This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Introduction to the Formation Damage”.
1. What is Formation damage?
a) Impairment of the permeability
b) Increased production
c) Reduced viscosity
d) Increased viscosity
View Answer
Explanation: Any reduction in the inherent productivity of the well is known as Formation damage. It is the undesirable impairment of the permeability of petroleum-bearing formations by various adverse unexpected processes e.g. due to drilling, workover fluids.
2. Flow restrictions in the tubing or those imposed by the well or the completion geometry are also considered to be the formation damage.
a) True
b) False
View Answer
Explanation: The statement is False. The corrected statement is Flow restrictions in the tubing or those imposed by the well or the completion geometry is not considered to be the formation damage. Because they are formation independent.
3. In general, formation rocks are oil wet in nature.
a) True
b) False
View Answer
Explanation: The statement is false. The corrected statement is in most of the cases, formation rocks are water wet nature and this is favorable otherwise oil extraction would be a tougher job than as it is now.
4. Which of the following statement is correct regarding formation damage?
a) Formation damage can’t occur by drilling fluid
b) Productivity Index is the ratio of Flow rate by draw-down
c) Workover fluid can’t damage the formation
d) Flow efficiency is the ratio of ideal drawdown by actual drawdown
View Answer
Explanation: The correct statement is the Productivity Index is the ratio of Flow rate by draw-down. The other corrected statements are Formation damage can occur by drilling fluid, workover fluid and the Flow efficiency is the ratio of actual drawdown by ideal drawdown.
5. Which of the following statement is incorrect regarding formation damage?
a) Formation damage is the reduction of the natural inherent productivity of the well
b) Workover fluid, drilling fluid can occur formation damage
c) Productivity Index is the ratio of Flow rate by draw-down
d) Permeability of the formation remains unaffected by the formation damage
View Answer
Explanation: The incorrect statement is Permeability of the formation remains unaffected by the formation damage. The corrected statement is Permeability of the formation may get affected by the formation damage. Workover fluid, drilling fluid can occur formation damage. Formation damage is defined as the reduction of the natural inherent productivity of the well.
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