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ECLIPSE Blackoil Reservoir Simulation
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Exercise 1: Single Well Coning Model
Purpose:
Edit the RUNSPEC section
Use the PRT file for identifying errors
Compare several radial models in ECLIPSE office
Reservoir synopsis:
Radial model
Saturated Oil with dissolved & free gasWell cones gas after ~100 days production
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GRF File
What is a GRF file?
A text file that contains crossplot specifications
Where do I get one?
ECLIPSE Office: Set up the crossplots you want, write out a
GRF for future use
By editing an old GRF fileGRF File
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Exercise 2: SNARK RUNSPEC Section
Purpose:
Create a RUNSPEC section from scratch.
Field SNARK:
Grid Dimensions - 24 x 25 x 12
Oil field initially undersaturated (above bubble point).Aquifer support suspected (we will use a Fetkovich aquifer).
Production from 1 January 1998.
5 producers. Up to 2 wells may be drilled in the future.
Request unified input and output files. Use Field Units.
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Exercise 3: SNARK GRID Section
Purpose:
Specify reservoir geometry & basic rock
properties.Data:
Porosity and Permeability obtained from
wells drilled throughout reservoir (table).Kz/Kx = 0.1
Corner point geometry created
previously in Petrel - SNARK.GRDECLRequest the following output:
EGRID and INIT file
Transmissibility and NNCs to PRT file
0.1726212
0.18287110.1833510
0.182919
0.193348
0.193337
0.171916
0.172575
0.172504
0.06293
0.172442
0.172311
PoroKx, Ky
mDLayer
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Ex 4: SNARK - PROPS & REGIONS Sections
Purpose:
Supply and verify reservoir fluid PVT properties
Supply and verify relative permeability & capillary pressure data
Define distinct reservoir regions
Relevant Data:
Surface Densities (lb/ft3) Oil 42.28; Water 62.43; Gas 0.0971.
Bw is 1.013 rb/stb at 3118 psia, w is 0.4 cP and Cw 2.74x10-6 (psi)-1
Cris 2.8x10-6 (psia)-1 at P
iPVT and Saturation Tables are supplied in PROPS_Data.xlsspreadsheet
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Exercise 5: SNARK - Initialization
Purpose:
Supply initial conditions & define the
aquifer
Data:
Bubble point pressure is 1062.2 psia,
GOR is 973 scf/stb.
Oil-Water Contact: 8200 ft (free
water level)
Pressure: 3035.7 psia at 7000 ft
Aquifer support: Volume 1x107 stb;
PI 5 bbl/day/psi
Aquifer connetions
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Exercise 6: SNARK - History Match
Purpose:
Adjust properties to match measured production
Well data:
All wells have an internal diameter of 0.625 feet and skin of 7.5.
Well production history is in HIST.SCH file
WEST
CENTER
CENTER
CENTER
CENTER
Group
10186PRODUCER
212117PROD4
921616PROD3
101207PROD2
121813PROD1
K2K1JI
PerforationWell HeadWell Name
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Exercise 6: SNARK History Match (cont)
Process
Complete SNARK dataset by supplying well definitions andproduction history
Run sensitivities on
Fault Transmissibility
Aquifer Volume and Deliverability (Productivity Index)
Complete history match for Pressure(Optional) Use Oil Rate control and match water production
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Exercise 7: SNARK Recovery Optimization
Purpose:
Create restart run
Use various group production / injection controls to optimize recovery
Process:
Create restart run with current production ratesCompare with group production control
Compare constant water injection to voidage replacement and
production balancingInvestigate gas reinjection