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  • Controlling pressure when drilling in high-pressure reservoirs


    R. A. Graham and P.J.C. Schermer

    Additional benefits of new technology occur when that technology finds application in other areas. Developments in underbalanced drilling technology have increased confidence in using new equipment and techniques for bottomhole circulating pressure (BHCP) control and hence, well control. This has prompted a terminology change from the well accepted "underbalanced drilling," or UBD, to a more encompassing term – "controlled-pressure drilling," or CPD. The latter reflects a broader use of UBD technology to effect well control from an underbalanced.

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