IOR 2005 - 13th European Symposium on Improved Oil Recovery

C02 RESTARTING A HISTORY-MATCHING STUDY FOR AN EXISTING RESERVOIR MODEL Abstract 1 Sometimes reservoir engineers want to update a previously built reservoir model to integrate newly collected data. Unfortunately the data used to generate the existing reservoir model are often lost. To avoid restarting the history-matching study from the very beginning we developed several techniques to infer the missing data. These data consist of a random function characterized by geostatistical parameters and a set of random numbers. The existing reservoir model is the realization associated to the estimated random numbers given the estimated random function. Once the random function and

C04 PORE-TO-FIELD MULTI-PHASE UPSCALING FOR A DEPRESSURIZATION PROCESS Abstract 1 This paper describes the application of a multi-step multi-phase upscaling technique to the Statfjord Field a mature oil field located in the North Sea. The method is aimed at consistently accounting for the effects of small-scale heterogeneities on field simulations. In this work special attention is given to the small-scale (pore- to lithofacies-scale) modeling and upscaling for a pressure depletion process in a water flooded reservoir. Five different lithofacies models for the Rannoch and Tarbert Formations were created. Both formations are central in the studied field and consequently have been

C06 Flexible upscaling using perturbed boundary conditions L.RICARD M. LE RAVALEC-DUPIN Y. GUÉGUEN Abstract 1 This paper presents a new technique for upscaling absolute permeabilities on coarse CPG grids. Within this framework traditional upscaling methods depend on arbitrary local boundary conditions. They are fairly accurate for lognormal fields but they fail for channelized fields and highly heterogeneous systems. The method introduced in this paper takes advantage of global fluid flow simulations to select pertinent local boundary conditions. These ones are then used for upscaling permeabilities. To reduce interpolation errors and to be independent from fluid flow numerical simulation schemes we

C08 ESTIMATION OF WATER SATURATION FROM TRACER DATA Abstract In the coming years production from the Norwegian Shelf will decline and the main focus will be concentrated on smaller fields and mature fields. Thus the importance of minimizing the uncertainty of infill drilling and other IOR methods will increase with the decreasing economic margins. 1 The key to successful reservoir management is a thorough understanding of all the available data how they are obtained and carefully integrated into a consistent and reliable model. The major factor for deciding to adopt IOR strategies as the drilling target is the spatial distribution

C12 IMPROVED THERMAL-STEAM TREATMENT OF HIGH-VISCOSITY OIL POOLS BY СО2 GENERATING SYSTEMS Abstract 1 A novel technology has been developed to enhance oil recovery from reservoirs containing highviscosity oils. The technology combines thermal-steam and physico-chemical treatments using surfactant-based systems which are capable to generate СО2 and alkaline ammonium buffer solution in situ. Pilot tests of EOR technology were successfully carried out both in Russia and China. In Russia 264 m 3 of 50 % solution of oil-displacing system were injected into three steaminjection wells in the area of Permocarbonic high-viscosity oil pool Usinskoye oil field. In 1-3 months the production

C14 THERMAL MODELING ANALYSIS FOR COMPLETION DESIGN OF DEEP OFFSHORE HEAVY OIL RESERVOIRS Abstract 1 This paper examines the theoretical application of wellbore heat losses in the completion design of deep offshore heavy oil reservoirs. As production of heavy and viscous oil moves through the wellbore dynamic transfer of heat occurs between the produced fluids and the surroundings. For a deep offshore reservoir this challenge needs to be properly addressed. Simulations were performed to evaluate these challenges based on the impact that they generate on the flow rate artificial lift injection rate hydraulic fluid circulation rate tubing size and the

C18 LOW SALINITY OIL RECOVERY – THE ROLE OF RESERVOIR CONDITION COREFLOODS Abstract 1 There is much published data in the literature showing that waterflood recovery is dependent on the composition especially the salinity of the injection brine. These data however have all been generated at conditions which are not representative of the reservoir and therefore it has not been demonstrated that these potential EOR benefits are applicable to real reservoir situations. Reservoir condition coreflood studies using live crude oil and brine were therefore performed on a number of different reservoir systems to determine whether the recovery benefits seen in

C20 LINKED POLYMER SOLUTIONS FOR IMPROVED OIL RECOVERY BY WATERFLOODING Abstract 1 MORTEN G. AARRA MAGNY BJØRSVIK HARALD HØILAND TORE SKODVIN DAG STANDNES AND ARNE SKAUGE Centre for Integrated Petroleum Research CIPR University of Bergen Bergen Norway Polymer gel treatments have been widely used to improve sweep efficiency or to reduce production of unwanted water. In this study we have focused on identifying systems for in-depth mobility control to increase sweep efficiency during water flooding. The systems are sometimes referred to as linked polymer systems (LPS) or colloidal dispersion gels (CDG). LPS can be a useful EOR method for oil

C22 GEL TREATMENT OF INJECTORS –THEORY AND PRACTICE Abstract 1 FEDOROV K.M. (TYUMEN STATE UNIVERSITY) PAVLOV N.E. (RNTC LUKOIL-WEST SIBERIA) ANDREEV V.E. (BASHKIRIAN ACADEMY OF SCIENCES) Semakova st. 10 Tyumen 625003 RUSSIA Gel treatment of producers and injectors is a common field operation for waterflood conformance improvement in West Siberia. The purpose of the method application is flow diverting in a reservoir stratification and sweep improvement. The method is usually applied on the last stage of field development when water breakthrough leads to the high watercut in the production fluid. The analysis of field practice of the Urai department of

C24 WATER SHUTOFF USING OIL-SOLUBLE CHEMICALS – AN X-RAY CT STUDY Abstract 1 Koenraad Elewaut and Pacelli L.J. Zitha Mijnbouwstraat 120 2628 RX Delft The Netherlands [email protected] We investigate the modification of porous media properties for reducing water production in oil wells using a novel chemical which is soluble in oil without any chemical reactions but when brought in contact water reacts and forms a stable gel. This oil-soluble chemical (OSC) is deemed capable of reducing considerably the risk of damaging oil bearing layers during bullhead water control treatments. We present an experimental study of the emplacement of the OSC