Before a cement job, cement system compositions are carefully designed in the laboratory at a given anticipated slurry density; however, during the job, significant density errors or fluctuations can occur, and the properties of the resulting cement system may differ dramatically from those observed in the laboratory. For this reason, the accuracy and precision of cement mixing in the field have been topics of concern for many years. In this paper, the design and operation of a newly developed computerized vortex cement mixing system, which provides excellent density control, is described. In addition, case histories are presented which demonstrate the accuracy and precision of the mixing system, and the successful transfer of laboratory cement system performance to the wellsite.

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