Hydrating lost-circulation squeeze resolves issues in deep HPHT gas pay zone

04/26/2004
Canadian Natural Resources Ltd. controlled losses and a significant H2S kick in a deep well using a new dual-action lost-circulation material. CNRL experienced severe losses while drilling through a high-pressure, deep gas pay zone in the foothills of west-central Alberta. Reducing the drilling-fluid density slowed the rate of losses; however, the decrease in hydrostatic pressure led to a gas influx from the same formation.Conditions were further complicated by the presence of H2S in dangerous concentrations. Several types of commonly used lost-circulation material (LCM) were pumped downhole in an attempt to control the losses.As an alternative to commonly used LCM, the operator decided t...
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