Quiz on the Well Test Theory

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Well Test Theory – are you ready ?

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So piece of cake ?
Otherwise time to relax, put your feet on your desk and watch a movie…

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Question 1 of 10
1. Question
Why do we use pseudo-pressure for gas wells in particular ?
- to linearize the flowing equations
- because total compressibility depends on pressure.
- just to make well test analysis more difficult and complex.
- we could use pressure or pseudo-pressure for gas wells, it doesn’t matter.
Correct
Incorrect
Question 2 of 10
2. Question
What about with depletion? Any issue for gas wells in particular, with significant changes in reservoir pressure?
- Gas density changes with pressure, so we need to use pseudo-pressure with material balance correction with strong depletion.
- With significant depletion, gas viscosity and total compressibility change, so we need to use pseudo-pressure with material balance correction.
- We need to use a gas PVT model based on gas composition and with wide range of pressure values.
- Everything is taken care of with the use of pseudo-pressure, no worries.
Correct
Incorrect
Question 3 of 10
3. Question
Are the drawdown and PBU responses equivalent ?
- What is a drawdown?
- It depends: sometimes yes, sometimes no.
- Yes, always.
- No, never. One the well is flowing and the other one the well is shut-in.
Correct
Yes it depends. Drawdown and PBU are equivalent under some assumptions.
Incorrect
The correct answer is that it depends. Drawdown and PBU are equivalent under some assumptions.
Question 4 of 10
4. Question
What are the assumptions when analyzing a shut-in period ?
(multiple answers)
- Short shut-in duration compared to production time
- The flow period in particular before the PBU reaches and ends in radial flow regime
- Superposition works
- The user watched the “Well Test Theory and Practice” training video and knows well test analysis.
Correct
Well done.
(You could have had an extra point though, if you had also selected number 4…)
Incorrect
Strictly speaking, the first three answers are correct.
(If you selected number 4, you secretly got an extra point…)
Question 5 of 10
5. Question
Why are we always talking about the superposition time?
- This is the function that we use all the time to derive any pressure, from initial drawdown and PBU to any PBU.
- We are plotting the derivative plot versus the superposition plot.
- We use this complex time function to derive the conventional derivative for any PBU.
- It makes us feel important to talk about superposition time.
Correct
It is not important to know the definition of the superposition time function, but why we use it.
Incorrect
It is not important to know the definition of the superposition time function, but why we use it.
Question 6 of 10
6. Question
What could a negative slope on the derivative mean ?
(multiple answers)
- 3 dimensional flow (or spherical flow) around the wellbore (not a good news).
- Decrease in KH away from the well (composite behaviour).
- Improvement in mobility KH/u away from the well (composite behaviour).
- This may be an erroneous feature due to wellbore phase redistribution.
Correct
Well done!
Incorrect
There are 3 possible answers to this question.
Question 7 of 10
7. Question
Looking at the derivative plot below, what type of well and reservoir could that be ?
(multiple answers)
(click on the plot to enlarge)
- Well with wellbore storage and skin in a reservoir with an increase in mobility further away from the well.
- Well with wellbore storage and skin in a reservoir with a decrease in KH further away from the well.
- Well with wellbore storage and skin in a multi-layer reservoir with a reservoir crossflow from a low permeability zone.
- Is this well horizontal?
Correct
Incorrect
Question 8 of 10
8. Question
Do we derive pressure or ∆P to obtain the derivative plot ?
- definitely ∆P.
- Maybe the pressure.
- Does it matter ? It is the same result.
- When you say ∆P, which ∆P are you talking about ?
Correct
Incorrect
It doesn’t matter whether we derive PBU pressure or ∆P, it is the same.
Question 9 of 10
9. Question
Which tool do we generally use to drive our well test analysis?
- The data plot showing pressure and rate versus time
- The superposition plot
- The DP plot
- The derivative
Correct
Incorrect
Question 10 of 10
10. Question
Ok a difficult one for the end. Looking at the plot below, what type of well and reservoir could that be?
(multiple answers)
(click on the plot to enlarge)
- Well with wellbore storage and skin in a reservoir with an increase in mobility further away from the well.
- Fractured well in a reservoir with an increase in mobility further away from the well.
- Fractured well with a limited frac height. (partial penetration frac)
- Fractured well in a reservoir with a decrease in KH further away from the well.
Correct
Incorrect

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