2001

Eclipse exercise adapted from Heriot-Watt University Reservoir Simulation modulePAB3053 RESERVOIR MODELING AND SIMULATION (3D 2 - Phase)

ECLIPSE TUTORIAL- 1

PAB3053 RESERVOIR MODELING AND SIMULATION

PROJECT 1 (10%)

(3D 2-Phase)

APrepare an input data file for simulating the performance of a two-phase (water/oil) reservoir. The model will have a regular shape, with two wells at opposite corners to simulate production in a quarter five-spot pattern.

GRIDDING ANDROCKDATA (GRID)

The 3D section of reservoir being modelled has dimensions 2500' x 2500' x 150', and it is divided into three layers of equal thickness. The number of cells in the x and y directions are 5 and 5 respectively. Other relevant data are given below, using field units throughout:

Depth of reservoir top:8000 ftPorosity:0.20

Layer 1Layer 2Layer 3Permeability in x direction:200 mD1000 mD200 mDPermeability in y direction:150 mD800 mD150 mD Permeability in z direction:25 mD100 mD25 mD

Figure 1: Schematic of model.

FLUID PVT AND FLUID-ROCK INTERACTION PROPERTIES (PROPS)

Water and Oil Relative Permeability and Capillary Pressure FunctionsWater Saturation krwkroPcow (psi)-- table 1 for 1000mD0.15*0.00.94.00.450.20.30.80.680.40.10.20.80.550.00.1

-- table 2 for 200mD 0.25*0.00.99.0 0.50.20.31.8 0.70.40.10.45 0.8 0.550.00.22* Initial saturation throughoutlayer.

Water PVT Data at Reservoir Pressure and Temperature

PressureBwcww(psia)(rb/stb)(psi-1)(cp)45001.023.0E-060.8

Oil PVT Data, Bubble Point Pressure (Pb) = 300 psia

PressureBoViscosity(psia)(rb/stb)(cp)3001.201.08001.151.160001.102.0

Rock compressibility at 4500 psia:4E-06 psi-1Oil density at surface conditions:49 lbs/cfWater density at surface conditions:63 lbs/cf

INITIAL CONDITIONS (SOLUTION)

Initial pressure at 8075':4500 psia

The oil-water contact is below the reservoir (8,500 ft), with zero capillary pressure at the contact.

WELLS AND PRODUCTION SCHEDULE (SCHEDULE)

Drill two wells:producer PROD, belonging to group G1, in Block No. (1, 1)injector INJ, belonging to group G2, in Block No. (5, 5)

The inside diameter of the wells is 8".Perforate both the producer and the injector in all three layers.The datum depth for pressure measurements during production is 8,000 ft i.e. the pressure gauge is located just above the top of the completion.

Produce at the gross rate of 10,000 stb liquid/day with a minimum bottom hole pressure limit of 2,000 psia

Inject 11,000 stb water/day with a maximum bottom hole pressure limit of 6,000 psia.

Start the simulation on 1 Jun 2015, and use 10 time steps of 200 days each.

OUTPUT (SUMMARY, GRID & SCHEDULE)

Ask the program to output the following data:

Initial permeability, porosity and depth data (keyword INIT in GRID section)

Initial grid block pressures and water saturations into a RESTART file (keyword RPTRST in SOLUTION section set BASIC=2 to give basic dynamic output at t = 0)

Field Average Pressure(FPR)Bottom Hole Pressure for both wells(WBHP)Field Oil Production Rate(FOPR)Field Water Production Rate(FWPR)Total Field Oil Production(FOPT)Total Field Water Production(FWPT)Well Water Cut for PROD(WWCT)CPU usage(TCPU)to a separate Excel readable file (using keyword EXCEL) in the SUMMARY section.

Grid block pressures and water saturations into RESTART files at each report step of the simulation (keyword RPTRST in SCHEDULE section again set BASIC=2 to give basic dynamic output at each TSTEP)

PROCEDURE

1Edit file TUT1A.DATA in folder \eclipse\tut1 by opening it in Notepad, fill in the necessary data, and save the file. (Make sure the file ending is .DATA and not .txt)

2 Activate the ECLIPSE Launcher from the Desktop or the Start menu.

3 Run ECLIPSE and use the TUT1A dataset.

4When the simulation has finished, use ECLIPSE Office -> Results and menu File -> Open -> SUMMARY -> All Vectors, or use MS Excel to open the output file TUT1A.RSM, which will be in the \eclipse\tut1 folder.

5Plot the BHP of both wells (WBHP) vs. time and the field average pressure (FPR) vs. time on Figure 1.

6Plot the water cut (WWCT) of the well PROD and the field oil production rate (FOPR) vs. time on Figure 2.

7Plot on Figure 3 the BHP values for the first 10 days in the range 3,500 psia to 5,500 psia.

8 Run Floviz to display the grid cell oil saturations

4