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Oil well cement retarders are needed because

  • A.the cement slurry is always pumped down at a very low temperature indeed
  • B.the slurry is required to set within a very few minutes
  • C.the well is invariably drilled under cold surface conditions
  • D.temperature and pressure increase with depth and accelerate setting

Answer: D

Conditions several kilometres down would set an unretarded slurry long before it reached its destination. The retarder is matched to the measured downhole temperature rather than chosen by habit. Every well is designed against its own measured conditions.

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