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  1. (PDF) underbalanced drilling and its advancements: an...
    www.researchgate.net

    Underbalanced drilling (UBD) technology can overcome a number of problems encountered during drilling, which is otherwise impossible with conventional overbalanced...

  2. (PDF) Underbalanced drilling technology
    www.researchgate.net

    Underbalanced technology, while still on a sharp growth curve, is finally becoming accepted as a normal method for handling the drilling and completion of wells.

  3. Underbalanced system helps drill North Sea chalk/sandstones
    www.researchgate.net

    The selected system bestmatching the criteria was a biopolymer-formate-based fluid



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