Underbalanced coiled tubing drilling (UBCTD) has been utilized more frequently in recent years and can provide significant economic benefits when applied in the proper field setting. UBCTD requires a comprehensive evaluation of the proposed application, a commitment of resources by the operator and service providers, and a clear understanding of, (and tolerance to), the learning curve. As established coiled tubing drilling operations continue to push the technical limit forward, advances are assured.

The main scope of this paper is to document a template or flowchart for putting together a UBCTD project, covering everything from initial concept up to drilling the first well.

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