Change In The Temperature Of The Return Drilling

The temperature will normally take a sharp increase in transition zones. The circulating rate, elapsed time since tripping and mud volume will influence flowline temperature trends.

The temperature gradient in abnormally pressured formations is generally higher than normal. The temperature gradient decreases before penetrating the interface and, therefore marked differences can give and early indication of abnormal pressures. This is usually a surface measurement which has a tendency to be influenced by operating factors. Figure 3.2 shows plots of temperature increase while penetrating an abnormal pressure formation.


Figure 3.2 Flowline Temperature Data

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