This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Cement Additives”.
1. At 48°F Class A cement requires 48 hrs to reach a compressive strength of 500 psi. What does it mean?
a) The WOC is 500 psi
b) The WOC is 48 hrs
c) The WOC is 48°F
d) The WOC is 24 hrs
View Answer
Explanation: The WOC (Wait on Cement) is 48 hrs. WOC is the time requires for the cement to achieve a compressive strength of 500 psi. WOC plays an important role in the oil and gas industry while cementing is done down the hole behind the casing in the unconsolidated formation to give strength to the casing.
2. Densified cement slurries (using a friction reducer) have faster strength build up.
a) True
b) False
View Answer
Explanation: Yes, Densified cement slurries (using a friction reducer) have faster strength build up. Because When the cement is Densified and has friction reducer in it then it will have less water content and certainly will have faster build up.
3. Sodium Chloride in low concentration accelerates the cement setting.
a) True
b) False
View Answer
Explanation: Yes, Sodium Chloride in low concentration accelerates the cement setting but at higher concentration, it acts as a retarder. 2 to 2.5 wt% of Sodium Chloride in cement produces optimum acceleration.
4. Cal-Seal is a high-strength controlled setting _____
a) Gypsum Cement
b) Portland Cement
c) Gypsum+ Portland cement
d) Permafrost Cement
View Answer
Explanation: Cal-Seal is a high-strength controlled setting Gypsum Cement. Most of the time Cal-Seal cement is used in the 50-50 ratio with the Portland cement to increase its durability.
5. What type of retarder is Calcium Lignosulfonate (HR means Halliburton retarder)?
a) HR-4 lignin type
b) HR-20 gypsum type
c) HR-13 gypsum type
d) HR- 6L lignox type
View Answer
Explanation: The HR-4 lignin type retarder is Calcium Lignosulfonate. It is used for static temperatures from 260 to 290°F. It should not be used with high bentonite cement because it doesn’t act as a dispersant.
6. Which of the following is not suitable weighting material?
a) Hematite Ore
b) Barite
c) Ottawa Sand
d) Bentonite
View Answer
Explanation: The suitable weighting materials are Hematite Ore, Barite and Ottawa Sand. Hematite has a specific gravity of 5.05 and Barite has sp. The gravity of 4.2 and sand has sp. The gravity of 2.65.
Sanfoundry Global Education & Learning Series – Petroleum Production Operations.
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