Simple Fractured Reservoir Screening Tool

1. Simple Fractured Reservoir Screening Tool If you answer “Yes” to any of these questions, you may have a Fractured Reservoir • Do well test or whole core permeabilities exceed typical porosity- permeability relationship by an order of magnitude? • Do some wells in the field experience water influx much earlier than others? • Are well rates extremely variable across the field? • Do injected fluids show up earlier or in different wells than expected? • Are flow rates after casing and perforating substantially lower than open hole tests? • Do your drilling wells experience unexpected high mud losses or unintended variable drilling rates? • Do your wells experience rapid decline in rates? Simple Screening Tool

2. Fractured Reservoir Screening Tool

3. Fractured Reservoir Screening Tool

4. Fractured Reservoir Screening Tool

5. Fractured Reservoir Screening Tool

6. Cores Borehole Image Logs 2-D Seismic Core Analysis (Plug, Whole Core/3-D Whole Core) Structural/Fracture Modeling Single & Multiple Well Tests Tracer Tests 3-D Seismic History Matching Reservoir Simulations Directional Permeability Data Water Breakthrough 4-D Seismic Drainage Area Calculations (Access, Production, Harvest) Data Types Useful in Fractured Reservoir Analyses

7. Procedures When “Discovered” During1) Exploration/Access • Obtain cores and/or image logs in all early wells • Predict natural fracture distributions • Select optimum well locations and well paths • Determine and map in situ stress from breakouts, etc.. • Determine fractured reservoir type • Evaluate reserves, variability, and risk

8. Procedures When “Discovered” During2) Primary Recovery/Production • Plan static data collection wells • Perform multiple well tests • Model fracture system and in situ stress and correlate with dynamic data • Determine directional permeability vectors • Correlate fracture directions, in situ stress, and directional permeability • Refine reservoir simulations using fractures

9. Procedures When “Discovered” During3) Secondary Recovery/Harvest • Re-evaluate flood patterns • Evaluate water production in terms of fractures • Model in situ stress across the field • Infer characteristics of the fracture system from dynamic data • Re-evaluate reservoir simulations to include fracture anisotropy • Revise predicted recovery factor (down)