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Oil well cement must above all

  • A.be as fine as it is physically possible to grind
  • B.contain a very large proportion of added gypsum
  • C.remain workable at high temperature and pressure
  • D.set within a very few seconds of being mixed

Answer: C

It is pumped a great distance down a hot borehole and must not stiffen on the way. Retarders are used to control the thickening time under those conditions. A premature set would leave the casing uncemented and the well unusable.

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