Managing wellbore temperatures may increase effective fracture gradients

09/06/2004
Drilling operations cause changes in wellbore temperatures that can significantly impact effective fracture gradients.For example, circulation on bottom usually produces bottomhole temperatures that are below the static geothermal temperature. The cooling reduces wellbore stresses and consequently produces lower effective fracture gradients that can result in costly lost-circulation events.Some of these adverse thermal effects can be managed by adjusting parameters of the drilling process such as mud properties and hydraulics. Thermal simulation modeling can help identify these parameters and assist in developing optimum thermal management systems.Lost-circulation eventsA recent examinati...
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