Discussion
A well cement must remain pumpable for 3 hours. Testing shows a thickening time of 2 hours 40 minutes. What follows?
Answer: A
Correct answer: a retarder is needed or another class must be chosen
Two hours forty is less than the three hours required, so the slurry would begin to stiffen while still being pumped - which risks losing the well. The remedy is a retarder or a slower class of cement, and an accelerator would make matters very much worse.
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