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  • The importance of accurate temperature testing for cementing


    J. Bradley and J. Langlinais

    Bottomhole circulating temperature (BHCT) is an important consideration for all cementing jobs, but becomes critical when designing low-volume, low-rate liner jobs. As the BHCT increases, more retarder can be required to ensure that the cement remains fluid until placed. When cementing small liners (i.e., 7-in. OD and smaller) with low volumes and low rates, the total pumping time is comparatively short. The slurry may not have enough time to cool to the BHCT indicated on the API Liner Schedule, yet design and testing are routinely conducted only at the temperatures established in this schedule. Analyses performed with proprietary drilling engineering software present a different picture of BHCT conditions when cementing low-volume, low-rate liner jobs. The specifications and results for four liner jobs in the US Gulf Coast region provide insight into the impact of accurate BHCT values when determining the optimal job design.

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