Chapter 1_Introduction to EOR.pptx

Introduction to Enhanced Oil Recovery (EOR) Content 1. 2. 3. 4. 5. 6. What?? Why?? How??? of EOR IOR and EOR definition EOR Basic Principles How is work??? How oil are trapped? Recovery Mechanism in residual oil Why EOR? • Continue global energy demand – fossil fuel still a major supplier • Exi...

Introduction to Enhanced Oil Recovery (EOR) Content 1. 2. 3. 4. 5. 6. What?? Why?? How??? of EOR IOR and EOR definition EOR Basic Principles How is work??? How oil are trapped? Recovery Mechanism in residual oil Why EOR? • Continue global energy demand – fossil fuel still a major supplier • Existing oil fields are maturing • Less and less new discoveries of ‘giant’ fields • About half of the oil in place is still unrecoverable by the conventional methods EOR – The Future EOR a Choice EOR- The Choice… • Improved Oil Recovery (IOR) – EOR • • • • Marginal Field Development Deep water Development Exploration / new Discoveries Non-Conventional oil ? SKP 5333 – Sesi 2008/09-01 Water Flooding Water Flooding After Water Flooding – What’s Next IOR or EOR IOR or EOR IOR Definition and Process I OR Definition & Processes IOR Production Enhancement Infill/Step-out drilling Secondary Recovery Enhanced Oil Recovery Gas flooding - CO2 Optimizing artificial lift Recompletion Water flooding Increasing well stimulation Workover Reactivating idle wells Infill drilling Changing completion strategy Step-out drilling Microbial (MEOR) Deepening Dilute surfactant/chemical Gas flooding (immiscible) Gas flooding - Hydrocarbon rich gas Water alternating gas (WAG) Debottlenecking facilities Polymer Upgrading facilities Thermal SPE IIORC, Oct ‘03 Slide 6 EOR Lake, L. W,(1989) EOR of the reservoir fluid system. from dti (1993) EOR (definition) EOR (definition) EOR (definition) IOR (definition) Improved Recovery Technique IOR/EOR Key Parameters EOR – Basic Principles EOR How –ItsHow Workits work? Action on Sweep Efficiency at the Macroscopic Scale By increasing thewater viscosity By decreasing theoil viscosity By usinga miscible displacing Action on Displacement Efficiency at thePoreScale By reducing theinterfacial tension By action on the rock wettability Polymer flooding Steam drive In situ combustion CO2 flooding MicsibleHC flooding Surfactant flooding Alkalineflooding How oil trapped? 1 • Low Sweep efficiency 2 • Low displacement efficiency Low sweep efficiency Low sweep efficiency Low displacement efficiency How Water Displaces Oil What IF the medium is oil wet? Basic Water-Oil/Rock Properties How viscous is the oil? Mobility Ratio (macro) Capillary Number (micro) Residual Oil vs Capillary Number Residual Oil vs Capillary Number