Page 300 - Introduction to Petroleum Engineering

288 RESERVOIR PERFORMANCE
14.4 A reservoir flow model is a dynamic model.

14.5 History matching calibrates the reservoir flow model.
14.6 A reservoir flow model should not be used in the reservoir management
process if a field has no production history.

14.7 Depletion of the Wilmington Field caused subsidence in the Long Beach area.
14.8 History matching is an essential part of green field flow modeling.
14.9 A realization is one representation of reservoir geology.
14.10 From a business perspective, the objectives of a reservoir model study should
yield a solution to an economically important problem.

14.6.3 Exercises

14.1 A grid block in a reservoir flow model is 275 ft wide in the x‐direction, is
275 ft wide in the y‐direction, and has a gross thickness of 20 ft. What is the
bulk volume of the grid block in cubic feet?
14.2 A. Suppose a well is completed in a grid block with the following prop‑
erties: length = width = 100 ft, net thickness = 15 ft, and porosity = 0.25.
What is the pore volume of the grid block in reservoir barrels? Note:
1 bbl = 5.6146 ft .
3
B. If the well is producing 500 RB/day of fluid, what percentage of the grid
block pore volume is being produced each day?
14.3 A. A reservoir is 10 mi. long and 6 mi. wide. Define a grid with
Δx = Δy = 1/10 mi. What is the number of grid blocks needed to cover the
areal extent of the reservoir?
B. If five model layers are used, what is the total number of grid blocks in
the model?
14.4 A. If initial oil saturation is 0.7, residual oil saturation is 0.25, and pore
volume is 961 800 RB in a grid block, what is the volume of mobile oil
in the grid block? Express your answer in RB.
B. If a well produces 500 RB oil/day from the block, how long does it take
to produce all of the mobile oil in the grid block?

14.5 A. A geologic model is built using a grid with 300 blocks in the x‐direction
and 400 blocks in the y‐direction based on seismic areal resolution and
35 blocks in the z‐direction based on well log analysis. How many grid
blocks are in the static geologic model?
B. A flow model is upscaled from the geologic model using a grid with 150
blocks in the x‐direction, 200 blocks in the y‐direction, and 10 blocks in
the z‐direction. How many grid blocks are in the dynamic flow model?