Petroleum Production Operations Practice Test 7

1. How does reduced absolute permeability results in the formation damage mechanism?

Results due to a decrease in gas saturation

Results from plugging of pore channels by induced or inherent particles

Results from an increase in water saturation or oil wetting of the rock

Results due to a decrease in water saturation

2. What is Formation damage?

Reduced viscosity

Impairment of the permeability

Increased viscosity

Increased production

3. Which of the following is correct in the context of gravel - sand size ratio when the uniformity coefficient is less than 5; consider flow velocity is less than 0.05 ft/sec?

D₁₀ gravel = 6 times D₁₀ sand size

D₁₀ gravel = 4 times D₁₀ sand size

D₁₀ gravel = 8 times D₁₀ sand size

D₁₀ gravel = 7 times D₁₀ sand size

4. What is wettability alteration in the context of formation damage?

Cause of formation damage mostly caused by anaerobic bacteria

Cause of formation damage mostly caused by the conversion of rock from water-wet to oil-wet

Oil wet rock is very helpful

Oil wet rocks are always favorable for the production of oil and gas

5. What is the use of Shape Memory Polymers in the oil and gas upstream industry?

Packer disintegration

Oil control

Sand control

Gas control

6. The minimum (possible most negative) skin factor is obtained when the apparent wellbore radius equals to drainage radius.

False

True

7. What is the formula for calculating the pressure drop as shown in the diagram below?

ΔP_s=141.2kh/qμBs

ΔP_s=141.2qμBs/kh

ΔP_s=161.2qμBs/kh

ΔP_s=161.2kh/qμBs

8. Which of the following is correct regarding the precipitation of the solid in formation damage?

Incompatibility of the treating fluid is the reason for precipitation in many cases

Incompatibility of the packer used is the reason for precipitation in many cases

Solids can’t be precipitated within the formation

Asphaltene and paraffin can never get precipitated

9. Which of the following statement is correct regarding formation damage?

Formation damage can’t occur by drilling fluid

Workover fluid can’t damage the formation

Productivity Index is the ratio of Flow rate by draw-down

Flow efficiency is the ratio of ideal drawdown by actual drawdown

10. What is the pressure range within which resin coated gravel without screens is generally be used?

>1000 psi

2500-3300 psi

3300- 4500 psi

<1000 psi