This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Well Testing – Transient Pressure Tests”.
1. For Pseudo- Steady state flow which of the following is correct in which P,t represents Pressure and time respectively?
a) dP/dt =0
b) dP/dt =constant
c) dP/dt =infinity
d) dP/dt =1
View Answer
Explanation: For Pseudo- Steady state flow partial derivative of pressure with respect to time is constant not zero i.e. mathematically dP/dt =constant. Pseudo- Steady state flow is also known as semi-steady-state flow and quasi-steady state flow.
2. What is the type of fluid flow state showing on the diagram below?
a) Steady state flow
b) Unsteady state flow
c) Semi-steady state flow
d) Vertical flow
View Answer
Explanation: The type of fluid flow state showing on the diagram is of Semi-steady sate flow which is also known as Pseudo- Steady state flow and quasi-steady state flow.
3. How can be the pressure drop across the skin is calculated (all signs have their original meanings)?
a) ΔPskin= 141.2qμBs/kh
b) ΔPskin=141.2qkh/μBs
c) ΔPskin=141.2qμks/Bh
d) ΔPskin=162.2qμBs/kh
View Answer
Explanation: The pressure drop across the ΔPskin is calculated by using the formula ΔPskin= 141.2qμBs/kh. Where ΔPskin is the pressure drop across the ΔPskin. B is the formation volume factor, μ is the viscosity, s is the dimensionless skin factor, k is the permeability and h is the height.
4. Damage Ratio is the inverse of the Flow efficiency.
a) True
b) False
View Answer
Explanation: Yes, Damage Ratio is the inverse of the Flow efficiency. Flow efficiency can be calculated by using the formula Damage Ratio=Jideal/Jactual. Where Jideal stands for productivity index under ideal conditions and Jactual stands for productivity index under actual condition.
5. Which of the following is Miller- Dyes- Hutchinson equation?
a) Pws = Pi – (162.6qμB/kh)* log((tp + Δt)/Δt)
b) Pws = Pi – (141.2qμB/kh)* log((tp + Δt)/Δt)
c) Pws = P1hr + (162.6qμB/kh).log(Δt)
d) Pws = P1hr + (141.2qμB/kh).log(Δt)
View Answer
Explanation: The Miller- Dyes- Hutchinson equation is Pws = P1hr + (162.6qμB/kh).log(Δt). MDH methods is usually easier to use. Hence, it is used frequently, but in the case of Drill Stem Testing, where the flow time magnitude is almost equal to the flow time, this method is not used. For that case we generally use the Horner’s plot.
6. Which of the following are not the benefits of the Pressure Drawdown test over the Pressure Build up test?
a) Production continues during the test period
b) Reservoir volume in communication with the wellbore can be estimated
c) Production continues during the test period as well as Reservoir volume in communication with the wellbore
d) Production ceases during the test period
View Answer
Explanation: The correct answer is Production ceases during the test period. The benefits of the Pressure Drawdown test over the Pressure Build up test are Production continues during the test period, Reservoir volume in communication with the wellbore can be estimated along with the formation damage and formation permeability.
Sanfoundry Global Education & Learning Series – Petroleum Production Operations.
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