Objectif The software to be validated is the ITCR (IFE Tracer Reseasch Cooperation) module for modelling tracer flow in reservoirs. Tracers play an important role in mapping fluid flow and remaining oil and gas saturation. In this respect, it is crucial to possess a reliable modelling tool predicting tracer response curves, especially in the case of the recently developed partioning tracers. The project aims to validate and demonstrate the superiority (over conventional tracer options in standard commercial simulators) of the ITRC tracer module for use in field scale reservoir tracer simulation projects. In particular, the field cases to be studied for testing and validation of its performance should result in improved reservoir description and flow pattern of the Gullfaks field and a better description of the efficiency of the WAG pilot process in the Snorre field. The capabilities of the module will be demonstrated by coupling it to black oil (Eclipse) and Compositional (CMG) simulators.L%The field tracer data and core samples have been at the forefront of experimental and computational techniques for the structural and flow properties characterisation of a variety of porous materials (from micro- to macro-pores). Participation to collaborative projects (BRITE-EURAM, JOULE) has contributed to the development of expertise and the acquisition of modern characterisation facilities.Assuming that tracers do not affect the flow of other fluids in the reservoir, the calculation of tracer flow may be performed in a module separated from the rest of the reservoir simulator. At each timestep of the reservoir simulator, the tracer module needs flow parameters such as grid block pressures, phase velocities and saturations to be transferred from the host simulator. The advantage of such an implementation is to use the available options for predicting reservoir fluid flow together with advanced numerical methods for the tracer flow calculation. To be able to resolve the influence of reservoir heterogeneities, faults, existence of 3 phase zones, degree of oil-gas contact in miscible IOR processes, etc., it is necessary to use partitioning tracers and accurate numerical methods for solving the respective tracer flow equations. This is especially important when narrow tracer slugs are injected in the reservoir.The module is capable of handling several tracers simultaneously. Water tracers, oil tracers and gas tracers may be injected. Each tracer may adsorb to the surface of the reservoir rock and the tracer concentration in the reservoir fluids is in equilibrium with the amount of adsorbed tracer. Equilibrium constants (K-values) are assumed relating the tracer concentration in each fluid phase. A water or gas tracer with non-zero K-value to the oil is called a partitioning tracer. The tracer pulses may be subjected to dispersion and molecular diffusion while propagating through a reservoir. In the tracer module, a full tensor dispersion option has been implemented. The dispersion coefficients are calculated using innovative upscaling methods applied on reconstructed porous media obtained from core data. In order to reduce numerical dispersion (e.g smearing of the tracer pulse), the module uses an explicit integration scheme for the convection part of the tracer equation and an implicit one for the dispersion/diffusion part. Moreover, a 2nd order numerical integration scheme has been implemented. This scheme in conjunction with separate grid refinement for the tracer equation represents a powerful tool for accurate prediction of tracer flow. The tracer software is made on a modular basis so as to be coupled to the main commercial reservoir simulators. Champ scientifique natural sciencescomputer and information sciencessoftwarenatural sciencesmathematicsapplied mathematicsnumerical analysis Programme(s) FP4-NNE-THERMIE C - Specific programme for research and technological development, including demonstration in the field of non-nuclear energy, 1994-1998 Thème(s) 1 - OIL AND GAS Appel à propositions Data not available Régime de financement DEM - Demonstration contracts Coordinateur NATIONAL CENTRE FOR SCIENT. RESEARCH (NCSR) Contribution de l’UE Aucune donnée Adresse POB 60228 AG. PARASKEVI 15310 Attikis Grèce Voir sur la carte Coût total Aucune donnée
