This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Basic Causes of Formation Damage”.
1. Contact with the foreign fluid is the basis cause of formation damage.
a) True
b) False
View Answer
Explanation: The statement is true. Contact with the foreign fluid is the basis cause of formation damage. The foreign fluids may be drilling fluid, workover fluid or any other type of treating fluids used.
2. The reservoir fluid can’t damage the formation even if the original characteristics are altered.
a) True
b) False
View Answer
Explanation: The statement is false. The corrected statement is that the reservoir fluid can also damage the formation if the characteristics of the formation fluids are altered. In a solution gas drive, as the reservoir fluid pressure drops below the bubble point pressure, a gas phase is formed reducing the relative permeability of the oil phase.
3. Which of the following is correct regarding the precipitation of the solid in formation damage?
a) Solids can’t be precipitated within the formation
b) Incompatibility of the treating fluid is the reason for precipitation in many cases
c) Asphaltene and paraffin can never get precipitated
d) Incompatibility of the packer used is the reason for precipitation in many cases
View Answer
Explanation: The correct statement is Incompatibility of the treating fluid is the reason for precipitation in many cases. Solids can also be precipitated within the formation. Asphaltene and paraffin can get precipitated due to the change in equilibrium conditions.
4. What is Bacterial Plugging in the context of formation damage?
a) Bacterial Plugging is very helpful
b) Type of formation damage mostly caused by aerobic bacteria
c) Cause of formation damage mostly caused by anaerobic bacteria
d) Bacterial Plugging is always favorable for the production of oil and gas
View Answer
Explanation: Bacterial Plugging is the cause of formation damage and is mostly caused by anaerobic bacteria. These types of bacteria are ubiquitously present in and around oil and gas wells. In some cases, injection of water-based fluids can increase the growth of microbial bacteria’s populations and can result in significant declines in injectivity or productivity.
5. What is wettability alteration in the context of formation damage?
a) Cause of formation damage mostly caused by anaerobic bacteria
b) Oil wet rock is very helpful
c) Oil wet rocks are always favorable for the production of oil and gas
d) Cause of formation damage mostly caused by the conversion of rock from water-wet to oil-wet
View Answer
Explanation: The wettability alteration in the context of formation damage is the cause of formation damage mostly caused by the conversion of rock from water-wet to oil-wet. Corrosion inhibitors and dispersants etc may alter the wettability.
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