Create a new input file ‘TwoPhase’ (using ‘New Simulation Wizard’) to simulate the performance of a two-phase oil and water reservoir of dimensions 2400ft x 1600ft x 120ft, using field units, which has 3 layers of the same thickness

Create a new input file ‘TwoPhase’ (using ‘New Simulation Wizard’) to simulate the performance of a two-phase oil and water reservoir of dimensions 2400ft x 1600ft x 120ft, using field units, which has 3 layers of the same thickness

SOEE2560 Reservoir Simulation 1

Practical 3
Two-Phase Simulations

To be submitted by Thursday 27th March 2014, 2 pm
Submission online through the VLE (VLE/ SOEE5745/‘submission’)

Create a directory called ‘Practical3’ in your home directory. Save all the files/figures required
in the exercises in this directory. Create a word document ‘Practical3_sol.doc’, where you will
save the solutions/figures to the exercises.
Notes:
 For all the tasks for which you need to show figures, you can save a graph/3D plot by
using: click right/Print/to JPG file, and you save it in your directory. Then you will show
these figures in your practical solution (in Practical3_sol.doc), writing an appropriate
caption for each figure.
 The choice of units used in the graphs that you plot is of your own unless the exercise
requires a particular unit (e.g. ‘plot time in days’).

Exercise 1 [55%]
Create a new input file ‘TwoPhase’ (using ‘New Simulation Wizard’) to simulate the
performance of a two-phase oil and water reservoir of dimensions 2400ft x 1600ft x 120ft, using
field units, which has 3 layers of the same thickness. The grid should have 30 cells in the x-direction, and 20 cells in the y-direction. The file should contain the following data:
Depth of reservoir top: 6000 ft
Rock Compressibility: 3.5E-06 1/psi
Kx: 500mD in the top layer; 1000mD in the middle layer; 1400mD for the bottom layer.
Ky: 300mD in the top layer; 550mD in the middle layer; 950mD for the bottom layer
Kz: 60mD in the top layer; 120mD in the middle layer; 200mD for the bottom layer

Porosity: 0.19
Initial pressure at 6040ft: 4230psia
The simulation should start on 1st Jan 2000 and should run until 1st Jan 2011.

–*Water Properties:
–* densSTP(lb/ft3) densRef(lb/ft3) comp(1/psi) pRef(psi) visc(cp)
WATR
68.72 64.95 3E-06 14.7000 0.35032

2

–* Oil PVT Table
–* P(psi) Bo(rb/stb) Visc(cp) Rs(Mscf/stb) Comp(1/psi) dVisc(1/psi)
OPVT
4230.00 1.2 0.65 0.00000 8.0e-06 0.00000

The input file should have three vertical wells, namely: two injector wells- one injector WINJ1
in the centre of cell (2,10) and one injector WINJ2 in the centre of cell (29,10), and one
producer well in the centre of cell (15,10).
The two injectors WINJ1 and WINJ2 should be perforated in all three layers, each with a radius
of 0.25ft, and WINJ1 should inject water at the rate of 4000stb water/day, while WINJ2 should
inject water at the rate of 4200stb water/day. The bottom hole pressure in the injectors cannot
exceed 18,000psia.
The producer WPRD should be perforated in the bottom two layers, has a radius of 0.25ft,
should produce at a liquid production rate of 3800stb liquid/day (keyword for liquid production
rate: LPT) and it should have a minimum bottom hole pressure limit of 2200psia.
Run the simulation ‘TwoPhase’ using Tempest. Go to the ‘Results’ section.

a)Plot the 3D grid. Create a figure in which the 3D grid with all wells with their perforation
intervals is visible, together with the axes. Save this as ‘Figure 1’, and show this figure in
your practical solution.
b)Show in your coursework the part of the Tempest text file defining the two wells trajectory
(keyword TTAB) and well completions and targets (keyword ETAB).
c) The term ‘water cut’ indicates the ratio of the volume of water produced compared to the
the volume of total liquids produced in a reservoir.
Plot the water cut (WWCT) for all 3 wells (in %) versus time (in days) on the same graph, in
Figure 2, and show this figure in your practical solution. How can you explain this graph?
What will be the maximum water cut of the producer well?
d) Look at the grid cell oil phase saturation at various time steps. Plot the oil phase saturation
distribution, with the cell outlines, at the end of the simulation, in Figure 3, and show this
figure in your practical solution. Explain this oil phase saturation distribution (a few
sentences).
e) Plot in Figure 4 the oil production total for the producer well, and the liquid production total
for the producer well (and show this figure in your practical solution). How can you explain
this graph?

3

Exercise 2 [45%]
Save the input file ‘TwoPhase’ as a new input file ‘TwoPhase2’. This new input file will have
the permeabilities of the layers 1 and 3 in ‘TwoPhase’ swapped, such that:
Kx: 1400mD in the top layer; 1000mD in the middle layer; 500mD for the bottom layer.
Ky: 950mD in the top layer; 550mD in the middle layer; 300mD for the bottom layer
Kz: 200mD in the top layer; 120mD in the middle layer; 60mD for the bottom layer
The rest of the parameters should stay the same.
i) Run ‘TwoPhase2’ using Tempest, and then plot the following figures:
1. Figure 5: the oil production rate (in Mstb) for both runs (TwoPhase and TwoPhase2)
versus time (and show this figure in your practical solution). How can you explain
this graph? (a few sentences)
2. The water phase saturation distribution (with the cell outlines) at the end of the
simulation, for TwoPhase in Figure 6, and for TwoPhase2 in Figure 7 and show
these figures in your practical solution. How do you explain the differences between
the two figures? (a few sentences)
ii) In which case can the water injection be considered to be more efficient during the
simulation run time: in TwoPhase or in TwoPhase2? Justify your answer.

ANSWER.

PAPER DETAILS
Academic LevelCollege (1-2 years: Freshmen, Sophomore)
Subject AreaEngineering
Paper Type Research Paper
Number of Pages2 Page(s)/1100 words
Sources0
Paper FormatMLA
SpacingSingle spaced
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