Objetivo The aim of the FOLKA project is to investigate some problems related to waterflooding and gas injections in low permeable chalk reservoirs.The project includes 4 phases:- Planning and preliminary studies- Gas injection miscibility conditions- Chalk wettability conditions- Reservoir modelling, field studiesThe FOLKA project includes a laboratory program using samples from Danish and Norwegian chalk reservoirs. The laboratory program is carried out by IKU in Trondheim.Minimum Miscible Pressure was determined experimentally and theoretically for Danish and Norwegian oil reservoirs.MMP was above reservoir pressure for lean hydrocarbon gas and nitrogen. For carbon dioxide the MMP was below reservoir pressure. This was confirmed by core displacement tests.PHASE 1 : PLANNING AND PRELIMINARY STUDIESSelection of reservoir for fluid sampling and core sampling. Preparation of fluid PVT report.PHASE 2 : GAS/OIL PHASE BEHAVIOURPhase behaviour was studied in a visual saphire cell at reservoir conditions.Slim tube tests were carried out using lean hydrocarbon gas as the displacing fluid.Minimum Miscible Pressure (MMP) was determined at 45 MPa. This is about two times reservoir pressure. MMP was checked by correlations.PHASE 3 : CORE DISPLACEMENT TESTSTHREE GAS TYPES WERE USED AS DISPLACING hree gas types were used as displacing fluid- lean hydrocarbon gas- nitrogen- carbon dioxide.Lean hydrocarbon gas and nitrogen are assumed to displace the oil through partial miscibility, whereas carbon dioxide results in a full miscible displacement process. This assumption was confirmed by the oil recovery in the three tests.PHASE 4 : NUMERICAL SIMULATIONS- The compositional PVT package, COPEC, was used to verify the oil characterization. The reservoir simulator, CERES, which includes the COPEC fluid model was used to simulate the slimtube displacement tests.Good correlation between experimental and calculated MMP-values was obtained. Programa(s) ENG-HYDROCARB 1C - Programme (EEC) of Community projects in the hydrocarbons sector, 1973-1985 Tema(s) 1.5 - IMPROVED OIL RECOVERY Convocatoria de propuestas Data not available Régimen de financiación DEM - Demonstration contracts Coordinador COWICONSULT CONSULTING ENGINEERS AND PLANNERS Aportación de la UE Sin datos Dirección PARALLELVEJ 15 2800 Lyngby Dinamarca Ver en el mapa Coste total Sin datos
