Data Mining & Oil-Field Modeling Y.Chang

Outline Background Reservoir Simulation Modeling Examples and Projects

Geology

Oil and Gas Reservoir

Porosity Porosity = pore-volume / bulk-volume –a measure of the void spaces in a material

Porosity Distribution

Darcy’s Law –describes the flow of a fluid through a porous medium Permeability –a measure of the ability of a material (such as rocks) to transmit fluids Darcy’s Law

Phase Diagram

Saturation A measure of the fluid spaces in pores, e.g., Oil saturation = oil-volume / pore-volume

Petroleum Reservoir Modeling

Reservoir Modeling Process Well Data: Core, Logs Seismic Data Fluid Data Rock Data Upscalling Simulation Model Well Data + Oil/Gas/Water Production Geologic Model

Logs + Core Data Mohaghegh, 2000, SPE 58046

Logs + Seismic Data Mohaghegh, 2005, SPE AmplitudeNeutron porosity: Well 1 and 2

Examples and Projects: A Synthetic Reservoir Model

Permeability Model size: 24 x 25 x 15 Wells: 25 prodjcers 1 water injector

Permeability

Initial Oil Saturation

Oil Saturation (2 years) Initial So

Gas Saturaton (2 years) Initial Sg

Field Production Rates

Well-13 Production Rates

Well-15 Production Rates

Well-17 Production Rates

Forecast Oil Production

Forecast Oil Prod. – 2 nd year Data

Other History Match Examples Da Silva, et al., 2007, SPE Well PH-01 Results Production Data

Project 1: Estimate Field Oil Production Rate Data: oil rates vs. time –0 – 300 days: all wells at maximum rates –300 – 360 days: all wells at reduced rates of 100 b/d –360 – 3653 days: all wells at maximum rates Task: –Use 3-year data (0 to 1,096 days), estimate field production rates to 10 years. ?

Oil Saturation > 0.65 (6 years)

Gas Saturation < 0.15 (6 years)

In-fill Well? So>0.65, 6-year Sg<0.15, 6-year

Project 2: In-fill Well Location Data –Pore-volume map –Oil saturation map at the 6 th year –Well locations –Oil Volume = Pore-Volume x Oil-Saturation Task –Find a new well (I,j,k) location that can give highest initial oil production rate

Well Locations * * WATER INJECTION WELL * I J K WELL * * ALL PRODUCTION WELLS WELL …

Oil Saturation Maps OIL SATURATION DISTRIBUTION TIME: DAYS OR YEARS -- TIME STEP NO.: 50 J = 1 I = K P P P ……. J = 1 I = K P P P …….

Questions?