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IOR 1999 - 10th European Symposium on Improved Oil Recovery
- Conference date: 18 Aug 1999 - 20 Aug 1999
- Location: Brighton, UK
- ISBN: 978-90-73781-11-5
- Published: 18 August 1999
1 - 20 of 50 results
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Time Lapse Seismic as a Complementary Tool for Infill Drilling
Authors M. Landrø, L. K. Strønen, P. Digranes, O. A. Solheim and E. HildeTime lapse seismic data have improved the drainage understanding of the Gullfaks oil field, and have resulted in several potential new infill drilling targets. The baseline survey was acquired in 1985, one year before production start-up. Since then, two more surveys have been acquired, one in 1995, and another one in 1996. Key elements in the proces of reducing the uncertainties are cross-disciplinary verifications and detailed geophysical analysis and modelling, where different saturation profiles are input to the model. In order to include the interpretational uncertainties in the proces of quantifying the amount of remaining oil for each of the observations, the volume estimates are presented as probability curves.
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Well Planning in a Cave
Authors M. Midttun, R. Helland and A. N. HaalandNew virtual reality and visualization technology defines a new work environment both for individual experts and for larger groups or multidisciplinary asset teams. With this technology, data can be combined and presented in more intuitive ways and new methods for data interaction can be developed. The technology has the potential of improving quality and reducing turnaround for different work processes in the E&P industry. In 1997 Norsk Hydro installed a virtual reality CAVE laboratory and started the development of an integrated software system for seismic interpretation, reservoir modeling and well planning in virtual environments. Since late 1998 the system has been in active use on the Troll oil field for well planning and monitoring of wells during drilling. This paper summarizes the early experience from this activity.
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Multi Target Wells
More LessThe Vienna basin is a sedimentary basin of more than 10 km thickness and includes more than a dozen HC-layers. Since the area has been highly explored in the past 50 years only small reservoirs or compartments of already existing reservoirs can be expected to be found. However, existing infrastructure, such as pipelines, facilities and a nearby refinery would make even small finds attractive. In this light it was and is of eital importance to reduce risk and costs in HC exploration and production.
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Technical and Commercial Success on a Multi-Lateral Infill Drilling Project
Authors C. J. Brown, A. Scott and A. RichardsonDuring the second phase of Infill Drilling (Phase 2 IFD) at Wytch Farm, a 460HP workover rig converted four existing wells to > 1km departure horizontal multi-lateral wells. The project was a complete success technically, economically, and in terms of HS&E performance , productivity and oil recovery.
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Surfactant Concentration for Foam Formation and Propagation in Snorre Reservoir Core
Authors K. Mannhardt and I. SvorstølFoam floods were conducted in an oil-free Snorre field core with C14-16AOS surfactant and methane or Snorre field gas, at 90°C and 300 bar. The lowest surfactant concentration at which foam was generated overlapped the cmc region. Concentrations exceeding the cmc were required to propagate the foam, independently of surfactant adsorption. Once formed and propagated, the foam could be maintained for prolonged periods of gas/liquid co-injection at sub-cmc or zero surfactant concentrations.
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A Unified Model for Steady-State Foam Behavior at High and Low Foam Qualities
Authors J. M. Alverez, H. Rivas and W. R. RossenFoams are used on a pilot basis to divert gas flow in improved-oil-recovery projects. The complexity of foam behavior and apparent contradictions between foam studies has bedeviled attempts to onderstand foams and design effective field treatments.
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A Review of Cold Production in Heavy Oil Reservoirs
Authors B. Tremblay, G. Sedgwick and D. VuThe cold production process, in which sand and oil are produced simultaneously under primary conditions, has been economically successful in several unconsolidated heavy oil fields in Alberta and Saskatchewan, Canada. This review will first describe the field studies that have been performed by oil producers to understand the mechanisme involved in cold production including: tracer tests, gamma ray tests. The laboratory studies performed by different research organizations, including ARC, on the mechanisms involved in cold production: foamy oil drive, geo-mechanics, sand erosion, sand transport will be reviewed.
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Comparative Combustion Kinetics for In-Situ Combustion Process
Authors M. V. Kök and C. Ö. KeskinIn this research thermal characteristics and combustion kinetics of three crude oils (13-27 °API) veere investigated using DuPont 9900 thermal analysis system (TG/DTG) . A sample size of 10 mg., heating rate of 10 °C/min. were used in the temperature range of 20-700 °C under air atmosphere.
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Air Injection into Light Oil Reservoirs - Exothermicity and Kinetics of Crude Oil Oxidation
Authors M. Greaves, O. A. Osindero and R. RathboneGas Injection into light oil reservoirs is capable of achieving substantial incremental Improved Oil Recovery (IOR), providing that gas is available and considerable additional investment is not required. The availability of gas, especially in areas like the North Sea, is a critical factor affecting oil recovery economics. Air meets this criteria, on the basis that the oxygen can be effectively removed in the reservoir.
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Combined Physico-Chemical and Microbiological EOR Method
Authors L. I. Svarovskaya, L. K. Altunina and Z. A. RozhenkovaThe use of a combined physico-chemical and microbiological EOR method is promising for flooded oil fields of West Siberia, which are rich in hydrocarbon-oxidising microflora. The method is based on injection of oil displacing system containing a multicomponent nitrous substrate as a nutrition source for the formation microflora.
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Abnormal Viscosity Behaviour of Near Critical Fluids, Experimental Data and Modelling
Authors Z. Al-Siyabi, A. Danesh, B. Tohidi, D. H. Tehrani and A. C. ToddThe discovery of high pressure-high temperature (HPHT) reservoirs in various parts of the world and the increased possibility of encountering near critical fluids during primary depletion or IOR processes has emphasied the importance of having reliable techniques for predicting the physical properties of these fluids at these adverse conditions.
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Measurement and Interpretation of Three-Phase Capillary Pressure by Centrifuge
Authors G. A. Virnovsky and J. E. IversenThe paper describes the results of research aimed at measurements of capillary pressures and residual oil saturations in centrifuge under three-phase flow conditions. To analyze the data measured during a three-phase centrifuge test, an interpretation procedure based on theoretical analysis of capillary equilibrium in the field of centrifugal force is derived.
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Lagomar's Integrated Field Laboratory for Intensive Evaluation of Technologies
Authors G. De Carvajal, A. Velasquez, J. Graterol, F. Ramirez, M. Medina and R. GuimeransPDVSA's light oilfields in Lake Maracaibo have been onder exploitation for more than foor decades. To date, the expected recovery factor is only 29% of the OOIP. As these resources approach maturity, it has been realized that improving recovery will demand the earliest use of many technologies, proven and new, in an integrated manher and tailored to solve specific regional problems. The Integrated Field Laboratory (IFL) philosophy is one of PDVSA's main technology strategies designed to accomplish these goals. Three Field Laboratories are being developed in the Maracaibo Lake Basin: one for heavy oils and two for light oils: shallow and deep reservoirs.
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Cyclic Water Injection: Improved Oil Recovery at Zero Cost
Authors L. M. Surguchev, A. Koundin, O. B. Melberg, T. A. Rolfsvag and W. P. MenardCyclic injection is a process that improves waterflooding efficiency in heterogeneous reservoirs. The concept of cyclic injection is based on (1) pulsed injection and (2) altemating waterflood patterns. Cyclic injection has been successfully applied in a number of sandstone and carbonate oil fields in Russia. In the rest of the world, pulsed injection has had limited application, and only in naturally fractured reservoirs. Although changing the waterflood patterns is a common approach to deal with increasing water cuts a more systematic approach with both pulsed injection and alternating flow directions is not.
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Use of Core and Well Test Analysis to Improve Models for Stress-Sensitive Reservoirs
Authors T. A. Jelmert, H. Selseng and O. TorsæterThe permeability of stress-sensitive reservoirs are characterized by functions rather than single numbers. Permeability functions obtained by well testing may be thought of as some average on the length scale of the drainage area.
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Identification of the Permeability Heterogeneity of Laboratory Cores by Tracer Displacement
Authors L. Zhan and Y. C. YortsosWe propose a novel approach for the identification of the permeability heterogeneity, based on the analysis of the concentration contours in the miscible displacement of a passive tracer. By monitoring the displacement fronts at successive (and closely spaced) time intervals, the permeability heterogeneity can be obtained from the solution of a boundary-value problem. The method was tested successfully using synthetic data in 2-D geometry, involving a variety of heterogeneity including layered systems, and correlated permeability fields. An extension to anisotropic system is also described. The method finds application in the identification of the permeability heterogeneity of laboratory samples. The possibility of the extension to the field scale application is also discussed.
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Foam Assisted Water Alternating Gas (FAWAG) Process on Snorre
Authors H. A. Martinsen and F. VassendenThe FAWAG (Foam Assisted Water Alternating Gas) project is a full-scale demonstration by Saga Petroleum of the use of foam for gas mobility control. The foam injection started in the Central Fault Block (CFB) of the Snorre field in August 1998, after a two-year planning period, and many years of active research on foam. The first phase of the project, a Surfactant Alternating Gas (SAG) injection was completed in late November 1998. A co-injection phase was carried during January to June 1999. Approximately 1800 tons of commercial grade surfactant was used in this project.
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The Perspectives of Using Gas Technologies for Reef Oil Fields Development
Authors V. P. Davydov, Y. N. Yagafarov, Yu. A. Kotenyov and V. Ye. AndreyevIn the Republic of Bashkortostan gas EOR methods have been commercially introduced in fields related to the Lower Permian age reft masses of Preural foredeep.
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Effect of Lean and Inert Gases on Interfacial Properties in Ultra Light Oil Reservoirs
Authors I. Lakatos, K. Bauer, J. Lakatos-Szábo, S. Puskás, G. Y. Palásthy, S. Trömböczky and B. KosztinApplication of lean gases, particularly a methane rich gas, nitrogen, carbon dioxide, air and their mixtures in an ultra light oil bearing reservoir located in Southern Hungary, is in an advanced stage. The relevant studies and mathematical simulations have definitely indicated a substantial surplus oil production and it was also revealed that gravity segregation and vaporization of light hydrocarbons were the main elements of the displacement mechanism.
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