Drilling and cementing in the Madden Deep Unit of west central Wyoming is characterized by formation pressure variances, gas influx and lost circulation problems. These problems must be considered when designing cement slurries for each casing and liner job. Consideration must also be given to the fact that large volumes of cement are required for these jobs.

To maximize the success of each cement job, extensive laboratory pre-testing and field blend testing are conducted prior to moving cement to location. This procedure consists of designing and testing a cement slurry to meet such parameters as thickening time, fluid loss control, compressive strength development and hydrostatic pressures. This pre-testing is followed by testing each load of field cement blend to detect any deviations from the pilot cement.

This paper will discuss such aspects of the field blend testing as bulk plant sampling, acceptable thickening time windows, test repeatability, and the use of dry additive identification. A major point will show how the use of dry additive identification is a very valuable and time saving tool in the testing of field blends.

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