Presentation Slides - SPE WA

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1. Reservoir Simulation (cont)• Cell by cell equations give rise to massive sets ofnon linear equations• From a partial differential equation viewpoint:– Approximate set of non-liner equations– Linearised and iterated on per-timestep– These approximate equations are approximately solvedper time-step. ( surprised?)– Two errors ( 1 st discretisation error) and (2 nd – materialbalance error).CTSOR6 Pty of xx Ltd
Reservoir Simulation :Reservoir Simulation boils down toRepeated solution of large sparseMatrix systems. ( This is where >90% ofthe CPU is spentAx = bSometimes several per time-step.For structured grids:In 2D: 5 point stencil ( maybe 9)In 3D : 9 point stencil ( maybe 27)CTSOR 7 Pty of xxLtd
Page 1 and 2: Simulation ?Per K. CoatsCTSOR 1 Pty
Page 3 and 4: Preamble• JPT magazine 1980, 1991
Page 5: Practical Reservoir Simulation -DAT
Page 9 and 10: Grid Design is seldom Simple ……
Page 11 and 12: Shot across the bow:From Larry Lake
Page 13 and 14: Simulation Hardware ..... Have PC
Page 15 and 16: SYSTEM based models -> often make u
Page 17 and 18: Types of UsersTakeaway ( Personal S
Page 19 and 20: 4. Reservoir Simulation and Field d
Page 21 and 22: Example:Existing waterflood1. NFA -
Page 23 and 24: Sometimes - we stumble.Here is a li
Page 25 and 26: 4. Greenfield (cont)Greenfield cont
Page 27 and 28: 5. Reservoir SimulationPro’s• R
Page 29 and 30: 7. State of the Art• Uncertainty
Page 31 and 32: Reservoirs modelled at the 100’s
Page 33 and 34: Relative Permeability remains a poo
Page 35 and 36: Well known quote:Models are “fals
Page 37 and 38: CTSOR 37 Pty of xxLtd
Page 39 and 40: HM Difficulties with faults SPE 868
Page 41: Selected Reading1. Larry Lake. Mode

Presentation Slides - SPE WA

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