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Unformatted text preview: 4 – Advanced Reservoir Engineering
Assignment # 1 Solutions – Winter 2011
Part F
The formula for a real gas is: In order for a the ideal gas formula to be used for the real gas formula, the Z factor must be close to 1 or
must be close to 0. Therefore the following range is suggested: 10 ENGI 9114 – Advanced Reservoir Engineering
Assignment # 1 Solutions – Winter 2011 Question 3
What we know: Circular cross section of bowl shaped reservoir. Plot of reservoir is provided:
70 60 Height (m) 50 40 30 20 10 0
1200 1000 800 600 400 200 0 200 400 600 800 distance (m) The base line
represents the oil water contact
Porosity of rock increase upwards, represented by
The water saturation as a function of h is
Net to gross
Formation volume factor
is Solution gas oil ration is Part A
The formula for STOIIP is: Taking out the constant and breaking the reservoir up into 11 slices of constant thickness : 1000 1200 ENGI 9114 – Advanced Reservoir Engineering
Assignment # 1 Solutions – Winter 2011
This is most easily solved in excel. Choose a thickness of slices to evaluate, say 6 m. Then evaluate the
properties in the centre of the slice
. Note that
is obtained by reading from the
plot provided. For the total STOOIP, simply sum up the STOIIP calculated at each layer. An example is
provided below: FVF NTG ∆h h Slice Thickness Height hi (m) Φ(hi) Sw(h) xi
STOOIP/layer
1.450 0.9 6 0
6
3 0.183 0.917 1169
242285
12
9 0.189 0.764 1106
637357
1...
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 Winter '11
 DrJohansen

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