oil recovery by gravity drainage for the different flow conditions are shown. A mixed wet membrane was placed on the outlet of each core to eliminate end effects. Experimental techniques for eliminadon of capillary end effects are discussed. Saturation profiles in the cores were determined at the end of each experiment.
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Impact of Large Scale Permeability Heterogeneity in the Optimisation of a WAG Process in Tertiary Conditions
Authors J. P. Duquerroix and F. KalaydjianAmong the Improved Oil Recovery (IOR) processes, Water Alternating Gas (WAG) injection process seems to have a wide potential in the North Sea. The Tule of thumb is still in use and both industry and research need to design procedures to ensure broader application of WAG technology.
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Simulations of CGW Injection in Parts of a Fluvial Deposited Reservoir
Authors P. A. Slotte, A. Solheim and J. I. JensenPoor sweep efficiency and early break through is a main concern with respect to improved oil recovery by gas injection processes. These adverse effects may be eliminated by combined gas and water (CGW) injection. The efficiency of a CGW injection proces is strongly related to the size of the mixed gas/water flow zone in the reservoir.
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The Design of a (Near) Miscible Gas Displacement Process for a Transition Zone Reservoir
Authors A. A. Espie, Ch. E. Brown and R. C. SkinnerNorth Sea reservoirs tend to be characterised by a relatively low relief with a substantial part of the reservoir consisting of a water / oil transition zone.
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Gravity Drainage during Gas Injection
Authors P. Naylor, N. C. Sargent, A. J. Crosbie, A. P. Tilsed and S. G. GoodyearThe drainage of oil under gravitational forces has been an important mechanism in the production of many oil fields. In order to extend the economic implementation of gas injection into more marginal fields, a reduction in the uncertainties associated with gravity drainage is required. This paper describes a series of three tertiary, nitrogen experiments which investigated the effect of permeability on gravity drainage. The experiments were conducted at low pressure using long, vertical, water-wet sandstone sores and decane in the presence of connate brine.
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CO2 IOR in the Szank Field Using CO2 from Sweetening Plant
Authors I. Remenyi, A. Szittar and G. UdvardiField scale CO2 EOR operations started in 1972 in Hungary. Partially miscible EOR recovery was completed in the sandstone reservoirs of Budafa and Lovászi fields and recovery by artificial CO2 gas cap has been accomplished in the carstic/cavemous limestone reservoir of the Nagylengyel field.
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