Tag Archives: Underbalanced Drilling

Drilling Directional Wells Underbalanced The main justifications for drilling a directional well underbalanced are to (1) reduce drilling costs, and/or (2) improve productivity. The combination of horizontal/multilateral and UBD technology is a relatively new one, and which has been explored more in international fields (especially the Middle East), than in …

Coiled Tubing for Underbalanced Drilling Coiled tubing is ideally suited for drilling underbalanced. The continuous nature of the coiled tubing string and the exclusive use of a mud motor for drilling provides several advantages over conventional jointed pipe drilling for underbalanced applications: Drilling with a mud motor prevents the formation …

Snub Drilling Overview If very high formation pressures and uncontrollable loss of circulation are expected during underbalanced drilling, use of a snubbing or a coiled tubing (CT) unit may be necessary. This type of underbalanced drilling is known as snub drilling. Snub drilling should be considered for wells with: Very high …

This topic covers the underbalanced drilling method, which is defined as the practice of drilling a well with the wellbore fluid gradient less than the natural formation gradient. Besides minimizing lost circulation and increasing the penetration rate, this technique has a widely recognized benefit of minimizing the damage caused by …