Combined UBD and drilling with casing lends innovation to unique conditions ///

A unique combination of underbalanced drilling and drilling with casing has proved to be successful in drilling wells that feature stratified pressure regimes in mature fields, including CO2. The combination of two innovative technologies, Underbalanced Drilling (UBD) and rotary drilling with casing, has proved to be a viable solution to successfully drilling a well with varying stratified pressure regimes, including CO2, in a mature field. A project to prove this innovation had the following objectives: • Minimize drilling-induced formation damage to maximize injection capabilities • Minimize induced losses, thus differential sticking • Improve drilling efficiencies by reducing flat time caused, NPT, well conditioning, drillstring tripping and casing running operations. The case study described in this article shows how a gas injection well overcame the challenges of conventional drilling approaches that were potentially costly and challenging from a well control perspective, due to lost circulation and the resultant formation influxes.

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