BACKGROUND

In well site drilling operations, formations can be encountered that contain caverns or zones that are so large that a well can go into total loss. Due to the sheer volume of the cavern or zone, the loss rate can be so severe that it is difficult to keep the well filled. The amount of mud required to fill the cavernous formation can result in significant logistical and financial challenges. Alternatively, there can be a risk of gas migration and major well control issues. In severe events, the cost, time, and safety issues can result in the requirement to plug the wellbore and disconnect from the drilling assembly.

