Oil well cement, per the source, is engineered to remain mobile and then harden under approximate conditions of:
A{'text': 'About 50 degree C, 200 kg/cm-square', 'label': 'A'}
B{'text': 'About 175 degree C, 1300 kg/cm-square', 'label': 'B'}
C{'text': 'About 100 degree C, 600 kg/cm-square', 'label': 'C'}
D{'text': 'About 300 degree C, 2500 kg/cm-square', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'About 175 degree C, 1300 kg/cm-square', 'label': 'B'}
1. §1.8.6 reads: 'The cement slurry has to be pumped in position at considerable depth where the prevailing temperature may be 175 degree C, coupled with pressures upto 1300 kg/cm².'
2. Retarders such as starches, cellulose products or acids are added so the slurry remains pumpable long enough to fill the well.
_Source: IGNOU ET-522 Block-1 Unit-1 Cement, §1.8.6, p. 12_
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