Abstract
ABSTRACT Deformation of a borehole across a salt bed in the U.S. Gulf Coast was monitored in support of a well cementing design. The well was drilled using a drilling mud of 13.3 lb/gal density through a salt-anhydrite section situated at depths of 17560 to 17870 feet. With the mud in place, caliper runs were made to measure the change in borehole diameter with time. The mud density in the borehole was then increased subsequently and caliper runs repeated until no noticeable change in borehole diameter within a 30-hour duration was recorded. When the mud density was 17.3 lb/gal, the borehole finally stabilized. Induced stress around the borehole was calculated. A relationship between induced stress (or mud density) and change in borehole diameter was established. Optimum density of cement slurry for the well was obtained. Results of the caliper measurements, along with the field measurement procedures are presented.
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